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Preferred Term:

sodium adsorption ratio

Definition:
Sodium adsorption ratio is a measure of the amount of sodium (Na) relative to calcium (Ca) and magnesium (Mg) in the water extract from saturated soil paste. It is the ratio of the Na concentration divided by the square root of one-half of the Ca + Mg concentration. Soils that have SAR values of 13 or more may be characterized by an increased dispersion of organic matter and clay particles, reduced saturated hydraulic conductivity (Ksat) and aeration, and a general degradation of soil structure.
Concept Schemes:
NALT Full
Broader Concept:
URI:
https://lod.nal.usda.gov/nalt/333471
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RDF/XMLCreated 2019-08-30, last modified 2019-11-25