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A Method for Measuring the Vertical and Horizontal K_sat of Clay Soils with Macropores¹

ABSTRACT

A field method is presented for measuring the vertical and horizontal K_sat of a cube of soil (25 x 25 x 25 cm) which is carved out in situ and covered with gypsum. A vertical K_sat is measured by infiltrating water into the exposed upper surface and by collecting it below the exposed lower surface of the cube. The cube is then turned. The two open surfaces are covered with gypsum, which is removed from the other two vertical sidewalls. These turn into surfaces for percolation after again turning the cube. A vertical K_sat is now measured which represents the horizontal K_sat of the cube in its original position in the soil. The method is inexpensive and simple, creates the required large sample in clay soils, does not involve compaction of soil, can be used above the water table, and defines K_sat in terms of direction.

¹ Contribution from the Netherlands Soil Survey Institute, P. O. Box 98, 6700 AB Wageningen, the Netherlands.

² Soil Scientists, Dep. of Applied Soil Physics.

Received for publication September 30, 1980. Accepted for publication January 11, 1981.

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