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Nomographic Calculation of Linear Extensibility in Soils Containing Coarse Fragments¹

ABSTRACT

Linear extensibility is a variable being used by the Soil Survey Laboratories to characterize the expansion-contraction properties of soil. It is calculated from bulk density data and must be corrected for coarse fragments when they are present in the field. A pair of nomographs is presented to facilitate these calculations. The volume percent of fine-earth fabric (F) is determined from the first nomograph and transposed to the second nomograph where it serves to correct the extensibility as determined on the fine-earth fabric. The value F may also be used to facilitate conversion of other laboratory data to a field basis where coarse fragments are present.

¹ Contribution from the Soil Survey Laboratory, SCS, USDA, Lincoln, Nebraska.

² Soil Scientist.

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