Average irrigation demand (AID) of five container-grown urban tree species.
| Species | AID (liters/container)z | Chi-sq.y | |||
|---|---|---|---|---|---|
| June | July | Aug. | Total | ||
| Red maple | 4.3a | 5.7a | 5.3a | 15.3a | .26 |
| Green ash | 4.4a | 5.5ab | 4.7b | 14.6ab | .03 |
| W. hawthorn | 3.5b | 5.0bc | 4.9ab | 13.4b | .30 |
| Honeylocust | 3.0c | 4.7c | 4.5b | 12.2c | .31 |
| Fl.crabapple | 3.2bc | 3.9d | 3.5c | 10.6d | .02 |
↵z Each value represents the mean of 15 seedlings. AID determined by subtracting the volume of leachate collected from the volume of water applied per seedling. Mean values in a column followed by the same letter are not significantly different, LSD 0.05.
↵y Chi-square comparison of AID distribution with potential evapotranspiration (ETp), df=2. All values non-significant. ETp calculations for June, July and August were 10.6,11,4 and 10.3, respectively, as computed by the Thornthwaite equation.