McNay Memorial Research and Demonstration Farm
Authors: Antonio P. Mallarino (Iowa State University) , Louis B. Thompson (Iowa State University) , Gary Thompson (Iowa State University) , Nicholas Piekema (Iowa State University)
Previous Iowa State University (ISU) research has assessed the corn and soybean grain yield response to potassium (K) fertilizer placement methods using granulated potash fertilizer (0- 0-62). However, no study had evaluated K sidedressing, although postemergence sidedressing of nitrogen for corn is a common practice. Mainly because of low grain prices, farmers and crop consultants have been asking if K sidedress could be of value to increase corn and soybean yield and perhaps reduce the preplant K application rate. Therefore, a study was initiated at this farm in 2017 to evaluate the value of sidedressed liquid K fertilizer for corn and a following soybean crop. Last year a report summarized the results of corn trials conducted in 2017 and 2018 at this farm. This report summarizes results for soybean trials conducted in 2018 and 2019.
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How to Cite: Mallarino, A. P. , Thompson, L. B. , Thompson, G. & Piekema, N. (2020) “Soybean Yield and Leaf Potassium Responses to Sidedressed Liquid Potassium Fertilizer in Southern Iowa”, Iowa State University Research and Demonstration Farms Progress Reports. 2019(1).