TABLE 4.
Differences of C and N accumulation proportions pre- and post-anthesis and post-/pre- ratio under different treatments.
| Cultivar | Nitrogen rate | Nitrogen accumulation |
Carbon accumulation |
||||
| Pre-anthesis (%) | Post-anthesis (%) | Post-/Pre- | Pre-anthesis (%) | Post-anthesis (%) | Post-/Pre- | ||
| 2019 | |||||||
| N 0 | 63.58 b | 36.42 a | 0.57 a | 36.82 e | 63.18 a | 1.72 a | |
| N 120 | 62.18 b | 37.82 a | 0.61 a | 38.03 e | 61.97 a | 1.63 b | |
| ZH 311 | N 240 | 72.11 a | 27.89 b | 0.39 d | 39.63 d | 60.37 b | 1.52 c |
| N 360 | 65.94 b | 34.09 a | 0.52 c | 37.03 e | 62.97 a | 1.70 ab | |
| Mean | 65.95 B | 34.05 A | 0.52 A | 37.88 B | 62.12 A | 1.64 A | |
| N 0 | 65.76 b | 34.24 a | 0.52 c | 42.52 b | 57.48 d | 1.35 e | |
| N 120 | 74.93 a | 25.07 b | 0.33 e | 48.48 a | 51.52 e | 1.06 f | |
| XY 508 | N 240 | 72.86 a | 27.14 b | 0.37 d | 41.74 bc | 58.26 cd | 1.39 de |
| N 360 | 71.80 a | 28.20 b | 0.39 d | 40.89 cd | 59.11 bc | 1.45 d | |
| Mean | 71.34 A | 28.66 B | 0.40 B | 43.41 A | 56.59 B | 1.31 B | |
| 2020 | |||||||
| N 0 | 54.75 d | 45.25 a | 0.83 a | 48.45 c | 51.55 a | 1.06 ab | |
| N 120 | 64.05 bc | 35.95 bc | 0.56 bc | 48.20 c | 51.80 a | 1.07 ab | |
| ZH 311 | N 240 | 65.34 b | 34.66 c | 0.53 cd | 47.82 c | 52.18 a | 1.09 ab |
| N 360 | 65.17 b | 34.83 c | 0.53 cd | 47.64 c | 52.36 a | 1.10 a | |
| Mean | 62.33 B | 37.67 A | 0.61 A | 48.03 B | 51.97 A | 1.08 A | |
| N 0 | 55.82 d | 44.18 a | 0.79 a | 53.98 a | 46.02 c | 0.85 e | |
| N 120 | 68.85 a | 31.15 d | 0.45 e | 51.46 b | 48.54 b | 0.95 d | |
| XY 508 | N 240 | 68.14 a | 31.86 d | 0.47 de | 48.74 c | 51.26 a | 1.05 bc |
| N 360 | 62.10 c | 37.90 b | 0.61 b | 49.37 c | 50.63 a | 1.02 c | |
| Mean | 63.73 A | 36.27 B | 0.58 B | 50.89 A | 49.11 B | 0.97 B | |
| F value | Years (Y) | 54.93** | 54.93** | 216.99** | 983.63** | 983.63** | 2266.62** |
| Cultivar (C) | 20.06** | 20.06** | 65.16** | 223.14** | 223.14** | 535.78** | |
| Nitrogen (N) | 29.93** | 29.93** | 126.01** | 18.70** | 18.70** | 35.99** | |
| Y × C | 6.95* | 6.95* | 22.07** | 22.54** | 22.54** | 131.92** | |
| Y × N | 3.88* | 3.88* | 26.56** | 15.30** | 15.30** | 33.45** | |
| C × N | 5.61** | 5.61** | 18.14** | 19.19** | 19.19** | 39.98** | |
| Y × C × N | 3.09* | 3.09* | 10.43** | 7.70** | 7.70** | 16.10** | |
Values followed by different lowercase letters are significantly different with p < 0.05; within cultivars, values with different uppercase letters are significantly different with p < 0.05 according to the least significant difference test. **p < 0.01; *p < 0.05. The bold values are the mean value of one cultivar in different N treatments.