以华北地区4个主栽玉米品种和4个杂交组合为试验材料。研究不同玉米基因型在3个密度下玉米产量及构成因子的变化规律。结果表明,在相同施肥量条件下,低密和中密度产量虽无显著差异,但其产量构成因子已发生显著变化,密度增加导致单株粒重、穗粒数、百粒重下降,空秆率上升。高密下产量显著下降15.5%。相关分析表明,空秆率是影响产量的最主要因素。 Four main maize varieties and four hybrid combinations in North China were used as experimental materials. The changes of maize yield and its composition under different densities were studied. The results showed that under the same fertilization condition, although the yield of low density and medium density had no significant difference, the yield components had a significant change. The increase of density led to the decrease of grain weight, number of grains per spike, Rate increased. High-density production dropped significantly by 15.5%. The correlation analysis shows that the empty straw rate is the most important factor affecting the yield.