Exceptionally dry conditions this summer will result in low crop yield in much of Iowa, and weather forecasts call for normal or below normal rainfall through the fall. These dry conditions and low yields will significantly reduce phosphorus (P) and potassium (K) removal with crop harvest, and may also affect soil test P, K and pH results, complicating test interpretations.
Iowa State University
Mallarino, Antonio P. and Sawyer, John E., "Phosphorus, Potassium and pH Management Issues Following Drought-damaged Crops" (2013). Integrated Crop Management News. 122.
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