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Response of Salinity Sensors to Rapidly Changing Salinity¹

ABSTRACT

Based on the assumption that diffusion of solutes into and out of the sensitive element of a salinity sensor determines its response time, a theory was developed to describe the response of the sensor to changes in soil salinity. This theory was experimentally verified in solution and in soils. The response of a sensor was shown to be adequately described by a single response factor. Proper use of this factor permits the actual electrical conductivity of the soil solution to be inferred from sensor readings where soil salinity changes rapidly.

¹ Contribution from the US Salinity Laboratory, Western Region, Agricultural Research Service, USDA, Riverside, Calif. 92502.

² Visiting Soil Scientist and Soil Scientist US Salinity Laboratory, respectively. The senior author's current address is The Institute for Land and Water Management Research, Wageningen, The Netherlands.

Received for publication October 24, 1972. Accepted for publication April 9, 1973.