中文摘要：

根据稻穗日开花概率和结实率的动态变化规律，结合稻田逐日始花穗的数量及其平均穗粒数和结实率等特征，提出了稻田逐日开花量和结实率的估算方法。并以华粳1号为试验材料，观察了其稻穗逐日开花量百分率及稻田逐日始花穗的数量、平均颖花数和结实率，估算了水稻花后逐日开花量及结实率。结果表明：华粳1号稻田日开花百分率呈左偏态分布，开花高峰期出现在始花后的4-9d，日均开花量占总颖花的10％左右；而颖花结实率在开花后呈衰减变化。

英文摘要：

According to the flowering habit of rice panicle and daily panicle number of first flowering and its average grain number and seed-setting, a method for calculating daily flowering amount and its seed-setting of rice was proposed. Huajing 1 as experimental material, the flowering habit of its panicle and daily panicle number of first flowering and its aver- age grain number and seed-setting were observed, and the daily flowering amount and seed-setting was estimated. The re- suits showed the daily flowering number of Huajing 1 was expressed in positively skewed distribution, and the peak period appeared at 4 - 9 d after the starting flower and the daily flowering amount was up to 10%. The seed-setting of florets declined with the days generally.