TABLE 2.
Effects of a continuous nitrogen fertilizer supply on rhizosphere soil characteristics.
| Treatment | pH |
C/N ratio (%) |
NO3– (mg/kg) |
||||||
| 1st Year | 5th Year | 10th Year | 1st Year | 5th Year | 10th Year | 1st Year | 5th Year | 10th Year | |
| N0 | 7.44a | 7.40a | 7.31a | 5.59a | 11.73a | 14.08a | 11.26d | 12.51d | 9.89e |
| N120 | 7.37a | 7.25b | 7.06b | 5.16a | 5.41b | 6.84b | 29.74c | 26.99c | 22.06d |
| N180 | 7.31a | 7.23b | 7.17ab | 4.20bc | 5.98b | 5.95bc | 32.58bc | 30.64c | 32.36c |
| N240 | 7.27a | 7.21b | 7.05b | 4.06c | 4.81b | 6.01bc | 34.59b | 38.99b | 40.08b |
| N360 | 7.34a | 7.24b | 7.00b | 4.86ab | 4.61b | 4.54c | 40.72a | 51.79a | 50.19a |
Different lowercase letters after the same column value indicate that the difference between the various treatments under the same crop reached a significant level (P < 0.05). Chao reflects community richness and Shannon reflects community diversity. Five N treatments: N0 (0 kg N hm–2), N120 (120 kg N hm–2), N180 (180 kg N hm–2), N240 (240 kg N hm–2), N360 (360 kg N hm–2).