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对亚种间杂交稻、品种间杂交稻和常规稻不同类型的水稻组合（品种）的干物质生产和光合特性及其籽粒充实度进行了比较研究。结果表明，在水稻生长发育前期，亚种间杂交稻比品种间杂交稻和常规稻具有更强的干物质生产优势，但生长发育后期干物质生产能力较差，群体净同化率和群体生长率较低，干物质分配不协调，库容量大，早衰，导致亚种间杂交稻的籽粒充实度差。并根据研究结果对如何提高籽粒充实度进行了探讨。
The dry matter production, photosynthetic characteristics and grain filling degree of different types of rice combinations (varieties) between inter-subspecies hybrid rice, inter-breed hybrid rice and conventional rice were compared. The results showed that hybrid rice had more advantages of dry matter production than hybrid rice and conventional rice at the early stage of rice growth and development, but the dry matter production ability was poor at the late growth stage, and the population net assimilation rate and population growth rate Low, uncoordinated dry matter distribution, large pool capacity, premature aging, leading to poor seed filling of inter-subspecific hybrid rice. According to the results of the study, how to improve grain filling degree was discussed.