Table 5. Yield components of winter wheat grown under deep tillage and no-tillage condition and different N treatments from 2014 to 2017.
| Treatments | Spike no. (104 ha−1) | Grain no. (spike−1) | 1,000 grain weight (g) | GY (t ha−1) | GP (%) | Harvest index | ||
|---|---|---|---|---|---|---|---|---|
| Years | Tillage | Nitrogen | ||||||
| 2014/15 | DT | 0 | 476.0 bc | 31.38 e | 40.52 ab | 4.97 d | 10.78 h | 0.343 c |
| 90 | 482.2 abc | 31.69 d | 39.65 d | 5.06 c | 11.68 f | 0.350 c | ||
| 150 | 506.0 a | 32.61 b | 40.07 c | 5.33 b | 13.61 b | 0.363 ab | ||
| 210 | 493.7 ab | 33.22 a | 40.78 a | 5.78 a | 12.28 d | 0.368 a | ||
| NT | 0 | 446.3 d | 31.06 f | 39.65 d | 4.59 f | 11.36 g | 0.351 bc | |
| 90 | 462.0 cd | 30.94 f | 38.86 e | 4.93 de | 11.97 e | 0.374 a | ||
| 150 | 481.5 abc | 32.25 c | 39.71 d | 4.89 e | 13.96 a | 0.364 ab | ||
| 210 | 476.2 bc | 32.54 b | 40.33 bc | 5.36 b | 12.98 c | 0.369 a | ||
| 2015/16 | DT | 0 | 464.2 de | 31.20 bc | 42.07 b | 4.43 c | 11.93 h | 0.394 bc |
| 90 | 481.7 bcd | 31.53 ab | 40.93 d | 4.48 c | 12.44 f | 0.348 e | ||
| 150 | 526.3 a | 31.75 a | 43.42 a | 5.14 a | 13.67 c | 0.359 de | ||
| 210 | 498.5 b | 29.06 e | 40.74 d | 4.71 b | 13.26 d | 0.373 cd | ||
| NT | 0 | 445.2 e | 27.27 f | 38.42 f | 3.89 e | 12.37 g | 0.398 b | |
| 90 | 464.8 de | 25.12 g | 38.63 f | 3.99 e | 12.98 e | 0.364 de | ||
| 150 | 488.3 bc | 30.90 cd | 41.48 c | 4.70 b | 14.64 a | 0.383 bcd | ||
| 210 | 476.8 cd | 30.50 d | 39.26 e | 4.28 d | 14.08 b | 0.447 a | ||
| 2016/17 | DT | 0 | 470.1 cd | 31.10 de | 40.51 b | 4.57 d | 13.42 c | 0.344 b |
| 90 | 481.9 bcd | 31.37 cd | 40.52 b | 4.88 c | 13.49 c | 0.340 b | ||
| 150 | 516.2 a | 32.09 a | 42.05 a | 5.57 a | 14.04 b | 0.370 a | ||
| 210 | 496.1 ab | 31.59 bc | 40.86 b | 4.99 b | 14.38 a | 0.339 b | ||
| NT | 0 | 445.7 e | 30.90 e | 38.57 d | 4.15 f | 13.56 c | 0.344 b | |
| 90 | 463.4 de | 31.02 e | 39.16 c | 4.42 e | 13.65 c | 0.336 b | ||
| 150 | 484.9 bc | 31.87 ab | 41.91 a | 5.08 b | 14.37 a | 0.361 a | ||
| 210 | 476.5 bcd | 30.43 f | 39.51 c | 4.46 de | 14.11 b | 0.304 c | ||
| ANOVA (F-values) | Years (Y) | 0.29ns | 854.6∗∗∗ | 55.51∗∗∗ | 633.7∗∗∗ | 2157.4∗∗∗ | 102.6∗∗∗ | |
| Tillage (T) | 63.86∗∗∗ | 606.4∗∗∗ | 686.9∗∗∗ | 814.1∗∗∗ | 348.8∗∗∗ | 13.88∗∗∗ | ||
| Nitrogen (N) | 38.87∗∗∗ | 255.1∗∗∗ | 223.4∗∗∗ | 409.1∗∗∗ | 1764.8∗∗∗ | 8.76∗∗∗ | ||
| Y ×T ×N | 0.26ns | 166.2∗∗∗ | 7.37∗∗∗ | 3.56∗∗ | 9.17∗∗∗ | 9.74∗∗∗ | ||
Notes.
- GY
- grain yield
- GP
- grain protein content
Values are the means of three replicates; *, **, *** significant at 0.05, 0.01 and 0.001 probability level, respectively. Different letters in the column indicate significant difference among treatments at p < 0.05 by the LSD test.