沈糯6号的籽粒产量及相关生理指标研究

Studies on Grain Yield and Related Physiology Indexes of Waxy Corn Shennuo No.6

以郑单958为对照,在5个密度下对沈糯6号进行籽粒产量、冠层结构和生理指标的比较研究。结果表明：在75 000株/hm^2密度下沈糯6号的籽粒产量可达7 122.5 kg/hm^2,与郑单958的最高产量差异不显著;相同密度下沈糯6号的生物产量、叶面积指数较低,但在较高密度下收获指数和灌浆后期最大叶面积指数持续时间大于郑单958;叶绿素含量与郑单958没有明显差异;5个密度下光合速率均高于郑单958,并受密度压力的影响明显小于郑单958;在67 500~82 500株/hm^2高密度下,沈糯6号灌浆期穗位下部冠层透光率比郑单958要高,良好的通透性可能是光合速率和叶面积指数优于郑单958的主要原因。

With Zhengdan958 as control to study the grain yield,canopy structure and physiology indexes of waxy corn Shennuo No.6 under five planting densities.The results showed that the grain yield of Shennuo No.6 could reach to 7122.5kg/hm^2 at 75000 plants/hm^2,and had insignificant differences in contrast to the highest yield of control.The biomass and the LAI of Shennuo No.6 were lower than that of control in the same density,the harvest index was higher than that of control at the high densities,and duration of the maximum LAI was relatively longer than that of control at the high densities.There were no differences of the chlorophyll content compared with control.Waxy corn Shennuo No.6 has higher photosynthetic rate and less influence of density under the five densities;The canopy transmittance below the ear was higher than that of control during grain-filling stage at 67500 to 82500 plants/hm^2.Good permeability might be the main reason of photosynthetic rate and LAI higher than control.