Table 4. The effect of different N treatments under deep tillage and no-tillage condition on N contents in plant parts of winter wheat in 2014 to 2017.
| Treatments | N content (kg ha−1) | ||||||
|---|---|---|---|---|---|---|---|
| Years | Tillage | Nitrogen | Leaf | Stem+sheath | Glume+spike | Grain | Total plant |
| 2014/15 | DT | 0 | 3.59 de | 12.99 cd | 5.94 e | 119.11 e | 141.68 e |
| 90 | 3.86 d | 12.66 de | 8.55 a | 131.26 bc | 155.47 cd | ||
| 150 | 7.51 a | 14.23 b | 8.27 b | 147.86 a | 180.63 a | ||
| 210 | 5.39 b | 13.59 bc | 6.66 d | 133.58 b | 162.66 bc | ||
| NT | 0 | 3.28 e | 11.12 f | 4.81 f | 108.79 f | 132.97 f | |
| 90 | 4.54 c | 12.74 de | 6.63 d | 123.66 de | 144.37 e | ||
| 150 | 4.77 c | 16.82 a | 7.49 c | 134.46 b | 164.40 b | ||
| 210 | 3.81 d | 12.32 e | 8.23 b | 127.36 cd | 154.08 d | ||
| 2015/16 | DT | 0 | 2.89 e | 10.54 de | 3.49 e | 72.92 c | 89.84 d |
| 90 | 3.85 c | 16.10 c | 6.66 c | 76.26 c | 102.87 c | ||
| 150 | 5.64 a | 21.85 a | 8.87 a | 98.88 a | 135.24 a | ||
| 210 | 4.62 b | 18.15 b | 7.49 b | 83.62 b | 113.88 b | ||
| NT | 0 | 2.65 e | 8.66 f | 3.96 e | 60.38 d | 75.65 e | |
| 90 | 3.33 d | 11.77 d | 5.03 d | 60.59 d | 80.72 e | ||
| 150 | 4.08 c | 15.19 c | 4.74 d | 84.75 b | 108.76 bc | ||
| 210 | 2.75 e | 10.12 e | 2.73 f | 65.44 d | 81.04 e | ||
| 2016/17 | DT | 0 | 2.62 de | 11.82 d | 4.16 de | 92.51 f | 111.11 e |
| 90 | 3.26 cd | 15.23 c | 6.30 c | 104.27 d | 129.06 d | ||
| 150 | 5.77 a | 22.77 a | 9.77 a | 130.89 a | 169.20 a | ||
| 210 | 3.74 c | 15.02 c | 6.39 c | 110.11 c | 135.26 c | ||
| NT | 0 | 2.10 e | 9.23 e | 3.19 f | 83.41 g | 97.93 f | |
| 90 | 2.65 de | 11.37 d | 4.67 d | 92.85 ef | 111.54 e | ||
| 150 | 4.63 b | 16.85 b | 7.71 b | 115.16 b | 144.35 b | ||
| 210 | 2.66 de | 11.70 d | 3.87 e | 96.10 e | 114.33 e | ||
| ANOVA (F-values) | Years (Y) | 76.3∗∗∗ | 15.3∗∗∗ | 172.0∗∗∗ | 2172.6∗∗∗ | 1348.8∗∗∗ | |
| Tillage (T) | 143.2∗∗∗ | 446.5∗∗∗ | 427.9∗∗∗ | 355.4∗∗∗ | 420.5∗∗∗ | ||
| Nitrogen (N) | 179.5∗∗∗ | 405.4∗∗∗ | 288.3∗∗∗ | 347.9∗∗∗ | 404.6∗∗∗ | ||
| Y × T × N | 5.82∗∗∗ | 18.2∗∗∗ | 52.2∗∗∗ | 1.58ns | 1.81ns | ||
Notes.
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.