The purpose of this study is to evaluate the economic optimum nitrogen rate (EONR), which is the rate of nitrogen that maximizes a crop’s profitability.

2018 Southern Illinois Wheat Nitrogen Rate Study

Spring seasons in southern Illinois are typically very wet and followed by dry summer months. This year was an exception, with a combined precipitation total of 14.2 in. of rain from February to the end of May. This prevented loss of nitrogen (N) in comparison to most years. We also experienced a storm event at the end of May with extremely high winds that created lodging in the higher N rate plots. As a result of these factors, the lower N rates provided the largest return on investment (ROI) this year.

The four-year data for this study now shows that 92 to 108 units of N (pending the cost of N per unit) delivers the highest ROI here at Beck’s Southern Illinois PFR location. This falls right in line with our other PFR locations that have shown that 100 units is our multi-year, multi-location EONR.

 Feekes 1: 2 oz. PowerFlex® HL Feekes 7: 0.9 oz. Harmony® Extra SG | 

Feekes 10.5.1: 1.28 oz. Warrior II, Escalate® | 

2021 Iowa Corn Nitrogen Placement Study ANHYDROUS AMMONIA

Nitrogen Rate Study

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