不同密度下有限分枝型矮秆耐密大豆产量因素变化规律

目的]研究不同密度条件下有限分枝型矮秆耐密大豆产量因素的变化。方法]以吉密豆1号为材料，设置8个密度处理（15万、23万、31万、36万、39万、42万、47万、557万株／hm^2），研究不同处理大豆的干物质积累、经济系数、荚粒的纵向分布情况。结果]吉密豆1号产量与密度的关系符合方程Y=-2.697X^2＋208.884X＋1130.584，密度为31万-42万株／hm^2时可获得较高的产量，密度为3977万株／hm^2时，产量最高，经济系数为0.261；随着密度的增加，单株产量、单株荚数、单株粒数、分枝数和分枝结荚数均呈下降趋势。且中、下层荚数显著减少，而主茎荚数无明显变化；荚粒数、百粒重和密度无明显相关性。结论]随密度增加，吉密豆1号以上层结英为主，主茎与分枝结荚兼顾。

Changing Low of Limited Branching Type, Dwarf and Dense-resistant soybean under Different Densities

Objective] The aim was to study the change of yield components of limited branching type,dwarf and dens-resistant soybean under different densities.Method] With Jimi soybean No.1 as the material,8 densities(15×104,23×104,31×104,36×104,39×104,42×104,47,55 ×104 plant/hm2) were designed to study dry matter accumulation,economic index,longitudinal distribution of pod and seed in different treatments.Result] The relationship of yield and density of Jimi soybean No.1 fitted the function of Y=-2.697X2+208.884X+1 130.584.When the density was 31×104-42×104 plant/hm2,the yield of Jimi soybean was higher and when the density was 39 ×104 plant/hm2 its yield was the highest with economic index of 0.261.With the increase of density,yield per plant,pod per plant,grain per plant,branch number and pod number per branch all showed decreasing trend,and the pod number in middle and low layer significantly decreased,but the pod number of stem had no obvious change.The grain number per pod and 100-grain weight had no obvious correlation with density.Conclusion] With the increase of density,the pod setting of Jimi soybean was dominant by upper lay,pod setting by stem and branch was considered at the same time.