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水稻亚种间杂交组合的单位叶面积有效生产量随着单位叶面积负荷量的增力。而提高，表明其产量库容具有主动调节叶片光合生产的能力，较大的叶面积负载具有强源畅流作用。但如库容过大，而“源”不能供给所有籽粒灌浆的物质时，籽粒充实度差。亚种杂一代孕穗期贮藏的光合产物向穗部转运的量，比汕优６３低，此期如适当限源控库，组成合理的苗株穗粒结构．可改善贮藏物质向籽粒的转运，亚种间杂种一代属“源限制型”，“开源畅流”是提高其籽粒充实度的途径之一。
The effective production of unit leaf area of rice subspecies hybrid combinations increased with the unit leaf area load. The results showed that the yield and storage capacity had the ability to actively regulate photosynthetic production of leaves, and the larger leaf area load had strong source and smooth flow. However, if the storage capacity is too large, and the “source” can not provide all the grain filling material, the grain filling degree is poor. Subspecies generation of booting photosynthetic products stored in the ear translocation of the amount of less than Shanyou 63, this period as appropriate source control library to form a reasonable seedling spike grain structure. Which can improve the transport of stored matter to grain. One generation of subspecies hybrids is “source restricted” and “open source and smooth flow” are one of the ways to improve their grain filling degree.