Table 3.
Effects of nitrogen levels on weighted average of surface area and volume of superior and inferior grains of maize.
| Year | Hybrid | N Treatment | Surface area (μm2) | Volume (μm3) | ||
|---|---|---|---|---|---|---|
| kg ha−1 | Superior | Inferior | Superior | Inferior | ||
| 2010 | Suyu20 | 0 | 6.45 ± 0.12g | 6.34 ± 0.12i | 17.5 ± 0.13lm | 12.68 ± 0.49n |
| 360 | 7.68 ± 0.13cde | 7.02 ± 0.10cde | 19.36 ± 0.10i | 14.43 ± 0.29j | ||
| 450 | 8.46 ± 0.11a | 6.65 ± 0.06fghi | 24.74 ± 0.17c | 15.85 ± 0.37cd | ||
| 540 | 6.08 ± 0.10h | 6.41 ± 0.06hi | 16.56 ± 0.13n | 15.38 ± 0.12f | ||
| Suyu29 | 0 | 7.78 ± 0.12cde | 7.64 ± 0.09a | 20.42 ± 0.39g | 15.68 ± 0.14e | |
| 360 | 7.45 ± 0.10e | 6.57 ± 0.13ghi | 17.36 ± 0.11m | 14.39 ± 0.08j | ||
| 450 | 8.57 ± 0.15a | 7.15 ± 0.11bcd | 25.15 ± 0.09b | 15.91 ± 0.09c | ||
| 540 | 7.55 ± 0.1de | 7.27 ± 0.09bc | 16.54 ± 0.12n | 15.26 ± 0.07g | ||
| 2012 | Suyu30 | 0 | 6.99 ± 0.20f | 6.44 ± 0.23ghi | 14.96 ± 0.28o | 12.75 ± 0.35n |
| 360 | 7.48 ± 0.12e | 7.28 ± 0.18bc | 20.12 ± 0.24h | 16.71 ± 0.27b | ||
| 450 | 7.83 ± 0.29cd | 6.74 ± 0.17efg | 23.74 ± 0.37d | 14.46 ± 0.35j | ||
| 540 | 7.04 ± 0.26f | 7.01 ± 0.22cde | 18.37 ± 0.32k | 17.54 ± 0.29a | ||
| Suyu20 | 0 | 6.50 ± 0.20g | 6.63 ± 0.2fghi | 16.5 ± 0.29n | 13.15 ± 0.25m | |
| 360 | 7.71 ± 0.15cde | 6.90 ± 0.23def | 19.42 ± 0.26i | 14.25 ± 0.36k | ||
| 450 | 8.28 ± 0.14ab | 6.66 ± 0.15fgh | 22.35 ± 0.29e | 13.99 ± 0.16l | ||
| 540 | 7.07 ± 0.19f | 6.75 ± 0.17efg | 14.84 ± 0.3o | 14.8 ± 0.42i | ||
| Suyu29 | 0 | 7.96 ± 0.13bc | 6.9 ± 0.28def | 19.14 ± 0.23j | 15.17 ± 0.32gh | |
| 360 | 7.75 ± 0.15cde | 7.08 ± 0.26cd | 22.19 ± 0.27f | 15.11 ± 0.24h | ||
| 450 | 8.35 ± 0.17a | 7.18 ± 0.27bcd | 26.92 ± 0.41a | 15.84 ± 0.41cd | ||
| 540 | 7.48 ± 0.14e | 7.42 ± 0.22ab | 17.58 ± 0.38l | 15.79 ± 0.28de | ||
| F-value | R2 | 0.684** | 0.753** | 0.997** | 0.979** | |
| Year | 1.24NS | 1.15NS | 8.14NS | 12.91NS | ||
| Hybrid | 13.52** | 38.76** | 502.52* | 269.54* | ||
| N treatment | 29.13** | 30.61** | 4721.69* | 483.25* | ||
| Year × Hybrid | 0.51NS | 1.65NS | 621.02** | 47.74** | ||
| Year × N treatment | 1.44NS | 7.09** | 27.79** | 42.29** | ||
| Cultivar × N treatment | 3.04* | 3.84** | 121.08** | 122.38** | ||
| Year × Hybrid × N treatment | 1.71NS | 1.03NS | 19.31** | 21.74** | ||
Means in the same column followed by the same letter do not differ statistically at the 0.05 probability level by an ANOVA protected Duncan’s test; *,**NS Significantly different at the 0.05 and 0. 01 probability levels and no significant difference, respectively.