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An Improved Technique for Determining Soil Electrical Conductivity-Depth Relations from Above-ground Electromagnetic Measurements¹

ABSTRACT

An improved method has been developed for determining the distribution of bulk soil electrical conductivity, EC_a, through the soil from electromagnetic measurements taken at the soil surface with the Geonics Limited EM-38 device. Induced electromagnetic conductivity readings taken with the EM-38 device's coil configuration oriented parallel and then perpendicular to the soil surface provided sufficient information, when used with equations derived from geophysical instrumentation data, to produce a soil electrical conductivity-depth profile. The simplicity of this method further enhances the praiticability of the newly developed electromagnetic technique for field measurements of salinity and for saline seep diagnosis.

¹ Contribution from the U. S. Salinity Laboratory, USDA, Riverside, CA 92501.

² Soil Scientist and Supervisory Soil Scientist, respectively.

Received for publication September 9, 1981. Accepted for publication January 27, 1982.

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