The source of irrigation water has ion concentration of Na+, ca++ and mg++ as 30, 20 and 12 milliequivalent per litre respectively. The SAR of this water is approximately.
1
7.5
2
10
3
12.5
4
15
The source of irrigation water has ion concentration of Na+, ca++ and mg++ as 30, 20 and 12 milliequivalent per litre respectively. The SAR of this water is approximately.