This article is first because I firmly believe labor is the biggest challenge we face today, as well as for the next 10 years in controlled environment agriculture (CEA), and in commercial horticulture and general production agriculture.

Victor Loaiza Mejia posted the following on LinkedIn on August 10, 2023: 

“I disagree with your assessment of the lack of ‘grower or production leadership’. Traditionally the greenhouse industry has had a legacy program (like Ivy League College) that benefited growers that come from outside the NAFTA countries. The local younger generation of growers and operators need opportunities to grow into these positions. They need mentoring and support.

“My vision of protected agriculture is more regional (USA, Canada, Mexico) than only thinking about the USA. As you mentioned in the article, the growing surface has decreased in the US but has increased in Mexico for example. The oldest greenhouse companies operating in the US and Canada are now some of the largest tomato marketers in the USA, purchasing greenhouse produce in Mexico at a very large scale, without really having ‘skin in the game.’ I see this as a big entry barrier for new companies based in the USA.

“The opportunity for small greenhouse companies is to resist the push to buy the newest closed greenhouse and buy only the necessary technology and develop their local market. Creating Cooperatives style of relationships with other small growers might be beneficial.”

Well, Victor, yes. That’s really all I have to say. Yes, I agree. I should have and could have selected my words better, while also providing more details behind my statement. If I would have, you would have seen that we are saying almost the same thing.

Now that we officially agree, let’s break this conversation down into the realities that drive the factors you highlight.

Where did the head growers, production managers, and vice presidents of operations come from in the U.S. controlled environment agriculture industry?  

The U.S. greenhouse vegetable industry started in the early to mid 1980s. (The Canadian greenhouse industry started a few years prior, and the Mexican greenhouse industry began about 10 years later.) Initially, the industry was almost 100% focused on growing tomatoes. Much of the industry was built off importing not only Dutch greenhouse technology, but also Dutch growers who were equipped with the training and knowledge needed to operate this new technology.  

As years went on, the U.S. continued to attract growers from the Netherlands, as well as nearby areas such as the United Kingdom and Belgium, which also had well-established glasshouse industries. Many of these early immigrants were well experienced with some education. They were young males eager to make their mark on a new industry in a new world thought of as “the land of opportunity.”

Now these same individuals have been in our small industry for 30-40 years. They are getting close to retirement, but many still work. This is an important part of Victor’s criticism and if you compare it with the graph below, you see why they have aggressively held on to positions of power.  

The industry does not have enough companies that can pay them the money they want or to promote others into key positions, while protecting their own careers and those of their friends. (Nothing new here. This occurs in all industries. Normally, industries have more companies and the impact is not so drastic.)

What about the other skilled labor needed to profitably operate a greenhouse vegetable facility?

Greenhouses require lots of skilled labor to operate successfully, especially when the operations are anywhere from 10-200 acres. You need IPM managers, labor managers, assistant growers, junior growers, packhouse managers, logistics managers and more. The list goes on and on. 

So where did these people come from? In many or most cases, Mexico. In the 1990s, the largest vegetable greenhouses in the U.S. were in southwestern Texas and southeastern Arizona — a short drive from the U.S.-Mexico border. This attracted young, educated Mexican (again mainly) men to jobs that paid well, provided year-round employment (not always the case in agriculture) and opportunities to work in a highly technical field that showed promise for advancement.

Now fast forward 30 years. These guys are ready and prepared to take over, but there are not enough opportunities for everyone to be in charge. This also means that as new companies open, we have a lack of ongoing opportunities to attract talent and give individuals chances to grow and develop the skills needed to run smaller or more niche organizations.

A change in politics. A change in opportunities. H-2A.

Simultaneously, we have seen a shift in our ability to bring labor into the United States. U.S.-based agriculture businesses rely heavily on worker visa programs to bring in groups of individuals to work jobs not often desired by locally available workers. The H-2A program allows U.S. employers or U.S. agents who meet specific regulatory requirements to bring foreign nationals to the United States to fill temporary agricultural jobs. (The word “temporary” is key!)  But, this program and our attitude toward migrant workers has shifted significantly over the past 30 years.  

According to the USDA, “Hired farmworkers make up less than 1 percent of all U.S. wage and salary workers, but they play an essential role in U.S. agriculture. According to data from the 2017 Census of Agriculture, wages and salaries plus contract labor costs represented just 12 percent of production expenses for all farms, but 43 percent for greenhouse and nursery operations and 39 percent for fruit and tree nut operations.”

The tightening of our southern border means that we rely on the H-2A program more than ever.  According to a July 2023 article in NPR, “The number of guest worker visas issued each year has more than quadrupled over the past decade. But the program is rife with labor rights violations, and farmers who have come to depend on it don’t love it, either.”

As I stated before, U.S.-based greenhouse producers are competing directly with Canadian greenhouse growers, as well as Mexican greenhouse producers, for consumers’ wallets in produce aisles across the United States. This means, as the American portion of the greenhouse-grown industry, we need to be conscious of all costs (of which labor is a significant portion). It is safe to say that we have learned and can confirm that locally available labor is not as efficient as the labor we get through worker visa programs. 

Why is local labor not as efficient as our immigrant workforce?

I will not even attempt to answer this question. But, what I can report is that through interviews with major greenhouse tomato growing operations, it is estimated that you need 3-4 times the amount of local labor as you do immigrant, migrant or visa workers. (This number seems true regardless of pay and benefits, based on information we received from the recently announced bankrupt company AppHarvest.) 

Conversations with on-site labor managers makes me believe that one main reason this perception exists is because this talent pool is seen as an unskilled labor force. Labor managers all agree that is far from the truth. The truth is, many of these individuals are skilled based on experience gained at other farms. These skills make them eager to be employed based on “production output,” as they recognize that their production compensation will far out pace any hourly rate that they might be paid.

According to USDA statistics from October 2022, the H2A program has expanded since 2005. But has it expanded enough to keep up with the demand? Especially the demand of the controlled environment agriculture sector?  

Even if we could keep up with demand in the greenhouse (or vertical farm), these programs do not allow us to address the issue of finding talented operational managers with experience to run the facility based on the current glass ceilings that appear to be in place.

So questions around labor, management and leadership remain for the U.S.-based controlled environment agriculture industry. From finding the experienced staff needed to operate an efficient greenhouse to providing the most talented in that group the opportunity to advance and excel. 

And Victor, my response to your comment remains “yes.” Now my question back to you is, how will you and your contemporaries lead our industry in change?

Urban Ag News would love to hear from you.  Please let us know your thoughts and comments.

PhD instructors include Paul Fisher from University of Florida, Erik Runkle and Roberto Lopez from Michigan State University, Jim Faust from Clemson University, John Erwin from University of Maryland,
Jennifer Boldt and Kale Harbick from USDA-ARS, Charlie Hall from Texas A&M, as well as environmental control experts from Argus, Priva, and Wadsworth. This well-rounded team will help you select and operate climate control equipment and sensors for ideal crop growth.

The course runs from October 16 to November 10, 2023. The cost is $US265 per participant, with a 20% discount if you register 5 or more. All course material is completely online and available at any time of the day, and includes pre-recorded videos, an interactive discussion board with PhD professors and industry experts, and quizzes. Two new modules are activated each week during the course, for a total of 8 learning modules. Instruction is at your own pace and time within the 4 weeks of the course, with a typical time commitment of about 6 hours per week. Our courses are highly rated by participants with over 80% completion, and your resume will be enhanced with a customized certificate of completion from UF. Click here to register (http://hort.ifas.ufl.edu/training/).

For more information, go to http://hort.ifas.ufl.edu/training/, or contact Greenhouse Training, Environmental Horticulture, University of Florida, USA, Email: greenhousetraining@ifas.ufl.edu. The course is supported by the American Floral Endowment and the USDA-ARS Floriculture and Nursery Research Initiative.

OptimIA project members are sharing their indoor farm research findings with the controlled environment agriculture industry and the public through a variety of educational and informational outlets.

The indoor farm industry is very fluid right now with changes occurring on a weekly basis. New companies are starting, some are leaving the industry, while others continue to receive millions of investor dollars to expand their operations. While financial stability is a key factor in the sustainability of some of these businesses, the need for production- and economic-related information is crucial to profitably producing quality leafy greens crops. Those with the financial backing have been able to develop and implement their own technology to produce indoor crops. New indoor farm growers, existing operations with limited financial resources, and even large-scale farms already in operation continue to look for sound production- and economic-related information that they can apply to their businesses.

Improving the indoor farm industry

In 2015 when members of the OptimIA project team initially submitted a USDA Specialty Crop Research Initiative grant proposal for funding, the primary focus of their research was on the production of leafy greens in indoor farms, but the focal points were moderately diverse.

“We went through the proposal submission process for several years before USDA approved the grant for the OptimIA project,” said Erik Runkle, who is project director and a horticulture professor at Michigan State University. “The proposal that was finally approved was to study the aerial environment as well as economics for leafy greens grown indoors. The aerial environment refers to air circulation, humidity, carbon dioxide concentration, light and temperature.”

One of the major objectives of the OptimIA project was to focus on industry outreach.

“The outreach program objective was to engage with stakeholders in the indoor vertical farming community,” Runkle said. “Prior to submitting the proposal to USDA, the project team members worked with an industry advisory committee and stakeholders from the indoor farm community.”

OptimIA team member Chieri Kubota, who is a professor and director of Ohio Controlled Environment Agriculture Center (OHCEAC) at Ohio State University, said proposals submitted for USDA Specialty Crop Research Initiative (SCRI) grants usually require both a strong research and outreach focus.

“USDA SCRI-funded projects focus on problem solving to move a specific industry forward,” Kubota said. “Not only is the research important, but also implementation of research findings in the industry sector. This is basically outreach extension. The proposals cannot just focus on research alone. It is important to have strong outreach activities.”

Multiple outreach activities, educational materials

Even before the grant proposal was submitted to USDA, OptimIA team members had already begun interacting with members of the indoor farm industry.

“We had been engaging stakeholders as a sort of proposal activities,” Kubota said. “We started doing the Indoor Ag Science Café almost a year in advance of submitting the grant funding proposal. That way we were engaging our stakeholders trying to develop a community educational platform that was a main activity. Indoor farm growers and equipment manufacturers are the general target audience of the project’s research. Team members are also constantly answering questions from growers and venture capital companies regarding indoor vertical farms.”

The OptimIA website includes a variety of educational materials including Research Highlights articles , scientific research journal publications and trade magazine articles, including Urban Ag News.

The OptimIA team members have also shared information from their research at various scientific- and grower-focused industry conferences. In July several members shared their research findings at Cultivate’23 during an educational workshop on the Essentials of Hydroponics Production: A tHRIve Symposium.

Team members have also been developing online educational materials under OptimIA University, which include YouTube videos.

“We have posted several lectures with topics based on discussions among the project members,” Kubota said. “The concept of OptimIA University is free access to whoever wants to use the online materials. The grower sector is the targeted audience.

“Rather than offering courses for a fee, we decided to make the information available to everyone, including growers and other companies that want to use it to train their employees. It consists of YouTube video lectures with pdf slides and additional reading materials. The OptimIA University website is about half completed and there are other course lectures still pending.”

The OptimIA researchers also hold an annual invitation-only stakeholder meeting.

“The annual meetings are specifically for our advisory committee which gives team members an opportunity to share information about the research in progress and that has been recently completed,” Runkle said. “It’s also an opportunity for the committee members to provide feedback and guide future project activity.

“We also invite growers and company representatives who we have worked with in some capacity on research projects. This includes growers with whom we may have conducted research trials or representatives from companies that have provided us with equipment or supplies used in our research.”

Educating the public

Even though the primary focus of the OptimIA project outreach program is members of the indoor farm industry, the team members also extend their educational activities to the general public.

“OptimIA researchers at Ohio State participated in the COSI Science Festival organized by the Columbus Museum of Science and Industry,” Kubota said. “This is a community STEM educational event in which companies and scientists participate and showcase their technologies and science. It is held in May over multiple days. We participated as an OptimIA group. We showed how leafy greens can be produced using different hydroponic systems with LED lights. OptimIA team members at Michigan State University and at University of Arizona have also done similar STEM programs related to hydroponic crop production for the public.”

For more: Erik Runkle, Michigan State University, Department of Horticulture; runkleer@msu.edu; https://www.canr.msu.edu/people/dr_erik_runkle; https://www.canr.msu.edu/profiles/dr_erik_runkle/cell. Chieri Kubota, Ohio State University, Department of Horticulture and Crop Science; kubota.10@osu.edu; https://hcs.osu.edu/our-people/dr-chieri-kubota; https://ohceac.osu.edu/. OptimIA, https://www.scri-optimia.org/.

This article is property of Urban Ag News and was written by David Kuack, a freelance technical writer in Fort Worth, Texas.

Cannabis water use efficiency (WUE) refers to the amount of water a cannabis plant uses to produce a certain amount of biomass or yield. Supplemental light, such as artificial lighting in indoor cultivation, can have significant effects on a plant’s water use efficiency. 

Here’s how:

1. **Increased Photosynthesis:** Supplemental light, especially in indoor growing environments, can enhance photosynthesis in cannabis plants. When plants can capture more light energy, they can convert more carbon dioxide and water into sugars and other organic compounds. This increased photosynthetic activity can potentially lead to improved water use efficiency, as more water is used for productive processes.

2. **Transpiration and Stomatal Regulation:** Transpiration is the process by which water is released from a plant’s leaves through small openings called stomata. These openings also allow for the exchange of gasses, including carbon dioxide and oxygen. When more light is available, plants often open their stomata wider to take in more carbon dioxide, which can lead to increased water loss through transpiration. This could potentially decrease water use efficiency if not properly managed.

3. **Optimal Lighting Management:** To maximize water use efficiency under supplemental light, it’s important to manage light levels effectively. Providing the right amount of light for the growth stage of the cannabis plant can help maintain a balance between photosynthesis and transpiration. Using light intensity and duration strategies, growers can optimize the plant’s ability to produce energy while minimizing excessive water loss.

4. **Growing Medium and Watering Techniques:** The choice of growing medium (soil, coco coir, hydroponics, etc.) and the watering techniques employed can also influence cannabis water use efficiency. Proper substrate choice and irrigation practices can help regulate water availability to the plant roots, preventing both water stress and waterlogging — both of which can impact WUE.

5. **Genetics and Environmental Factors:** Cannabis cultivars vary in their response to light intensity and other environmental factors. Some strains may exhibit better water use efficiency under supplemental light compared to others. Additionally, environmental conditions such as temperature, humidity, and CO₂ levels can also influence water use efficiency.

To push these limits, Callado and Hernandez regulated and analyzed the quantity and demand of resources and plant growth factors on an ongoing basis. They added light and water-control and measuring capabilities to every plot in the greenhouse, in addition to measuring temperature and evapotranspiration. 

As shown in Figure 1, the cannabis crops were grown under four light levels using two Current dimmable fixtures per plot supplementing sunlight. The L1000 PPB lighting fixtures delivered uniform supplemental light intensities of 150, 300, 500, and 700 μmol m⁻² s⁻¹ for 18 hours, while the Daily Light Integral (DLI) from the sun and LEDs were on average around 18, 30, 40, and 52 mol m⁻² d^-1. However, they present preliminary results for the three highest light levels. 

Moreover, the fertigation system was triggered independently at each plot when the pots’ water container capacities were 80%. This maintained consistent water and nutrient levels in pots regardless of the crop growth rates. Finally, the water use was quantified with load cells (scales) under the plants.

The Results and Conclusions

It’s easy to conclude from known knowledge that the impact of supplemental light on cannabis water use efficiency can be complex and depends on various factors, including light intensity, duration, genetics, and environmental conditions. Proper management of these factors, along with optimized growing practices, can help improve water use efficiency in cannabis cultivation. 

As the cannabis industry continues to evolve, research and experimentation in this area will provide more insights into how to achieve the best water use efficiency outcomes.

The results from Callado and Hernandez suggest that increasing the light amount not only increases the number of branches or cuttings per plant but also could increase the water demand (Figure 2b) and water-use efficiency to produce cuttings (less water per cutting) (Figure 2b). 

In other words, plants grown under an average DLI of 30 mol m^-2 d^-1 for 21 days produced close to 29 cuttings per plant, while plants grown at 52 mol m^-2 d^-1 produced 47 cuttings per plant from new secondary branches. 

Furthermore, plants grown under 30 mol m^-2 d^-1 produced 2.5 cuttings per every liter of water, while plants grown under 52 mol m^-2 d^-1 produced 4.3 cuttings per the same liter of water. This means the crops were more efficient at transforming water into branches under higher light intensities.

So how does this impact commercial growers?

The current research highlights the ability of a cannabis crop to use higher light levels to increase yield and water-use efficiency (higher yield per liter of water). The water-use efficiency for cutting production went from 2.5 to 4.3 cuttings per liter of evapotranspirated water when growing plants under 30 versus 52 moles of light per day, respectively. This would mean that to produce 100 cuttings using 52 moles of light, growers needed 23 liters of water instead of 40 liters under 30 moles of light. 

Figure 1. The top-left picture shows the experimental layout and greenhouse with two L1000 PPB fixtures at each plot or light treatment area (12 plots in total). The top-right picture shows a plot sensor that measures light from the two LED fixtures and the sun. The bottom pictures and arrows represent typical cannabis flower and plant production cycles.

Figure 2 shows the number of secondary branches or cuttings (a) water use per plant, (b) water-use efficiency (branches or cuttings per liter of water) and (c) under three light levels (30, 40, and 52 mol m⁻²) using LED lighting in addition to the sunlight.

To see other research from Hernandez and Callado, please follow this link:  www.gecurrent.com/eu-en/inspiration/researching-the-impact-of-supplemental-lighting-on-cannabis-production

There will be keynote speeches on the latest technology and interdisciplinary research on PFALs and open discussions on business trends, needs for technology development and collaboration specific to PFALs, and future possibilities for social activities with key players such as PFAL operators actively involved internationally. Poster presentations, exhibitions, and sponsored lunch sessions will also be held at the venue, providing an opportunity for interaction and high-level networking among the world’s plant factory leaders and enthusiastic community.

The symposium will feature the keywords, including “Global trends, challenges, and prospects of plant factory business, large-scale strawberry plant factory, fully automated plant factory, improving light and other resource use efficiency in plant factories, plant phenotyping, plant factories with generative AI, next-generation nutrient solution management, breeding, space farms, plant-made pharmaceuticals and functional food, urban farm, plant factories for the circular economy, plant factories in the smart city.” These topics will be covered through open discussions and international collaboration at smart city Kashiwa-no-ha, and online, with a view to achieving “staying healthy simply by living.” The symposium will offer highly interactive sessions from various perspectives with leading international researchers and the hottest business leaders of the moment. 

Speakers/Panelists

Chieri Kubota Professor, the Department of Horticulture and Crop Science, The Ohio State University, U.S.

Leo Marcelis Professor and Head of Chair Group Horticulture and Product Physiology,　Wageningen University, The Netherlands

Hiroki Koga Co-founder and CEO, Oishii Farm, U.S.

Seishi Ninomiya Emeritus Professor, The University of Tokyo, Japan

Francesco Orsini Full Professor, the Department of Agricultural and Food Sciences (DISTAL), University of Bologna, Italy

Roel Janssen Chief Business Officer, Planet Farms, Italy

Eiji Goto Professor, Chiba University, Japan

Yoshiaki Kitaya Professor Emeritus and Director of R&D Center for the Plant Factory, Osaka Metropolitan University, Japan

Masayuki Hirafuji Project Professor, The University of Tokyo, Japan

Paul Gauthier Professor, Protected Cropping, The Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Australia

Katashi Kai General Manager, Shinnippou (808 factory), Japan

Nagateru Nozawa CEO, MIRAI CO., LTD, Japan

Eri Hayashi President, Japan Plant Factory Association

Click https://select-type.com/e/?id=DFQu2EcoBas&w_flg=1 for onsite registration
or https://select-type.com/e/?id=9USB5nqn1p4&w_flg=1 for online registration.

For more information, go to JPFA International Symposium on Plant Factory 2023, or contact the JPFA at symposium@npoplantfactory.org. 

Japan Plant Factory Association

The Japan Plant Factory Association, a nonprofit organization founded in 2010, is devoted to advancing the plant factory industry and controlled-environment agriculture in and outside Japan through academia-industry collaborations.

Its mission is to develop and disseminate sustainable plant factory systems in a bid to address issues concerning food, the environment, energy, and natural resources.

Activities range from research and development in collaboration with research institutes and industrial companies, technical and business support, planning and operation of human resource development programs to educate plant factory specialists, organizing onsite tours, and international projects, including public relations activities.

Facilities: 15 Plant factories and more on the Kashiwa-no-ha campus site

R&D projects by consortium members, applied research at facilities suitable for demonstration, collaboration with academia and industry

Website: https://npoplantfactory.org/en

[Ithaca, New York] – The Greenhouse Lighting and Systems Engineering (GLASE) consortium is thrilled to introduce Gretchen Schimelpfenig as their new Executive Director. With an impressive background in Civil Engineering and extensive experience in the controlled environment agriculture (CEA) industry, Gretchen brings a wealth of knowledge and passion to her new role.

Ms. Schimelpfenig’s educational journey includes an M.S. in Civil Engineering from Stanford University in 2014 and a B.S. in Architectural Engineering from the University of Wyoming in 2012. As a licensed Civil Professional Engineer in California and Vermont, she has demonstrated her commitment to innovation and sustainability.

At GLASE, Gretchen will spearhead collaborative efforts with academics and industry stakeholders to drive groundbreaking advancements in greenhouse technology and systems. Her primary focus will be on reducing the environmental impact and increasing the profitability of the CEA industry by pioneering and commercializing emerging solutions.

In addition to her role at GLASE, Gretchen currently serves as a senior engineer at Energy Resources Integration (ERI), where she assists greenhouse growers and indoor farmers across the country in implementing cost-effective energy management strategies to maximize efficiency. Her expertise in this field is further highlighted by her previous position as the Technical Director of Resource Innovation Institute (RII). As the author of RII’s Lighting, HVAC, and Facility Design & Construction Best Practices Guides for CEA in partnership with the U.S. Department of Agriculture, Gretchen has already made significant contributions to the industry.

“I firmly believe in a carbon-neutral and climate-smart future for controlled environment agriculture. High-performance systems are the key to increasing greenhouse energy productivity,” says Gretchen Schimelpfenig, PE.

As the new Executive Director, Gretchen Schimelpfenig will lead GLASE in forging new partnerships, creating opportunities for knowledge exchange, and driving the adoption of cutting-edge solutions across the industry. Joining GLASE as a member means becoming part of a visionary community dedicated to transforming the future of controlled environment agriculture.
To learn more about GLASE and how to become a member, visit www.glase.org.

About GLASE

The Greenhouse Lighting and Systems Engineering (GLASE) consortium is a public-private collaboration that stands at the forefront of LED systems engineering, plant photobiology and physiology, and greenhouse environmental controls. Committed to pioneering and commercializing breakthrough greenhouse technology, GLASE brings together a diverse range of stakeholders in the controlled environment agriculture industry. For more information, visit https://glase.org/membership/.

About ERI

Energy Resources Integration (ERI) is a clean energy consulting firm developing a sustainable future for our planet through cost-effective energy management. Since 2011, ERI’s team of professional engineers has supported over 20 utilities across 8 states and worked with hundreds of agricultural, industrial, and commercial businesses as an energy advisor to support and accomplish sustainability goals. ERI executes strategies for businesses to foster a clean energy future. For more information, visit https://www.eripacific.com/contact-us/.

More importantly, will consumers pay a higher price for controlled-environment-grown produce?

Over the last five years, leafy greens have been the “it” crop for indoor farm production. Most indoor farms have started with leafy greens, primarily lettuce, and have looked to expand their product offerings to include herbs, microgreens, strawberries and tomatoes.

The OptimIA project, which is funded by USDA, is studying the aerial production environment and economics for growing indoor leafy greens in vertical farms. While much of the research of this four-year project has focused on managing the environment for vertical farm production, the economics related to this production is a major objective of OptimIA researchers. Based on feedback from commercial vertical farm growers, one of the primary areas of research is to develop economic information, including costs, potential profits, and to conduct an economic analysis to determine the strategies to improve profitability based on that information.

OptimIA researchers at Michigan State University who are focused on the economic aspects of vertical farm production include: Simone Valle de Souza, an ag economics professor; Chris Peterson, an emeritus professor in the Department of Agricultural, Food, and Resource Economics; and PhD student Joseph Seong, who is developing his thesis on the economics of indoor agriculture.

“I was invited by the other OptimIA researchers to use mathematical models that take into consideration the biology and technical parameters to determine the potential revenues and costs,” Valle de Souza said. “My team of economists is looking to identify the economic tradeoffs from the implementation of multiple environmental factors that the other OptimIA researchers were optimizing or planned to optimize as part of the project. Our job is to identify the optimal parameters for profitability in controlled environment production. As part of the OptimIA project, we tackled two aspects of economic analysis: production and resource-use efficiency and consumer preferences.”

Maximizing profits

As part of the economic analysis, Valle de Souza considered the variable costs of labor, electricity, seed, substrates and packaging materials. Based on the information collected from commercial indoor farm growers, labor was the largest cost at 41 percent of total variable operating costs, followed by electricity at 29 percent, seed and substrates at 22 percent and packaging materials at 7 percent.

“We did a sensitivity analysis to determine what would happen to profits if wages increased,” Valle de Souza said. “We conducted a series of simulations and determined on average a 1 percent increase in wages would reduce profit per square meter for a day of production by 6 cents. A 1 percent increase in the price of electricity would reduce profits by 5 cents per square meter per day. The contribution margin to profit is normalized on a per square meter per day of production so that we can make comparisons.”

While many growers might look to lower variable costs to increase profitability, Valle de Souza found that increasing the price of lettuce could be the better way to go.

“A 1 percent increase in the price of a head lettuce could increase profits by 60 cents per square meter per day,” she said. “Our analysis showed a revenue maximizing strategy is superior to a cost minimizing strategy. Reducing variable costs could result in savings of 5-6 cents in profit. However, during simulation scenarios that we tried, a revenue maximizing strategy could proportionately increase profits 10 times more by as much as 60 cents.”

OptimIA economists determined a 1 percent increase in the price of a head of lettuce could increase profits by 60 cents per square meter per day. A 1 percent increase in wages would reduce profit by 6 cents per square meter a day. A 1 percent increase in the price of electricity would reduce profits by 5 cents per square meter per day. Graph courtesy of Simone Valle de Souza, Mich. St. Univ.

Optimal length of production

Another part of the analysis done by the OptimIA economic researchers was to estimate the optimum length of the lettuce production cycle.

“In terms of production cycle length, we compared the trade-off between costs from one extra production day and revenues from yield that could be achieved from one extra day of growth,” Valle de Souza said. “We tried to estimate how long growers could allow lettuce plants to grow to take advantage of the fast growth rate the plants experience at the end of a production cycle. Using estimates of plant growth and plant density under an optimized space usage defined by our OptimIA colleagues at the University of Arizona, we found that under specific environmental conditions, day 19 after transplant, or 33 days from seeding, was the ideal harvesting day.”

Even though maximum revenue could be achieved earlier, at day 15 after transplant, costs per day of growth were higher for shorter production cycles. The contribution margin to profit, which was estimated as the difference between revenue and costs in this partial budget analysis, was larger at 19 days after transplant. After 33 days, profit starts to decline because the speed of plant growth rate is not as fast as the increase in costs associated with growing.

“We have determined the economic results from space optimization, estimated optimal production cycle length under given conditions, and the economic results from alternate scenarios of light intensity, carbon dioxide concentration and temperature,” Valle de Souza said. “In collaboration with our OptimIA colleagues, we are now working on a final optimization model that will associate optimal profitability with resource-use efficiency.”

Opportunity to educate consumers

Another aspect of the OptimIA economics research looked at consumer behavior and preferences in regards to indoor farms and the crops they produce. Using a national survey, the researchers determined whether consumers are willing to buy lettuce produced in indoor farms and how much they would be willing to pay for the enhanced attributes of produce grown in indoor farms.

“The survey showed no consumers rejected the innovative technology being used by indoor farms,” Valle de Souza said. “There was a group of consumers who were very supportive of the technology and completely understood what an indoor farm is. Another group of consumers were engaged, but not very convinced of the technology. Another group was skeptical of the claims of indoor-farm-produced leafy greens and were less willing to consume them. This same group said they had no knowledge about indoor farms and how they work.

“There were no consumers who had knowledge about indoor farms and rejected the leafy greens grown in these operations. Some consumers are still cautious given their little understanding about how the production systems work.”

Based on the survey results, Valle de Souza said the indoor farm industry has an opportunity to educate consumers about its production technology.

“The indoor farm industry could promote information materials that explain the benefits of a fully controlled growth environment,” she said. “Growers could explain how this technology eliminates the use of pesticides, how it can improve crop quality attributes, along with the environmental benefits of significantly lower water consumption, reduced land use, and the ability to deliver fresh produce to consumers in urban areas.”

Consumer willingness to pay more

Consumers surveyed by OptimIA researchers indicated they were willing to pay a premium for lettuce with enhanced attributes.

“We tested for taste, freshness, nutrient levels and food safety,” Valle de Souza said. “Consumers were willing to pay a premium for these attributes, especially in urban areas.

“Rural dwellers usually have their own backyards in which they can grow vegetables. They are used to seeing vegetables growing in the soil using sunlight. Rural residents were not as convinced about the need for indoor farms to produce leafy greens. Another interesting survey result was that consumers, in general, are not very decided if they prefer produce grown in indoor farms, greenhouses or outdoors.”

For more: Simone Valle de Souza, Michigan State University, Department of Agricultural, Food, and Resource Economics; valledes@msu.edu; http://www.canr.msu.edu/people/simone_valle_de_souza.

OptimIA Ag Science Café #40: Consumer Varieties for Indoor Farm Produced Leafy Greens, https://www.scri-optimia.org/showcafe.php?ID=111156.

This article is property of Urban Ag News and was written by David Kuack, a freelance technical writer in Fort Worth, Texas.

Serge Boon (owner of Boon Greenhouse Consultancy) is in no way new to the challenges and ever-changing landscape of the commercial greenhouse industry.  Serge grew up in the Netherlands (the land of greenhouses.) He is a native of Westland, (one of the largest greenhouse regions in the world), he rode his bike past rows and rows of greenhouses every day, and has been working in them since the age of 12. He has held almost every job in the horticultural industry, from grower to researcher to upper management.  Along the way he has learned everything from technology to best growing practices. 

Boon Consultancy’s most valuable offering might be their ability to translate complicated technical jargon into easy-to-understand language, that can be shared with ambitious and intelligent newcomers to the industry that are looking to change their communities’ access to safe, fresh and healthy fresh produce.

“Higgins will strengthen our relationships with industry vendors and customers across the world of horticulture,” says Boon.  “His 25-year commitment to the industry and ultimately our clients will only help to ensure that our diverse list of clients continues to be successful in a quickly changing and always challenging fresh produce world.”

About Boon Greenhouse Consultancy:

Providing agricultural consulting services for both niche and major businesses in the horticulture industry, particularly in the modified seed industry by designing plans that help businesses thrive by developing efficient, effective procedures that will save time, money, and energy.  

About Christopher Higgins:

Mr. Higgins 25 years of horticulture industry experience spans the full gamut of the industry.  From supporting production greenhouse facilities to running his own businesses and hosting industry education events, his knowledge and network is vast.  You can learn more about Chris, his businesses and his work as an advisor for industry grants as well as nonprofits by visiting his LinkedIn page.

Grapes are an economically important commodity, supplying fresh, dried, and processed markets worldwide. Although grapes are not a crop you immediately consider a beneficiary of CEA technology, it may be possible to adapt field agriculture, putting in measures to circumvent climate change and disease. 

The last few years I’ve been attempting to grow my own grapevine indoors, so when Chris Higgins shared the main photo I felt excited to learn how they were using LED lights to help fruit mature on vines in California. 

Could CEA also work for my grapevines?

Scotland is not known for wine but with changing climates and carefully chosen hardy varieties it could provide some competition for our national drink. Success at home is just around the corner as I begin season three with my black Hamburg grape (Schiava Grossa) grafted on S04 rootstock. It’s hopeful too, as earlier than expected it is producing trusses. The learning curve is not as steep as you may think and the trick is to not give up with a fruitless vine. 

We will take a look at the growing environment, the diseases that can be encountered and the pests that need to be eliminated by controlling some of the processes. Then we will examine some real Californian vineyards and how they are adapting and integrating CEA technology to increase efficiency and yield, battling against ever changing climates and earlier than predicted seasonal frosts. 

Year 3 indoors black Hamburg (dessert grape)  in central Scotland

Wine has an important role in world trade

Grapes were one of the earliest fruits cultivated for use as a beverage, and statues in ancient Roman culture were often adorned with grapes and wine decanters. In fact, many of the production principles first developed in ancient Rome can be found in winemaking today. Wine is classed as a cultured beverage and body, flavor, aroma, keynotes and vintage all play a part in how we decide to consume it. Aside from commercial vineyards, many vines can be cultivated under glass. This can be a lean-to, a conservatory, a polytunnel or a glasshouse, it doesn’t really matter. Mine are grown in a conservatory with great levels of natural light and temperatures rising to 105°F which helps ripen the fruit. 

The global wine market was valued at USD 417.85 billion in 2020 and growth is expected to expand to 6.4% CAGR by 2028. According to a recent report Italy, France, and Spain were the top three producers of wine worldwide as of 2022. In the Americas, Chile has the leading share of exports, almost three times more than the USA and Canada. Changing consumer preferences are evident with demand for fresh fruit, looking for year-round availability and consumers more willing to pay more for imported out-of-season fresh grapes.

Growing and Grafting Vines

Choosing the right rootstock is vital to ensure a successful harvest since the parent vine, Vitis. vinifera does not provide adequate resistance against phylloxera Vastatrix, a deadly root infection caused by the aphid-like insect, Daktulosphaira vitifoliae (Fitch). Phylloxera weakens the vines causing root galls making it susceptible to fungal infections. It has plagued vineyards, decimating crops in California, and completely devastated vines planted on AXR1 type B rootstocks. It is estimated to have cost the industry $6 billion to uproot valuable mature vines and replant with vines grafted onto sturdier rootstocks. 

To overcome this disease, grapes are grown on rootstocks from a variety of Vitis species selected from native areas or hybrids that use native species to form new rootstocks. The most commonly used are Vitis rupestris, V. riparia, V. berlandieri, and V. champinii. A grafted vine consists of the scion which is seen above ground and the rootstock which provides the root system and lower trunk joined at the graft union (protected with wax like above). 

Image by Wine Folly

Pruning is an artform and traditional viticulture techniques require patience and skill passed down through generations. Below are a few training techniques used in viticulture but you can learn more by following Dan from apicaltexas with great videos on pruning techniques in the field. 

Developing the vineyard should factor the best rootstock suited for particular environmental conditions. Soil type, pest resistance, tolerance to drought, wetness, salinity, and lime must all be considered when siting a vineyard.

Most experts suggest loamy soil as the best type of soil for grape growing. A crumbly mix of sand, silt, and clay when blended with other soils in the right amounts offers the ideal soil type. This is because the clay in loam drains well but also contains moderate amounts of water and nutrients within the preferred pH range (pH 6.5-6.8). Sonoma and Napa Valley are both loam soil regions. 

Even though grapevines are considered relatively tolerant to water deficits, growth and yield can be reduced in drought-like conditions. Drought tolerant rootstocks enable the scion to grow and yield even when water supplies are limited, a desirable trait if irrigation is likely to cause waterlogging in heavy clay soil. Acidic soils are common in many viticultural growing regions, and liming is common-practice to increase soil pH. The salinity of irrigation water and rising water tables can also affect productivity in grapevines which can have a  detrimental effect on wine quality.

Rootstocks can have a pronounced influence on the mineral nutrition of the fruiting variety. Vigorous vines can deplete zinc levels while increasing the uptake of potassium with regular soil analysis crucial to produce the best fruit. 

While growing under cover may not suit large scale vineyards, certainly the early stages can be started off under greenhouse control much like blueberries. A drip irrigation system will work well to ensure a good source of minerals is available at the root base with free drainage. 

If you are planning to grow in containers, a half barrel size is more than adequate with a light multipurpose compost. There’s no doubt selection of soil can be tricky because the soil type needs to work for both the vine and the rootstock. Remember sandy soil seems to have an advantage in resistance to phylloxera.

Microclimates & Disease Prevention 

Year one begins with training the cordon or guyot from the rootstock to produce two dominant shoots. Year two and the tendrils will form without fruiting but it is not until year three that fruit trusses will become visible on most vines. These can then be trained as desired with supports. How vigorous the growth develops will hugely depend on whether it’s grown as scions or as dominant root stocks. 

Mildew, powdery (Erisyphe necator) and downy (Plasmopara viticola) mildew are the predominant diseases encountered in viticulture. These favor successive periods of hot and humid conditions. Suppression of grapevine powdery mildew is problematic with resistance built up to systemic fungicides. This can also lead to weakened vines and susceptibility to Botrytis (botrytis cinerea) another fungal disease which affects almost every part of the vine, usually caused by high humidity coupled with strong winds. Mitigation traditionally introduces better airflow through the truss and canopy, pinching out individual berries can assist, allowing for circulation to circumvent rot problems. New ideas using light treatments are being trialed at Cornell university and UV treatments applied once a week up to 200 J/m2 on Chardonnay vines have proven to reduce powdery and downy mildew conidia germination by almost 100% and 50% respectively. 

Image sourced from David M. Gadoury, Cornell.

LEDs have also been shown to boost yields. RB light encourages leaf growth and fruit maturation but little experimentation has been possible due to field positioning of grapes. Perhaps in the future we will see these autonomous tractors lighting up fields at night.

Frost damage

The French prevent early bud loss by using fire candles between vines. It’s a risky business balancing crop loss from frost with fire damage if not controlled. Water sprays are often employed to protect against frost damage by forming ice crystals around the buds during cold weather. 

Microclimates play a significant role in wine quality and cool ocean breezes inland result in thicker skins on the berries resulting in more color, tannin and concentration of flavor.

Field light spectrum can assist fruit bud development 

Improving knowledge of environmental triggers for bud burst in grapes can help to optimize plant productivity, especially in marginal climates. In particular, an improved knowledge of the physiology of bud burst is fundamental to enable better crop management.

The point where a quiescent axillary bud commences regrowth is governed by both metabolic and signaling functions, driven by light, energy, and oxygen availability. Several grapevine studies have investigated the influence of low-intensity light on shoot physiology, suggesting that it is adapted to a low-light environment. Removing the apex can result in axillary bud outgrowth, as can changes in light intensity and quality. Axillary bud outgrowth is regulated by signals from the apex, which contain several light quality and quantity sensing pigments. These phytochromes sense red and far-red light, while cryptochromes and phototropins are involved in the perception of blue light. Accumulating evidence supports the function of photoreceptors in blue light perception resulting in activation of photomorphogenic gene expression, stimulating bud outgrowth.

Field trials with inter-canopy LED lights in California. Reach out if you need advice, we are here to help. 

These photoreceptors regulate the expression of different transcription factors to coordinate light-dependent photomorphogenesis. 

An early indicator of the transition to bud burst is ‘sap-flow’ preceded by an increase in xylem pressure leading the an increase in auxin and sugars in the sap.

Applying light theory helps improve knowledge of the physiology of bud burst which is fundamental to better canopy and crop forecasting, as the timing and coordination of this event will influence flowering, fruitset, and ripening.

Indoor low intensity RB LED lights – in Scotland year 2 with no trusses but plenty of tendrils and good vine growth.

Pests

Leafhoppers, cochylis and Lobesia botrana are dreaded pests that cause considerable damage to grape crops. IPM plays an important role in scouting for early damage to prevent disease. Prevention by spraying crops with regulated fungicides helps limit damage.  

Micropropagation of new grape varieties 

Starting Clean

Fungal and viral infections have plagued vineyards particularly in California where in the 1980s the deadly root infection phylloxera returned, completely devastating vines planted on AXR1 rootstocks. 

Viruses reduce plant vigor and delay bud break, and can be transmitted through vegetative propagation. Rapid micropropagation techniques can produce clean, disease-free, and vigorous plant material in a shorter time period, compared to conventional propagation techniques. 

There are many reasons why breeding is important to the wine industry, and my friends at PCT wrote a neat article on why growing clean clones is one of the most efficient methods to scale grape plantlets. 

New growth from a nodal cutting of my black Hamburg in initiation MS media growing under different low intensity LED spectrums.

A number of micropropagation techniques can be employed to clone grapes. Meristem culture induced from nodal cuttings can help to eliminate endophytes and produce virus free clones like above. 

Sweet seedless grapes like cotton candy are produced via embryogenesis. Others like Selma Pete, a white grape, are grown for the raisin market. The power of breeding a particular variety for a select market can pay dividends. 

Health properties of grapes

Health properties of grapes and grape juice are well documented particularly the black varieties which have higher anthocyanin levels, with known anti-inflammatory properties. Grape juice is a great way to boost immune systems and stay healthy. What we do know for sure is that resveratrol is well absorbed in the body and offers some exciting anticancer properties. Probably best to consume through black grape juice if you are concerned about the alcohol content in wine. 

Turning grapes into wine 

‘The older the vine the better the wine’ is a common saying in the industry, meaning the skin to pulp ratio increases creating a more intense flavor. Vines can be anywhere from 20 years to 120 years old and still produce good quality fruit. Some growers also believe older vines with deep root systems are more efficient at transferring minerals. 

One thing’s for sure, there’s more science in wine making than you can shake a stick at! It’s chemistry without cooking. Even for hobbyists it’s a great pastime and relatively cheap to get started. As a student I was taught how to make wine in demijohns, it was a relatively simple process. Yeast varieties can also have a significant effect on alcohol production. My final year degree project was to establish the budding rate of Saccharomyces cerevisiae, the most common species of yeast in winemaking. Ah, that stirred tank fermenter with all those sensors, part biology, part engineering…..

Begin with good quality grapes and crush and press down hard until the bunches are smashed and the juice is released. For reds, ferment the juice, skins and seeds after removing stems. 

At least 5 gallons of white grape juice can make five gallons of wine. Pour the juice into a demijohn. White grape juice is green to start and as it oxidizes it will turn a brown color during fermentation. Add wine yeast at a comfortable room temperature. It will foam as it releases carbon dioxide within a day or two, which signals the start of the process. Use an airlock to keep oxygen out and allow the carbon dioxide produced by to escape. 

Red ‘must’ can be fermented in a large open container with just a towel, add wine yeast, and give it a good stir. It may begin to ferment in as little as 12 hours.

Red wines need to be stirred, at least twice per day when fermentation is going strong. You’ll see skin floating on the surface but just stir down regularly. Red wine should be around 80°F during fermentation. Test the sugar levels of the fermenting juice periodically with a basic hydrometer. It’s measured in degrees Brix, which equals sugar percentage will reduce to -2 Brix once fermentation is complete.

When the wine tastes like something you’d enjoy drinking, it’s time to bottle. Most white wines should mature after four to nine months whereas reds may take from six months to a year. You can learn more about winemaking from a course at Cornell or perhaps the ‘personality’ of wine from Jancis Robinson, an influential wine critic. Wine will benefit from a few weeks or months aging in the bottle, but who can wait that long? 

My top reds are Spanish and Italian and I’m partial to a Californian rose. Chris would not say no to anything from the Napa Valley. Slàinte Mhath. 

Janet Colston PhD is pharmacologist with an interest in growing ‘functional’ foods that have additional phytonutrients and display medicinal qualities that are beneficial to human health. She grows these using a range of techniques including plant tissue micropropagation and controlled environmental agriculture to ensure the highest quality control.

Unless otherwise stated all images are courtesy of The Functional Plant Company and property of Urban Ag News.

DANVILLE, VA–  The Controlled Environment Agriculture (CEA) Summit East is proud to announce its return on September 19-20, 2023 at the Institute for Advanced Learning and Research (IALR) in Danville, VA. Focused on convening the CEA industry and academia, the annual event is co-hosted by Indoor Ag-Con, the premier global gathering of the vertical farming/CEA sector, and the Virginia Tech-IALR CEA Innovation Center, a joint project between IALR and Virginia Tech’s School of Plant and Environmental Sciences and the Virginia Seafood Agricultural Research and Extension Center.  

Following the success of its debut edition in October 2022, which brought together more than 200 attendees from 28 states, the CEA Summit East will continue to foster connections and collaboration among growers, educators, scientists, extension specialists, suppliers, engineers, tech specialists, architect/developers, and other industry members.

“The enthusiasm and engagement we saw at our inaugural event were truly inspiring and we’re thrilled to continue our partnership with the CEA Innovation Center to bring the CEA Summit East back in 2023,” said Brian Sullivan, CEO, Indoor Ag-Con. “Both organizations see tremendous value in growing an event like this that brings business and academia audiences together at an incredible research facility setting that really fosters an environment for sharing ideas and new business opportunities.”

The two-day event will feature keynotes, panels and breakout conference sessions, as well as tabletop exhibits from industry-leading companies and research facility tours. Attendees can expect to learn about the latest advances in CEA and explore opportunities for collaboration and growth. 

“We are excited to build on the momentum of our first event and continue to bring together leaders in the CEA industry,” said Dr. Scott Lowman, Co-Director of the Controlled Environment Agriculture Innovation Center and Vice President of Applied Research at IALR.  “We look forward to showcasing the innovative research and education programs we are developing to support the growth of the CEA industry.”

For more information and to register to attend,exhibit and to learn more about speaking opportunities for the CEA Summit East 2023, please visit the event website at www.ceasummit.com

ABOUT INDOOR AG-CON
Founded in 2013, Indoor Ag-Con has emerged as the largest trade event for vertical farming | controlled environment agriculture, the practice of growing crops in indoor systems, using hydroponic, aquaponic and aeroponic techniques. Its events are crop-agnostic and touch all sectors of the business, covering produce, legal cannabis |hemp, alternate protein and non-food crops. More information –www.indoor.ag | 404.991.5186

ABOUT THE SCHOOL OF PLANT AND ENVIRONMENTAL SCIENCES AT VIRGINIA TECH
The School of Plant and Environmental Sciences at Virginia Tech trains the next generation of professionals in the fields of plant breeding and genetics, agronomic and horticultural crop production, plant protection, soil and water systems management, agricultural technologies, environmental restoration and agro-environmental stewardship.  It conducts research to improve agricultural productivity, reduce negative impacts on the environment and improve soil and water health.  Through extension programs, it provides science-based information to stakeholders to help them feed the world while protecting the environment.  More information —www.spes.vt.edu

ABOUT THE VIRGINIA SEAFOOD AGRICULTURAL RESEARCH AND EXTENSION CENTER AT VIRGINIA TECH
The Virginia Seafood Agricultural Research and Extension Center at Virginia Tech works to support the future of the historic seafood industry — in Virginia and beyond. Its extension specialists work with industry and research partners to identify and respond to emerging needs and provide technical guidance to stakeholders in every level of the seafood supply chain. Through technical assistance, training, process validation, value-added product development, and more, it helps stakeholders ensure product quality, safety, and viability. More information — www.arec.vaes.vt.edu

ABOUT IALR
The Institute for Advanced Learning and Research (IALR) serves as a regional catalyst for economic transformation. Core focus areas include research that provides a clear path to commercialization, advanced learning opportunities where education meets experience, training and rapid-launch space for advanced manufacturers, and economic development through conferencing and a partnership with the Southern Virginia Regional Alliance. It is located in scenic and historic Danville-Pittsylvania County on the VA/NC state line, within a short drive of Roanoke, Greensboro and Raleigh.  More information – www.ialr.org

IUNU has been releasing the leading industry report on CEA since 2016. The report was formerly titled State of Indoor Farming and managed by Artemis, which was acquired by IUNU in 2021.

This year, the company will expand the report to focus on the different leading segments of the Controlled Environment Agriculture industry: greenhouse fruit and vegetable, and greenhouse ornamental production.

IUNU is researching and releasing the 2023 State of CEA report in partnership with the University of California Agriculture and Natural Resources (UC ANR). Their VINE agrifood technology innovation program, Global Controlled Environment Agriculture Consortium (GCEAC), and UC Davis-led AI Institute for Next Generation Food Systems (AIFS) will also collaborate on the report.

Gabe Youtsey, Chief Innovation Officer at UC ANR and co-founder of The VINE said “an industry-led, market-driven approach to guiding innovation priorities and investments is critical as we consider the future of indoor farming. I’m thrilled to partner with IUNU on the development of this State of CEA report with our UC innovation teams from The VINE, GCEAC, and AIFS to create a robust state of CEA report that will guide our CEA open innovation priorities this year.”

Since the survey launched in 2016, more than 500 growers have participated in the survey and more than 2 million people have downloaded the report. The industry reports have become one of the most widely circulated and respected sources of industry data.

Allison Kopf, Chief Growth Officer of IUNU said, “this report is a trusted resource for the industry and we’re thrilled to bring it back in an expanded capacity. Over the past year, we’ve seen a swell of news around our industry. This report will go deeper into those stories and share data on how companies are performing, big market opportunities, and the real challenges growers are facing.”

You can download past reports here. Recently, IUNU also released a comprehensive report on the Brown Rugose Virus impacting tomato growers worldwide which you can access here.

Greenhouse operators can participate in the 2023 State of CEA survey here. The survey takes approximately 25 minutes to complete. All organizations in CEA (greenhouse, high tunnel, or indoor) are invited to participate. All data collected is confidential and shared only via anonymous trends. No identifying information is ever shared.

The survey will remain open for a few weeks and IUNU expects to launch the 2023 State of CEA report immediately following.

About IUNU

Founded in 2013 and headquartered in Seattle, IUNU aims to close the loop in greenhouse autonomy and is focused on being the world’s leading controlled environment specialist. IUNU’s flagship platform, LUNA, combines software with a variety of high-definition cameras — both fixed and mobile — and environmental sensors to keep track of the minutiae of plant growth and health in indoor ag settings. LUNA’s goal is to turn commercial greenhouses into precise, predictable, demand-based manufacturers that optimize yield, labor, and product quality. www.IUNU.com

About The VINE by UC ANR

The VINE is California’s agriculture, food and biotech innovation network powered by the University of California Agriculture and Natural Resources (UC ANR). We believe that the state’s continued prosperity rests on creation of more productive, sustainable, and equitable food systems. Every day, we harness the power of open innovation to connect entrepreneurs to a broad network of public and private sector resources to enable them to grow and scale globally, build collaborations that catalyze the development of climate-smart technology-based solutions to solve industry challenges, and grow regional capacity to support global innovation as an economic opportunity—because our future, and the nation’s, depends on it.

The Global Controlled Environment Agriculture Consortium (GCEAC) – an initiative of The VINE – seeks to build a worldwide ecosystem to bring technology to market that addresses global challenges in food, health, and sustainability. GCEAC is an open innovation partnership between industry, university and government sectors in the United States and The Netherlands, led from California.

MEDFORD, MA – March 13, 2023 – The DesignLights Consortium (DLC) will begin accepting applications on March 31 from horticultural lighting manufacturers interested in qualifying their products under the DLC’s Horticultural Lighting Technical Requirements Version 3.0.

Finalized in December 2022, the V3.0 requirements increase the efficacy and establish additional minimum performance baselines for LED luminaires, lamps, and controls used by the controlled environment agriculture (CEA) industry. V3.0 also introduces a surveillance testing policy intended to protect the integrity and value of the DLC’s Horticultural Qualified Products List (QPL) for all stakeholders.

With the North American CEA industry projected to grow to $8 billion by 2026 and horticultural lighting one of the fastest growing segments of the electric load for many utilities, the DLC’s Horticultural Technical Requirements promote energy efficient technology in CEA facilities, guiding the industry toward sustainable growth in concert with decarbonization efforts.

“The DLC is pleased to begin taking applications for the newest version of our horticultural QPL, supporting effective, energy efficient horticultural lighting in the fast-growing CEA industry,” DLC Executive Director and CEO Christina Halfpenny said. “There has been a 17.5 percent increase in the efficacy of listed products since we introduced the DLC’s horticultural lighting program in 2018. We are proud to collaborate with cultivators and lighting manufacturers to continually advance sustainability in CEA.”

Provisions of the Horticultural Lighting Technical Requirements V3.0 include:

• Increasing (for the first time since the Horticultural Lighting Program launched) the Photosynthetic Photon Efficacy (PPE) threshold of QPL products – a 21 percent increase over the previous PPE threshold, setting a baseline for LED-based horticultural lighting that is 35 percent above the most efficacious non-LED option (1,000-watt double-ended high pressure sodium luminaire);
• Introducing requirements for reporting product application information, including product dimensions and representative images to be published on the Hort QPL, giving efficiency programs and QPL users greater insight into a product’s intended use;
• Introducing product-level controllability requirements – including dimming capability for certain AC-powered and all DC-powered luminaires and replacement lamps, and reporting of additional controllability details to enable more functionality and energy savings, promote interoperability and lay the groundwork for future demand-response efforts;
• Introducing a surveillance testing policy whereby the DLC will actively monitor the validity of data and other information it receives.

The updated policy provides indoor commercial growers with significant product variety and increased savings opportunities. A searchable, filterable online resource that offers users apples-to-apples comparisons of almost 1,200 horticultural LEDs, the Horticultural QPL has grown more than 16-fold in the past two years. More than 50 North American energy efficiency programs require CEA operators to reference the DLC QPL to qualify for energy efficiency incentives (representing 91 percent of the DLC’s membership), and others have incorporated the DLC technical requirements into their programs. Two states with cannabis-specific energy efficiency regulations (Massachusetts and Illinois) offer a compliance pathway via the DLC’s Horticultural QPL.

The DLC will provide an overview on the Hort V3.0 product application process during a webinar on March 15 at 1 p.m. EDT.

About the DesignLights Consortium: The DLC is a non-profit organization improving energy efficiency, lighting quality, and the human experience in the built environment. We collaborate with utilities, energy efficiency programs, manufacturers, lighting designers, building owners, and government entities to create rigorous criteria for lighting performance that keeps up with the pace of technology. Together, we’re creating solutions for a better future with better lighting.

Indoor Ag-Con marked its 10^th Anniversary Edition with record increases in attendee and exhibitor participation for its February 27-28, 2023 run at Caesars Forum Las Vegas. The exhibitor booth roster doubled with a sold-out show floor featuring 134 companies in 174 booths vs 70 companies in 80 booths for 2022.  Attendance saw a 62% increase over 2022 with 1453 attendees from 48 US states, the District of Columbia and US territories, as well as 29 other countries. Attendees included C-level execs and other decision-makers involved with every sector of controlled environment agriculture — growers, investors, tech providers, start-ups, academia, government, food service retail, suppliers and more.
For the second year, Indoor Ag-Con once again co-located with the National Grocers Association (NGA) Show, attracting 200+ attendees from that event to the Indoor Ag-Con expo floor — taking the total attendance number over the 1600 mark.

“We are thrilled with the incredible growth Indoor Ag-Con continues to experience year-on-year,” says Brian Sullivan, CEO, Indoor Ag-Con. “This tremendous response from the industry — particularly our growing international attendance – positions Indoor Ag-Con as the global event for CEA  and confirms the growing importance and potential of vertical farming and controlled environment agriculture.  As we continue to evolve and adapt to the changing needs of our community, we are committed to delivering a high-quality event that provides unparalleled education, networking, and business growth opportunities for our attendees and exhibitors.  We look forward to an even brighter future for Indoor Ag-Con and the entire indoor agriculture industry”

Among the 10^th Anniversary Edition highlights:

CEO Keynote Sessions

Attendees had the chance to hear different perspectives from key executives from both the investment and farm operation sectors.  Arama Kukutai, CEO, Plenty kicked off day one with the opening morning keynote on February 27, 2023.  During the second part of his address, he welcomed surprise guest, Mark Hagan, Chief Investment Officer, Realty Income, who joined him on stage for a fireside chat sharing more about the recently announced strategic  real estate alliance to support the development of Plenty’s indoor vertical farms. Later that day Vonnie Estes, Vice President of Technology for the International Fresh Produce Association (IFPA) moderated the keynote panel, “The Ever-Changing Business Model Of Controlled Environment Agriculture Farming,” with Steve Platt, CEO, BrightFarms; Matt Ryan, CEO, Soli Organic; and Dave Vosburg, CIO, Local Bounti. On day two, February 28, 2023,  Dave Chen, CEO, Equilibrium, took the stage to share his thoughts on  “The State of CEA and the Road Ahead.”

Educational Tracks & Expo Floor Theater Panel Discussions

The 2023 edition featured 3 educational tracks – Grower, Trends & Innovation and Funding & Guidance– that brought industry experts together covering a  wide range of topics from lighting solutions outside of standard wavelengths, to lessons learned from business failures, food security, strawberry production and workforce development and more.  In addition, the Expo Floor Theater featured a Hardball session on the state of vertical farming; and fireside chats with leaders from Unfold and GoodLeaf and a session on installation success.  In addition, the 2023 edition welcomed a  new debate format with sessions like greenhouse v. vertical farming, pre-built v. custom-built controlled environments and container v vertical farming. 

Sold Out Expo Floor

Doubling in size over 2023, this year’s expo floor was home to some of the biggest names in CEA as well as up-and-coming suppliers.  From lighting and grow systems to substrates and irrigation, growers were able to see the newest innovations all under one roof.

Indoor Ag-Con |Philips VIP Welcome Party

Back by popular demand, Philips Horticulture LED Solutions teamed up once again with Indoor Ag-Con to tee-up the 2023 edition with a VIP Welcome Par-tee on Sunday evening, February 26 at Topgolf Las Vegas.  Indoor Ag-Con conference speakers and other industry VIPs came together for an incredible evening of golf, networking, cocktails, food, music and fun – all compliments of Philips Horticulture LED Solutions.

Networking Opportunities
Daily lunches and an afternoon cocktail reception on the expo floor expanded the show’s networking opportunities.

Looking ahead, Indoor Ag-Con Las Vegas will return to Caesars Forum March 11-12, 2024 and will once again co-locate with The National Grocers Association Show.

About Indoor Ag-Con

Founded in 2013, Indoor Ag-Con has emerged as the largest trade show and conference for vertical farming | controlled environment agriculture in the United States. Its events are crop-agnostic and touch all sectors of the business, covering produce, legal cannabis | hemp, alternate protein and non-food crops. More information – www.indoor.ag

Researchers with the OptimIA project are working to solve the environmental control issues facing indoor farm growers.

While some might think that the environmental challenges facing indoor farm growers should be relatively minor and easy to overcome in a closed environment, they’d be wrong.

“Some of the challenges and bottlenecks facing indoor farms include insufficient airflow leading to a non-uniform environment, lighting that is wasteful and how light is delivered into the canopy,” said Murat Kacira, director of the Controlled Environment Agriculture Center (CEAC) at the University of Arizona and a member of the OptimIA project research team. “In addition to these challenges, there are those related to the humidity and water management in the aerial environment as well as identifying the best light quality, light intensity and light recipes for indoor farm crops.”

Prior to the start of the OptimIA project in 2019, surveys were conducted of stakeholders in the indoor farm industry, including growers, to determine what are the areas of greatest need for research.

“An indoor farm is a closed box,” Kacira said. “You know what goes in and what comes out, but it demands the resources to control that environment, which include controlling the light, temperature, humidity, carbon dioxide and all other processes to grow the crop to meet production expectations.  

“An indoor farm offers tighter control than in a greenhouse environment. There is not the same effect from the outdoor dynamics, for example the light intensity, temperature and water recirculation from the air. Being able to harvest the water from the air is easier in an indoor farm system compared to a greenhouse system. There is more controllability when it comes to an indoor farm compared to a greenhouse, of course with an additional expense for resource use to achieve such control.”

Focused on environmental control

Kacira and his team of graduate students KC Shasteen and Christopher Kaufmann at the University of Arizona are significant contributors on the environmental control aspects of the OptimIA project.

“We are also considering light because light brings the energy to the plants and then the energy has to be released for cooling and for proper transpiration and nutrient deployment from the roots,” Kacira said.

Kacira’s team conducted computer simulations to help improve airflow and to identify co-optimization of environmental variables for energy savings. Building upon computer simulation research outcomes, Kaufmann is conducting experiments in CEAC’s vertical farm facility to evaluate vertical and horizontal airflow system designs to mitigate tipburn on lettuce crops. Shasteen and Kacira worked on modeling with the co-optimization of variables, including light, temperature, relative humidity and carbon dioxide level.

“We have been able to quantify yield outcomes and to determine what the energy use would be for any of those environmental control strategies,” Kacira said. “These models and the outcomes and information that we have generated from this research are used by our OptimIA colleagues on the economics team. They are developing economic models for a variety of scenarios of profitability and economics for indoor farm applications and indoor farm systems.

“We are focused primarily on airflow system design and optimization, humidity management and co-optimization of environmental variables mainly for energy savings. Our collaborations also included Nadia Sabeh at Dr. Greenhouse on the humidity management side of the environmental control aspect.”

Real-world applications

Some of the research outcomes from the University of Arizona team related to airflow systems designs, concepts and recommendations have been incorporated into actual growing settings in commercial operations.

“We are able to incorporate some of our research results into commercial site trials through our collaborations,” Kacira said. “We have over 20 industry collaborators as part of the OptimIA project. Some of the collaborators showed interest in implementing some of the airflow system designs, environment control, and co-optimization of these variables into their operations. We will also have an opportunity before the OptimIA project ends to implement them directly and evaluate some of the research outcomes in commercial settings.”

Saving on energy costs

Sole-source lighting is the largest energy cost of indoor farms. Indoor farm energy costs account for at least 30 percent of the total operational costs. Other energy costs are related to operating fans, dehumidification and ventilation.

“The focus of the OptimIA research at Purdue University is to identify and try to reduce the energy costs related to growing indoor crops,” said Cary Mitchell, horticulture professor at Purdue University. “If an indoor farm grower is using sole-source lighting that is going to be the biggest energy cost. These indoor farms spend hundreds of thousands of dollars per year on electricity and it’s mostly for lighting.”

Mitchell has long been interested in energy as one of the profit-determining and profit-limiting parameters in indoor farming.

“All of the OptimIA researchers are interested in saving resources for growing leafy greens and culinary herbs indoors,” he said. “That is the common thread among all of us. Purdue researchers are focused on energy savings. “

Avoid wasting light

Mitchell and PhD graduate student Fatemeh Sheibani are working on close-canopy LED lighting. This lighting is similar to intra-canopy lighting that is used on some greenhouse crops including high wire tomatoes and fresh cut roses.

“One of our findings is if the separation distance is reduced between the LED light fixtures and the crop below without dimming the LEDs, the productivity of the plants goes up,” he said.

LEDs are a point source of light with much of the light radiating like a star in all directions.

“When LED fixtures are mounted overhead in an indoor farm much of the light goes to the side obliquely,” Mitchell said. “Not all of the light is going down towards the plants. There is a significant amount of photons wasted falling outside of the cropping area. There’s not much that can be done about it other than to move the lights closer to the plants.” 

Because LEDs are cool, unlike high intensity discharge (HID) lamps, the separation distance between LED fixtures and the plants can be decreased without burning the plants.

“The separation distance can be reduced so that most of the obliquely emitted photons actually are captured by the crop surface instead of going off the edge of the bench,” Mitchell said. “Regardless of whether growers run LED fixtures along the bench or across the bench, they don’t want gradients of crop growth. Growers want just as much growth on the edges as in the middle of the bench. This can cause growers to mount lights not only in the middle of the bench, but also out towards the edges. The further toward the edges the fixtures are mounted, the more photons are lost.”

Putting more light on the plants

Sheibani is studying two scenarios of close-canopy lighting. One scenario is as the LED lights are placed closer to the plants, the light is dimmed. Even though the light is dimmed, there is the same intensity of light at the plant surface because more laterally emitted photons are captured, but less electricity is used. In a second scenario, Sheibani placed the LED lights closer to the plants, but did not dim them.

“In this second scenario, placing the fixtures closer to the plants once again reduced the amount of photon loss,” Mitchell said. “In this case, for the same power and energy usage the plant yields increased because the effective light intensity increased. The plants grew faster and bigger. Each increment of closer spacing results in a higher energy utilization efficiency.”

In indoor vertical farms the traditional separation distance between the bottom of the LED fixtures and the top of the crop is 40-50 centimeters.

“We have tested separation distances between the fixtures and plants of 45, 35, 25 and 15 centimeters,” Mitchell said. “We found that energy utilization efficiency increases linearly as the lights are placed closer to the plants. This should be relatively easy to implement in most indoor farms, but may require some design modifications from equipment suppliers.”

Mitchell explained the reason the two scenarios were studied is because some indoor farms are equipped with non-dimmable LED lights.

“In the case of non-dimmable LED fixtures, when the lights are brought closer to the plants, the energy draw by the lights is the same, but the yield goes up, which means the plants grow faster,” he said. “This means the plants can reach the same biomass and be harvested earlier or the harvest date can remain the same and more biomass can be produced. This gives growers the option to use close-canopy lighting for what works best for their production needs.”

Mitchell points out that not every LED fixture commercially available works well in close-canopy lighting applications.

“There are some LED lights where the distribution of colors is not uniform, where there are clusters of blue light,” he said. “This is not a big deal with a 45-centimeter separation distance between the lights and the plants because with the amount of beam spread there is enough distance for the other colors to overlap the blue light. But when the lights are placed within 25 to 15 centimeters of the plant surface, there are clusters of blue light. Blue light inhibits leaf expansion and promotes leaf coloration. The result can be very strange looking crop stands if close-canopy lighting is done with LEDs with uneven light distribution. Fortunately for growers, most of the commercial LED arrays available today for horticultural lighting are quite uniform.”

For more: Murat Kacira, University of Arizona, Controlled Environment Agriculture Center; mkacira@arizona.edu; http://ceac.arizona.edu/. Cary Mitchell, Purdue University, Horticulture & Landscape Architecture; cmitchel@purdue.edu; https://ag.purdue.edu/department/hla/directory.html#/cmitchel.

This article is property of Urban Ag News and was written by David Kuack, a freelance technical writer in Fort Worth, Texas.