Cultivation effects (subsurface barrier treatments) on mean root number in 0-15 cm depth at 30,90, and 150 cm from outside of barriers for circling barrier treatments and controls combined.
| Poplar | Ash | |||||
|---|---|---|---|---|---|---|
| 30 | 90 | 150 | 30 | 90 | 150 | |
| Cultivation (with subsurface barrier) | 2.0 a | 4.6 a | 4.3 a | 1.8 a | 3.3 a | 1.6 |
| No cultivation (without subsurface barrier) | 5.4 b | 11.3b | 8.2 b | 5.3 b | 5.5 b | 1.3 |
| 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 from all treatments and replicates combined over each main plot (25 trees) and there were no significant interactions.