Phosphorus and Potassium Fertilization for Corn and Soybean During 40 Years in Northeast Iowa Final Study Report, September 2024
- Antonio P. Mallarino (Iowa State University)
- Ken T. Pecinovsky (Iowa State University)
Abstract
Long-term experiments for phosphorus (P) and potassium (K) have been conducted Iowa State University (ISU) research farms to complement short-term trials on farmers' fields because they allow for the study of yield and soil-test values trends over time. A trial was established at the ISU Northeast Research and Demonstration Farm in 1979 by the late researcher Dr. John Webb and farm superintendent Ken Ross to study effects of P and K fertilization on soil-test values and grain yield of corn and soybean. This report summarizes results through the end of 2018 when the trial was discontinued.
How to Cite:
Mallarino, A. P. & Pecinovsky, K. T., (2025) “Phosphorus and Potassium Fertilization for Corn and Soybean During 40 Years in Northeast Iowa Final Study Report, September 2024”, Iowa State University Research and Demonstration Farms Progress Reports 2024(3), 46-50.
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