1. 方法］定株调查每株美国无架豇豆的豆英数、英重、英长、花序数，拉秧时测定主茎高、分枝数及主茎节数，并计算单株产量，进行单株产量构成因素的相关分析和通径分析。
The cowpea number per pod, weight per pod, length per pod, number of inflorescence; and the height of main stem, number of branches and node of main stem at seedling-pulling at each single plant were investigated for the yield-calculating, and meanwhile, the analysis of relevant factor and path analysis of the component of yield/plant was conducted.