通过采用高密度 75 0 0 0、90 0 0 0和 10 5 0 0 0株 /hm2 栽培 ,分析了种植密度对紧凑型玉米掖单 2 2、登海1号和半紧凑型玉米Sc70 4果穗性状的影响。结果表明 ,半紧凑型玉米果穗性状的耐密性要优于紧凑型玉米。产量因素中粒重密度的影响较小 ,高密度主要影响玉米的结穗性、有效穗长和结实粒数。随着密度的增加 ,穗粒数对产量的贡献逐渐增大 ,粒重的贡献相对变小 By using high density of 75 0 0 0, 90 0 0 0 and 105 0 0 0 plants / hm2 cultivation, the effects of planting density on the ear characters of compact corn, Yedan22, Denghai 1 and semi-compact corn Sc704 Impact. The results showed that the confidentiality of ear characters of semi-compact corn was better than that of compact corn. The effect of grain weight density was less in the yield factors. The high density mainly affected the spike, effective spike length and grain number of maize. With the increase of density, the contribution of grain number per spike to yield gradually increased, while the contribution of grain weight decreased