粳稻籽粒充实物质主要来自 3张冠层叶 ,分析抽穗后冠层叶中的干物质生产、积累等特性 ,对水稻栽培措施的改进有一定的指导作用。1　材料与方法试验于 1 997～ 1 998年在东台市农科所试验田进行 ,土质为粉粒砂壤土 ,土壤全氮 0 .1 7%,全磷 0 .2 93%,全钾 2 .1 2 %,速效磷 64.5mg The grain filling material of japonica rice mainly came from three canopy leaves. The analysis of dry matter production and accumulation in canopy leaves after heading showed some guidance to the improvement of rice cultivation measures. 1 Materials and methods The experiment was conducted in the experimental farm of Dongtai Agricultural Science Institute from 1997 to 1998. The soil was silty loam soil with 0.17% of total nitrogen, 0.233% of total phosphorus and 2.21% of total potassium 2%, available phosphorus 64.5mg