TABLE 6.
Agronomic efficiency of applied N (AEN), partial factor productivity of applied N (PFPN), and crop recovery efficiency of applied N (REN) in Jingzhou and Suizhou.
| Year (Y) | Treatment (T) | AEN (kg/kg) |
PFPN (kg/kg) |
REN (%) |
|||
| Jingzhou | Suizhou | Jingzhou | Suizhou | Jingzhou | Suizhou | ||
| 2017 | FP | 12.12 c | 18.88 b | 45.11 b | 59.56 a | 50.98 a | 66.09 a |
| OPT–N | 16.11 a | 22.95 a | 51.64 a | 60.51 a | 57.46 b | 63.39 b | |
| OPT+N | 15.64 a | 22.76 a | 41.30 c | 51.48 b | 39.60 c | 22.65 c | |
| Mean | 14.62 | 21.53 | 46.02 | 57.18 | 49.35 | 50.71 | |
| 2018 | FP | 10.83 c | 4.89 c | 41.54 c | 37.37 c | 31.18 c | 59.45 c |
| OPT–N | 15.81 b | 11.98 b | 51.79 a | 50.72 a | 54.19 b | 90.89 b | |
| OPT+N | 17.56 a | 15.16 a | 44.23 b | 45.29 b | 66.63 a | 95.22 a | |
| Mean | 14.73 | 10.68 | 45.85 | 44.46 | 50.67 | 81.85 | |
| 2019 | FP | 9.19 c | 4.90 c | 36.03 c | 35.90 c | 34.24 c | 61.23 c |
| OPT–N | 15.90 b | 10.66 b | 48.03 a | 47.64 a | 51.16 b | 109.13 b | |
| OPT+N | 17.41 a | 12.29 a | 40.62 b | 41.05 b | 65.48 a | 123.14 a | |
| Mean | 14.17 | 9.28 | 41.56 | 41.53 | 50.29 | 97.83 | |
| 2020 | FP | 9.56 c | – | 38.89 c | – | 29.15 c | – |
| OPT–N | 15.11 b | – | 46.70 a | – | 41.86 b | – | |
| OPT+N | 17.38 a | – | 40.20 b | – | 48.73 a | – | |
| Mean | 14.02 | – | 41.93 | – | 33.91 | – | |
| Analysis of variance | Year (Y) | 0.25 | 140.42** | 15.03** | 268.94** | 2.33 | 8.88** |
| Treatment (T) | 55.36 | 7.52** | 81.00** | 16.13** | 11.02 | 2.69 | |
| Y × T | 12.83** | 15.26** | 24.02** | 14.22** | 24.13** | 128.07** | |
Different lowercase letters within columns indicate significant differences at P < 0.05; *P < 0.05; **P < 0.01. ns, not significant.