研究了不同施氮量对水稻国丰一号分蘖成穗 ,株叶形态 ,产量及抗性的影响。结果表明 :国丰一号虽长势繁茂 ,但需氮量中等偏下。其最佳施氮量为 15 7.5kg/hm2 ,施氮量低于该水平 ,分蘖数和有效穗下降 ,营养生长不足 ,产量降低 ;施氮量高于该水平 ,剑叶增长加宽较披 ,植株增高、抗性减弱、结实率、千粒重降低 ,表现减产 The effects of different nitrogen application rates on the tillering heading, morphological traits, yield and resistance of rice Guofeng-1 were studied. The results showed that although the abundance of Guofeng I was growing, the nitrogen requirement was moderately lower. The optimal nitrogen application rate was 15 7.5kg / hm2, the nitrogen application rate was lower than this level, the number of tillers and effective panicles decreased, the vegetative growth was insufficient and the yield was reduced. The nitrogen application rate was higher than this level, , Increased plants, weakened resistance, seed setting rate, reduced 1000-grain weight, and reduced yield