Sodium Adsorption Ratio (SAR) An expression of relative activity of sodium ions in exchange reactions with soil, indicating the sodium or alkali hazard to soil. It is calculated from the expression: SAR = (Na)/(Ca + Mg)/2½ where all quantities are expressed in milliequivalents per liter (meg/L). It is a particularly important measure in waters used for irrigation purposes. Waters range in respect to sodium hazard from those which can be used for irrigation on almost all soils to those which are generally unsatisfactory for irrigation.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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