Quality Of Irrigation Water Important Point
Subject- Soil Science
1.Field Irrigation Efficiency
| Component | Efficiency % |
| Light soil | 55% |
| Medium soil | 70% |
| Heavy soil | 60% |
| Graded border irrigation method | 53% |
| Basin irrigation method | 58% |
| Furrow irrigation method | 57% |
| Sprinkler irrigation method | 67% |
| Drip irrigation method | 80% |
| For rice cultivation | 32% |
2.Quality Of Ground Waters for Irrigation
| Water quality | Ec (ds/m) | SAR (m.mol/L) | RSC (me/L) |
| Good water | < 2 | < 10 | < 2.5 |
| Marginally saline water | 2-4 | < 10 | < 2.5 |
| Saline water | > 4 | < 10 | < 2.5 |
| High SAR Saline water | > 4 | > 10 | < 2.5 |
| Marginally alkali water | <4 | < 10 | 2.5-4 |
| Alkali water | < 4 | < 10 | > 4 |
| Highly alkali water | Variable | > 10 | > 4 |
EC- Electrical conductivity
RSC- Residual sodium carbonate
3.Classification of Irrigation Water Quality
| Quality of water | EC (m.mhos/cm) | pH |
| Excellent | 0.5 | 6.5–7.5 |
| Good | 0.5–1.5 | 7.5–8.0 |
| Fair | 1.5–3.0 | 8.0–8.5 |
| Poor | 3.0–5.0 | 8.5–9.0 |
| Very poor | 5.0–6.0 | 9.0–10.0 |
| Unsuitable | 6.0 | > 10 |
4.Classification of Irrigation Water Quality
| Quality of water | Na (ppm) | Cl (me./l) | SAR |
| Excellent | 30 | 2.5 | 1.0 |
| Good | 30–60 | 2.5–5.0 | 1.0–2.0 |
| Fair | 60–75 | 5.0–7.5 | 2.0–4.0 |
| Poor | 75–80 | 7.5–10 | 4.0–8.0 |
| Very poor | 80–90 | 10.0–12.5 | 8.0–15.0 |
| Unsuitable | > 90 | > 12.5 | > 15 |
SAR- Sodium Adsorption Ratio
Subject- Soil Science
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