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采用三因素五水平最优回归设计，研究了贵州黔东南硅铝质红壤氮磷钾组合对杉木苗的生长效应。结果表明，氨磷钾肥对杉木苗生长均为正效应，对苗高、产量为N＞P＞K，对地径为K＞P＞N，配施效果优于单施。高产优质杉木苗的最优施肥配方为每公顷N120～180kg，P2O582．5～165kg，K2O135～202．5kg，可获得杉木苗产量100～125株／m2其中Ⅰ、Ⅱ级苗达80％以上。
The optimal three-factor and five-level regression design was used to study the effects of NPK combination on the growth of Chinese fir seedlings. The results showed that the phosphorus, potassium and potassium fertilizer had a positive effect on the growth of Chinese fir seedlings. The seedling height and yield were N> P> K and K> P> N, respectively. The optimum fertilization formula for high yield and quality Chinese fir seedlings is N120 ~ 180kg per hectare, P2O582.5 ~ 165kg and K2O135 ~ 202.5kg, and the yield of Chinese fir seedlings is 100 ~ 125 plants / m2.