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Effect of Soil Temperature on Grain Sorghum Growth and Yield¹

Synopsis: Clear plastic soil covers increased Houston Black clay early season soil temperatures 10° F. at the 3-inch depth and accelerated plant development sufficiently to hasten maturity and increase grain yield. Grain sorghum yields per acre varied from 62.6 cwt. on bare plots to 73.5 cwt. with a clear plastic cover. Water-use efficiency varied from 315 pounds on bare plots to 428 with clear plastic.

² Research Soil Scientist, Southern Plains Branch, Soil and Water Conservation Research Division, ARS, USDA, Temple, Texas. The author is indebted to J. S. Robins for guidance and assistance in the planning and initiation of this study. Appreciation is expressed to J. D. Williams, Data Processing Center, Texas A. & M. College, for assistance with the statistical data presented. Chemical analyses of forage and grain samples were made by the State Chemists Laboratory, Texas A. & M. College. D. O. Thompson and G. D. Alston assisted with the collection and processing of field data.

Received for publication June 27, 1961.