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Fig. 1. Multidecadal trends in Corn Belt average maize planting date (day of year that 10% of planting is completed) and maize yield. The regional averages are calculated using an area-weighted approach based on the harvested area of maize in each state (SD, NE, KS, MN, IA, MO, WI, IL, MI, IN, OH, KY) and its contribution to the regional total.
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