An identified source of irrigation water has ion concentrations of Na+ , Ca++ and Mg++ as 20, 10 and 8 milliequivalents per litre, respectively. The SAR of this water is approximately : a) 2.06 b) 6.67 c) 2.67 d) zero

An identified source of irrigation water has ion concentrations of Na+ , Ca++ and Mg++  as 20, 10 and 8 milliequivalents per litre, respectively. The SAR of this water is  approximately :  a) 2.06 b) 6.67 c) 2.67 d) zero
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Answer :

b) 6.67
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