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Cover crops provide many benefits in tillage-intensive, high-input cropping vegetable production by adding carbon-rich, organic matter to the soil. But some types of biomass can create management challenges for growers if a cover crop produces viable seed that can be a weed in subsequent vegetable systems or fallow beds. Using the Feekes scale for cereal development is a practical way to know when to best terminate a cover crop to maximize good biomass (roots, stems, leaves, and immature seed heads) and prevent bad biomass (viable seed). This video provides data on good versus bad cover crop biomass from Merced rye (Secale cereale) from a 2-year study comparing over winter versus fall-terminated cover crops in rotation with vegetable (lettuce) production. Merced rye is a spring-type rye meaning that it doesn't require vernalization. Fall-terminated cover crops are attractive to growers because they allows them to leave beds fallow over the winter which can simplify late winter or early spring vegetable plantings. In our study fall-terminated rye cover crops were grown for approximately 60 or 90 days and left as winter fallow beds. These two treatments are compared with over-wintered cover crops and a system with no cover crops. This study is managed by Dr. Eric Brennan at the USDA-ARS organic research farm in Salinas, California (The Salad Bowl of America) in collaboration with Ph.D. students Anna Gomes and Sierra Castaneda of Stanford University. This video is the second in a series of videos that we will make to describe this novel study. The first video (Fall terminated versus Winter Cover Crops to Reduce Nitrate Leaching in California) is available here • Fall terminated versus Winter Cover Crops ... Feekes scale publications. Broeske et al. 2020. Visual Guide to Winter Wheat. Development AGrowth Staging, Univ. Wisc. (72 page guide) https://www.ars.usda.gov/ARSUserFiles... Lollato R. 2018. Wheat Growth and Development, Kansas State Univ. (1 page guide) https://www.ars.usda.gov/ARSUserFiles... Related blog article from 2022. Smith, Brennan & Lundy. 2022. The risk of seed set by cover crops, Salinas Valley Agriculture Blog. https://ucanr.edu/blog/salinas-valley...