TABLE 3.
Effect of planting density and nitrogen application on yield components of maize in 2015 and 2016.
| Year | Planting density | N level | Kernel number | 1000-Kernel weight | Grain yield |
| (ear–1) | (g) | (Mg ha–1) | |||
| 2015 | ND | N0 | 457.0d | 285.9e | 5.2f |
| N150 | 535.7b | 316.0c | 7.4d | ||
| N300 | 573.0a | 351.2a | 9.2b | ||
| HD | N0 | 344.2f | 279.9e | 6.5e | |
| N150 | 435.2e | 305.7d | 8.7c | ||
| N300 | 459.3c | 334.4b | 11.0a | ||
| 2016 | ND | N0 | 424.0c | 293.9d | 5.1f |
| N150 | 529.7a | 318.3c | 9.4d | ||
| N300 | 540.4a | 372.4a | 11.9b | ||
| HD | N0 | 342.0d | 292.3d | 7.0e | |
| N150 | 503.7b | 317.1c | 10.8c | ||
| N300 | 506.9b | 333.1b | 12.3a | ||
| ANOVA | |||||
| Year (Y) | ns | *** | *** | ||
| Plant density (D) | *** | *** | *** | ||
| N level (N) | *** | *** | *** | ||
| D × N | ns | *** | *** | ||
| Y × D × N | *** | *** | *** | ||
ND and HD indicate planting density of 67,500 and 90,000 plants ha–1; N0, N150, and N300 indicate N applied at 0, 150, and 300 kg ha–1 levels, respectively. Values of six treatments followed by different letters indicate significant difference at 5% level. ns, no significance; *, **, and *** indicate significance at 5%, 1%, and 0.1% level, respectively.