Table 2.
Effects of crop rotation and continuous cropping on soil enzyme activity parameters.
| Soil enzyme activity | Cultivar | CR | CC | CF | Mean | Cultivar | Cropping system | Cultivar × Cropping system |
|---|---|---|---|---|---|---|---|---|
| R1 growth stage | ||||||||
| URE (mg d−1 g−1) | L10 | 1.12 | 1.16 | 1.40 | 1.23 (0.16)b | ** | ** | * |
| L14 | 1.42 | 1.31 | 1.73 | 1.48 (0.20)a | ||||
| Mean | 1.27 (0.17)b | 1.23 (0.14)b | 1.56 (0.18)a | |||||
| NAG (nM h−1 g−1) | L10 | 14.81 | 10.14 | 14.15 | 13.03 (2.31)b | ** | ** | ns |
| L14 | 17.13 | 12.13 | 15.12 | 14.79 (2.35)a | ||||
| Mean | 15.97 (1.50)a | 11.13 (1.37)c | 14.63 (1.04)b | |||||
| LAP (nM h−1 g−1) | L10 | 21.03 | 18.08 | 15.95 | 18.35 (2.37)b | ** | ** | ns |
| L14 | 24.07 | 20.00 | 18.50 | 20.86 (2.81)a | ||||
| Mean | 22.55 (2.22)a | 19.04 (1.28)b | 17.22 (1.76)c | |||||
| ALP (μmol h−1 g−1) | L10 | 4.18 | 1.04 | 2.81 | 2.68 (1.58)b | ** | ** | ns |
| L14 | 6.30 | 1.58 | 4.11 | 4.00 (2.16)a | ||||
| Mean | 5.24 (1.54)a | 1.31 (0.62)c | 3.46 (0.97)b | |||||
| NPA (μmol h−1 g−1) | L10 | 13.91 | 6.68 | 8.85 | 9.81 (3.35)b | ** | ** | ns |
| L14 | 19.33 | 7.19 | 10.74 | 12.42 (5.75)a | ||||
| Mean | 16.62 (3.83)a | 6.93 (0.98)c | 9.79 (1.39)b | |||||
| ACP (μmol h−1 g−1) | L10 | 124.65 | 58.96 | 122.73 | 102.11 (32.47)b | ** | ** | ns |
| L14 | 138.89 | 74.01 | 134.44 | 115.78 (31.41)a | ||||
| Mean | 131.77 (8.33)a | 66.48 (8.34)c | 128.59 (6.55)b | |||||
| R6 growth stage | ||||||||
| URE (mg d−1 g−1) | L10 | 1.80 | 1.56 | 2.07 | 1.81 (0.23)b | ** | ** | * |
| L14 | 2.11 | 1.85 | 2.56 | 2.17 (0.31)a | ||||
| Mean | 1.95 (0.18)b | 1.71 (0.16)c | 2.32 (0.27)a | |||||
| NAG (nM h−1 g−1) | L10 | 24.13 | 17.47 | 23.15 | 21.58 (3.21)b | ** | ** | ns |
| L14 | 28.40 | 22.64 | 29.14 | 26.73 (3.18)a | ||||
| Mean | 26.26 (2.52)a | 20.05 (2.88)b | 26.15 (3.42)a | |||||
| LAP (nM h−1 g−1) | L10 | 32.73 | 27.90 | 25.65 | 28.76 (3.37)b | ** | ** | ns |
| L14 | 35.29 | 30.49 | 27.52 | 31.10 (3.66)a | ||||
| Mean | 34.01 (2.29)a | 29.19 (1.81)b | 26.58 (1.39)c | |||||
| ALP (μmol h−1 g−1) | L10 | 8.61 | 1.68 | 6.90 | 5.73 (3.25)b | ** | ** | ns |
| L14 | 11.45 | 2.12 | 9.36 | 7.64 (4.33)a | ||||
| Mean | 10.03 (1.76)a | 1.90 (0.61)c | 8.13 (1.84)b | |||||
| NPA (μmol h−1 g−1) | L10 | 26.26 | 8.38 | 10.07 | 14.90 (9.04)a | ns | ** | ns |
| L14 | 30.03 | 8.42 | 13.87 | 17.44 (9.96)a | ||||
| Mean | 28.15 (4.68)a | 8.40 (1.45)b | 11.97 (2.34)b | |||||
| ACP (μmol h−1 g−1) | L10 | 132.19 | 92.63 | 126.90 | 117.24 (18.88)b | ** | ** | ns |
| L14 | 150.91 | 117.34 | 147.68 | 138.64 (16.25)a | ||||
| Mean | 141.55 (10.53)a | 104.98 (13.57)b | 137.29 (12.27)a | |||||
Data are means (n = 3), values in parentheses represent standard deviation of the mean (n = 3). Different lowercase letters indicate significant difference among treatments (p < 0.05). *p < 0.05; **p < 0.01.