The 2-year effect (February 1994 to February 1996) of 3 stem supports on height, diameter, and stem taper of Pyrus calleryana.
| Treatment | Height increase (cm) | Top diameter increase (cm) | Center diameter increase (cm) | Bottom diameter increase (cm) | Trunk taper (mm/cm) | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Support | Nonsupport | Support | Nonsupport | Support | Nonsupport | Support | Nonsupport | Support | Nonsupport | |
| Double-stake | 82.3 a* | 24.4 a | 2.44 a | 1.73 a | 2.08 a | 2.06 a | 2.26 b | 2.36 a | 0.092 b | 0.146 ab |
| Bio-Tie | 79.3 ab | 15.2 a | 2.44 a | 1.54 a | 2.38 a | 1.68 a | 2.87 a | 2.00 a | 0.137 a | 0.177 a |
| Tree Saver | 61.0 b | 12.2 a | 1.54 a | 1.19 a | 1.75 a | 1.35 a | 2.44 b | 1.62 a | 0.091 b | 0.129 b |
↵* Means in the same column followed by a different letter are significantly different at α ≤ .05 using the Scheffe multiple comparison procedure.