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通过密肥试验，研究水稻生育中期群体叶面积组成与光合生产的关系． 结果表明：高光效群体，高峰苗期的总茎蘖数相当于适宜穗数的１ ．２ ～１ ．３ 倍，拔节期有效分蘖叶面积率为９０ ％ ９３ ％ ，拔节至抽穗期茎蘖下降速率小，抽穗期在适宜叶面积下，有效和高效叶面积率分别为９０ ％ ９５ ％ 和７５％ ８０％ ，叶片的叶绿素含量和含氮率高，叶片的平均净光合大，抽穗后叶面积衰退慢，抽穗至成熟期的光合势和净同化率大，籽粒产量高．
Through the fattening experiment, the relationship between the leaf area composition and photosynthetic production of mid-term paddy population was studied. The results showed that the total number of tillers in high light efficiency population and peak seedling stage was equivalent to 1. 2 ~ 1. The effective tillering leaf area ratio at jointing stage was 90% 93%, and the decreasing rate of stem tiller at jointing stage to heading stage was small. The effective and efficient leaf area ratio at heading stage was 90%, 95% and 75% respectively %, Leaf chlorophyll content and nitrogen content were high, the average net photosynthesis of leaves, leaf area decay slow after heading, photosynthetic potential and net assimilation rate from heading to maturity, the grain yield is high.