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通过对陕单8806玉米品种9个密度的试验结果表明,陕单8806夏播高产适宜密度为67 500～75 000株/hm2。群体库源比值随着密度的增加而增大,当库源比值大于1.5时(75 000株/hm2),源供应能力开始下降,产量显著减少。吐丝期叶面积系数保持在5.1左右时,群体内各层透光率适宜,受光态势良好,产量最高。随着密度的增加,前期的群体光合势增加,当密度过大时,吐丝25 d后的群体光合势下降。因此,合理密植、保证适宜的群体叶面积系数和良好的受光态势、维持库源性状在更高水平上的平衡是获得高产的根本。
The results of nine density experiments on Shaandan 8806 maize showed that the suitable density for Shadai 8806 summer sowing was 67 500 ~ 75 000 plants / ha. The population source ratio increased with the increase of density. When the ratio of source to source was more than 1.5 (75 000 plants / hm2), the source supply capacity began to decline and the yield decreased significantly. When the leaf area coefficient of silking stage was maintained at about 5.1, the light transmittance of each layer in the community was suitable, and the light receiving situation was good and the yield was the highest. With the increase of density, the photosynthetic potential of the early population increased, and when the density was too large, the photosynthetic potential of the population declined after 25 days of silking. Therefore, it is the key to achieve high yield by reasonably close planting, ensuring suitable leaf area index and good light receiving situation, and maintaining a higher level of the balance between sink-source traits.