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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.
How to use this site
Welcome to the Iowa State University Agronomy Extension Soil Fertility Home Page. Nutrient topics are listed in the drop down menu. Simply click on a topic of interest and you can find information about that topic, including Extension publications, newsletter articles, conference proceedings and reports, presentations, and links to other related sites. Links also provide access to soil fertility decision aid tools, and a photo gallery.