Soil-Test Interpretations for Fall Fertilization and Liming Decisions with High Fertilizer Prices and After Highly Variable Rainfall and Crop Yields
The 2021 cropping season had very variable rainfall across Iowa with either drought or excessive rainfall. Highly variable landscape and soil moisture retention capacity in many fields also may cause high within-field yield variability. Reduced potential income due to low yield in some areas combined with currently very high fertilizer prices are creating significant uncertainty among producers about P, K, and liming decisions for the 2022 crop season. Several factors need to be considered.