Today on the Nutrient Management Podcast we discuss phosphorus with experts from Minnesota and across the Midwest. Why are Midwest phosphorus guidelines different from state to state? Are Minnesota's current P guidelines satisfactory - or do states' P guidelines need revision? Would a P-rate calculator that incorporates economics be a useful tool, similar to nitrogen's MRTN calculator? What 'Phosphorus & the 4R's' tips and suggestions do our Minnesota, Ohio, Illinois and South Dakota panelists recommend for area farmers? Nitrates and water quality issues continue to be top-of-mind - would switching P sources be beneficial? What new and ongoing phosphorus-related research projects are panelists watching? All this and much more on today's show.

Guests:

• Daniel Kaiser, Extension nutrient management specialist (St. Paul)
• John Jones, soil fertility, plant nutrition, and nutrient management research, University of Illinois Urbana-Champaign (Champaign, IL)
• Jason Clark, Extension soil fertility specialist, South Dakota State University (Brookings, SD)
• Manbir Rakkar, assistant professor, soil fertility and nutrient management, The Ohio State University (Brewster, OH)

Additional resources:

• Understanding phosphorus in Minnesota soils
• Videos of the 2026 Nutrient Management and Nitrogen Conferences are now available
• Phosphorus fertilizer sources: What are the differences and which one should you use?
• Is 'fixed' P lost? 4 things to consider
• Minnesota Nutrient Reduction Strategy

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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.