Trunk diameter, tree height, and circling root weight of live oak after 2 years growing in six different nursery production methods.
| Production method | Trunk diameter (cm) | Tree height (m) | Circlingz root weight (g) |
|---|---|---|---|
| Plastic container | 5.8 by | 3.7 aby | 11.3 b |
| Plastic container with SpinOut | 6.1 ab | 3.7 a | 8.9 ab |
| Air root-pruning (ARP) container | 6.3 a | 3.7 a | 6.1 ab |
| Low-profile ARP container | 6.3 a | 3.9a | 2.8 a |
| Root-pruned, field-grown, B&B | 5.8 b | 3.5 b | N/Ax |
| Non-root-pruned, field-grown, B&B | 6.3 a | 3.7 ab | N/A |
↵z Circling root weight was the total root weight of all roots > 2 mm (0.08 in.) diameter visible on the outside surface of the root ball averaged from five trees per production method.
↵y Means in a column followed by the same letter were not different at P < 0.01. Twenty-eight trees from each production method were mea sured for trunk diameter and tree height.
↵x Field-grown B&B trees had no circling root weight on the outside edge of the root ball.