为明确玉米品种商单1967在豫东地区适宜的种植密度,以及种植密度对其倒伏和机收质量的影响,试验设置6.0万株/hm²（D₁）、7.5万株/hm²（D₂）和9.0万株/hm²（D₃）3个种植密度,分析种植密度对商单1967产量、倒伏和机收质量指标的影响。结果表明,随着种植密度的增加,商单1967的产量呈先增加后降低趋势,从6.0万株/hm²密度增加到7.5、9.0万株/hm²时,其产量增幅分别为12.4%和9.7%;茎折率和总倒伏率随密度增加而增加;机收质量指标破碎率、杂质率和总损失率随种植密度增加均呈增加趋势。通过倒伏率与机收质量指标的相关性分析得出,总倒伏率与破碎率呈正相关（P<0.01）,与总损失率呈正相关（P<0.05）,与杂质率间相关性无统计学意义（P>0.05）。综合考虑产量、倒伏和机收质量方面因素,商单1967在豫东地区适宜的种植密度为7.5万株/hm²。

In order to clarify the suitable planting density of corn variety Shangdan 1967 in the eastern Henan Province, as well as the impact of planting density on lodging and mechanical harvesting quality, 3 planting densities of 60 000 plants/hm²（D₁）, 75 000 plants/hm²（D₂）, and 90 000 plants/hm²（D₃）were set up in the experiment, the effects of planting density on the yield, lodging, and mechanical harvesting quality indicators of Shangdan 1967 were analyzed. The results showed that with the increase of planting density, the yield of Shangdan 1967 showed a trend of first increasing and then decreasing. When the density increased from 60 000 plants/hm² to 75 000 and 90 000 plants/hm², the yield growth rates were 12.4% and 9.7%, respectively. The stem bending rate and total lodging rate increase with the increased of density. The crushing rate, impurity rate, and total loss rate of mechanical harvesting quality indicators all showed an increasing trend with the increase of planting density. Through the correlation analysis between lodging rate and mechanical harvesting quality indicators, it was found that there was a positive correlation between total lodging rate and crushing rate（P<0.01）, a positive correlation with total loss rate（P<0.05）, and no statistically significant correlation between total lodging rate and impurity rate（P>0.05）. Taking into account factors such as yield, lodging, and mechanical harvesting quality, the suitable planting density for Shangdan 1967 in the eastern Henan region was 75 000 plants per hectare.