Table 1. Effect of nitrogen levels and ratios on apparent lodging rate, lodging score and grain yield.
| Year | N level (kg ha -1) | N ratio | Lodging stage α | Lodging angle (°) | Lodging rate (%) | Lodging score | Spikes (104 per ha-1) | Kernels per spike | 1000-kernels weight (g) | Grain yield (kg ha -1) |
|---|---|---|---|---|---|---|---|---|---|---|
| 2012–2013 | 180 | 7:1:2:0 | NL | 0 | 0 | 0 | 447.08d β | 44.02ab | 38.88bc | 7072.22d |
| 5:1:2:2 | DC83 | 15 | 10 | 1.67 | 494.72abc | 41.19bc | 40.72a | 7708.33abc | ||
| 3:1:3:3 | NL | 1 | 0 | 0 | 462.50cd | 42.92abc | 40.18ab | 7391.67bcd | ||
| 225 | 7:1:2:0 | DC83 | 70 | 40 | 32.22 | 506.67ab | 44.58a | 35.28de | 7233.33cd | |
| 5:1:2:2 | DC87 | 20 | 17.5 | 3.89 | 533.33a | 45.34a | 36.03d | 8075.00a | ||
| 3:1:3:3 | NL | 0 | 0 | 0 | 477.50bcd | 45.73a | 38.67c | 7916.67ab | ||
| 270 | 7:1:2:0 | DC75 | 72.5 | 80 | 71.11 | 509.72ab | 40.34c | 34.10e | 6950.00d | |
| 5:1:2:2 | NL | 0 | 0 | 0 | 507.50ab | 43.03abc | 35.99d | 7775.00ab | ||
| 3:1:3:3 | NL | 0 | 0 | 0 | 497.22abc | 40.78c | 36.65d | 7400.00bcd | ||
| 2013–2014 | 180 | 7:1:2:0 | DC65 | 50 | 32.5 | 18.06 | 452.24d | 41.95b | 37.75ab | 7091.67cd |
| 5:1:2:2 | DC65 | 45 | 15 | 7.5 | 478.36bc | 42.68ab | 37.58b | 7650.00abc | ||
| 3:1:3:3 | DC73 | 20 | 15 | 3.33 | 451.69d | 43.86ab | 39.01a | 7633.33abc | ||
| 225 | 7:1:2:0 | DC65 | 72.5 | 55 | 44.31 | 484.47bc | 43.75ab | 36.51b | 7216.67bcd | |
| 5:1:2:2 | DC65 | 65 | 22.5 | 16.25 | 508.91a | 43.40ab | 36.81b | 7833.33a | ||
| 3:1:3:3 | DC65 | 40 | 12.5 | 5.56 | 500.03ab | 44.52ab | 37.05b | 7933.33a | ||
| 270 | 7:1:2:0 | DC65 | 85 | 65 | 57.78 | 469.20cd | 43.57ab | 36.92b | 6991.67d | |
| 5:1:2:2 | DC65 | 77.5 | 55 | 44.31 | 474.19cd | 44.73a | 37.48b | 7791.67ab | ||
| 3:1:3:3 | DC65 | 70 | 55 | 41.25 | 464.47cd | 44.66ab | 37.73ab | 7519.44abcd |
α NL: No lodging; DC65: Anthesis; DC73: Early milk stage; DC75: Medium milk stage; DC83: Early dough stage; DC87: Hard dough stage
β Values in a column followed by the same letter are not significantly different at P < 0.05 as determined by the LSD test. The test was conducted separately between the two years.