引言不少研究证明小麦开花后的光合作用为籽粒提供绝大部分的干物质,其中旗叶的贡献最大。MohiuddiN等(1980)发现冬小麦旗叶和穗部绿色面积功能期与籽粒产量和粒重为正相关;与每穗粒数为负相关。DhimaN等(1980)也证明旗叶面积同籽粒产量有密切关系。小麦籽粒的产量与其充实度有关。我省多数地区年度间存在小麦籽粒充实不良、千粒重低 Introduction Many studies have shown that photosynthesis after flowering of wheat provides most of the dry matter for the grain, with the flag leaf contributing the most. MohiuddiN et al. (1980) found that the functional areas of flag leaf and ear panicle in winter wheat were positively correlated with grain yield and grain weight, and negatively correlated with grain number per panicle. DhimaN et al. (1980) also demonstrated that the area of ​​flag leaf is closely related to grain yield. The yield of wheat grain is related to its abundance. In most areas of our province, wheat grains were poorly filled and grain weight was low in the year