Agronomic Characteristics and Yield of Density-tolerant Spring Maize Cultivars in Different Planting Densities and Row Spacing

The plot experiment with three factors split was conducted with three maize varieties,three kinds of planting densities and row spacing.The difference of agronomic traits and yield under different experimental conditions were analyzed.The results showed that plant height,height of ear position,stem diameter,maximum leaf area index were significantly influenced by planting density,and the three components of maize yield had significant difference at different planting density and mode,interaction among agronomic traits influenced the maize yield.The yield of Qiangsheng51 and Dafeng26 both were the highest at a density of 82 500 plants per ha in wide-narrow row(66.6+33.3 cm) planting mode,Dafeng26 had the higher yield that more than 15 000 kg/ha at the density of 82 500 plants per ha in equal row(50+50 cm) planting mode.The three combinations were the optimal allocation of super high yield maize on the experimental conditions.