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P and K fertilizer guidelines: Why do they differ from state to state?

fertilizer applicator
In this episode of the Nutrient Management Podcast, we’re talking about phosphorus and potassium guidelines. Why do P and K guidelines differ from state to state? What is the best way to collect soil samples, and are there benefits from grid sampling? Are there any new technologies out there that may replace soil testing in the future? 



  • Daniel Kaiser, nutrient management specialist (St. Paul)
  • Jeff Vetch, nutrient management specialist (Waseca)
  • Antonio Mallarino, soil fertility and nutrient management specialist (Iowa State University)
  • Dorivar Ruiz Diaz, soil fertility specialist (Kansas State University)

Additional resources:


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