陕单8806玉米品种适宜群体与源库性状指标研究

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。

Study of Suitable Groups and Source-sink Properties Index on Maize of Shandan8806

By the fact that two places, nine densities experiments dates to maize Shadan8806 for 2 years were analyzed. It was found that proper density of Shandan8806 summer seeding high yield was 67 500 - 75 000 plants/ha. Group source-sink ratio was enhanced with the density increasing. When source-sink ratio greater than 1.5 (75 000 plants/ha), source deliverability began to come down, yield was notable fall off. The leaf area index of silking stage kept about 5.1, transmitting rate of tier were proper within the group respectively, the situation was good by brightness, crop output is maximal. Groups of light and potential of earlier stage increasing by the density were increasing. While density was too big, groups of light and potential of after spinning 25 d came down. Therefore, rational close planting, foundation ensuring that the proper group leaf area modulus and fine accepting glorify a situation, maintaining warehouse source properties balance going ahead in higher level was to gain high yield.