Yield and Water Use by Different Populations of Dryland Corn, Grain Sorghum, and Forage Sorghum in the Western Corn Belt1

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Abstract
In South Dakota, grain yields of corn grown in 102‐cm rows with 35,000 plants/hectare and in 51‐cm rows with 45,000 and 70,000 plants/hectare, respectively, decreased with increasing population in adverse soil‐water seasons and were approximately constant during the more favorable growing seasons. Grain yields from grain sorghum planted in 102‐cm rows with 175,000 plants/hectare and in 51‐cm rows with 250,000 and 350,000 plants/hectare were the same in adverse years but increased markedly with increasing population during the better growing seasons. Corn, grain sorghum, and forage sorghum all gave increasing total dry‐matter yields with increasing population throughout the range of populations used. Water use was nearly the same for all crops within each year, although grain sorghum grown at the lowest population tended to use slightly less water.

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