Effects of five root barrier treatments on mean number of roots 1.25 cm (0.5 in) or greater diameter for two tree species averaged over five radial distance zones from the trunk 6 years after planting, Riverside, CA, 1998.
| Barrier | Mean no. of roots |
|---|---|
| Check | 4.3 a |
| Polyethylene sleeve | 2.3 b |
| #5 container | 2.2 b |
| DeepRoot® | 1.1 c |
| #15 container | 1.0 c |
| Species | |
|---|---|
| Liquidambar | 2.6 a |
| Ficus | 1.9 b |
| Least significant difference (P = 0.05) | 0.5 |
| Statistical effectsz | |
|---|---|
| Species (S) | * |
| Barrier (B) | *** |
| S × B | NS |
↵zNS, *, **, *** = not significant and significant at P ≤ 0.05, 0.01, and 0.001, respectively. Means followed by the same letter are not significantly different.