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Soil Scientists' Proficiency in Describing Soil Consistence¹

ABSTRACT

A recent field trip for a group of soil scientists from the western United States permitted comparison of professional soil scientists' description of dry and moist soil consistence and comparison of the descriptions of consistence with unconfined compressive strengths of dry soil.

Field party members agreed fairly well with each other in the description of the consistence of moist soils (60% agreement) and dry soils (70% agreement). There was a logarithmic relation between their description of dry consistence and unconfined compressive strengths. The unconfined compression test thus seems to provide a suitable soil consistence standard. The range in unconfined compressive strengths within classes increases from the slightly hard to the very hard classes.

¹ A contribution from the Soil Survey Laboratories, SCS, USDA and the Department of Soils & Plant Nutrition, Citrus Research Center, University of California, Riverside.

² Research Soil Scientists, Soil Survey Laboratory, SCS, USDA, P.O. Box 672, Riverside, Calif.

³ Research Assistant, University of California, Riverside. (Presently Research Soil Scientist, Soil Survey Laboratory, SCS, USDA, Plant Industry Station, Beltsville, Md.)

Received for publication September 26, 1968. Accepted for publication December 12, 1968.