True value of cover crops to farmers, environment

True value of cover crops to farmers, environment

Planting cover crops in rotation between cash crops — widely agreed to be ecologically beneficial — is even more valuable than previously thought, according to a team of agronomists, entomologists, agroecologists, horticulturists and biogeochemists. The research quantified the benefits offered by cover crops across more than 10 ecosystem services. Benefits included increased carbon and nitrogen in soils, erosion prevention, more mycorrhizal colonization — beneficial soil fungus that helps plants absorb nutrients — and weed suppression.

via Agriculture and Food News — ScienceDaily:

Planting cover crops in rotation between cash crops — widely agreed to be ecologically beneficial — is even more valuable than previously thought, according to a team of agronomists, entomologists, agroecologists, horticulturists and biogeochemists from Penn State’s College of Agricultural Sciences.”As society places increasing demands on agricultural land beyond food production to include ecosystem services, we needed a new way to evaluate ‘success’ in agriculture,” said Jason Kaye, professor of biogeochemistry. “This research presents a framework for considering a suite of ecosystem services that could be derived from agricultural land, and how cover crops affect that suite of services.”Cover cropping is one of the most rapidly growing soil and water conservation strategies in the Chesapeake Bay region and one we are really counting on for future improvements in water quality in the bay. Our analysis shows how the effort to improve water quality with cover crops will affect other ecosystem services that we expect from agricultural land.”The research, published in the March issue of Agricultural Systems, quantified the benefits offered by cover crops across more than 10 ecosystem services. Benefits included increased carbon and nitrogen in soils, erosion prevention, more mycorrhizal colonization — beneficial soil fungus that helps plants absorb nutrients — and weed suppression.Lead researcher Meagan Schipanski explained that commonly used measurements of ecosystem services can be misleading due to the episodic nature of some services and the time sensitivity of management windows.”For example, nutrient-retention benefits occur primarily during cover crop growth, weed-suppression benefits occur during cash-crop growth through a cover crop legacy effect, and soil-carbon benefits accrue slowly over decades,” she said. “By integrating a suite of ecosystem services into a unified analytical framework, we highlighted the potential for cover crops to influence a wide array of ecosystem services. We estimated that cover crops increased eight of 11 ecosystem services. In addition, we demonstrated the importance of considering temporal dynamics when assessing management system effects on ecosystem services.”Trade-offs occurred between economic metrics and environmental benefits, said Schipanski, who was a postdoctoral scholar at Penn State when she led the cover crop study. Now an assistant professor in the department of soil and crop sciences at Colorado State University, she noted that the planting of cover crops will become more attractive if fertilizer prices rise or if modest cost-sharing programs like the one currently in place in Maryland are developed.Researchers simulated a three-year, soybean-wheat-corn rotation with and without cover crops in central Pennsylvania, which presented agroecological conditions broadly representative of the Northeast and mid-Atlantic regions. The cover crop rotation included red clover, frost-seeded into winter wheat in March, and winter rye, planted after corn was harvested in the fall. The research, funded by the U.S. …

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Agriculture and Food News — ScienceDaily

True value of cover crops to farmers, environment

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