Discussion
The sodium hazard (Sodicity hazard) of irrigation water are often expressed through SAR. What shall be considered a safe SAR value for irrigation water being applied to crops ?
Answer: A
A safe SAR for irrigation water is Less than 10.
The sodium adsorption ratio compares sodium with calcium and magnesium in water:
\[ SAR = \frac{Na^{+}}{\sqrt{(Ca^{2+} + Mg^{2+})/2}} \]
with concentrations in milliequivalents per litre. In the US Salinity Laboratory classification, water with SAR up to 10 is low in sodium hazard (class S1) and can be used on almost all soils. As SAR rises above 10, sodium increasingly disperses clay, destroys soil structure and lowers permeability, so the higher ranges in the other options are progressively more hazardous.
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