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Categorization of irrigation water
| Group | ECiw (dS m−1) | SARiw (mmol−1)½ | RSC (meq L−1) |
|---|---|---|---|
| A. Good | < 2 | < 10 | < 2.5 |
| B. Saline | |||
| i. Marginally saline | 2–4 | < 10 | < 2.5 |
| ii. Saline | > 4 | < 10 | < 2.5 |
| iii. High-SAR saline | > 4 | > 10 | < 2.5 |
| C. Alkali water | |||
| i. Marginal alkali | < 4 | < 10 | 2.5–4.0 |
| ii. Alkali | < 4 | < 10 | > 4.0 |
| iii. Highly alkali | variable | > 10 | > 4.0 |
