MRTN Helps Farmers Optimize Nitrogen Use

By Scout Nelson

The latest episode of the Advancing Nitrogen Smart Podcast explores the Maximum Return to Nitrogen (MRTN) method — a science-based approach designed to help farmers determine the most efficient and cost-effective nitrogen (N) rate for crop production.

Hosted by Brad Carlson, Extension educator from Mankato, and Daniel Kaiser, Extension nutrient management specialist from St. Paul, the discussion breaks down how MRTN works and why it was developed. The goal is to help producers balance economic return and environmental responsibility through smarter fertilizer use.

The MRTN method differs from traditional models that focus solely on maximum yield. Instead, it identifies the nitrogen rate that provides the highest economic return per acre, considering fertilizer costs and expected crop prices.

“The MRTN helps producers understand when additional nitrogen stops increasing profit,” Carlson explains, emphasizing the importance of data-driven decision-making.

Kaiser adds that understanding the differences between an N investment model and a maximum yield model is critical for achieving profitability and sustainability. He encourages farmers to use available tools like the Corn Nitrogen Rate Calculator (www.cornnratecalc.org) to fine-tune their fertilizer applications.

Listeners will also hear insights on how Minnesota farmers and ag professionals can access MRTN resources through the University of Minnesota Extension. The podcast episode outlines where to find updated nitrogen recommendations and how to adjust them for changing soil and weather conditions.

“Knowing the right nitrogen rate saves money, protects water quality, and supports long-term soil health,” Kaiser says.

The Advancing Nitrogen Smart Podcast is supported by farm families in Minnesota through the Minnesota Corn Check-Off Program. Farmers and professionals can subscribe to the Nutrient Management Podcast and Minnesota Crop News for regular updates, or email nutmgmt@umn.edu for more information.

To listen to all episodes, visit the Advancing Nitrogen Smart webpage and learn more about efficient nitrogen practices shaping Minnesota agriculture.

Photo Credit:gettyimages-fertnig