Table 2.
Soil chemical properties and potential ammonia oxidation as influenced by fertilization and irrigation in 2018.
| Treatments | pH | SOC (g kg-1) | TN (g kg-1) | NO-3-N (mg kg-1) | NH4+-N (mg kg-1) | PAO (μg NO–2N g-1 d.w.day-1) |
|---|---|---|---|---|---|---|
| T0 | 5.97 ± 0.08b | 15.16 ± 0.10b | 2.18 ± 0.25a | 13.20 ± 0.77b | 35.14 ± 6.12b | 0.004 ± 0.002b |
| T1 | 6.01 ± 0.08b | 15.33 ± 0.13b | 2.00 ± 0.12a | 18.74 ± 2.94a | 59.64 ± 5.53a | 0.010 ± 0.002a |
| T2 | 6.24 ± 0.11a | 15.98 ± 0.18a | 1.84 ± 0.16a | 6.37 ± 0.96c | 51.55 ± 7.43a | 0.011 ± 0.004a |
T0 = Traditional irrigation; T1 = Traditional irrigation and fertilization practice; T2 = Water-saving irrigation and optimizing fertilization. SOC: soil organic carbon; N: nitrogen; TN: total N; NO3-—N: nitrate N; NH4+—N: ammonium N; PAO: potential ammonia oxidation. Values (means ± SD) with different lower-case letters in a column are significantly different at P < 0.05 according to the Duncan test.