The Effect Of Different Density On The Plant Type, Group Structure And Yield Character Of Jimi Soybean 1

This paper taking Jimi Soybean 1 Number as research material, studies change regular of the plant type and yield forming factors,and community ecological factor in different density conditions, analyzes the relation of the community structure of low stalk limited branching close planting soybean and the community ecological factor, and the influence of that on the yield forming and distribution, explores the super-high yield plant type of low stalk close planting limited branching soybean and the community physiology ecology character. All these have important significance of the utilization of reasonable cultivating method and the effective selection of super-high yield breeding index.1. On the basis of density affecting plant type is not only distribution change of leaf surface area index but also the rising and falling change. As the density increasing, the time of leaf surface area index achieving the biggest is earlier than ever, which trends to the top distribution, and make the amount of lengthening node increase, the position of node fall, the plant length raise, the diameter of plant stem thin, the amount of branch decrease, the distribution of pod trend to the top. The distribution change of leaf surface area index is also the guiding factor of CO2 distribution in community and translucent rate change.2. The effect of density on hundred grains weight and pod grains amount is smaller, and density affect per surface area yield mainly by affecting per plant pod numbers. As the density increasing, the per plant pod amount decreased. As the extent of density decreasing and the extent of per plant pod amount increasing are different, their product is also the course of from small to large and later from large to small, and make the per surface yield first increase and later decrease.3. The biggest leaf area surface index appears the 75- 90th days after seedling emergence. The ratio of upper leaf area surface index and that of middle is 1.2. When the leaf area surface index of surpassing 4 maintain super 40 days, can gain higher yield.4. Some relative analysis indicates that the correlation of per area yield, density and every character shows different followed density change, and which are just right opposite when lower than the suit density and higher than the suit density.