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Surface Residue, Water Application, and Soil Texture Effects on Water Accumulation¹

ABSTRACT

Surface residue rates and water application amounts affect evaporation from soil. These factors were evaluated for their effects on water accumulation in a clay loam and a fine sandy loam soil. Surface residue rates ranged from 0 to 12,000 kg/ha and water was added at 0.25, 0.5, 1.0, or 2.0 cm/addition. At low residue rates and water applications, little or no water accumulated in the soils. The amount of water that accumulated in the soils increased as surface residue rates and water applications increased. Results for the two soils were remarkably similar, apparently because the liquid and vapor flow characteristics for the two soils were similar at high water contents, even though their water retention characteristics differed markedly. The results of this laboratory study are discussed with regard to residue management practices for low (dryland) and high (irrigated) residue production systems of the Great Plains.

¹ Contribution from the Soil, Water, and Air Sciences, Southern Region, USDA-ARS, in cooperation with The Texas Agric. Exp. Stn., Texas A&M Univ.

² Soil Scientist, USDA Southwestern Great Plains Res. Ctr., Bushland, TX 79012.

Received for publication July 31, 1975. Accepted for publication November 17, 1975.