不同类型夏谷品种群体发育与干物质积累特点的研究

在大田条件下，以中秆大穗型品种鲁谷１０号和矮秆紧凑型品种矮８８为材料，研究了两种不同类型品种的群体结构特点，结果表明，不同品种的叶面积变化动态相似，叶面积系数随密度的加大而提高，且增加趋势逐渐减弱；密度加大削弱单株发育，产量构成因素有不同程度的降低；不同品种干物质积累特点不同，矮８８前期积累快，产量形成主要在灌浆期前；鲁谷１０号后期积累强度高，灌浆期是产量形成的主要时期，且随密度加大，生育后期对产量的形成贡献加大。

Canopy Development and Dry Matter Accumulation Characteristics of Different Types of Summer Millet Varieties

Middle height and large spike summer millet variety Lugu 10 and dwarf compact type Ai 88 were used to investigate canopy architectural characteristics of different variety types in experiment field The result showed that the changing trend of LAI was similar for different millet varieties at the growth period, which increased with the density raising and gradually became weaker. The development of single plant depressed with density increasing, the yield components lowed with different degrees. The characteristics of dry matter accumulation were different for two types of varieties The dry matter accumulation of Ai 88 was fast at early growth stage and its grain yield was formed mainly before grain-filling stage. Dry matter accumulation intensity of Lugu 10 was high at late growth stage and grain yield formed mainly at grain-filling stage, the contribution to grain yield at late stage was enlarged with density increasing.