种植密度影响到玉米群体内小气候，进而影响玉米的生长发育。在自交系选育过程中，通过提高种植密度增加个体间竞争压力，可以提高自交系的选择效果。

The density of planting can influence the microclimate of maize group and their growth further. In the course of selecting maize inbred lines, increasing the density of cultivation can enhance the competition between individuals, thus, the result of selecting can be advanced.

北京农业育种基础研究创新平台“超级玉米种质创新及中国玉米标准DAN指纹库构建”项目(YZPT02-06)