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A Unifying Quantitative Analysis of Soil Texture¹

ABSTRACT

The soil texture triangle used by the U.S. Department of Agriculture is converted into a new texture diagram which contains all information in the original triangle, but additionally, gives mean particle size and particle size standard deviation of soil samples. Thus, mechanical analysis information on percents of clay, silt, and sand together with particle-size limits for clay, silt, and sand are found in a single unified system. The new diagram provides greater resolution in detecting classified soil samples within a texture region, it can be extended to cover coarse fragments, and other soil texture classifications can be incorporated into it.

¹ Contribution from USEPA Environmental Research Laboratory, Corvallis, OR 97333 and Department of Soil Science, Oregon State University, Corvallis, OR 97331.

² Senior Research Scientist, USEPA and Professor, Oregon State University, Dep. of Soil Science, respectively.

Received for publication December 17, 1982. Accepted for publication August 25, 1983.