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ABSTRACT
Beginning in 1951, a series of experiments was initiated on several soils for the primary purpose of determining the value of VAMA (a modified vinyl acetate maleic acid compound), and HPAN (a hydrolized polyacrylonitrile), for controlling erosion of soil by wind.
VAMA increased substantially the proportion of water-stable aggregates in all soils tested and decreased the proportion of fine water-dispersible particles < 0.02 mm. in diameter. From this standpoint VAMA may be considered a very effective soil aggregating agent. However, the great majority of the water-stable aggregates formed by VAMA were of the size erodible by wind.
VAMA applied to the surface of the ground, or mixed with the soil, generally increased the crodibility by wind. The soils treated with VAMA were loose and friable and had a granular surface. The untreated soils were more or less cemented together and had a distinctly developed surface crust. The crust was resistant to wind erosion despite its unfavorable characteristics otherwise.
VAMA was beneficial for producing good soil tilth and for increasing soil permeability. Both of these characteristics tend to reduce erosion by water and increase crop yields.
VAMA was incorporated into the soil more conveniently as dust than as spray.
HPAN applied on top of the ground was ineffective in controlling erosion of soil by wind as early as one week after the application. Erosion, in fact, was increased in some cases due to the application of HPAN.
1 Contribution 490, Department of Agronomy, Kansas Agr. Exp. Sta., Manhattan, Kans., and the B.P.I.S.A.E., U. S. Department of Agriculture. Cooperative investigations in the mechanics of wind erosion. Acknowledgment is due G. W. Wright for assistance in determining permeability and moisture holding capacity of soils. Presented before joint meeting of Div. I and Div. III, Soil Science Society of America, Dallas, Tex., Nov. 19, 1953.
2 Professor of Soils, Kansas Agr. Exp. Sta., and Agent, Division of Soil Management — Irrigated and Dry Land Regions, B.P.I.S.A.E.
Received for publication December 16, 1953.
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