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Sorghum and Corn: Crop Management
in Stress-Prone Environments
February 2011
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By Scott Staggenborg, Ph.D.
Professor of Cropping Systems
Department of Agronomy
Kansas State University
Phone: 785-532-7214
sstaggen@ksu.edu |
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Summary:
In drought prone environments, sorghum typically is believed to have a yield advantage. As water supplies increase, corn yields increase and there is a point where local water supplies and growing conditions improve to where corn has a yield and economic advantage over grain sorghum. We used crop performance test data from Kansas and Nebraska from 1992 to 2005 to evaluate over 200 environments to determine at what corn yield level does grain sorghum no longer have a yield or economic advantage. If based solely on yield, sorghum is expected to out yield corn in environments where corn yields are approximately 115 bu/a or lower. If economics are applied to these data (Partial crop budgets from respective states were used), the decision point varies based on the sorghum to corn price ratio. If sorghum is priced at 70% of corn, then the yield decision point declines to 74 bu/a. At 0.87 sorghum:corn price ratio, the decision point becomes 105 bu/a. If the price for the two crops are equal then the decision point becomes 141 bu/a and if sorghum price is 117% of the corn price, the decision point becomes 216 bu/a.
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