TABLE 5.
Effect of nitrogen fertilization level on root bleeding sap and matter transport efficiency of basal-stem internode (MTE) of two maize hybrids at milking stage on N application levels in 2016.
| Genotype | N level | Cross sectional area | vascular bundle area | Root bleeding sap | MTE |
| (mm2) | (mm2) | (mg h–1) | (mg mm–2 h–1) | ||
| XY335 | N0 | 242.7 ± 4.2e | 25.8 ± 1.5c | 537.5 ± 12.1e | 20.0 ± 0.2f |
| N150 | 275.7 ± 7.1d | 32.3 ± 0.7b | 979.2 ± 5.2c | 30.4 ± 0.8d | |
| N300 | 365.3 ± 12.8b | 56.5 ± 0.8a | 2096.9 ± 10.3a | 37.1 ± 0.4a | |
| ZD958 | N0 | 241.1 ± 8.0e | 24.4 ± 0.5c | 626.9 ± 23.5d | 25.7 ± 0.9e |
| N150 | 302.5 ± 8.6c | 30.8 ± 0.9b | 996.9 ± 4.6c | 32.3 ± 0.8c | |
| N300 | 417.9 ± 14.8a | 55.3 ± 2.1a | 1878.1 ± 15.8b | 34.0 ± 0.7b | |
| ANOVA | Nitrogen (N) | *** | *** | *** | *** |
| Genotype (G) | ** | * | ** | *** | |
| N × G | * | NS | *** | *** |
MTE, Matter transport efficiency. N0, N150, and N300 indicate 0, 150, and 300 kg ha–1 N applied, respectively.
Different small letters within a column indicate significant differences between treatments at a 5% level for each tissue position.
*, **, and *** indicate different significance at 5, 1, and 0.1% level, respectively; NS, no significance.