Table 1.
Influence of ultraviolet‐B radiation on cotton vegetative growth parameters
| UV‐B treatment (kJ m–2 d–1) | ||||
| Vegetative character | 0 | 8 | 16 | s.e.d |
| Plant height (m) | 1·52 | 1·45 | 0·80 | 0·032*** |
| Node number (per plant) | 17·70 | 18·20 | 17·70 | 0·29 |
| Branch number (per plant) | 14 | 16 | 14 | 0·6 |
| Total branch length (m per plant) | 3·39 | 4·76 | 1·74 | 0·284*** |
| Fully mature leaf area (cm2) | 158·10 | 133·80 | 110·00 | 6·52** |
Plant height, node number, and branch number and lengths were measured at the final harvest, 66 d after emergence. Leaf area is from the fully expanded fourth or fifth leaf on the mainstem used for stomatal measurements.
*** P ≤ 0·001; ** P ≤ 0·01; * P ≤ 0·05.