Determining soil and water sodicity from electrode measurements

Abstract

A method is presented for estimating the sodium adsorption ratio (SAR) of the saturated soil‐paste extract from three electrode measurements made directly in the saturated soil‐paste. An analogous method is presented for the determination of the SAR of extracts and solutions solely from electrode measurements made in the extract or solution. Both methods are carried out without the use of pH and ionic strength buffers. The methods were tested on a widespread range of salt‐affected soils and their extracts; they are deemed suitable for field applications in the diagnosis, screening, and classification of sodic soils and waters.

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