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Row Spacing, Plant Populations and Moisture Supply as Factors in Dryland Grain Sorghum Production¹

Synopsis: Field experiments and long term weather data indicate that in the Southern Great Plains plant populations of about 18,000 plants per acre in 40-inch rows will in most years result in the best grain yields. Forage production was higher with reduced row width and increased seeding rates. Results are explained on the basis of water availability and use during the growing season.

² Soil Scientists, Soil and Water Conservation Research Division, ARS, USDA, Newell, S. D., Fort Collins, Colo., and Bushland, Texas, respectively; J. J. Bond and T. J. Army were formerly at Southwestern Great Plains Field Station, Bushland, Texas. The latter is now Senior Research Associate, International Minerals and Chemical Corporation, Skokie, Illinois. The authors acknowledge the valuable assistance of E. B. Hudspeth, Jr., for constructing the experimental seeder employed in these experiments. Computational assistance of the Statistical Laboratory of Texas A and M College is gratefully acknowledged.

Received for publication April 2, 1963.

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