INFILTRATION INTO HOMOGENEOUS AND LAYERED COLUMNS OF AGGREGATED LOAM, SILT LOAM, AND CLAY SOIL

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Abstract
Infiltration rates and moisture profiles were measured during vertical infiltration into three soils of differing texture and aggregate structure. The measurements were made both for homogeneous columns of the air-dry soil and for columns made up of two-layer combinations of the three soils. Infiltration rates and profiles for the same soils were computed on the basis of tension, diffusivity and conductivity data obtained on wetting. Agreement between measured and computed moisture profiles was satisfactory considering the high variability in moisture movement found in packed columns of coarsely aggregated soils. Differences in aggregate-size distribution and bulk density produced variation in tension and conductivity which in turn had a marked influence on infiltration rate.

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