2022 Winter Wheat Response to Nitrogen Rate in Northwest Ohio
Applied Research
Edwin Lentz
Extension Educator and Professor
The Ohio State University Extension
Findlay
Abstract
Producers rely on university research to apply the proper rate of nitrogen for optimal wheat yields and to reduce the risk of nutrient loss to the environment. Few nitrogen rate studies have been completed in recent years in the Eastern Corn Belt. The objective of this study was to determine the nitrogen rate for optimal yields for soft red winter wheat at this location. AGI 217B, a medium-maturity variety, was established in the fall of 2021 at the OARDC Northwest Agricultural Research Station near Custar, Ohio. Nine spring nitrogen rate treatments were applied as soon as the field was suitable for equipment with urea-ammonium nitrate after greenup (Feekes GS 3) and before Feekes GS 5. Rates included in the study were 0, 40, 60, 80, 100, 120, 140, 160, and 180 pounds per acre. All treatments received 27 pounds of nitrogen per acre prior to planting. Experimental design was a completely randomized block replicated four times. Analysis was a simple ANOVA. Grain yield, test weight, leaf nutrient analysis, and spike number were measured for each plot. The yields were 56, 83, 95, 101, 105, 109, 109, 117, and 114 bushels per acre for the 0, 40, 60, 80, 100, 120, 140, 160, and 180 nitrogen rates, respectively. Grain yields were significantly larger than the 0 treatment for all nitrogen rates, p < 0.10. Yields significantly increased with each larger nitrogen rate until the 80-pound treatment. Yields were similar between the 80 and 100 rates; the 100, 120, and 140 rates; the 120, 140, and 180 rates, and the 160 and 180 rates. Yield increases diminished and plateaued after the 100-pound rate, suggesting an optimum nitrogen rate between 80 and 100 pounds of nitrogen per acre. Data from this site will be used to determine future nitrogen rates for wheat in the Extension Bulletin E-2567, Tri-State Fertilizer Recommendations for Corn, Soybean, Wheat, and Alfalfa.
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Authors: Edwin Lentz
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Lentz, E. Extension Educator and Professor, The Ohio State University Extension, Ohio, 45840