TABLE 4.
Nitrogen accumulation and distribution proportion in different organs at maturity stage of winter wheat in 2018 and 2019 under different nitrogen application rates.
| Year | Treatment | Nitrogen accumulation amount (kg⋅hm–2) | Distribution proportion | ||||||
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| Grain | Plant organs | Grain | Plant organs | ||||||
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| Spike axis+Husk | Leaf+Stem+Sheath | Total | Spike axis+Husk | Leaf+Stem+Sheath | Total | ||||
| 2018 | N0 | 66.14c | 3.24b | 4.34c | 7.58d | 89.72a | 3.49d | 6.10b | 10.28b |
| N75 | 87.40c | 4.47b | 6.35c | 10.82cd | 88.98a | 4.78cd | 6.78b | 11.02b | |
| N150 | 120.56b | 6.35b | 10.15bc | 16.50c | 87.95a | 6.73c | 7.80b | 12.05b | |
| N225 | 173.56a | 10.56a | 14.26b | 24.82b | 97.39a | 10.76b | 7.63b | 12.61b | |
| N300 | 169.87a | 13.59a | 25.00a | 38.59a | 81.60b | 14.27a | 12.77a | 18.40a | |
| 2019 | N0 | 86.24d | 3.74d | 8.85c | 12.59e | 87.27a | 4.11d | 9.30a | 12.73b |
| N75 | 110.26c | 5.10cd | 12.06c | 17.16d | 86.40ab | 5.58cd | 9.98a | 13.60b | |
| N150 | 135.86b | 6.37c | 15.96b | 22.33c | 85.87ab | 6.90c | 10.53a | 14.13b | |
| N225 | 170.65a | 8.56b | 20.67a | 29.23b | 85.28ab | 9.13b | 10.89a | 14.72b | |
| N300 | 168.52a | 11.51a | 22.63a | 34.14a | 83.12b | 12.15a | 11.87a | 16.88a | |
N0: unfertilized control; N75: N application at 75 kg N⋅ha–1; N150: N application at 150 kg N⋅ha–1; N225: N application at 225 kg N⋅ha–1; N300: traditional N application rate of 300 kg N⋅ha–1. Different small letters show significant differences at p < 0.05.