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ISU Virtual Field Day Series is now available on YouTube

September 8, 2020 10:22 AM
Blog Post

ISU Extension and Outreach and the College of Agriculture and Life Sciences recently hosted a “five-stop” virtual field day series. This series featured a greeting by Dean Dan Robison, an administrative update on the farms, and four consecutive days featuring water quality research, fungicide trials, a long-term tillage trial and phosphorous and potassium placement trials for crop production.   

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Sidedressed Liquid Potassium Can Partially Offset Deficient Preplant Fertilization for Corn

May 22, 2020

Iowa State University (ISU) research has evaluated corn and soybean response to preplant potassium (K) fertilizer placement methods and starter since the middle 1990s. These results have been used for developing guidelines in Extension publication PM 1688. In recent years, excessive fall and spring rainfall sometimes has precluded the normal K preplant fertilization. Therefore, growers and crop consultants have been asking if sidedressed liquid K fertilizer could alleviate deficiency or be a good complement to preplant K fertilization, as is commonly the case for nitrogen.

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Phosphorus and Potassium Management for 2020 after a Year with Highly Variable Yields

October 1, 2019
Net returns to P or K fertilization of corn and soybean for different soil-test levels in many Iowa soils for shown prices

Very variable weather this season will result in variable corn and soybean yield within and between fields. Entire fields or portions of fields were planted later than usual or were not planted. This will result in variable removal of phosphorus (P) and potassium (K) with harvest. Reduced yields combined with continued low market values create uncertainty about P and K fertilization decisions for the 2020 season.

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