P and K Guidelines

University of Minnesota Extension’s two-day field School for Ag Professionals is coming up July 29 and July 30, 2026. If you’re an agronomist, a retailer, dealer or consultant, if you’re a summer field scout - we encourage you to attend these small-group, hands-on sessions led in the field by experienced instructors. 12 Certified Crop Advisor CEUs credits are available! For all the details, including info on lodging, visit z.umn.edu/AgFieldSchool2026In this episode, 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?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 guidelinesIowa State University - soil fertilityKansas State University - soil fertility recommendationsIs 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 soil5 tips for cutting phosphorus, potassium fertilizer costs---For the latest nutrient management information, subscribe to the Nutrient Management Podcast wherever you listen and never miss an episode! 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 Twitter, and visit our website.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