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

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? 

Transcript

Guests:

• 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:

• University of Minnesota - corn fertilizer guidelines
• Iowa State University - soil fertility
• Kansas State University - soil fertility recommendations
• Is build-and-maintain a viable strategy for crop nutrient management?
• What is the best soil test option for phosphorus?
• Nutrient Management Podcast: Optimal P and K levels in the soil
• 5 tips for cutting phosphorus, potassium fertilizer costs

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Support for the Nutrient Management Podcast is provided by Minnesota's fertilizer tonnage fee through the Agricultural Fertilizer Research & Education Council (AFREC). Learn more at MNsoilfertility.com.