Fertilizer ratio^{y} | Increase in trunk diameter^{x} (cm) |
---|---|

2–1–1 | 4.83 a^{w} |

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/m

^{2}/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 (P_{2}O_{5}):potassium (K_{2}O).↵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.