Table 3.
Effects of nitrogen supply level on dry matter content of maize varieties with different nitrogen efficiencies
| N level | Cultivar | Trumpet stage (kg/hm2) | Filling stage (kg/hm2) | Maturity (kg/hm2) |
|---|---|---|---|---|
| N0 | ZD958 | 3445.66a | 6814.35b | 9867.43ab |
| XY335 | 2811.26a | 6567.04b | 8598.79bc | |
| YD606 | 2329.08a | 4565.73c | 6476.94c | |
| QL368 | 3426.53a | 8218.65a | 11778.76a | |
| F | 2.22 ns | 16.94** | 6.64* | |
| N90 | ZD958 | 3671.97a | 10370.38ab | 13515.83a |
| XY335 | 3732.19b | 12207.77a | 14867.34a | |
| YD606 | 3507.45a | 9702.00ab | 14012.74a | |
| QL368 | 3565.53a | 9504.18b | 15872.52a | |
| F | 0.88 ns | 2.73 ns | 0.67 ns | |
| N180 | ZD958 | 4202.19a | 11171.13ab | 15204.54b |
| XY335 | 4252.36a | 11014.22ab | 13577.34b | |
| YD606 | 3587.39a | 9322.75b | 15548.42b | |
| QL368 | 3851.00a | 12878.27a | 18649.97a | |
| F | 1.10 ns | 3.32 ns | 6.164* | |
| N270 | ZD958 | 4964.10a | 11497.98a | 16391.80a |
| XY335 | 4348.66a | 12263.84a | 17278.87a | |
| YD606 | 4702.03a | 11661.05a | 15363.65a | |
| QL368 | 4275.75a | 12835.29a | 18297.20a | |
| F | 0.84 ns | 0.31 ns | 0.88 ns | |
| N360 | ZD958 | 4545.51ab | 11026.16a | 14814.16a |
| XY335 | 3991.02b | 12317.56a | 17667.53a | |
| YD606 | 4431.75b | 11703.94a | 14246.56a | |
| QL368 | 5236.37a | 13288.74a | 19278.06a | |
| F | 4.93* | 1.46 ns | 2.38 ns | |
| ANOVA | C | 2.17 ns | 5.75** | 8.45** |
| F | 17.16** | 33.21** | 26.90** | |
| C × F | 1.33 ns | 1.41 ns | 0.95 ns |
Note: Different lowercase letters of different varieties indicate significant differences among varieties (P < 0.05). “*” indicates the significance at the 0.05 level. “**” indicates the significance at the 0.01 level.