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前言水稻籽粒三分之二以上的干物质是来自抽穗后的光合产物。因此,水稻抽穗后叶片的光合能力对于水稻产量的形成具有重要意义。水稻成熟期间叶片氮素伴随光合产物,不断地输向籽粒,因而叶片氮素不断下降,齐穗期追肥能够有效地提高成熟期叶片含氮量而成熟期间叶片含氮量则在一定范围内与光合能力存在直线关系,与抽穗后干物质的增加量和谷粒产量也有着正相关性。
Introduction Two-thirds or more of dry matter from rice grains is derived from photosynthetic products after heading. Therefore, photosynthetic capacity of rice leaves after heading is of great importance to the formation of rice yield. During the ripening period of rice, the nitrogen of the leaves was continuously transported to the grain along with the photosynthate, and the nitrogen of the leaves decreased continuously. Topdressing fertilizer could effectively increase the nitrogen content of mature leaves and the nitrogen content of leaves at maturity. There is a linear relationship between photosynthetic capacity and dry matter and heading after the increase in grain yield also has a positive correlation.