EDITOR’S NOTE: This press release has been updated from a version published on June 1, 2021 to include a recording of the webinar.
AMES, Iowa — Phosphorus loss with surface runoff from corn and soybean fields is the topic of the Iowa Learning Farms webinar recorded June 9.
Research has demonstrated that no-tillage and cover crops are very effective conservation practices to reduce soil erosion and sediment-bound phosphorus (P) loss from agricultural fields. However, research in other states has shown that these practices may not reduce and may even increase loss of dissolved P with surface runoff compared with tillage or no use of cover crops.
Although dissolved P is often a minor proportion of the total P in runoff when compared to the sediment-bound P fraction, it is the most effective P fraction at causing water quality impairment. Antonio Mallarino, professor and extension specialist in the Department of Agronomy at Iowa State University, shares Iowa field research results that evaluated the effects of these management practices on soil, total P, and dissolved P with surface runoff.
Mallarino’s research focuses on soil fertility, nutrient management, and impacts of management practices on phosphorus loss from crop fields and water quality.
Archived webinars are available at https://www.iowalearningfarms.org/page/webinars.
About Iowa Learning Farms
Established in 2004, Iowa Learning Farms is building a Culture of Conservation by encouraging adoption of conservation practices. Farmers, researchers and ILF team members are working together to identify and implement the best management practices that improve water quality and soil health while remaining profitable. Partners of Iowa Learning Farms include the Iowa Department of Agriculture and Land Stewardship, Iowa State University Extension and Outreach, Leopold Center for Sustainable Agriculture, USDA Natural Resources Conservation Service, and Iowa Department of Natural Resources (USEPA section 319) and GROWMARK, Inc.
Hilary Pierce Jacqueline Comito
Extension Outreach Specialist ILF Program Director
— Iowa Learning Farms
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