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?

Guests:

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

Additional resources:

• Variable rate nitrogen and nitrogen advisory tools: Do they work?
• Fertilizer recommendation technology: What is success?
• On-farm precision ag research update: In-season site-specific side-dress nitrogen rate recommendations for corn