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Super Slurper Effects on Crust Strength, Water Retention, and Water Infiltration of Soils¹

ABSTRACT

The effect of hydrolyzed starch polyacrylonitrile graft copolymer, commonly called "super slurper," at rates of 0.0, 0.025, 0.05, 0.1, 0.2, and 0.4% by weight on the crust strength, water retention, and infiltration of selected soils was determined. The strengths of simulated crusts were measured for all the treatments. Infiltration rates were measured in the laboratory for untreated soils and soils treated with 0.4% super slurper. Water retentions were measured for all treatments by use of pressure plate and pressure membrane apparati.

Super slurper decreased crust strength and infiltration and increased water retention. The crust strengths of a sandy loam, a loamy sand, and a clay loam soil were reduced 84, 75, and 54%, respectively, by the addition of 0.4% super slurper. Infiltration rates were also reduced. Sorptivities for a sandy loam, clay loam, and loamy sand soil, treated with 0.4% super slurper, were reduced 38, 18, and 11%, respectively. Loamy sand and sandy loam soils treated with super slurper retained more water than the untreated soils. Super slurper had little effect on water retention in the clay loam soil.

¹ Contribution from the Dep. of Agron., Oklahoma Agr. Exp. Stn., as part of project S-1718. Journal Manuscript no. 3810.

² Graduate Research Assistant and Associate Professor, respectively. Dep. of Agron., Oklahoma State Univ., Stillwater, OK 74078.

Received for publication August 15, 1980. Accepted for publication March 3, 1981.