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通过对不同播期条件下大豆开花结荚规律的调查，建立了大豆开花模式。结果表明，大豆开放小花数量累积频率的概率单位与开花日序呈对数函数关系，回归模型为：Ｙｐ＝Ａ＋Ｂ．Ｌｎｘ；确定了不同播种时期处理的，“有效花期”范围；分析表明“有效花期”较长，落花落荚率较小，产量较高。“有效花期”长短与结荚率及产量具有一定的相关关系；不同处理的产量差异达极显著水平。
Through the investigation on the law of flowering and podding under different sowing dates, the flowering pattern of soybean was established. The results showed that the probability unit of the number of open florets in soybean was logarithmically related to the flowering date. The regression model was Yp = A + B. Lnx. The range of “effective flowering” for different sowing dates was determined. The analysis showed that “effective flowering time” was longer, the rate of falling pods was lower and the yield was higher. There was a certain correlation between “effective flowering” length and pod yield and yield; the differences in yield of different treatments reached extremely significant level.