Effect of planting depth into 11 L and 57 L nursery containers on root circling 68 months after planting 170 L containers into landscape soil.
| Depth into 11, 57, and 170 L nursery containerz (mm) | Percent trunk circumference with tangent or circling roots (>10 mm diameter) touching trunky (%) | Root circling rating over root collarx (1 to 5) |
|---|---|---|
| 13/ 0/ 0 | 2 bw | 2.6 b |
| 13/ 64/ 0 | 8 b | 4.2 a |
| 64/ 0/ 0 | 8 b | 3.9 ab |
| 64/ 64/ 0 | 22 a | 4.8 a |
↵z Point where the topmost root emerged from trunk planted at indicated distance below substrate surface into three container sizes; 20 cm tall liners in square propagation containers originally planted into 11 L nursery containers.
↵y Percent of trunk circumference with roots >10 mm diameter growing tangent to or circling trunk that touched or were embedded into trunk bark.
↵x 1 = no roots to 5 = many roots crossing over root collar and main lateral roots.
↵w Numbers followed by a different letter within columns are statistically different at P < 0.03; n = 12, averaged across landscape planting depth and root pruning due to insignificant interactions (P > 0.13 and > 0.45, respectively) with depth in the nursery container.