Long-Term Potassium Fertilization Effects on Yield of Corn and Soybean in South Central Iowa

Date
2017-01-01
Authors
Mallarino, Antonio
Oltmans, Ryan
Piekema, Nicholas
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Research Projects
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Agronomy
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Extension and Experiment Station PublicationsAgronomy
Abstract

Extensive research has been conducted in Iowa to study the potassium (K) fertilization of corn and soybean, but not in south-central Iowa soils. Soil K deficiency decreases crop yield and economic benefits to growers. Also, research in other locations has shown that a K deficiency can reduce the capacity of corn to respond to nitrogen (N) and can increase the incidence of some soybean diseases. Therefore, a long-term K response study was initiated in 2009 at the McNay Research and Demonstration Farm to study corn and soybean response to K fertilizer.

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