Table 3.
Culm dry weight, culm dry weight per unit length, and culm dry weight per unit volume of lower internodes under the two nitrogen fertilizer management practices.
| Variety | Nitrogen management practices | Dry weight of internode (mg) | Dry weight per unit length of internode (mg cm−1) | Dry weight per unit volume of internode (mg cm−3) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| I1 | I2 | I3 | I1 | I2 | I3 | I1 | I2 | I3 | ||
| YJRZ | FFP | 65.6 ± 2.9a* | 93.2 ± 3.6a | 126.1 ± 6.7a | 19.5 ± 1.4b | 11.9 ± 0.8b | 7.6 ± 0.6b | 131.6 ± 3.5a | 115.3 ± 3.2a | 101.6 ± 2.0b |
| OPT | 69.4 ± 4.5a | 110.5 ± 7.6a | 145.6 ± 5.9a | 25.2 ± 0.7a | 16.8 ± 0.5a | 11.3 ± 0.5a | 150.9 ± 9.8a | 125.4 ± 6.5a | 114.6 ± 1.5a | |
| %** | 5.8 | 18.6 | 15.5 | 29.4 | 40.9 | 48.8 | 14.6 | 8.8 | 12.8 | |
| YZ889 | FFP | 55.9 ± 4.6a | 103.8 ± 7.6a | 126.3 ± 9.4b | 15.7 ± 1.4b | 12.6 ± 1.4b | 7.1 ± 0.4b | 223.7 ± 18.4a | 205.5 ± 38.2a | 123.8 ± 9.9a |
| OPT | 70.3 ± 6.5a | 114.4 ± 10.2a | 164.1 ± 8.0a | 21.1 ± 1.2a | 16.4 ± 0.4a | 11.7 ± 0.2a | 212.5 ± 16.3a | 190.0 ± 9.7a | 141.0 ± 6.3a | |
| % | 25.8 | 10.1 | 29.9 | 34.4 | 29.5 | 65.5 | −5.0 | −7.6 | 13.9 | |
Note: I1, I2 and I3 denote the 1st–3rd internodes being counted upwards from the base. *Mean ± standard error, values within a column followed by different letters are significantly different at the 0.05 probability level for a given variety. **Percent change of a certain trait under OPT is relative to that of FFP for a given variety.