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Determination of Soil Solution Electrical Conductivity from Bulk Soil Electrical Conductivity Measurements by the Four-Electrode Method¹

ABSTRACT

Soil electrical conductivity (EC_a) by the four electrode method was studied in the laboratory as a function of soil water electrical conductivity (EC_w) and water content in six soil types. A linear relationship between EC_a and EC_w was valid only at salinities > 4 mmho/cm. At very low salinity levels the contribution of the surface conductance was not constant and had a higher contribution than EC_w to measured EC_a. A method for calculating the partial contribution of surface conductance to EC_a as a function of EC_w and clay content is applied including a correction for dependence on the soil water content.

¹ Contribution from the Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, Israel. no. 168-E, 1979 series.

² Chemist, Division of Soil Physics, and Soil Scientist, Division of Soil and Physical Chemistry, respectively.

Received for publication December 15, 1979. Accepted for publication July 9, 1980.