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Fall Phosphorus and Potassium Fertilization Decisions with Variable Prices and Updated Soil-Test Interpretations

Antonio Mallarino, Professor and Nutrient Management Extension Specialist, Department of Agronomy, Iowa State University
September 21, 2023

Decisions for phosphorus (P) and potassium (K) fertilization should consider the slightly lower but still fluctuating crop and fertilizer prices compared with last year and very variable rainfall across the state. The current or expected crop and fertilizer prices after harvest and the yield level this harvest have a major impact on producers' fertilization decisions.

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