Live oakz trunk diameter increase in the first 27 months after transplanting.
| Fertilizer ratioy | Increase in trunk diameterx (cm) |
|---|---|
| 2–1–1 | 4.83 aw |
| 2–0–1 | 4.75 a |
| 2–0–0 | 4.62 a |
| 2–1–0 | 4.57 ab |
| Nonfertilized | 4.17 b |
↵z Average trunk diameter was 23 cm (9 in.)
↵y Fertilizer was applied at a rate of 19.5 g N/m2/yr (4 lb N/1,000 fF/yr) to a 3 × 3 m (10 × 10 ft) square area around the trunk beginning 9 months after transplanting. Fertilizer ratio is nitrogen:phosphorus (P2O5):potassium (K2O).
↵x Trunk diameter was measured at 30 cm (12 in.) above soil surface.
↵w Means followed by different letters are significantly different at P < 0.03. Each number is the mean of 32 trees.