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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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