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Field Application of the Four-Electrode Technique for Determining Soil Solution Conductivity¹

ABSTRACT

In situ electrical conductivity of a soil solution (EC_w) was calculated using the four-electrode technique and a newly suggested calibration procedure. The EC_w values were compared with electrical conductivity of soil solution extracts (EC_1:1), and the difference was due to variations in soil moisture and total salt content of the soil. The suggested calibration method and its application are compared with previous ones. Water content, surface electrical conductivity, and replacement of EC of the saturated extract by EC of drainage solution are considered.

¹ Contribution from the Agric. Research Organization, The Volcani Center, Bet Dagan, Israel. No. 206-E, 1979 series.

² Chemist, Division of Soil Physics, ARO, Bet Dagan, Israel.

Received for publication December 14, 1979. Accepted for publication September 21, 1980.