【摘要】 研究了早熟18大豆品种不同播种密度对籽实产量及构成因素的影响。结果表明,播种密度与单株分枝数、单株荚数和单株籽实重呈极显著负相关(P<0.01),相关系数依次为-0.963 8,-0.970 6和-0.966 3,与茎数/m2、荚数/m2呈极显著正相关(P<0.01),相关系数依次为0.985 3和0.971 7。茎数/m2与荚数/m2呈极显著正相关(r=0.973 7,P<0.01),荚数/m2与单株籽重、单株荚数和单荚重均呈极显著负相关(P<0.01),相关系数依次为-0.9 6 7 6,-0.9 6 3 5和-0.9 4 6 2。播种密度(以株距表示)与茎数/m2补偿效应呈显著直线回归关系(P<0.05),与荚数/m2,籽实重/m2补偿效应均呈极显著三次抛物线回归关系(P<0.01)。单位面积籽实重随株距增加而变化的回归方程为:W=404.270 0-0.301 7h+4.706 1h2-1.965 1h3(r=0.850 3,P<0.05),以10株/m2(h=20 cm)的籽实产量最高,达427.3 g/m2,高于、低于此播种密度,单位面积籽实产量均下降。更多还原

【Abstract】 This experiment examined the effect of the sowing density of G.max on seeds yield and plant morphology.Results indicated that there was a significantly negative relationship between plant density(plants/m~2) and plant branching(r=-0.963 8,P<0.01),pods number(r=-0.970 6,P<0.01),and seeds weight((r=-0.966 34,P<0.01));as well as a significantly negative relationship between pods number and seeds weight(r=-0.967 6,P<0.01),pods per plant(r=-0.963 5,P<0.01),and pods weight(r=-0.946 2,P<0.01).A significantly positive relationship was found between both sowing density and stems number((r=0.985 3,P<0.01)) sowing density and pods number(r=0.971 7,P<0.01),with a significantly positive relationship also found to exist between stems number and pods number(r=0.973 7,P<0.01).The largest seeds yield recorded was 427.3 kg/m~2,achieved at a sowing density of 10 plants/m~2.Other plant attributes recorded at this sowing density include:branching of 7.64,pods number 84.46,and pods weight 0.689,with the seeds weight per pod ratio was 68.8%.The relationship between seeds yield and sowing density was best described by the parabola regression equation:W(g/m~2)=404.270 0-0.301 7 h+4.706 1 h~2-1.965 1 h~3(r=(0.850 3),P<0.05)更多还原