Sampling soil this fall following the dry conditions this past summer, and in some places continuing up to this time, may result in lower than expected soil-test results for phosphorus (P), potassium (K), and pH. Especially if soil samples are collected before any significant rainfall. Therefore, farmers and crop consultants should interpret those soil-test results with caution.
Iowa State University
Mallarino, Antonio and Sawyer, John E., "Be Cautious When Interpreting Fall Soil-Test Results Following Drought" (2020). Integrated Crop Management News. 2664.
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