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Effect of Exchangeable Sodium on Soil Electrical Conductivity-Salinity Calibrations¹

ABSTRACT

This study was undertaken to ascertain if soil sodicity significantly influences soil electrical conductivity (_a) — salinity calibrations. Laboratory columns of Fallbrook (Typic Haploxeralfs) and Yolo (Typic Xerorthents) soils were adjusted to various levels of salinity and sodicity by leaching them with solutions varying in electrical conductivity (_w) and sodium adsorption ratio (SAR); then _a was measured using four-electrode techniques. Calibrations obtained between _w and _a over the _w range 2 to 20 were compared at different levels of SAR ranging between 0 to 80 or 400. The calibrations between _w and _a were found to be insignificantly influenced by variations in SAR over the range studied. Normal variations in the exchangeable Na contents of typical saline, arid-land soils should not cause any serious misdiagnosis of soil salinity based on measurements of bulk _a and use of _w-_a calibrations.

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

² Visiting Research Scientist and Research Leader, Soil and Water Chemistry, U.S. Salinity Laboratory, Riverside, CA. This research was supported in part by a grant from the French Ministére des Affaires Estrangeres.

Received for publication January 17, 1985. Accepted for publication April 23, 1985.