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Referencing Water Content Effects on Soil Electrical Conductivity—Salinity Calibrations¹

ABSTRACT

The effects of hysteresis on soil electrical conductivity (_a), matric potential (_m), and _a-volumetric water content () relations were evaluated for two matrix materials using laboratory column techniques. These _a- relations were found to be little dependent on whether changes in soil moisture occurred by drying or wetting. In contrast, _a-_m relations displayed a strong hysteresis effect. It is concluded that is a simpler and more accurate parameter to use for adjusting for soil moisture status when determining soil salinity from measurements of _a.

¹ Contribution from the U. S. Salinity Laboratory, USDA, Riverside, CA 92501. This research was supported in part by a grant from the French Ministère des Affaires Etrangeres.

² Research Scientist, 262 Rue des Marguerites, 34980 St. Gely du Fesc, France, and Research Leader, U. S. Salinity Lab., 4500 Glenwood Dr., Riverside, CA 93501, respectively.

Received for publication December 27, 1984. Accepted for publication June 3, 1985.

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