With a conventional japonica rice variety Wujingl5 as the material,the effects of different nitrogen application rate on the rice plant type and ear trait characteristics as well as their correlations were studied in this experiment. The results showed that flag leaf length, width and quality got higher as the amount of nitrogen was increased. They reached the maximum of 28. 10 cm,1.22 cm, 0.18 g, respectively, under ST treatment (300 kg/ha), and then got lower. The length and quality of the second inverted leaf displayed a consistent performance with the flag leaf,while the width showed bigger under the treatment ST_15(N 255 kg/ha),ST and ST+15 (N 345 kg/ha) ,through the difference was small. The length, width and quality of the 3rd inverted leaf firstly got higher and then decreased as the amount of nitrogen was increased,and the maximum length of 39. 68 cm appeared under ST+15 treatment, while the maximum width and quality were 1. 13 cm and 0. 21 g under ST treatment. The factor associated with top three leaves affecting the panicle quality was mainly the leaf quality,especially the quality of the 3rd inverted leaf, with the correlation coefficient of 0. 929**. The top two internodes affected the panicle quality with the correlation coefficient of 0. 927**. The longer the two internodes were, the higher the panicle quality was. The source and sink characteristics had the same trend at different levels of nitrogen, and the ratio of sink to source always showed the highest under ST treatment. The plant height was significantly correlated with the ear quality, with the correlation coefficient of 0. 928*. The width of the top three leaves had a great impact on the yield per plant. All of the internodes were positively correlated with the ear quality per plant, but did not reach significant levels.%以常规粳稻品种武粳15号为材料,设5个施氮量处理,研究了不同施氮量下水稻株型及稳部性状的变化及其相关性.结果表明,水稻剑叶的长、宽、质量随着施氮量的增加而增加,ST(300kg/hm2)处理最大,三者分别为28.10 cm、1.22 cm、0.18g,随后降低.倒二叶长和质量的表现与剑叶一致,处理ST-15(255 kg/hm2氮)、ST、ST+15(345 kg/hm2氮)的叶宽均较宽,但差异不大.倒三叶的长、宽、质量随着施氮量的增加而增加,随后降低,长度最大值出现在ST+15处理,为39.68cm,宽度和质量最大值出现在ST处理,分别为1.13 cm、0.21 g.影响穗质量的上三叶因子主要是上三叶质量,尤其是倒三叶质量,相关系数为0.929**.影响穗质量的节间是上二节,相关系数为0.927**,上二节间越长,穗质量越高.不同施氮水平的源库特征变化趋势一致,库源比均以ST处理为最高.株高与单株穗质量相关达到显著水平,相关系数为0.928*.上三叶的宽度对单株产量的影响较大.所有节间与单株穗质量呈正相关,但均未达到显著水平.
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