The results indicated that plant height, leaf age, LAI and accumulation of dried matter existed difference under different sowing density, especially sowing densities had the great effects on yield.
结果表明，不同种植密度下株高、叶龄、LAI和干物质积累均存在差异，且产量受种植密度影响较大。
The suitable planting density and time of sowing are favor of optimum use of soil water and improving water use efficiency, and make potato increasing its output.
适宜播种密度和播期有利于土壤水分的优化利用和水分利用效率的提高，可促进旱地马铃薯增产。
And death rate of tiller and leaves existed difference in the year and next year, which increased as density of sowing increasing.
单株分蘖死亡率及单株叶片死亡率在播种当年及第二年存在差异，随密度增加而增加，但在播种第三年差异消失。
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