以陇薯8号为试验材料，研究氮磷肥及密度对超高淀粉马铃薯品种干物质含量的影响。利用二次通用旋转设计原理建立了氮肥（X1）、磷肥（X2）和栽培密度（X2）与陇薯8号干物质含量（Y）的回归方程：y=32．09642—0．88509X1^2-1．21213X2^2—1．40128X3^2。分析结果表明，三因子对干物质含量（y）影响的大小顺序为磷肥〉栽培密度〉氮肥；单因素效应表明都是在0水平时干物质含量达到最大值；三个因子中任意两个因子的互作效应都是在-1．682～0水平时，干物质含量随着二因子水平的增加而提高，二者有明显的促进作用，0水平之后。干物质含量则随着二因子水平的增加而下降；三因子作用下干物质含量大于29．7％的栽培方案为：纯N113．20—186．86kg，hm2，P2O3 109．30—160．68kg／hm2，栽培密度为48219—56781株／hm2。%The test took cv. Long shu 8 as the testing material to study the effects of the application of nitrogen and phosphorus fertilizer and planting density on the dry matter content of super-high starch potato cultivars. A mathematic model for the application of nitrogen （X1）, phosphorus （X2）, planting density （X3） and the dry matter content of Longshu 8 （I1） was built by the quadratic general rotational combination design. The result showed that the influencing order of the three factors on the dry matter content was phosphorus 〉 planting density 〉 nitrogen. The univariate effects analysis showed that the dry matter content reached the maximum at 0 level of each factor. The interaction effects showed that at the level of -1.682 - 0, the dry matter content increased with the increase of any two factors, but beyond the level of 0, the dry matter content decreased with the increase of two factors. The fertilizing plan for the dry matter content being 29.7% or more as following： pure N was 113.20 - 186.86 kg / ha, P2O3 was 109.30 - 160.68 kg / ha and planting density was 48 219 - 56 781 plants / ha.
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