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New Calibrations for Determining Soil Electrical Conductivity—Depth Relations from Electromagnetic Measurements

USDA-ARS, U.S. Salinity Lab., 4500 Glenwood Dr., Riverside, CA 92501

* Corresponding author.

ABSTRACT

Soil salinity can be determined in the field from measurements of soil electrical conductivity (EC_a). Measurements of depth-integrated EC_a can be made remotely using electromagnetic induction (EM) techniques. A means of determining EC_a for the soil depth intervals of 0 to 30, 30 to 60, 60 to 90 cm, etc., from the EM measurements is needed for salinity appraisal. The EM and EC_a measurements were made at about 900 sites in the San Joaquin Valley of California. This large data set was used, along with rigorous statistical techniques, to obtain empirical coefficients used in equations to predict EC_a by depth intervals within the soil profile from EM readings taken above ground. Predictions were found to be more accurate using these new coefficients rather than those previously available.

Received for publication May 31, 1988.

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