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滨海沙地湿地松中龄林施肥可以明显促进林木胸高断面积的生长。试验结果表明：对１０年生湿地松林分追施Ｎ、Ｐ、Ｋ组合肥，施肥后４年施肥效应十分明显，其中犁壁沟试验林Ｎ１Ｐ３Ｋ处理可使林木平均单株胸高断面积增加１４．９４７０×１０－４ｍ２，主伐时每公顷增加净现值２８４．２９元，施肥投入的内部收益率达１９．１３％；青苔沟间伐试验林Ｎ１Ｐ１Ｋ处理可使林木平均单株胸高断面积增力。１９．９２２０×１０－４ｍ２，主伐时每公顷增加净现值５３８．６７元，施肥投入的内部收益率达２３．３９％。
The fertilization of middle-aged stands of Pinus elliottii in coastal sandy land can obviously promote the growth of the area with high breast-height in the forest. The results showed that applying N, P and K compound fertilizers to the 10-year-old Pinus elliottii forest fertilization had a significant effect of fertilization four years after fertilization. The N1P3K treatment in the experimental plots in the Piligou Gully increased the mean chest-height area of the forest trees by 14.9470 × 10-4m2. The net present value of hectare per hectare increased by 284.29 Yuan and the internal rate of return for fertilization reached 19.13%. The N1P1K treatment of mulberry grove thinning test could increase the average chest-height area of forest. 19.9220 × 10-4m2, increase the net present value of 538.67 yuan per hectare during the main cutting, and the internal rate of return of fertilizer input reached 23.39%.