Effect of planting depth in the nursery container and root pruning at landscape planting on root growth 68 months later.
| Depth into 11, 57, and 170 L nursery containerz (mm) | Root pruningy | Total CSA roots >10 mm diameter growing up >20 degree angle outside 170 L container root ball (mm2) |
|---|---|---|
| 13/ 0/ 0 | None | 866 bx |
| Shaved | 706 b | |
| 13/ 64/ 0 | None | 847 b |
| Shaved | 738 b | |
| 64/ 0/ 0 | None | 696 b |
| Shaved | 909 b | |
| 64/ 64/ 0 | None | 525 b |
| Shaved | 1517 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 Root pruning removed (shaved) the outer 3 cm of the 170 L root ball periphery prior to planting into landscape soil.
↵x Numbers followed by a different letter within columns are statistically different at P < 0.05; n = 6, averaged over landscape planting depth due to insignificant interaction with landscape planting depth (P = 0.25).