Table 1.
Summary of main chemical properties of soils collected in the study area.
| Parameter | Item | R (n = 36) | W (n = 25) | P (n = 20) |
|---|---|---|---|---|
| pH (H2O) | Mean ± SD | 6.7 ± 0.9 | 6.4 ± 0.8 | 6.7 ± 0.9 |
| Geometric mean | 6.6 | 6.3 | 6.7 | |
| Range (median) | 4.7–8.0 (6.9) | 5.4–8.0 (6.0) | 5.5–8.0 (6.6) | |
| SOM (g/kg) | Mean ± SD | 18.5 ± 5.8 | 21.9 ± 6.5 | 23 ± 6 |
| Geometric mean | 17.3 | 21 | 22.2 | |
| Range (median) | 2.8–31.4 (19.3) | 12.1–38.3 (21.8) | 11.5–34.0 (22.8) | |
| TN (mg/kg) | Mean ± SD | 756 ± 249 | 973 ± 298 | 1034 ± 268 |
| Geometric mean | 715 | 927 | 1000 | |
| Range (median) | 269–1298 (748) | 447–1483 (984) | 637–1544 (1040) | |
| TP (mg/kg) | Mean ± SD | 643 ± 196 | 429 ± 104 | 602 ± 254 |
| Geometric mean | 616 | 418 | 561 | |
| Range (median) | 345–1098 (581) | 285–757 (408) | 357–1326 (487) | |
| AP (mg/kg) | Mean ± SD | 21 ± 13.9 | 14 ± 12.7 | 16.1 ± 26.7 |
| Geometric mean | 17.6 | 9.9 | 9.2 | |
| Range (median) | 6.6–65.8 (16.5) | 1.6–58.9 (11.6) | 2.9–123 (6.9) | |
| AK (mg/kg) | Mean ± SD | 93.5 ± 51.4 | 86.3 ± 21.1 | 83.3 ± 51.1 |
| Geometric mean | 84.3 | 84.0 | 74.0 | |
| Range (median) | 43.5–314 (78.9) | 58.8–134 (78.9) | 32.4–275 (76.5) |
R rape field soil, W wheat field soil, P paddy field soil, SOM soil organic matter, TN total nitrogen, TP total phosphorus, AP available phosphorus, AK available K.