Water Relations of a Profile-Modified Slowly Permeable Soil
1970
Unger, Paul W.
A study was conducted with samples obtained from Pullman silty clay loam modified to 0 (check), 90, or 150 cm with a large ditching machine. Objectives were to determine the potential for increasing water intake, retention, and storage by profile modification, and to characterize the modified soil. Profile modification to 90 and 150 cm effectively disrupted the slowly permeable horizon of Pullman soil. Soil bulk density and strength were significantly decreased, and soil porosity was significantly increased. Unmodified soil retained more water on a volumetric basis than modified soil at ⅓- and 15-bars tension, but plant-available water as estimated from the ⅓- and 15-bar values was not altered by modification. The lower water contents of the modified soil at low tensions provided for potentially greater aeration. Water entered modified soil more rapidly than unmodified soil under field conditions.
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