Subsurface barrier effects on mean root depth (cm) at 30,90, and 150 cm outside barriers.
| Treatment | Poplar | Ash | ||||
|---|---|---|---|---|---|---|
| Distance from barrier (cm) | Distance from barrier (cm) | |||||
| 30 | 90 | 150 | 30 | 90 | 150 | |
| Root depth (cm) | Root depth (cm) | |||||
| With subsurface barrier | 28.3 a | 17.9 a | 12.1 | 24.3 a | 16.4 a | 11.7a |
| Without subsurface barrier | 20.3 b | 10.8 b | 9.5 | 16.1b | 8.3 b | 6.0 b |
| n.s. | ||||||
Means within columns followed by the same letter are not significantly different using Fisher’s Protected LSD (p=0.05). n.s = not significantly different. Means calculated across subtreatments and block (25 trees). There were no significant main x subplot interactions.