FLT Highlight

Written by Mary Hathaway, OFRF’s Research & Education Program Manager

Maggie Dungan, farmer at Salad Days Farm

Salad Days farm is a diverse vegetable operation situated on 30 acres in Versailles, Kentucky. Certified organic since 2015, farmer Maggie Dungan’s interest in growing food started with an education in nutrition and the long dream for her family to be self-sustaining. The farm grows  year round in the field and in hoop houses to supply their on-farm store, restaurants, schools, and four weekly farmers markets.

Maggie works hard to keep mechanization on her farm minimal, focusing on cover cropping, minimal tillage, and other soil health conservation practices. She keeps only 2-4 acres of the farm in production, allowing her to focus on the quality of her systems to grow high value and sustainable food for her community.

Impact of Solarization on Soil Microbiology

Solarization plots in the high tunnel.

Maggie was first exposed to the practice of solarization using clear plastic in 2022 when the farm participated in a research project with the University of Kentucky. The project studied the effect of solarization in high tunnels on root-knot nematode populations. She was impressed by the results of the trial, and saw first-hand how this technique impacted a persistent soil pathogen. 

Organic farmers like Maggie that focus on minimizing tillage must still manage pathogens, weeds, and other common challenges, and solarization offers potential benefits. However, Maggie was concerned about the impact of the treatment on her soil health, and had some questions – if solarization kills pathogens, won’t it kill the good microbiology, too? How does heat smothering with a plastic tarp impact soil microbial activity? What is the impact on fungal to bacterial ratios?

Before beginning to incorporate soil solarization into her field plans, Maggie wanted some answers, and applied for OFRF’s Farmer-Led Trial program to help her build out a solid research plan and find reliable results that would have a positive impact on her operation.

Farm trial plan

With technical support from OFRF, the Salad Days trial on soil solarization took shape. By refining her research question to: “What is the temporal and population effect of solarization on the beneficial microbes in the high tunnel?,” the research team was able to build an approachable and testable project on the farm.  

Maggie and OFRF built out a block design with two treatments: No soil solarization in the hoop house, used as her control, or regular practice compared to soil solarization in the hoop house. Using her 30’x100’ hoop house as the location for the trial and mapping areas for the treatments, Maggie used a microbiometer to take three different soil samples: first a baseline reading, then one 2 weeks and 4 weeks, respectively, after the tarp had been removed from the treatment plots.

On-farm trial updates

Maggie took her final soil reading in early August, four weeks after she removed the tarps from their beds. While she originally hypothesized that the soil microbes would bounce back, she guessed that their populations would need some time to recover after the tarp treatment. 

Soil testing for the On Farm Trial.

The OFRF team has begun to work with the data collected to get an understanding of any significant differences. In Maggie’s experiment, we see that microbial biomass over time differed depending on whether or not the area had been tarped. Under solarization, microbial biomass increased over time, while biomass decreased over time in areas that had not been tarped. As well, the Fungal to Bacterial ratio was higher under solarization than bare soil. The ratio was not affected by time after tarp removal.

The data is compelling, and OFRF will be looking into similar research to better understand the why of these results and give Maggie the assurance she is looking for to deploy a practice that continues to foster the health of her soil and improve her farming system.

This story is part of a series profiling farmers who are taking part in OFRF’s Farmer-Led Trials (FLT) program. Farmers receive technical support from OFRF to address their challenges through structured on-farm trials. To learn more about OFRF’s Farmer-Led Trials Program, visit our website page at https://ofrf.org/research/farmer-led-research-trials/

To learn more about soil solarization, check out these helpful resources on the web: https://extension.umn.edu/planting-and-growing-guides/solarization-occultation 

To learn more about Salad Days Farm, visit https://www.saladdaysfarm.com

Written by Jose Perez, OFRF’s Research & Education Engagement Coordinator

Image: Jorge Reyes in the vineyard.

Jorge proudly comes from a Mexican migrant farmworker family who had a dream of owning a farm one day. After retiring from the Navy, he was able to purchase a 3 acre vineyard located in Potrero, California. Jorge’s young vineyard produces organic grapes and it is in the process of obtaining organic certification. Jorge plans to produce organic wine.

Finding the right on-farm challenge to focus on

Jorge was initially interested in conducting a farm trial to find solutions for suppressing gophers. These little creatures are a constant challenge at the vineyard, because they burrow in the soil, and chew on the roots, severely damaging or killing the vines. He was also interested in testing different practices to manage wasps during grape maturation and harvest. OFRF staff discussed with Jorge the difficulty of designing a farm trial based on these two challenges, given practical limitations, such as the size of the farm and the length of time needed.

The challenges on a young vineyard are not in short supply, so Jorge pivoted to focus on the use of mulch for soil moisture retention, weed management and grape quality. Improving soil moisture is critical to Jorge’s operation, as the irrigation depends on a solar powered pump. The local climate conditions are generally very dry, with 9 to 11 inches of rain during the winter season. Wild fires are a frequent risk during the dry season, making soil moisture a critical factor and cost to Jorge’s operation.

On-farm trial updates

With OFRF technical support, Jorge is now conducting a paired comparison where 10 grapevines with mulch will be compared with 10 vines with no mulch. Jorge applied 3 inches high of mulch around the vine (about a 4 feet area for each vine) in late May. He has marked the trial area with stakes identifying each plant. 

To compare the moisture levels of the two treatments, Jorge purchased a soil moisture sensor. To date, he has conducted two measurements, one in late June, and one in mid-July. Based on those readings, Jorge already sees a clear winner: The soil around the mulched grapevines have consistently been showing good moisture levels, while the readings around the un-mulched plants show dry conditions. This is confirmed by Jorge’s own observations: “The mulch is like a double win, the mulch holds the moisture for longer and it suppresses the weeds as well… There are also a lot of creatures and biological activity in the mulched areas, while just putting the soil probe into the un-mulched areas was a challenge, as the soil was hard,” Jorge said.

Image: Side-by-side trials of mulched and un-mulched grape vines.

Jorge has not cut back on irrigation, but after seeing the immediate effects of mulch, he is considering doing so, which would represent some energy and cost savings. In terms of weed suppression, the pictures Jorge took of the plants in late June are striking (see attached pictures). The mulch successfully suppressed weed growth and can represent some labor savings in the long term. Finally, Jorge is curious to know if the mulch will have an effect on the grapes’ sugar content levels. He is planning to conduct these measurements at harvest through a Brix meter.

Below images: un-mulched grape vines on left and mulched grape vines on right. 

At OFRF we are excited to partner with Jorge in his quest to produce a high quality organic wine, while sharing with other small scale grapevine producers the effects of mulching.

“I am 100% sold on organic, protecting our environment and learning to cohabitate with nature. Organic should be the only option, we need to consume healthy food that is not going to poison us.” – Jorge Reyes 

This story is part of a series profiling farmers who are taking part in OFRF’s Farmer-Led Trials (FLT) program. Farmers receive technical support from OFRF to address their challenges through structured on-farm trials. To learn more about OFRF’s Farmer-Led Trials Program, visit our website page at https://ofrf.org/research/farmer-led-research-trials/

Written by Jose Perez, OFRF’s Research & Education Engagement Coordinator

Rhianna Simes, M.S.Ed. owns and operates Verdant Phoenix Farm, a 10 acre urban farm and education center located in Jackson County, Oregon. The farm is managed as a no-till production system and is certified organic. Rhianna operates the farm as a research and education hub, hosting educational workshops, hands-on demonstrations and farm tours. She sells nursery stock, seeds, basketry willow, plant starts, and other products through the farm stand and on their website. Additionally, Rhianna has been breeding fava bean, and popcorn (working towards a ‘Phoenix Blackberry’) for years. Rhianna’s farm vision is inspired by the work of Masanobu Fukuoka, Rowen White and Dr. Elaine Ingham, to create thriving agroecosystems.

Image at right: A close up of the soil after tarps were removed.

Occultation tarping

Rhianna has been using occultation tarping to terminate cover crops and manage weeds while protecting soil health for years. In two different locations, she converted 10 acre hay fields into no-till,  row cropping systems using only occultation tarping. To do this, in 4-6 week increments, she places a vinyl tarp on top of the soil to act as a ‘smother’ which encourages the biological activity of the soil to eat the organic matter on the soil (and under the tarp). In the past, farmers employed solarization, but this method allows sunlight to heat the soil, but does not encourage the biological activity which happens only in the darkness (occult = dark). By not allowing any light through, occultation tarping supports the soil food web, and can help suppress weeds, terminate cover crops and protect the soil from erosion. This practice has a lot of potential to help small scale organic farms, especially in no-till systems. Occultation removes the need for tilling to terminate weeds and crops. Rhianna is passionate about sharing the multiple benefits of using occultation tarping in small farms, but she has often found a lack of trusted information and research demonstrating the usefulness of this practice. 

The farm trial

With technical support from OFRF, Rhianna decided to create a farm trial that would compare the use of occultation tarping in no-till and tilled conditions. This means that she is investigating two different practices in the same trial: tarping and tilling. Soil sampling will be the primary way to measure differences in these practices, and will evaluate soil parameters such as soil organic matter, carbon mineralization potential and aggregate stability. Yield of planted crops will also be compared among treatments. 

Rhianna began the farm trial in a non-cultivated field in mid-April. Before placing the tarps, she took a baseline soil sample and sent it to Oregon State University Soil Lab for analysis. As planned in her research design, she laid tarps on the no-till fields for 6 weeks, and in late June she removed the tarps and direct seeded the field with a reliable polyculture that includes popcorn, bush beans, radish, basil, beets and fava beans. Rhianna and the OFRF team are excited for the yield and soil sample data that will be taken after harvest this fall. 

Rhianna is invested in this farm trial in the long term, as she has been awarded additional funds from Western SARE Farmer / Rancher grant  to continue this research for 3 years. At OFRF we are excited to be part of Rhianna’s effort to investigate the potential of these practices for small scale organic farmers in the region and beyond.

Below images: On the left – A view of the tarping and tilling trial. On the right  – another view of the farm trial showing tarping and non tarping areas.

“The OFRF Farmer-Led Trial program removes barriers for organic farmers to conduct research on strategies that can and will revolutionize farming. We are innovators in our fields, and the solutions we create today are the answers to tomorrow’s challenges. This program helps to legitimize the research, and trial and error experimenting that, as farmers, we do everyday.” – Rhianna Simes 

To learn more about the work Rhianna does, check out the Verdant Phoenix Farm website https://verdantphoenix.com/about/

This story is part of a series profiling farmers who are taking part in OFRF’s Farmer-Led Trials (FLT) program. Farmers receive technical support from OFRF to address their challenges through structured on-farm trials. To learn more about OFRF’s Farmer-Led Trials Program, visit our website page at https://ofrf.org/research/farmer-led-research-trials/

Written by Jose Perez, OFRF’s Research & Education Engagement Coordinator

Bob Quinn is a well-known fourth generation organic farmer growing grains in the plains of Montana. His farm grows winter wheat, alfalfa, and other grains. Bob is a long time organic farmer and advocate and is recognized as the pioneer of Kamut, a type of wheat that is now produced by more than 250 organic producers. His latest venture is the Quinn Institute, a recently launched non profit farm dedicated to conducting organic farming research. This year he is also a participating farmer in the first cohort of OFRF’s Farmer Led Trials (FLT) Program.

Image at right: A view of the research plot crop lines growing in May.

A quest for a hardy white winter wheat

Growing spring wheat in this region has become increasingly risky for farmers due to climate change challenges that include shorter rainy seasons and earlier than usual summer heat onset. Years ago Bob felt that growing a hardy and resilient white winter wheat was a good solution, but he found no locally adapted varieties available. Winter wheat varieties are planted in the fall, go dormant in the winter, and are harvested in the summer. These varieties have more time to get established and could reduce the risk of crop loss due to the climate change patterns mentioned above. Bob looked for options that would show promise in the genetic diversity stored in the USDA National Small Grain Seed Collection. When Bob heard about OFRF’s Farmer-Led Trials Program, he thought it would be a good opportunity for research collaboration.

The farm trial

Starting with 100 selections from the USDA small grains collection, Bob has now winnowed down possible wheat lines to 15 types that show promise in the field. From the baker and consumer perspectives, Bob hopes to select a nutrient-dense wheat that produces bread loaves that are not as dark as those produced with hard red winter wheat.

Harvest from each line will be tested through a bake test for loaf size, texture, taste and aroma by our bakery partner, Grist Mills, in Missoula, Montana, and compared to a complete baking test by the bread lab at Montana State University. The goal for this year’s farm trial is to select the top 5 or 6 lines to be grown again next year. The final goal of this research project is to produce a free, open mixed population of white winter wheat that can be used by organic farmers in the region that can be used by bakers to produce a highly nutritious tasty bread for their customers.

Below images: Bob, and Research Coordinator Josh, inspecting winter wheat survival in mid-April.

Trial updates

The current crop was planted in October last year, survived the winter, and is currently growing vigorously, thanks to better than expected rainy season. Harvest is fast approaching, and scheduled for late July. OFRF is excited about Bob’s trial and hopes it leads to resilient variety alternatives for organic farmers.

To learn more about USDA germplasm resources, visit the USDA Germplasm Resources Information Network https://npgsweb.ars-grin.gov/gringlobal/search  

To learn more about the Quinn Institute visit https://quinninstitute.org/ or take a peek at this recent article about their work: https://www.prweb.com/releases/agricultures-new-frontier-the-quinn-institute-unveiled-302134818.html

This story is part of a series profiling farmers who are taking part in OFRF’s Farmer Led Trials (FLT) program. Farmers receive technical support from OFRF to address their challenges through structured on-farm trials. To learn more about OFRF Farmer Led Trials Program, visit our website page at https://ofrf.org/research/farmer-led-research-trials/

Written by Jose Perez, OFRF’s Research & Education Engagement Coordinator

Nathan Lada is one of the four co-owners of Green Things Farm Collective, a diversified vegetable farm located in Ann Arbor, Michigan. The farmers produce an array of fresh market vegetables and cut flowers for CSA memberships, farmers’ markets, small grocery and small wholesale markets. The bulk of the production takes place in five acres of permanent no till/low till, deep mulch bed system from early April to October. The farmers also raise beef cattle and manage 40 acres of woods.

Nathan and his wife Jill started farming in this farm location in 2011, but the farm became what it is now when a longtime employee and two other independent farmers joined them in 2020. Since then, they have managed the farm as a single-unit LLC. The farm has been certified organic under the USDA since 2015, and has been Real Organic Project certified since 2020.

At right: Collective Farmers in 2020: Eric Kampe (left the farm in 2022), Hannah Weber, Jill Lada, Nate Lada, Michelle Brosius.

Figuring out plant spacing and densities

“Our primary focus is producing high-yielding species and varieties with lots of hand labor,” said Nathan. The farm operation employs between 15 to 20 people in the main season with the goal of maximizing production. “It’s hard to find information from other growers about their trials on spacing and plant densities, especially for high organic matter, high fertility, and fast turnover bed systems,” continued Nathan. When he heard about OFRF’s Farmer-Led Trial program from one of his employees, it immediately piqued his interest. 

While the farm has done some limited experiments, they do not have comprehensive data to help them determine which row spacings are best for their production practices. Nathan and his colleagues hope that maximizing yield per bed will help the farm increase production without needing to develop new growing spaces. Nathan is excited to see the results and share the outcome of this trial with other growers looking for similar information.

Farm trial plan

Beets and radishes are the focus of the farm trial because they are among the most produced crops at the farm, being planted in succession every week or every other week during the season. Although the farm already collects yield and some crop quality data per bed, conducting the on-farm trial with OFRF will provide the direct technical support to be more methodical and comprehensive in designing the farm trial, conducting data collection, and drawing trustworthy results. 

Preliminary farm trial plans include comparing two crop configurations for one beet variety and two crop configurations for two varieties of radishes for yield and crop marketability. Potential measurements identified include overall yield (bunches per bed, pounds per bed), losses due to undersized or oversized crops, losses to disease, days to maturity, and crop quality.

The farmers have participated in on-farm research in the past, but felt that those trials did not reflect farm working conditions. One goal Nathan expressed was to integrate the trial into their existing production plan, so OFRF is working with Nathan and his team to design an on-farm trial that is both useful and practical for the farm without disrupting their seasonal production. At OFRF, we are excited to be a part of Green Things Farm Collective’s journey, and hope that their work will inspire more farmers to conduct research trials on their farms.

This story is part of a series profiling farmers who are taking part in OFRF’s Farmer-Led Trials (FLT) program. Farmers receive technical support from OFRF to address their challenges through structured on-farm trials. To learn more about OFRF’s Farmer-Led Trials Program, visit our website page at https://ofrf.org/research/farmer-led-research-trials/

Written by Jose Perez, OFRF’s Research & Education Engagement Coordinator

Tim and Becky Colby own Colby Farms, a 14 acre farm in Papillion, Nebraska, where they produce vegetables, fruits and some livestock products for their community. As beginner and veteran farmers, they are in their second year of transitioning a historically conventional farm to organic production. Having previously farmed in Arizona for 3 years, they came back to Nebraska to tend the land where Becky’s grandfather once farmed.

Tim and Becky have exciting plans for their farm. They hope, in time, to create a farm-to-school program, offer value-added food classes, and build a commercial kitchen. They hope to establish a fruit orchard with apples, peaches and other stone fruits to offer u-pick, as well as raise chickens, goats, bees, and perhaps cows. 

Dealing with soil compaction

The farm is located in a floodplain with clay heavy soil vulnerable to compaction. Decades of conventional corn and soybean rotations have contributed to this problem. Tim and Becky knew from the beginning that they needed to improve soil structure to produce quality crops. A USDA representative also noticed soil compaction and recommended using deep taproot cover crops to address this challenge. 

In their first year at their Nebraska farm, they planted a sorghum sudangrass cover crop, which resulted in a lot of organic matter produced. However, they quickly noticed that the cover crop roots had failed to penetrate the soil beyond the hardpan. 

Tim and Becky had a lot of questions to address regarding the use of cover crops to reduce soil compaction: What cover crop species should they use? How many cover crop cycles are needed? And, would there be any potential weed or pest concerns? Weed pressure is very high due to continuous use of the same crop rotation in the land for over 30 years. Sorghum sudan appeared to provide very good weed suppression but only after mowing three times. On the other hand, they are concerned about possible infestations of Japanese beetles, which have occurred in the past on soybeans. How would the cover crop respond to such an infestation?  This is where their interest in OFRF’s Farmer Led Trials (FLT) Program came in.

Farm trial plan

OFRF staff is currently working with Tim and Becky to figure out the best way to establish a cover crop comparison trial that can point towards the best cover crop options for reducing soil compaction at the farm. Using a 2 acre area, preliminary plans are to plant a mix of peas, oats and vetch during spring and make the comparison for the fall season using daikon radish, tillage radish, rye and canola cover crops. Preliminary measures include soil compaction, weed suppression, and soil nutrient levels through lab analysis.

Tim and Becky know that dealing with soil compaction goes beyond just planting deep-rooted cover crops. They have plans to use reduced tillage practices, and create permanent beds and living walkways in order to minimize soil compaction. All these measures will contribute to a healthier soil structure. At OFRF, we are excited to be a part of the Colby’s learning journey, and hope that their work will inspire more farmers to conduct research trials on their farms. 

This story is part of a series profiling farmers who are taking part in OFRF’s Farmer Led Trials (FLT) program. Farmers receive technical support from OFRF to address their challenges through structured on-farm trials. To learn more about OFRF Farmer Led Trials Program, visit our website page at https://ofrf.org/research/farmer-led-research-trials/