Table 4.
Effects of density and nitrogen application rate on 13C-photosynthate proportional allocation among the above-ground plant organs (%) at maturity stage during the 2014 and 2015 growing seasons.
| Factors | 13C-photosynthate distribution in different organs (%) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2014 | 2015 | ||||||||||||
| Stem | Other leaves | Ear leaf | Tassel | Bract + Cob | Grain | Stem | Other leaves | Ear leaf | Tassel | Bract + Cob | Grain | ||
| DH618 | |||||||||||||
| LD | N0 | 19.27b | 11.55b | 2.16a | 1.00b | 10.67d | 55.34d | 20.65b | 11.74b | 2.13c | 1.11c | 10.69g | 53.68f |
| N180 | 16.07e | 9.03e | 1.76c | 0.72f | 10.95c | 61.47a | 17.06e | 10.29e | 1.67ef | 1.22a | 10.88f | 58.88a | |
| N270 | – | 17.15e | 10.50d | 1.52g | 1.13c | 11.18e | 58.53b | ||||||
| N360 | 16.72d | 9.53d | 1.83b | 0.73e | 11.5a | 59.69b | 17.60d | 9.88f | 2.19b | 1.19b | 11.35d | 57.81c | |
| HD | N0 | 21.83a | 11.84a | 2.16a | 1.12a | 10.1e | 52.93e | 21.93a | 12.20a | 2.24a | 0.9d | 11.45cd | 51.28g |
| N180 | 17.75c | 10.38c | 1.70d | 0.87c | 10.98c | 58.33c | 18.64c | 11.00c | 1.76d | 0.67e | 11.53c | 56.39e | |
| N270 | – | 18.27d | 10.88 | 1.70e | 0.67e | 11.97b | 56.52d | ||||||
| N360 | 17.53c | 10.59c | 1.54e | 0.78d | 11.28b | 58.28c | 18.14d | 10.90c | 1.65f | 0.64e | 12.3a | 56.36e | |
| DH605 | |||||||||||||
| LD | N0 | 20.25b | 10.66b | 1.88a | 0.90c | 13.46b | 52.85c | 19.17c | 10.08b | 1.9b | 0.95b | 11.96a | 55.94e |
| N180 | 17.31e | 9.41d | 1.80abc | 0.78d | 12.88e | 57.82a | 17.61g | 9.50g | 1.57f | 0.8f | 11.58c | 58.95a | |
| N270 | – | 17.86f | 9.48g | 1.55e | 0.82f | 11.48cd | 58.81a | ||||||
| N360 | 17.34e | 9.63d | 1.77bc | 0.79d | 13.34c | 57.13a | 17.97f | 9.61f | 1.53e | 0.82g | 11.71b | 58.36b | |
| HD | N0 | 21.16a | 11.56a | 1.88a | 0.94a | 13.79a | 50.67d | 20.92a | 10.85a | 2.22a | 1.05a | 11.70b | 53.26f |
| N180 | 19.61c | 10.11c | 1.83ab | 0.91b | 13.12d | 54.41b | 19.39b | 9.93c | 1.74d | 0.88e | 11.57c | 56.48d | |
| N270 | – | 18.77e | 9.82d | 1.76c | 0.89d | 11.44d | 57.31c | ||||||
| N360 | 19.25d | 10.01c | 1.73c | 0.89c | 13.31c | 54.82b | 18.95d | 9.69e | 1.79d | 0.88c | 11.55cd | 57.14c | |
| ANOVA | |||||||||||||
| Density (D) | 916.4*** | 184.5*** | 23.4*** | 2,328.9*** | 2.8 ns | 174.1*** | 2,932.0*** | 629.3*** | 375.8*** | 2,226.2*** | 419.5*** | 3091*** | |
| N rate (N) | 1221*** | 332*** | 231.8*** | 3,762.1*** | 132.2*** | 292.5*** | 3,085.4*** | 698.1*** | 1,841.4*** | 227.2*** | 70.9*** | 3,065.3*** | |
| Variety (V) | 293.5*** | 20.2*** | 11.6** | 2.8 ns | 1,2841.3*** | 264.9*** | 42.4*** | 2515*** | 382.1*** | 195.8*** | 102.0*** | 565.0*** | |
| D × N | 10.8*** | 4.9* | 18.2*** | 92.1*** | 16.5*** | 5.0* | 87.2*** | 7.1** | 247.3*** | 122.8*** | 7.5** | 59.0*** | |
| D × V | 0 ns | 4.4* | 20*** | 7.7* | 103.4*** | 0.7 ns | 23.4*** | 32.6*** | 747.2*** | 4,566.2*** | 731.2*** | 5.5* | |
| N × V | 56.2*** | 10.4** | 91.9*** | 1,294.8*** | 389.3*** | 4.7* | 409.3** | 61.1* | 161.5*** | 30.3*** | 178.8*** | 139.8*** | |
| D × N × V | 58.2*** | 13.7*** | 8.2** | 88.2*** | 28.9*** | 0.8 ns | 11.6*** | 39.8*** | 291.7*** | 92.7*** | 8.4*** | 8.0*** | |
Different lowercase letters indicate a significant difference (p < 0.05) with the same organ of the same variety among treatments. The numbers in the ANOVA section represent F values. ns, not significant. *Significant at the 0.05 probability level.**Significant at the 0.01 probability level. ***Significant at the 0.001 probability level.