为了确定玉米新品种‘郑单988’的适宜种植密度，对不同种植密度下‘郑单988’的植株性状以及产量等进行了分析对比，通过不同种植密度对‘郑单988’生长发育及产量影响的研究，结果表明：‘郑单988’单株叶面积和单株干物质积累量随密度增大而减小，群体叶面积系数和干物质积累量随密度增大而增加，达到一定种植密度后而下降，产量随密度加大先增后减，‘郑单988’的适宜种植密度为6.0万株/hm2~6.75万株/hm2。

In order to find the most suitable density of new corn variety ‘Zhengdan988’, a filed experiment was designed with 8 kinds of densities, and the traits of plant and grain yield and its components were analyzed .The influence of densities on growth and yield of ‘Zhengdan988’ was studied. Leaf area per plant and dry matter accumulation per plant were dropped by densities increasing. The results showed that: leaf area index and dry matter accumulation were increased by densities increasing and dropped by high densities. The yield was increased first and then decreased by densities increasing. The results showed that the suitable planting density of ‘Zhengdan988’ was 6.0×104-6.75×104 /hm2.