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Corn development and forecasted yields

Jeff Coulter, Extension Corn Specialist

Much of the corn in Minnesota is silking or rapidly approaching silking. As a guide, corn typically reaches physiological maturity (black layer) at around 55 to 60 days after silking.

Stress occurring between now and early August, resulting from dry soil conditions and hot air temperatures, can greatly reduce grain yield by reducing the number of kernels per plant. Hail damage to corn at this time also will greatly reduce yield, since all leaves are completely exposed by silking. Fortunately, the season has started with favorable conditions for corn growth in many areas.

To evaluate, in real time, the impact of this season’s weather on corn yield potential and its spatial variability across the Corn Belt, simulations of 2015 yield potential were performed on July 15 by University of Nebraska researchers as part of a multi-state project. Results are available at:

Updated yield forecasts will be provided in late July or early August.

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