以中粳稻武育粳 3号和杂交中籼稻汕优 63为材料 ,采用不同密肥等栽培措施 ,形成成穗率不同的群体 ,研究水稻抽穗后源质量与产量关系 .水稻高产群体 ,抽穗期 LAI适宜 ,有效叶面积率高 ,高效叶面积率为 75%～ 80 % ,灌浆期光合势在 2 .1× 1 0 6m2 .d-1以上 ,势粒比 (光合势与总颖花量的比值 )在 4 7cm2 .d-1.粒 -1以上 .势粒比能反映抽穗后群体源库发展动态优劣 ,是经济产量形成期源库质量的较好表述 .在抽穗期适宜叶面积基础上 ,降低抽穗后叶面积下降速率 ,提高势粒比是进一步提高产量的有效途径 . With the medium japonica rice Wuyujing 3 and the medium indica hybrid rice Shanyou 63 as materials, different density fertilizers and other cultivation methods were used to form groups with different spike rates and to study the relationship between the yield and quality of the heading rice after heading. LAI is suitable, the effective leaf area ratio is high, the effective leaf area ratio is 75% -80%, and the photosynthetic potential at grain filling stage is above 2.1 × 106m 2 · d-1. Ratio) at 4 7cm2 .d-1. Above grain-1, the ratio of seed to grain reflects the development of source stocks in the population after heading, which is a better representation of the quality of source stocks during the period of economic yield formation. On the other hand, reducing the rate of decline of leaf area after heading and increasing the ratio of soil to grain is an effective way to further increase the yield.