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 [email protected] 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.

Today on the Advancing Nitrogen Smart podcast we speak in-depth about the recently-revised Minnesota Nutrient Reduction Strategy with Matt Drewitz from the Minnesota Pollution Control Agency. What are the goals of the MN Nutrient Reduction Strategy, and how are they being addressed specifically? Are we on track to meet our objectives? How have environmental changes over the years affected our progress? How have wastewater treatment plants contributed to the effort, and what have we learned from them? What kinds of other practices can be leveraged to meet the goals of the NRS, and how should farmers approach these ideas? Who's a farmer's point of contact with questions about adopting these practices? All of this on today's episode, recorded on the road from the recently held Nutrient Management Conference in Mankato, MN.Guests:Brad Carlson, Extension educator (Mankato)Matt Drewitz Minnesota Pollution Control Agency, (St. Paul)Additional resources:Minnesota Nutrient Reduction StrategyOne Watershed, One PlanAddressing nitrate in southeastern MinnesotaThe state of Minnesota's soil health: How many farmers are doing no-till, cover crops, and moreEdge of field N and P reduction strategies: What to know about conservation drainage practicesVideos of the 2026 Nutrient Management and Nitrogen Conference presentations are now available---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 [email protected] Nitrogen Smart is proud to be supported by the farm families of Minnesota and their corn check-off investment through Minnesota Corn.

Today we’re going on the road with a conversation recorded during the Minnesota Association of Social and Water Conservation Districts' (MASWCD) annual conference. Mike Schultz, district manager at the Le Sueur County SWCD talks with Brad Carlson about actual methods of incorporating conservation practices into the landscape. What are general categories of conservation practices? How are watershed plans written, and how do they address a balanced set of interests? Which practices tend to appeal to farmers the most? What kinds of resources can a County SWCD provide? What are some examples of successful implementation? Are there cost-share programs available - and if so how do farmers find them? All that and more on today's episode of the Advancing Nitrogen Smart Podcast.Guests:Brad Carlson, Extension educator (Mankato)Mike Schultz, district manager, Le Sueur SWCD Additional resources:Le Sueur County SWCDSoil and Water Conservation District Directory MN SWCDs (from the MN Board of Soil and Water Resources)Minnesota Nutrient Reduction StrategyNitrogen SmartOne Watershed, One Plan---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 [email protected] Nitrogen Smart is proud to be supported by the farm families of Minnesota and their corn check-off investment through Minnesota Corn.

Today on the Nutrient Management Podcast we discuss all things manure as we head into spring. Our three manure nutrient management specialists and researchers talk about recent updates to ManureDB (the online manure database). Why was ManureDB created, and what makes it a helpful tool for farmers and producers? What's the status of current and future manure research projects? How can Minnesota farmers partner with the University of Minnesota manure team for on-farm research projects? What are some top-of-mind best practices for sampling and safety as we head into the growing season? All of that and much more on today's show.Guests:Melissa Wilson, Extension manure nutrient management specialist (St. Paul)Eduardo Garay Lagos, manure research manager (St. Paul)Nancy Bohl Bormann, manure nutrient management researcher (St. Paul)Additional Resources:Introducing ManureDB: A new way to view manure variability and trends Manure ManagementHow to put together a manure management plan'Manure is complicated': 5 Reasons you need a manure management planManure sampling and testing: Variability, guidelines & safety for your operation—

Today on the show we join a panel of 5 specialists, practitioners, Extension educators to discuss nitrates and water quality in southeast Minnesota. What is the current situation with nitrates and water quality in southeast Minnesota? Is the situation improving over time? What are some key factors affecting nitrate concentrations? What should growers in the region be thinking about in terms of nitrogen best management practices? What are some other ways that farmers in southeast Minnesota can help improve water quality? What else should we be thinking about related to N BMPs and nitrate water quality issues in southeast Minnesota? What resources (financial and otherwise) are available to farmers in southeast Minnesota? All this and much more today's Nutrient Management Podcast from University of Minnesota Extension. Video of this podcast is available on our YouTube channel! Watch it here. Guests:Mary Nesberg, Extension educator (Rochester)Daniel Kaiser, Extension nutrient management specialist (St. Paul)Brad Carlson, Extension educator (Mankato)Kevin Kuehner, Hydrologist, Minnesota Department of Agriculture (Preston)Jeff Vetsch, U of M researcher (Waseca)Additional Resources:Improved understanding of groundwater age and nitrate trendsGreenCovR: Cover crop management tool provides local information on green cover achieved by managementMinnesota Agricultural Water Quality Certification ProgramTap-In: Safe Drinking Water for SE MinnesotaGrain Gathering 2026 Olmested County SWCDCorn Nitrogen Rate CalculatorMinnesota Nutrient Reduction StrategyNitrates and drinking water: Resources for southeast Minnesota well users, farmersSoutheast Minnesota nitrogen meeting presentations now available onlinez.umn.edu/NitrogenSmartAddressing nitrate in southeastern MinnesotaExtension addresses nitrate water quality issues in southeast MinnesotaWhat decade are we measuring? Improved understanding of groundwater age and nitrate trends (YouTube video)

We return to first principles with a detailed discussion about nitrogen loss on today's Advancing Nitrogen Smart Podcast episode. The five terms that describe how nitrogen is lost from the soil are: leaching, denitrification, volatilization, crop removal and soil erosion & runoff. But what do those terms actually mean? How does nitrogen's chemistry change during loss? Do N loss processes (also called pathways) happen at the same speed? How do temperature and precipitation affect N loss pathways? How might farmers hedge against the risk of loss by incorporating the 4Rs into their N planning? All of this and much more on today's show.GuestsBrad Carlson, Extension educator (Mankato)Dan Kaiser, Extension nutrient management specialist (St. Paul)Additional resourcesNitrogen Conference (held annually in February; past videos are available online)Four things I’ve learned about nitrogen management for corn based on a decade of research in MinnesotaNitrogen Nuggets (YouTube playlist)Understanding nitrogen in soilsNitrogen Smart---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 [email protected] Nitrogen Smart is proud to be supported by the farm families of Minnesota and their corn check-off investment through Minnesota Corn.

It's December and we're rounding out the year with an in-depth discussion on cover crops here on the Nutrient Management Podcast. What are panelists' observations regarding covers with lower seeding rates? What are some pros and cons relating to erosion or nutrient uptake? Does planting early at a lower seed rate vs. planting later with a higher seed rate result in the same outcome? What are some weed control characteristics of cover crops? What advice do our panelists have for farmers new to cover crops? What kinds of state and local resources are available for growers? All this and lots more on today's show so be sure to tune in.Guests:Anna Cates, Extension soil health specialist (St. Paul)Ryan Beutow, Minnesota NRCS State Agronomist (St. Paul)Eric Yu, Extension educator (Farmington)Additional Resources:UMN Cover Crops row cropsUMN Cover crops in vegetablesCover crop AcademyMN Agronomy Technical Note 33Single species cereal rye cover crop implementation requirementsCover Crop Termination GuidelinesMN NRCS Cover Crop Design ToolMidwest Cover Crop CouncilSARE Managing Cover Crops ProfitablyMN Field Office Technical Guide folder on cover crops--- 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 [email protected] 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.

Today on the Nutrient Management Podcast we're turning our attention to micronutrients. What does current research tell us about micronutrients - for corn specifically - that growers need to consider? Boron is another important micronutrient in Minnesota. What should farmers be aware of regarding boron? Is tissue sampling the answer to help predict where some of these micronutrients are needed? What are other important micronutrient takeaways? All this and much more on today's episode. Guests & Contact Info:Jeff Vetsch, U of M researcher (Waseca) - email: [email protected] Kaiser, Extension nutrient management specialist (St. Paul) - email: [email protected] Rosen, Extension nutrient management specialist (St. Paul) - email: [email protected] Resources:Micro- and secondary macronutrientsUnderstanding plant analysis for cropsZinc for crop productionAre you overspending on fertilizer?Is boron deficiency a problem for crops in Minnesota?---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 [email protected] 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.

On today's episode of the Advancing Nitrogen Smart podcast, Brad and Dan talk about variable rate application - and zones in particular. What's the overall point to variable rate N application? How might an initial starting N rate be determined? How do farmers' fields and equipment introduce their own variables, and how can these variables be monitored? How should farmers think about - and plot out - field zones? What's the difference between a yield map and a zone map, and should farmers rely on yield maps for zoning purposes? Do the best yielding spots always need the most nitrogen? All of this and much more on today's show.Guests:Brad Carlson, Extension educator (Mankato)Dan Kaiser, Extension nutrient management specialist (St. Paul)Additional resources:With high nitrogen fertilizer prices and low corn prices, can you decrease your nitrogen rate for 2026? www.cornnratecalc.org (Corn Nitrogen Rate Calculator)Is variable rate nitrogen based on yield maps a good idea?Variable rate nitrogen: What are we trying to accomplish?Brad Carlson's email address: [email protected] Kaiser's email address: [email protected] 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 [email protected].

This month on the Nutrient Management Podcast, we talk about a recent increase in N rate recommendations for corn. Why have these suggested nitrogen rates for corn increased over time? How are regional differences across Minnesota factored into this increase? Why does the Maximum Return to Nitrogen (MRTN) method of N rate calculation bring economics into the mix? Why should growers focus on profit instead of yield? Won't a higher nitrogen rate make our SE Minnesota water issues worse? Our panelists answer these important questions - and many more - on today's show.Guests:Jeff Vetsch, U of M researcher (Waseca)Daniel Kaiser, Extension nutrient management specialist (St. Paul)Brad Carlson, Extension educator (Mankato)Additional Resources:www.cornnratecalc.org (N Rate Calculator)Updated corn nitrogen rates: What are we currently seeing for N fertilizer requirements in Minnesota?An introduction to MRTN: Efficiencies & economics in mind2025 fall fertilizer outlook: Management tips during economic uncertaintyWith high nitrogen fertilizer prices and low corn prices, can you decrease your nitrogen rate for 2026?---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 [email protected] 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.