The effects of different nitrogen application rates on stem traits and yield of high-quality fragrant rice Luyou 2025 were studied.The results showed that with the increase of nitrogen rate,the fourth and fifth internodes length increased,and the third internode length increased first,then decreased slightly and then increased.Culm diameter was increased,culm wall thickness of the third and fourth internode thinned,but the fifth internode showed an irregular trend.Length and weight of each internode,especially the basal internode to the ear top increased significantly.breaking resistance of each internode decreased significantly,while the bending moment and lodging index of each internode increased significantly.The effective panicle number was increased significantly,while the seed setting rate and 1000-grain weight decreased,yield and total grain number per panicle were the highest under the treatment of 150 kg/hm2.
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