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Linear Extensibility as Calculated from Natural-Clod Bulk Density Measurements¹

ABSTRACT

Use of a coating that is flexible permits measurement of bulk density of natural clods at more than one moisture content. Linear extensibility, expressed as a coefficient (COLE) or as change in horizon thickness, can be calculated from the increase in bulk density between the water content at -bar tension and oven dryness. Extensibility data are given for a Marias soil (Entic Chromoxerert). Composition of the Marias soil remains similar with depth but the structure changes. COLE values are affected by the change in structure as are also PVC test results, but liquid and plastic limit values are affected little.

¹ Contribution from Soil Survey Laboratories, Soil Survey Investigations, SCS, USDA. Presented before Div. S-5 and S-1, Columbus, Ohio, Nov. 2, 1965. The writers wish to acknowledge the contribution of G. G. S. Holmgren, Soil Scientist, SCS, to the terminology and arithmetic expression.

² Respectively, Soil Scientists, Lincoln and Riverside Soil Survey Laboratories, SCS; Assoc. Professor of Agronomy, Purdue Univ.; and Regional Director, International Soil Testing Project, North Carolina State University—Agency for International Development.

Received for publication November 22, 1967. Accepted for publication February 27, 1968.