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对杂交水稻常规水稻在结实期间剑叶和谷粒中的蔗糖含量的变化，穗上不同部位的结实情况，实粒率和千粒重的动态变化以及它们之间的关系，结实率对有机营养供应变化的反应等方面进行了比较研究。结果表明，杂交水稻结实率较低主要是由于穗的中、下部尤其是稳下部出现较多的秕粒造成的；与常规水稻比较，杂交水稻在灌浆的前中期，剑叶和籽粒中的蔗糖含量高，籽粒增重快，后期则相反；穗上部和下部的结实率和千粒重皆差异大；在实粒增加过程中，千粒重与常规水稻相同时，实粒率低，在灌浆后期，实粒率对有机营养应给的变化较敏感，早、晚季及“库”“源”关系变化时，结实率和千粒重的变化幅度大。本文还对杂交水稻结实率较低和较不稳定的原因进行了探讨。
The change of sucrose content in flag leaf and grain, the seed setting in different parts of panicles, the dynamic change of grain-seed ratio and 1000-grain weight of conventional rice during the grain filling stage of conventional rice and the relationship between seed setting rate and organic nutrient supply The reaction and other aspects of a comparative study. The results showed that the lower seed setting rate of hybrid rice was mainly caused by more grains in the middle and lower parts of the panicles, especially in the lower part of the panicles. Compared with the conventional rice, the contents of sucrose High grain weight, rapid grain weight gain, and the opposite in the late stage. The seed setting rate and 1000-grain weight were different between the upper and lower parts of the panicle. In the grain filling process, the grain yield was lower when the grain weight was the same as that of the conventional rice. Rate of organic nutrition should be given more sensitive to change, early and late seasons and “library” and “source” relationship changes, the seed setting rate and grain weight change range. The paper also discussed the reason of low and unstable seed setting rate of hybrid rice.