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Summary

Drier than normal conditions across the state resulted in a statewide decrease in corn yield from the previous season here in Minnesota. This same trend was largely reflected in the NMI data, with lower yields than previous season average yields across treatments in all four regions of the state where trials were performed.

Across the state, the average low nitrogen rate treatment was 154 lbs. N/ac, which resulted in an average yield of 195 bu/ac. The average high nitrogen rate treatment was 195 lbs. N/ac, which resulted in an average yield of 200 bu/ac. Of the 45 individual trial locations, 35 (78%) showed no significant difference between resulting treatment yields – meaning reducing the N application rate did not negatively impact yield.

The most popular fertilizer product across the state was urea or urea with other products (e.g., ammonium sulfate) applied in the same time window. That said, anhydrous ammonia was the primary N source on the largest number of trials in the Southwestern region (38% of trials), and urea ammonium nitrate (UAN – 32%) was the primary nitrogen source on the largest number of trials in the South Central region (36% of trials).

Full Report

The full report is included in the Minnesota Digital Water Resource Library.

2023 NMI Report

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