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采用“４１６Ａ”最优混合设计安排尾叶桉幼林氮磷钾硼肥的施肥试验，建立了尾叶桉高生长与Ｎ、Ｐ、Ｋ、Ｂ肥施用量的回归模型，对模型进行仿真寻优，得到尾叶桉幼林最佳施肥配比的两套方案：高方案为Ｎ８０Ｐ４０Ｋ４０Ｂ２－５（ｋｇ／ｈｍ ２），当年目标树高生长４－５３ ｍ 。中方案为Ｎ３４－９Ｐ１７－４５ Ｋ１７－４５Ｂ１－１（ｋｇ／ｈｍ ２） 目标树高生长２－４５ｍ 。施Ｎ、Ｐ、Ｋ、Ｂ 肥过多或过少均不利于尾叶桉幼林的生长，三大要素中Ｋ 对尾叶桉幼林高生长影响最大，其次是Ｐ，最后是Ｎ。合理施肥能延长尾叶桉的树高生长速生期。采用监界值法诊断得到尾叶桉幼林叶片养分元素及其比值的临界浓度和最适浓度，这将为桉树的合理施肥，大面积推广提供科学依据
The optimum combination design of “416 A” was used to design the fertilization experiment of NPK fertilizers in the young Eucalyptus grandis × E. fortunei plantation. The regression model of high growth of Eucalyptus urophylla and the application rates of N, P, K and B fertilizers was established and the model was simulated Optimized to obtain the best fertilization Eucalyptus tenure ratio of two programs: high program N80P40K40B2-5 (kg / hm 2), the year the target height of 4-53 m. The program for the N34-9P17-45 K17-45B1-1 (kg / hm 2) target tree height growth of 2-45m. Applying too much or too little N, P, K and B fertilizer on the growth of young Eucalyptus urophylla forest was the most important factor, while K was the most influential factor on the height growth of young Eucalyptus urophylla, followed by P and finally N. Reasonable fertilization can prolong the height growth period of Eucalyptus urophylla. The critical concentration and optimum concentration of nutrients and their ratios of young leaves of Eucalyptus urophylla were obtained by the cut-off value method, which would provide a scientific basis for rational fertilization and large-scale popularization of Eucalyptus