Classification pattern | Ranges | Categories |
Total Dissolved Solids (TDS) [27] | <500 | Desirable for drinking |
500 - 1000 | Permissible for Drinking | |
1000 - 3000 | Useful for irrigation | |
>3000 | Unfit for drinking and irrigation | |
Percent Sodium (% Na) [28] | 0 - 20 | Excellent |
20 - 40 | Good | |
40 - 60 | Permissible | |
60 - 80 | Doubtful | |
>80 | Unsuitable | |
Sodium Absorption Ratio (SAR) [29] | 0 - 10 | Excellent |
10 - 18 | Good | |
18 - 26 | Doubtful | |
>26 | Unsuitable | |
Permeability Index (PI) [30] | >75 | Class-I |
25 - 75 | Class-II | |
Magnesium Hazard (MH) [31] | >50% | Unsuitable |
<50% | Suitable |