种植密度对两种株型玉米产量及籽粒品质的影响

Effect of plant density on the yield and grain quality of different plant types of maize

以丰禾1(平展型)和郑单958(紧凑型)为试验材料,研究不同种植密度处理对两种株型玉米产量形成及籽粒品质的影响。结果表明,中密度处理下(丰禾1为5万株·hm-2、郑单958为6万株·hm-2),产量最高(丰禾1为9 896 kg·hm-2、郑单958为10 867 kg·hm-2)。随着密度增加,丰禾1籽粒粗蛋白含量、籽粒粗脂肪含量呈下降趋势,籽粒总淀粉含量呈上升趋势,相关分析表明,密度与籽粒粗蛋白含量、籽粒粗脂肪含量达极显著负相关;与总淀粉含量达显著正相关。随着密度增加,郑单958籽粒粗蛋白含量呈下降趋势,籽粒粗脂肪含量变化与之相反,籽粒总淀粉含量呈先减小后增大趋势,密度与籽粒总淀粉含量呈正相关。

Two different plant type corn varieties, the Fenghel （flat type） and Zhengdan958 （compact type）, were chosen to study yields and the characteristics of grain nutritional quality under different planting densities. The results showed that the 50 000 plants. hm2 of Fenghel and 60 000 plants . hm-2 of Zhengdan958 reaching the highest yield, which were 9 896 and 10 867 kg . hm2, respectively. The contents of grain crude protein and ether extract of Fenghel decreased with the increasing of plant density, the total starch contents changed conversely. The remarkable negative correlation was shown between the contents of grain protein and ether extract with planting densities, while exposing a remarkable negative correlation of total starch contents and planting densities. The grain protein contents of Zhengdan958 decreased with the plant density increasing, while the ether extract contents increased. The trend of the total starch contents decreased firstly and then increased with the plant density increasing, and a positive correlation appeared between the planting densities and total starch contents.