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Conductivity Instrumentation for In Situ Measurement of Soil Salinity¹

ABSTRACT

A transducer has been developed which is capable of assessing, in situ, the electrical conductivity of soil water. The transducer is constructed of porous glass with platinum electrodes and operates over the entire field moisture range. The transducer is accurate to within 10% when measured with an associated soild state meter in a conductivity range of 1–20 millimhos/cm @ 25C and a temperature range of 5–45C. Typically, the time required to achieve 63% of equilibrium response, in aqueous solutions, is less than 2 hours.

¹ Technical Paper 1432, Arizona Agr. Exp. Sta., Tucson. Contribution for The Dept. of Agricultural Chemistry & Soils. The work was done under Regional Research Project W-68.

² Soil Physicists, Burr-Brown Research Corporation and Professor, University of Arizona, Tucson, respectively.

Received for publication February 7, 1969. Accepted for publication April 21, 1969.