Circling barrier effects on mean root number (>2mm diameter) for ash and poplar at 30,90, and 150 cm outside the barrier and at equivalent distances for controls.
| Treatment | Poplar | Ash | ||||
|---|---|---|---|---|---|---|
| Distance from barrier (cm) | Distance from barrier (cm) | |||||
| 30 | 90 | 150 | 30 | 90 | 150 | |
| Root number | Root number | |||||
| Biobarrier | 13.3 b | 13.3 b | 8.4 b | 10.1 ab | 8.3 ab | 3.0 |
| Deep Root | 10.6 b | 9.2 b | 6.7 b | 5.6 c | 4.1 c | 1.7 |
| Root Block | 12.0 b | 9.6 b | 6.2 b | 5.8 c | 4.5 be | 1.4 |
| Typar | 11.4b | 11.4 b | 6.6 b | 6.4 be | 4.9 be | 1.4 |
| Control | 19.4 a | 20.5 a | 13.9 a | 11.1 a | 9.7 a | 3.1 |
| n.s. | ||||||
Means within columns followed by same letter are not significantly different using Fisher’s Protected LSD (p =0.05). n.s. = no significant difference. Each mean is calculated across main plot treatments (10 trees). No significant interactions for main x subplots were found.