Table 2.
Physicochemical properties of the rhizosphere soil of sorghum in different crop rotation patterns.
| Soil physicochemical parameters | Control | Treatment | |
|---|---|---|---|
| SSS | SRS | SMS | |
| pH | 6.29 ± 0.20c | 7.47 ± 0.58a | 6.70 ± 0.85b |
| Organic matter (g·kg−1) | 41.98 ± 0.33a | 50.90 ± 1.41a | 49.55 ± 1.49a |
| Total nitrogen (g·kg−1) | 2.53 ± 1.14a | 2.99 ± 0.85a | 2.98 ± 0.72a |
| Total phosphorus (g·kg−1) | 1.41 ± 1.35b | 1.47 ± 0.46b | 1.72 ± 0.25a |
| Total potassium (g·kg−1) | 25.90 ± 0.27b | 26.70 ± 0.30b | 27.30 ± 0.42a |
| Available nitrogen (mg·kg–1) | 165.00 ± 4.45a | 166.00 ± 2.52a | 169.00 ± 2.52a |
| Available phosphorus (mg·kg–1) | 100.90 ± 17.7b | 71.70 ± 0.71c | 151.60 ± 1.78a |
| Available potassium (mg·kg–1) | 438.00 ± 5.80a | 211.00 ± 5.75c | 420.00 ± 4.98b |
| Urease (μg·g−1·d−1) | 414.20 ± 13.69b | 575.60 ± 4.73a | 365.10 ± 07.6c |
| Invertase (μg·g−1·d−1) | 31.40 ± 1.59b | 43.07 ± 1.67a | 26.51 ± 1.16c |
SSS, continuous sorghum cropping; SRS, sorghum–rapeseed crop rotation; SMS, sorghum–stem mustard–sorghum crop rotation. Different lowercase letters indicate significant differences among the treatments in the same soil layer (p < 0.05).