Phosphorus: Rate guidelines, sources & best practices for Minnesota, Midwest farmers

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 soilsVideos of the 2026 Nutrient Management and Nitrogen Conferences are now availablePhosphorus fertilizer sources: What are the differences and which one should you use?Is 'fixed' P lost? 4 things to considerMinnesota Nutrient Reduction Strategy--For the latest nutrient management information, subscribe to the Nutrient Management Podcast. And don't forget to subscribe to the Minnesota Crop News daily or weekly email newsletter, subscribe to our YouTube channel, like UMN Extension Nutrient Management on Facebook, follow us on X (formerly twitter), and visit our website.If you have questions or comments, please email us at nutmgmt@umn.edu.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.