【摘要】 采用二因素四水平饱和Ｄ－最优设计，进行杜仲幼树氮磷配合施用研究，试验布设吸取了拉丁方排列的特点，共获得八组高径肥料效应曲面方程。方程分析表明，磷素对杜仲生长影响大于氮素，氮磷交互效应明显；文中进一步根据肥料价格，用等产线方程与最佳配比线方程计算得到一定产量下的最佳施肥量与最佳配比。更多还原

【Abstract】 The fertilization effects by using nitrogen mixed with phosphorus on Eucommia ulmoides young trees have been tested,and 8 paie response equations of height and diameter were obtainned by using saturation D-optimum design of 2 factors 4 levels while taking the speciality of Latin square design. The analysis of equations show that phosphorus is more significant than nitrogen for growth of Eucommtia ulmoides, the function is better under application of nitrogen in combination with phosphorus. And the optimum amounts and the optimum ratio of fertilizer in definition increment were gaven in the paper by calculation of response equation and iso-increment line equation.更多还原