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Influence of Antecedent Soil Moisture Suction on Saturated Hydraulic Conductivity of Soils¹

ABSTRACT

Studies were conducted to evaluate influences of antecedent soil moisture suction on saturated hydraulic conductivities of soils. These studies revealed that saturated hydraulic conductivity of a soil is a dynamic property which is markedly influenced by antecedent soil moisture suction. Antecedent soil moisture of 0.33 bar suction, such as is often practiced with trickle irrigation, caused marked reduction in the ability of soil to conduct water. Gases produced by microorganisms at low suction, their subsequent entrapment, and their influence on soil macrovoids are largely responsible for reduction in ability of soil to conduct water. Reduction of effective soil macrovoids by microbial growth, flowing water, and/or soil moisture suction can also reduce soil permeability. These findings indicate that soil moisture suction and management such as trickle irrigation can influence the ability of soil to conduct water.

¹ Contribution from the Texas Agr. Exp. Sta., Texas A&M Univ. Agr. Res. and Ext. Center, Weslaco, Texas.

² Professor, Texas Agr. Exp. Sta., Texas A&M Univ. Agr. Res. and Ext. Center, Weslaco, Texas.

Received for publication September 10, 1973. Accepted for publication December 4, 1973.