Table 10 Classification of irrigation water based on salinity (EC) and (SAR) values; College of Agricultural Sciences (2002) and U.S. Salinity Laboratory Staff (1954)
Class | EC | TDS (ppm) | SAR | Order | Suitability |
|---|---|---|---|---|---|
Excellent | 0–250 | < 200 | < 10 | Low | Suitable |
Good | 250–750 | 200–500 | 10–18 | Medium | Moderately suitable |
Fair | 750–2250 | 500–1500 | 18–26 | High | Fairly suitable |
Poor | 2250–5000 | 1500–3000 | > 26 | Very high | Unsuitable |