Cumulative diameter growth (mm) for irrigation treatments and species. Data for protection treatments was combined since no significant differences in diameter growth were found for these treatments. Diameter growth for irrigated oaks was significantly greater than that for nonirrigated trees. Nonirrigated Douglas fir trees did not survive.
| Species | Treatment | Diameter (mm) | |||
|---|---|---|---|---|---|
| Yr 1 | Yr 2 | Yr 3 | Yr 4 | ||
| Blue oak | Irrigated | 1.0 | 4.4 | 8.5 | 10.0 |
| Nonirrgated | 0.1 | 1.4 | 2.5 | 4.8 | |
| Live oak | Irrigated | 2.3 | 10.1 | 29.1 | 45.2 |
| Nonirrigated | 0.7 | 3.1 | 6.4 | 9.8 | |
| Valley oak | Irrigated | 2.9 | 8.8 | 19.8 | 24.3 |
| Nonirrigated | 0.6 | 2.4 | 5.2 | 8.8 | |
| Douglas fir | Irrigated | 1.9 | 7.2 | 14.6 | 21.0 |
| Nonirrigated | 1.2 | 0.0 | 0.0 | 0.0 | |