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PODCAST

UMN Extension Nutrient Management Podcast

University of Minnesota Extension

Welcome to University of Minnesota Extension"s Nutrient Management Podcast. Each month we bring you the latest research in nutrient management for crops and how you can incorporate the latest tips and best management practices to your farm.

science natural sciences

All Episodes

21:48

Active sensors & variable rate nitrogen: What MN...

UMN Extension Nutrient Management Podcast ·

2026/03/26

Brad Carlson and Jeff Vetsch talk about variable rate sensors on today's Advancing Nitrogen Smart Podcast episode. What is meant by the term 'active sensors' and what data do active sensors capture? Which specific brands of sensors have the Southern Research and Outreach Center (SROC) researched, and how did they perform? What stage does corn need to reach before sensors can best contribute to variable rate decision making? How do other field variables like soil texture or irrigation

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39:36

Phosphorus: Rate guidelines, sources & best practices...

UMN Extension Nutrient Management Podcast ·

2026/03/17

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

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20:43

Minnesota's Nutrient Reduction Strategy: Practices,...

UMN Extension Nutrient Management Podcast ·

2026/03/09

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

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18:01

Incorporating conservation practices: County SWCDs,...

UMN Extension Nutrient Management Podcast ·

2026/02/25

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

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24:29

Looking ahead to spring manure: ManureDB, research...

UMN Extension Nutrient Management Podcast ·

2026/02/23

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

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49:15

Nitrogen BMPs and nitrate water quality issues in...

UMN Extension Nutrient Management Podcast ·

2026/01/26

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

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42:48

The 5 main pathways of nitrogen loss: What are they,...

UMN Extension Nutrient Management Podcast ·

2026/01/12

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

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23:23

All about cover crops: Lower seeding rates, weed...

UMN Extension Nutrient Management Podcast ·

2025/12/11

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

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33:16

Micronutrients: Current research, tissue sampling,...

UMN Extension Nutrient Management Podcast ·

2025/11/24

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

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40:04

Variable rate zones: Field mapping, soil types, tools...

UMN Extension Nutrient Management Podcast ·

2025/11/12

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

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31:13

Updated corn nitrogen rates: Regional differences,...

UMN Extension Nutrient Management Podcast ·

2025/10/22

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

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28:30

An introduction to MRTN: Efficiencies & economics in...

UMN Extension Nutrient Management Podcast ·

2025/10/14

Brad Carlson and Daniel Kaiser discuss the maximum return to nitrogen method (MRTN) for determining an optimal N rate on today's episode of Advancing Nitrogen Smart Podcast. What is the MRTN and why was it created? What are differences between an N investment model versus a maximum yield model? What should farmers keep in mind while using the MRTN? Where can Minnesota farmers, producers and ag professionals find the MRTN? All this and more on today's show.Guests:Brad Carlson, Extension

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38:51

Biological soil fertility products for corn and...

UMN Extension Nutrient Management Podcast ·

2025/09/25

Dan Kaiser and Brad Carlson continue their discussion on N-fixing biostimulant products in today's episode of the Advancing Nitrogen Smart Podcast. What's the most up-to-date working definition of a crop biostimulant? On which crops are N-fixing products typically used? What is NCERA103.org, and in what ways it it a useful resource for farmers and other agricultural professionals? What are some of the different categories of nitrogen-fixing biostimulants? How should farmers be thinking

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31:32

Fall manure application: Plans, resources &...

UMN Extension Nutrient Management Podcast ·

2025/09/09

On this episode of the Nutrient Management Podcast, we talk all about fall manure application. What should be on a farmer's to-do list to prepare for fall application? What names need to be on an operation's emergency response plan, and what kind of PPE should farmers keep nearby? How much lead time does a lab need to return sample results? If a farmer plans to work with a commercial applicator, what can they do ahead of time to ensure a successful season? All of this, plus a farmer

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31:16

Bioreactors in-depth: Carbon sources, incorporation,...

UMN Extension Nutrient Management Podcast ·

2025/08/27

Today on the Advancing Nitrogen Smart Podcast we take a close-up look at bioreactors as an edge-of-field practice. How does this important tool work, and how does it help mitigate nitrate loss? What types of carbon sources have traditionally been used in a bioreactor, and what types of carbon could be used in the future? How are bioreactors incorporated in to a farmer's operation, and how are they maintained? How effective and efficient are bioreactors? What's on the horizon for the next

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35:20

2025 Fall fertilizer outlook: Management tips during...

UMN Extension Nutrient Management Podcast ·

2025/08/19

It’s that time of year again; time for the Fall Fertilizer Outlook on the Nutrient Management Podcast. Given the overall economics of crop production right now, how should farmers be approaching their fertilizer decisions this fall? What are some regional differences with respect to fertilizer management this year? There has been a renewed focus on the issue of water quality in Minnesota - how should this affect farmers’ decision-making? How many fertilizer decisions can be pushed off until

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33:22

Manure laws and regulations in MN: Feedlots, storage,...

UMN Extension Nutrient Management Podcast ·

2025/08/13

On today's Advancing Nitrogen Smart Podcast, Brad Carlson and Melissa Wilson explain aspects of Minnesota laws and regulations that manure applicators should be aware of. What are the requirements for manure testing, and how often should you do it? What are some general restrictions for manure application in Minnesota? How do buffers and setbacks help you? What kinds of documents should be incorporated into a manure management plan? What contingencies should be put into place in the case of

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37:58

How soil conditions & chemistry affect nitrogen loss

UMN Extension Nutrient Management Podcast ·

2025/07/30

Nitrogen loss is the topic today on the Advancing Nitrogen Smart podcast. Soil conditions and chemistry are factors that make nitrogen prone to loss, but how does the N loss process actually happen? What's left over in the field after that process occurs, and where does the lost nitrogen go? What do denitrification, leaching and volatilization mean? How can the 4 Rs (right rate, right source, right placement, right timing) help growers minimize risk? How do nitrification inhibitors,

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28:42

Variable rate nitrogen: What are we trying to...

UMN Extension Nutrient Management Podcast ·

2025/07/17

On this episode of Advancing Nitrogen Smart, Brad and Dan take some of the mystery out of variable rate N. What are we trying to accomplish when we use a variable rate management practice? What kinds of field conditions might benefit from VRN, and which conditions should be avoided with VRN? How might the other 3 R's (Timing, Source & Placement) play a part in rate decision making? All that and more on today's show. Guests:Brad Carlson, Extension educator (Mankato)Dan Kaiser, Extension

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33:03

Nutrient management for irrigated crops in MN: Corn,...

UMN Extension Nutrient Management Podcast ·

2025/07/15

Today on the Nutrient Management Podcast we discuss nutrient management for irrigated crops in Minnesota. How many irrigated acres are there in Minnesota? What are some of the benefits and risks of irrigation? In what ways can risks be mitigated - through timing, cover crop adoption and / or other general soil health practices? What should growers know about the latest irrigation research in Minnesota? If a farmer is considering adopting irrigation practices, what should they focus on

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