2011 — 2012年，在秦王川地区研究了不同种植密度(650万、750万、820万、900万株/hm2)对小麦品种永良15号的产量及其构成因素的影响。结果表明，密度对该品种产量影响显著，产量随种植密度呈二次抛物线变化趋势，即随着密度的增大产量增加。密度为820万株/hm2时产量达到最大值，2011、2012年分别为6 750.00、6 683.33 kg/hm2，且综合性状表现优良；之后随着种植密度的增加产量随之降低。密度对穗数和穗粒数的影响达到显著水平，但对千粒重的影响不显著。

A field experiment was conducted to investigate the effects of four plant densities(6.5 million， 7.5 million， 8.2 million， 9.0 million/hm2) on yield and its relative components from March， 2011 to August 2012 . The results showed that plant density had significant effects on grain yield of wheat . Relationship between wheat yield and plant density exhibited a parabolic curve， namely， grain yield of wheat increased as the plant density increased， reached the maximum yield was respectively 6 750.00， 6 683.33 kg/hm2 at the density of 820 million plants/hm2， indicated its synthesis character performance was super . and then declined when the density continue to increase . Plant density had significant effects on grain number per area and kernel numbers per spike， while had no significant effects on 1 000-grain weight .

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