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对５个密度处理的两个紧凑型新杂交种的群体结构做了系统研究，结果表明，品种间在各生育阶段的变化趋势一致。随着密度增加，群体干物质总量提高，叶片、茎鞘在干物质总量中的比例增加，果穗在干物质总量中的比例降低；叶片、茎鞘干重在植株中上部的分配增加，植株重心升高。另外，探讨了ＬＡＩ、ＬＡＤ、ＬＤＲ等生理指标和叶角度、叶向值、株高、穗位高等外部形态指标变化与玉米耐密性的关系，分析了产量分布及其随密度变异的原因，提出了紧凑型玉米高产栽培的合理群体指标。
The population structure of two compact new hybrids treated at five densities was systematically studied and the results showed that the trend of variation among breeds was the same at each growth stage. With the increase of density, the total amount of dry matter in the population increased, the proportion of leaves and stems and sheaths in the total dry matter increased, and the proportion of ear in the total dry matter decreased. The upper distribution of dry weight of leaves and stems increased in the plant , Plant center of gravity increased. In addition, the relationship between LAI, LAD, LDR and other physiological indexes and leaf angle, leaf value, plant height, ear height and other morphological indicators and the confidentiality of corn were discussed. The yield distribution and the reason of variation with density were analyzed. Put forward a reasonable population index of high-yielding compact corn.