Table 3.
Soil physical properties in 0–20 cm depth.
| Rotation | aSand | Slit | Clay | MWD | Bulk density |
|---|---|---|---|---|---|
| (g/kg) | (g/kg) | (g/kg) | (mm) | (g/cm3) | |
| CK | 40.9b | 650.9 | 300.0b | 0.07b | 1.20b |
| RC | 89.4a | 574.5 | 336.1b | 0.11a | 1.39a |
| RR | 51.4b | 559.2 | 389.4a | 0.08b | 1.26ab |
| RP | 76.2a | 586.2 | 337.5b | 0.10a | 1.21b |
| ROM | 54.6b | 551.5 | 393.9a | 0.08b | 1.21b |
| ROF | 42.6b | 531.4 | 426.0a | 0.06b | 1.35a |
aSand 2–0.05 mm, silt 0.05–0.002 mm, clay < 0.002 mm.
Means on the same column and for the same sampling time followed by the same letter (or none) are not significantly different at P < 0.05 by Tukey Test. Abbreviations: CK: rice-fallow phase; RR: rice-ryegrass; RP: rice-potato, with rice straw as mulch; RC: rice-Chinese milk vetch; ROM: rice-oilseed rape with burned straw return after harvest; ROF: rice-oilseed rape with fresh straw return as mulch at flowering.