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Sodium Adsorption Ratio (SAR) And Exchangeable Sodium Percentage (ESP)



It is possible to estimate the sodium adsorption ratio (SAR) and exchangeable sodium percentage (ESP) after determining Ca, Mg and Na concentrations in water (SOP# 835).  The method has a detection limit of 0.1 for SAR and 1% for ESP.

U.S. Salinity Laboratory Staff. 1954. Choice of determinations and interpretation of data. pp. 25-26. In: L. A. Richards (ed.) Diagnosis and improvement of saline and alkali soils. USDA Agricultural Handbook 60. U.S. Government Printing Office, Washington, D.C.