McNay Research and Demonstration Farm
Research has been conducted in Iowa to investigate potassium (K) fertilization of corn and soybean, but not at this farm. Insufficient K amounts in the soil or applied with fertilizer or manure significantly decreases crop yield end economic benefits to growers. Also, research in other locations has shown large soil-test K temporal variability within a season or from the fall to spring. Therefore, a study was initiated in 2009 to investigate these issues
Iowa State University
Mallarino, Antonio P.; Oltmans, Ryan R.; and Piekema, Nicholas, "Potassium Fertilizer Effects on Yield of Corn and Soybean and on Potassium Uptake and Recycling to the Soil" (2013). Iowa State Research Farm Progress Reports. 1920.