Agricultural Engineering/Agronomy, Central Iowa, and BioCentury Research Farms

Potassium Effects on Yield of Corn and Soybean and on Potassium Uptake and Recycling to the Soil

Authors: Antonio P. Mallarino (Iowa State University) , Ryan R. Oltmans (Iowa State University) , Michael W. Fiscus (Iowa State University)

Abstract

Considerable research has been conducted in central Iowa to study potassium (K) fertilization rates and placement methods on corn and soybean grain yield, K uptake, and soil-test K values. However, no research has investigated K recycling to the soil by maturing plants and crop residue until the next crop is planted. The amount and the timing of the K recycled to the soil should have a significant impact on soil-test K values, and should explain a great deal of usually very high soil-test K temporal variability. Therefore, plots of several field K trials in central Iowa were used to investigate these issues.

Keywords: RFR A12129, Agronomy

How to Cite: Mallarino, A. P. , Oltmans, R. R. & Fiscus, M. W. (2013) “Potassium Effects on Yield of Corn and Soybean and on Potassium Uptake and Recycling to the Soil”, Iowa State University Research and Demonstration Farms Progress Reports. 2012(1).