TABLE 2.
Grain yield (GY) and yield components at Jingzhou.
| Year (Y) | Treatment (T) | GY (t ha–1) | P (m2) | SP | GF (%) | GW (mg) | HI (%) |
| 2017 | CK | 6.93 d | 180 d | 191.0 d | 85.4 a | 22.2 a | 51.4 a |
| FP | 9.47 c | 227 c | 219.8 c | 82.9 b | 22.3 a | 47.4 b | |
| OPT–N | 10.07 b | 233 b | 230.1 b | 80.7 c | 21.8 b | 47.9 b | |
| OPT+N | 11.15 a | 256 a | 244.3 a | 78.2 d | 21.7 b | 46.5 c | |
| Mean | 9.4 | 224 | 221.3 | 81.8 | 22.0 | 48.3 | |
| 2018 | CK | 7.01 d | 221 c | 191.3 c | 84.5 a | 20.9 b | 46.8 b |
| FP | 9.29 c | 245 b | 218.7 b | 82.6 bc | 21.4 a | 50.5 a | |
| OPT–N | 10.10 b | 258 ab | 226.6 b | 82.5 c | 21.7 a | 50.9 a | |
| OPT+N | 11.22 a | 277 a | 241.9 a | 82.4 ab | 21.5 a | 49.5 a | |
| Mean | 9.4 | 250 | 219.6 | 83.0 | 21.4 | 49.4 | |
| 2019 | CK | 6.27 d | 190 c | 196.8 d | 81.1 a | 20.2 b | 45.8 b |
| FP | 7.57 c | 230 b | 241.1 c | 75.2 c | 20.4 ab | 46.9 ab | |
| OPT–N | 9.37 b | 263 a | 259.8 b | 76.6 c | 20.9 4 a | 45.6 b | |
| OPT+N | 10.97 a | 271 a | 272.1 a | 79.3 b | 20.4 ab | 48.5 a | |
| Mean | 8.5 | 238 | 242.5 | 78.0 | 20.5 | 46.7 | |
| 2020 | CK | 6.16 d | 168 d | 246.7 c | 79.6 a | 19.3 c | 47.3 a |
| FP | 8.17 c | 216 c | 263.2 bc | 74.3 b | 20.0 b | 45.5 c | |
| OPT–N | 9.11 b | 231 b | 276.4 ab | 75.1 b | 20.7 a | 46.3 b | |
| OPT+N | 10.85 a | 275 a | 306.7 a | 74.3 b | 20.6 a | 45.7 c | |
| Mean | 8.6 | 222 | 273.3 | 75.8 | 20.1 | 46.2 | |
| Analysis of variance | Year (Y) | 0.97 | 19** | 98.45** | 22.37** | 54.01** | 9.51** |
| Treatment (T) | 147.73** | 59** | 13.25** | 1.08 | 4.03* | 0.04 | |
| Y × T | 16.27** | 12** | 4.15** | 6.05** | 10.15** | 12.84** |
P, panicles; SP, spikelets per panicle; GF, grain filling; GW, grain weight; HI, harvest index; ns, not significant. Lowercase letters within columns indicate significant differences at P < 0.05; *P < 0.05; **P < 0.01.