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Measurement of Inverted Electrical Conductivity Profiles Using Electromagnetic Induction¹

ABSTRACT

Due to sharp discrepancies in the relative response of the horizontal and vertical coil configurations of the Geonics Limited EM-38 electromagnetic induction soil conductivity meter for the top 15 cm of soil, the accuracy of measurement of bulk electrical conductivity for soil having a high surface electrical conductivity relative to deeper depths (i.e., an inverted electrical conductivity profile) has been unreliable. Two new approaches have been developed to compensate for these discrepancies, either through compensations in the vertical coil configuration response curve or the reestablishment of EM_0,H adjustment curves utilizing data solely from inverted conductivity profiles. Both approaches yield more consistently reliable calculated bulk soil electrical conductivities when compared to measured electrical conductivities using the four-electrode probe. The latter approach, however, appears to be more accurate.

¹ Contribution from the U.S. Salinity Laboratory, USDA-ARS, 4500 Glenwood Drive Riverside, CA 92501.

² Soil Scientist and Supervisory Soil Scientist, respectively.

Received for publication March 21, 1983. Accepted for publication November 14, 1983.

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