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Restoring Productivity on Pullman Silty Clay Loam Subsoil under Limited Moisture¹

ABSTRACT

Applied fertilizer restored grain sorghum (Sorghum vulgare) yields on 10-cm cut Pullman silty clay loam to 93% of those obtained on uncut soil. On 20-, 30-, and 41-cm cuts, yields were restored to 87% of those on uncut soil. Soil water storage, water use, and water-use efficiency data revealed that differences in soil water storage and use were responsible for differences in yield when fertility was not limiting. Topsoil removal decreased and fill increased water-holding capacity of the soil profile. Topsoil removal decreased water loss from fallowed soil, but fill had little effect.

N was the only added nutrient required to produce highest yields obtained under limited moisture conditions in this study. Inadequately fertilized treatments used less water than adequately fertilized ones, but water-use efficiency was greater where plant nutrients were adequate.

¹ Contribution from the Soil & Water Conservation Research Division, ARS, USDA, and the Texas Agr. Exp. Sta., Texas A&M University.

² Research Soil Scientist, USDA, Bushland, Texas.

Received for publication December 5, 1968. Accepted for publication March 4, 1969.