Growing degree days for hybrid corn production, Southwest Missouri
"In 1970 the Hybrid Seed Corn Industry adopted a new method for rating the maturity of corn. This method uses the thermal unit approach to the prediction of maturity which is more accurate then the old 'days-to-maturity' ratings. This new method is Growing Degree Days (GDD) and is based on the number of heat units necessary for corn to reach physiologic maturity."--First page.
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Provided for historical documentation only. Check Missouri Extension and Agricultural Experiment Station websites for current information.