McNay Research and Demonstration Farm
Crops and Soils
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.
Mallarino, Antonio; Oltmans, Ryan R.; and Piekema, Nicholas
"Long-Term Potassium Fertilization Effects on Yield of Corn and Soybean in South Central Iowa,"
Farm Progress Reports: Vol. 2016
, Article 186.
Available at: http://lib.dr.iastate.edu/farmprogressreports/vol2016/iss1/186