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A Technique for Continuous Monitoring of pH in Soil Systems¹

ABSTRACT

A technique is described for continuous in situ measurement of pH in soil systems. The instrumentation consists of several minature combination electrodes connected through a stepping switch arrangement to an amplifier and a single-point recorder. The unit is not subject to external disturbances and is applicable to situations where information concerning rate and degree of pH change is desired. A description of the system and an experimental example of its use are discussed.

¹ Contribution from the Soils and Fertilizer Research Branch, Division of Agricultural Development, TVA, Wilson Dam, Ala.

² Formerly Soil Physicist, TVA, now Soil Scientist, SWC-ARS-USDA, Pullman, Wash., and Research Chemist (Soils), TVA, Wilson Dam, Ala., respectively.

Received for publication November 15, 1965. Accepted for publication March 15, 1966.