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对三个早熟粳稻品种结实期的物质积累和分配研究表明，三品种在氮素分配和净光合产物分配的大趋势是相同的。即穗、茎、鞘、叶在抽穗后都有一个缓慢的增长过程，五天后，除穗粒继续增长而呈现出Ｓ曲线增长以外，其它均呈现缓慢的下降趋势；从茎、鞘、叶三个器官的输出物质对子粒的贡献程度来看，叶片的贡献程度最大，其输出的氮素量占子粒积累总量的２１％～３３％；不同品种的平均含氮水平不同，这种差异在结实期的不同阶段表现出相同的趋势，均以合江１９＞东农４１６＞松粳２号的顺序出现，并且含氮水平高的品种在结实期积累的干物质及子粒干重都高。
Studies on the material accumulation and distribution during the grain-filling stage of three precocious japonica cultivars showed that the general trend of nitrogen distribution and net photosynthate distribution of the three cultivars was the same. That is to say, ear, stem, sheath and leaf had a slow growth process after heading. Five days later, the growth of spikelets showed a slowly decreasing trend except that the spikelets continued to grow. The contribution of the output of the organs to the grain shows that the leaves contribute the most, and the output of nitrogen accounts for 21% ~ 33% of the total grain accumulation. The differences of the average nitrogen content of different varieties are in the range of The same trend was observed in different stages of the grain-filling stage, all occurring in the sequence of Hejiang 19> Dongnong 416> Songjing 2, and the dry weight of the dry matter and grain accumulated during the grain-filling stage were all high.