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Compression of Agricultural Soils from Eight Soil Orders¹

ABSTRACT

Compression curves (bulk density vs. log applied stress) determined on 36 world agricultural soil samples at a given water content were linear over the range of stresses from about 1 to 10 kg cm^–2. Compression curves determined for soils at different water contents were approximately parallel to each other over the range of initial pore water potentials from –0.05 to –1.0 bar. The compression index, C (slope of the compression curve), increased approximately linearly as clay content of the soil increased up to about 33% and then remained approximately constant as clay content further increased. The maximum C value was 0.55 for soils with predominantly 2:1 type clays and 0.50 for soils with predominantly kaolinite or iron oxides in the clay fraction. If the compression curve at one water content is known, a procedure is suggested to predict compression curves at other water contents.

¹ Contribution from the Soil and Water Management Research Unit, Science and Education Administration — Agric. Research. USDA, St. Paul, Minn., in cooperation with the Minnesota Agric. Exp. Stn., Paper no. 10,586, Sci. Journal Series.

² Soil Scientist, USDA, SEA-AR, and Professor, Univ. of Minnesota, St. Paul, Minnesota; Soil Scientist, USDA, SEA-AR, St. Paul, Minnesota; and former Graduate Student, Univ. of Minnesota, St. Paul, MN 55108.

Received for publication April 18, 1979. Accepted for publication August 15, 1979.

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