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What is a sodic water and why is it defined as sodic?

April 26, 2017defined sodic water

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What is a sodic water and why is it defined as sodic?

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Sodic water is high in sodium (Na+) concentration relative to concentrations of calcium (Ca2+) and magnesium (Mg2+). The sodicity of water is expressed as the sodium adsorption ratio (SAR), SAR = Na / &#8730 [(Ca + Mg) / 2] (These values are in meq/L) SAR = (Na x 0.043) / &#8730{[(Ca x 0.05) + (Mg x 0.083)] / 2} (These values are in ppm or mg/L) Sodic water is defined as having a SAR greater than 12.