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Structural Implications of Moisture Retention by Clay-Size Soil Materials¹

ABSTRACT

At differential pressures, less than 1 atm., clay materials from soils retain much more water than calculations from Gouy theory would predict. Experimental evidence is shown which indicates that the excess water held in these materials is the result of a structure consisting of particle-to-particle bonds. The ability of this structure to resist pressures and by inference, the strength of the particle-to-particle bonds, can be increased by adding organic matter and decreased by increasing the amount of sodium on the exchange complex.

¹ Joint contribution of the Colorado Agr. Exp. Sta. and the Western Soil and Water Management Section, Soil and Water Conservation Research Branch A.R.S., U.S.D.A. Authorized by the Director of the Colorado Agr. Exp. Sta. for publication as Scientific Journal Series No. 485. This work was partially supported by funds from Regional Research Project W-30. Presented before Div. I, Soil Science Society of America, Cincinnati, Ohio, Nov. 13, 1956.

² Assistant Agronomist (Soils), Colorado State University and Soil Scientist, A.R.S., U.S.D.A.

Received for publication December 15, 1956. Accepted for publication November 5, 1957.