Table 2 The suitability of EC for irrigation water
From: Major concerns of surface water quality in south-west coastal regions of Vietnamese Mekong Delta
EC (µS cm−1) | Suitability for irrigationa |  | Number of samples | ||
|---|---|---|---|---|---|
Mar | % | Sept | % | ||
 < 250 | Entirely safe, suitable for all types of crops | 5 | 10.2 | 17 | 34.7 |
250–750 | Medium salinity, safe practices for crops | 18 | 36.7 | 14 | 28.6 |
750–2250 | Medium to high saline, safe at allowable limits for plants | 2 | 4.1 | 4 | 8.2 |
2250–4000 | High salinity, salt-tolerant crops can be grown | 2 | 4.1 | 2 | 4.1 |
4000–6000 | Very high salinity, only high salt-tolerant plants can be grown | 0 | 0.0 | 2 | 4.1 |
 > 6000 | Unsuitable for irrigation | 22 | 44.9 | 10 | 20.4 |