TABLE 6.
Effect of nitrogen (N) application rates on number of ears per hectare, grains per spike, 1000-grain weights, and grain yield of winter wheat during 2018 and 2019.
| Year | Treatment | Number of ears (10000 ha–1) | Grains per spikes | 1000-grain weight (g) | Grain yield (kg⋅ha–1) |
| 2018 | N0 | 480.01d | 30.96c | 34.90d | 5102.61d |
| N75 | 503.89c | 33.48b | 35.61c | 6006.38c | |
| N150 | 509.44bc | 35.40a | 35.90c | 6480.00b | |
| N225 | 521.44b | 34.68ab | 36.86a | 6600.00a | |
| N300 | 535.15a | 33.84b | 36.37b | 6510.00b | |
| 2019 | N0 | 473.89e | 28.70d | 37.97d | 4104.16d |
| N75 | 487.78d | 31.97c | 43.62c | 5254.69c | |
| N150 | 496.11c | 33.80ab | 48.20ab | 6500.86b | |
| N225 | 505.00b | 34.57a | 49.75a | 6845.47a | |
| N300 | 516.67a | 33.00b | 47.70b | 6405.68b |
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.