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The Effect of Osmotic Pressure Gradients on Water Movement in Unsaturated Soil¹

ABSTRACT

Water movement, in response to osmotic pressure gradients, was measured in clay loam and sandy loam soils at soil water suctions from 0.08 to 15 bars. Movement in response to osmotic pressure gradients were compared to movement in response to hydraulic pressure gradients in the soil water suction range from 0.08 to 0.65 bars. At suction less than 0.5 bars, the amount of water moved by osmotic pressure gradients was generally less than 4% of the water moved by hydraulic gradients of equal magnitude.

Contribution from Colorado State University and Northern Plains Branch, Soil and Water Conservation Research Division, ARS, USDA. Research supported in part by the Office of Water Resources Research, Department of Interior. Scientific Series no. 1294.

² Associate Professor of Soil Physics, University of California, Riverside; Professor Soils, Colorado State University and Soil Scientist, USDA, Fort Collins, Colo.; Research Assistant, Colorado State University.

Received for publication May 2, 1968. Accepted for publication July 22, 1968.