Podcast: Variable rate technology: How should farmers evaluate outcomes?


In this episode of the Nutrient Management Podcast, we’re talking about variable rate technology. What are some reasons that farmers might want to use variable-rate fertilizer instead of applying a single rate? Is there a difference between variable-rating different nutrient types? What are the technologies that are used to prescribe variable-rate fertilizer and what is the theory behind them? If farmers apply fertilizer at a variable rate, how should they evaluate those outcomes?


  • Brad Carlson, Extension educator (Mankato)
  • Daniel Kaiser, Extension nutrient management specialist (St. Paul)
  • Jeff Vetch, Extension nutrient management researcher (Waseca)