Table 14 Classification of irrigation water according to sodium percent (Wilcox 1955)
Water class | Sodium percent | Specific conductance (EC) (μs/cm) | Number of groundwater samples |
|---|---|---|---|
Excellent | < 20 | < 250 | 21 |
Good | 20–40 | 250–750 | 93 |
Permissible | 40–60 | 750–2000 | 5 |
Doubtful | 60–80 | 2000–3000 | 40 |
Unsuitable | > 80 | > 3000 | – |