Effect of sky cover on Injectability of mature elm trees.
| Sky cover | ||||
|---|---|---|---|---|
| Clear 0 | Partly .1-.2 | cloudy .4-.7 | Cloudy .9-1.0 | |
| Mean time per tree | ||||
| 1981 | ||||
| Time (hr) | 2.5 | 3.8 | 3.5 | 3.8 |
| No. of trees | 14 | 10 | 4 | 14 |
| 1982 | ||||
| Time (hr) | 2.3 | 2.5 | 2.3 | 3.6 |
| No. of trees | 9 | 12 | 45 | 17 |
| Two-year average | ||||
| Time (hr) | 2.4 | 3.1 | 2.9 | 3.7 |