Research Article
Suitability Assessment of Surface Water Quality for Irrigation: A Case Study of Modjo River, Ethiopia
Table 5
SAR values based on general irrigation water category (Source: [
20]).
| SAR | Category | Description of category | Precaution and management suggestions |
| 0–10 | 1 | Low Na water | Little danger | 10–18 | 2 | Medium Na water | Problems on fine texture soils and sodium sensitive plants, especially under low-leaching conditions. Soils should have good permeability | 18–24 | 3 | High Na water | Problems on most soils. Good salt tolerant plants are required along with special management such as the use of gypsum | >24 | 4 | Very high Na water | Unsatisfactory except with high salinity (>2.0 dS/m), high calcium levels, and the use of gypsum |
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