Resource Roundup
May 27, 2026 | Puyallup, WA
A field tour and grower panel discussion focused on building soil health in diversified vegetable cropping systems with reduced tillage and animal integration.
Session 1: Soil Health in Reduced Tillage and Animal Integrated Diversified Organic Cropping Systems
Doug Collins, Washington State University
Key Takeaways
- WaSHI's long-term study compares intensive tillage, reduced tillage, and animal-integrated organic vegetable systems within a three-year crop rotation.
- Compost applications reduced soil bulk density and significantly increased mineralizable carbon, indicating improved biological activity.
- Reduced tillage showed trends toward improved soil aggregation, although differences were not yet statistically significant.
- Compost increased several soil nutrients and improved broccoli yields, particularly when applied shortly before transplanting.
- Early results showed lower broccoli and squash yields under reduced tillage compared with intensive tillage, highlighting potential tradeoffs during transition periods.
Resources
Session 2: Managing for the Legume: Evaluating Nutrient Status on Cover Crop Legumes and Pasture Leys
Stephen Bramwell, Washington State University
Key Takeaways
- Researchers are investigating how liming and micronutrient amendments influence pasture establishment and legume performance.
- Nitrogen fixation by legumes depends on adequate availability of essential nutrients, including sulfur, magnesium, zinc, boron, and copper.
- Several micronutrients play direct roles in root nodule formation, rhizobium activity, and biological nitrogen fixation.
- Dolomite, sulfur, and micronutrient applications were evaluated as tools to improve legume growth and nutrient function compared with untreated and lime-only treatments.
- Nutrient deficiencies can limit nitrogen fixation even when legumes are successfully established.
Resources
Session 3: Cover Crop Biofuels Research
Teal Potter, Washington State University
Miki Santosa, Pacific Northwest National Laboratory
Key Takeaways
- This project evaluates cover crop growth and biomass production across multiple Washington growing regions.
- Economic analyses compare the costs of cover crop establishment and management alongside cash crop production.
- Biomass yield varies considerably by location and cover crop treatment, affecting both agronomic and economic outcomes.
- The project explores whether cover crop biomass can serve as a low-carbon biofuel feedstock while maintaining soil health benefits.
- Research focuses on understanding tradeoffs between retaining residue for soil improvement and removing biomass for energy production.
Resources
Session 4: Reduced Tillage and Tarping vs. Intensive Tillage Without Tarping
Doug Collins, Washington State University
Samantha Shortledge, Washington State University
Joseph Zimbric, Washington State University
Key Takeaways
- The project evaluates whether combining reduced tillage with temporary silage tarps can improve organic sweet corn production.
- In a 2024 field trial, reduced tillage plus tarping increased sweet corn yield by 48% and marketable ear production by 51% compared with intensive tillage without tarping.
- Weed suppression provided by tarps may help reduce some of the challenges typically associated with reduced-tillage systems.
- Ongoing research is measuring soil temperature, soil moisture, and nitrogen availability during the tarping period.
- Practical adoption considerations include the labor required to install and remove tarps, along with concerns about potential plastic contamination.
Resources
Session 5: Producer Presentations
and Producer Panel Discussion
Jen Aron, Blue Raven Farm
Phelan Pagano, Little Big Farm
Matt Steinman, Foothills Farm
Key Takeaways
- Successful reduced-tillage systems are highly site-specific, with farmers emphasizing optimization of disturbance rather than strict adherence to no-till practices.
- Diverse cover crops, continuous living roots, and long crop rotations were repeatedly identified as the foundation of soil health, weed suppression, and long-term productivity.
- Healthy soils can reduce pest and disease pressure over time, but some growers still use targeted tillage to manage challenges such as symphylans, nematodes, and other soil-borne pests.
- Farmers expressed skepticism about single soil-health solutions and emphasized using multiple tools—including soil tests, tissue analyses, field observations, and experimentation—to guide management decisions.
- Climate resilience emerged as a major theme, with cover crops, soil cover, strong soil biology, and water management viewed as critical strategies for coping with extreme heat and other weather stresses.
- The panel generally defined regenerative agriculture as continuous improvement of soil, ecosystem, and farm health, while cautioning that regenerative practices must also remain practical and economically sustainable.
Resources
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