Anhydrous ammonia is now over $1,000 per ton, which means there’s a lot more money on the line for farmers compared to previous years. Before you finalize your application rate, it’s worth looking at what a decade of real farm data has to say about the ROI.

More Nitrogen Doesn’t Mean More Profit

This is one of the most consistent findings across 10 years of PCM data: applying more nitrogen per acre does not always translate into higher returns.

In 2024, the average nitrogen application rate across high-productivity Illinois corn fields in PCM hit 208 lbs N/acre — the highest since 2018. But the most profitable range in our dataset was 151–175 lbs N/acre.

At that rate, PCM farmers averaged $355/acre in operator and land return, whereas fields with over 225 lbs/acre averaged $332/acre. That $23/acre difference adds up fast.

Fields applying 225+ lbs averaged higher yields, but those extra bushels didn’t cover the cost of the extra fertilizer. 

Why the discrepancy?

PCM data shows 75% of farmers apply within 10 pounds of the same rate across all their fields, year after year, because managing nitrogen at scale is complex and most production plans don’t change quickly.

The farmers consistently keeping the most money per acre are applying nitrogen at or near (Maximum Return to Nitrogen) MRTN rates. With anhydrous now over $1,000/ton, the profit-maximizing rate has likely come down from where it was a few months ago. Farmers can find the optimal rate for their region using the most up-to-date numbers at CornNRateCalc.org.

According to a recent survey conducted after PCM farmer received their annual data analysis:

• 68% of farmers not already using MRTN rates said they’re likely to start
• 66% said they plan to add in-season nitrogen applications to improve efficiency

That kind of shift doesn’t happen because someone told farmers to do it. It happens because the data makes the case.

The Bottom Line

Ten years of PCM data from thousands of fields tells a consistent story: the farmers keeping the most money per acre are not the ones applying the most nitrogen.

If you’re ready to see what the most profitable nitrogen strategy is for your fields, PCM is free to join and provides you with an annual field-by-field analysis.