By Scout Nelson
Researchers at the University of Nebraska-Lincoln (UNL) reported that above-normal temperatures during the final stages of the growing season reduced corn yield potential across Nebraska and the broader Corn Belt. Using the UNL Hybrid-Maize crop model, scientists evaluated crop development and forecast end-of-season yields across multiple locations.
Led by Patricio Grassini, the research team found that regional corn yield potential is expected to finish about 1% below the long-term average. Nebraska experienced some of the most noticeable impacts from elevated temperatures during grain filling.
By late September, most Nebraska corn fields had reached physiological maturity. Researchers said warmer-than-normal temperatures accelerated crop development and shortened the grain-filling period, limiting overall yield potential despite generally adequate rainfall.
The greatest impact was observed in irrigated corn production. Eight of the 13 irrigated locations evaluated across the Corn Belt are projected to have below-average yields, with several of those sites located in Nebraska.
Several irrigated Nebraska locations, including Alliance, Beatrice, Concord, Elgin, McCook, Mead, and North Platte, are forecast to finish below their historical yield potential. In contrast, Holdrege and O'Neill are expected to achieve yields closer to or slightly above average.
Rainfed corn performance was more mixed across the state. Locations such as Clay Center and Concord are projected to achieve yields at or above long-term averages, while southwestern Nebraska faces a greater risk of below-average production.
Researchers noted that above-normal nighttime temperatures during the later stages of grain filling lowered yield forecasts at many locations. Higher nighttime temperatures increase plant respiration, reducing the amount of energy available for grain development.
The forecast represents average yield potential for each location rather than individual fields. It does not account for factors such as hail, flooding, disease pressure, stand establishment issues, replanting, or nutrient losses that could further affect final yields.
Overall, the analysis indicates that late-season heat was the primary factor limiting Nebraska's 2026 corn yield potential, particularly in irrigated systems. While many rainfed acres are still expected to finish near historical averages, producers may see lower yields than initially anticipated as harvest progresses.
Photo Credit: gettyimages-awakr
Categories: Nebraska, Crops, Corn