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连续４年对幼龄兰考泡桐胶合板材林进行营养补给效应研究的结果表明：造林后前二年营养补给对泡桐生长无明显促进效应，第三年采用Ｎ１００Ｐ２５Ａ３０进行营养补给，对泡桐胸径、胸高断面积和材积生长具有显著的促进效应，分别提高６．１０％，１２．７２％，１３．３４％，而对高生长无显著效应．其效应主因子为磷肥，次因子依次为氮磷交互、深度和氮肥，最佳营养补给组合为Ｎ１００Ｐ２５Ａ４０采用Ｎ１００Ｐ２５Ａ３０进行营养补给，具有显著的经济效益，其内部收益率可达１５．４６％．
The result of nutrient replenishment study on young P. koraiensis plywood plots for 4 years showed that there was no significant effect of nutrient replenishment on the growth of S. paulownia in the first two years after afforestation. In the third year, N125P25A30 was used for nutrient replenishment. The DBH, Area and volume growth have a significant promotion effect, respectively, increased 6.10%, 12.72%, 13.34%, while no significant effect on the growth. The main factor of the effect is phosphate fertilizer, followed by nitrogen and phosphorus interaction, depth and nitrogen fertilizer. The best nutrition supplement combination is N100P25A40. N100P25A30 is used for nutrient replenishment, which has significant economic benefits and an internal rate of return of 15.46%.