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尾叶桉、湿地松１～６年生幼林施肥结果表明：１．尾叶桉在缺Ｐ的立地上，施Ｐ肥的效应极其显著。施Ｐ各处理在１～６年生时均显著或极显著地大于对照，其中以施ＮＰＫ全肥最好，６年生的树高、胸径和材积与对照比较，分别增长３５％，６９％，２４３％。而施ＮＫ肥的生长与对照差别不大。湿地松１～２年生的幼林施肥效果不大显著，３～６年生时才达显著差异，其中以施ＮＰＫ全肥的效果最好，６年生的树高、胸径和材积与对照比较仍分别增长１３％，１８％，５２％。２．尾叶桉、湿地松施Ｐ肥的各水平均达显著或极显著差异，施Ｎ、Ｋ肥的只在个别年度有差异。３．偏相关和复相关分析结果表明，尾叶桉施肥肥效主次顺序是Ｐ、Ｎ、Ｋ，湿地松是Ｐ、Ｋ、Ｎ。两树种均在５，６年生时，Ｎ、Ｐ、Ｋ的肥效最高。４．最优施肥配方：尾叶桉１～３年生以施Ｎ３Ｐ３为好，５～６年生以施Ｎ３Ｐ３Ｋ２为佳。湿地松１～２年生不用施肥，或薄施Ｎ肥；３～６年生以施Ｎ１Ｐ３Ｋ１较好。
Eucalyptus urophylla and Slash pine from 1 to 6 years old young forest showed that: 1. Eucalyptus urophylla in the absence of P site, the effect of P fertilizer is extremely significant. Compared with the control, all the treatments of applying P were significantly or very significantly greater than those of the control in the first to sixth year of life, and the tree height, DBH and volume of the six-year-old NPK fertilizers were the best, 35%, 69%, 243 %. The application of NK fertilizer growth and control little difference. The results showed that the fertilization effect of young pine plantations with one to two years of Pinus elliottii was not significant, and the difference was significant at three to six years. The effect of applying NPK whole fertilizer was the best. The tree height, diameter at breast height and volume at six years were still increased compared with the control 13%, 18%, 52%. 2. Eucalyptus urophylla and Pinus elliottii all reached significant or extremely significant differences, and N and K fertilizers differed only in individual years. 3. Partial correlation and complex correlation analysis showed that the order of fertilization of Eucalyptus urophylla was P, N, K, and P. sylvatica was P, K, N. When the two species were all on the 5th and 6th year, N, P and K had the highest fertilizer efficiency. 4. Optimum fertilization formula: Eucalyptus urophylla 1-3 years to apply N3P3 as well, 5 to 6 years to apply N3P3K2 better. Slash pine 1 to 2 years without fertilization, or thin application of N fertilizer; 3 to 6 years to apply N1P3K1 better.