| Physico-chemical properties of soil | Hanzhong | Yulin | Yangling |
|---|---|---|---|
| Clay (< 0.002 mm) % | 39.15 | 4.64 | 27.87 |
| Silt (0.05–0.002 mm) % | 31.48 | 88.50 | 56.13 |
| Sand (> 0.05 mm) % | 29.37 | 6.98 | 16 |
| pH (1:2.5) | 8.4 | 8.1 | 8.7 |
| EC (1:2.5) (µS cm−1) | 317 | 186 | 259 |
| Total organic carbon g kg−1 | 7.9 | 7.5 | 8.2 |
| Total Nitrogen g kg−1 | 1 | 0.7 | 0.9 |
| Total phosphorus g kg−1 | 18.2 | 16.8 | 18.9 |
| Total potassium g kg−1 | 241 | 229 | 249 |