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A Comparison of Different Methods for Measuring Soil Salinity¹

ABSTRACT

Soil salinity measurements with in situ salinity sensors, a four-electrode salinity probe, a four-electrode Wenner array, and a multi-electrode probe were compared in an experimental plot irrigated with 3.1 mmho/cm CaCl₂. Good agreement was obtained among expected salinity, soil extract (1:1) EC (electrical conductivity), and EC measurements with the salinity probe. The salinity probe requires good electrode-soil contact and is therefore limited to the higher range of soil water contents. The Wenner array functions also at lower water contents, but interpretation of the results is influenced by soil layering. Salinity sensors gave the highest variance in the results.

¹ Contribution from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel; no. 110-E, 1979 series.

² Chemist and Soil Physicist, respectively, Division of Soil Physics, ARO, Bet Dagan.

Received for publication April 24, 1979. Accepted for publication April 4, 1980.