The aim was to study the effects of reducing nitrogen application amount on yield and quality of flue-cured tobacco in Yunnan Province under different rainfall conditions.The simulation test was carried out in artificial climate chamber using the tobacco cultivar K326 as test material to study the agronomic traits,photosynthetic characteristics,yield and quality under different rainfall and nitrogen reduction ratio.The results showed that with the appropriate reduction of nitrogen fertilizer,the agronomic traits,photosynthetic characteristics,yield and quality of flue-cured tobacco were improved obviously,and with the increase of rainfall,the determination indexes of flue-cured tobacco treated with the same nitrogen were basically increased firstly and then decreased.Respectively,the optimum nitrogen amounts in the areas with lower,moderate and higher rainfall were N_25％ (3.75 g per plant),N_35％ (3.25 g per plant) and N_25％ (3.75 g per plant),which could be popularized after field test.%为探讨不同降雨量条件下氮肥减施对云南烤烟产质量的影响,在人工气候室内进行模拟试验,以烤烟K326为供试材料,研究了不同降雨量、不同氮肥减施比例对烤烟农艺性状、光合特性和产质量的影响.结果表明,随着氮肥的适当减施,烤烟的农艺性状、光合特性和产质量都有较明显的改善,且随着降雨量的增加,相同减氮处理烤烟各测定指标基本呈现出先上升后降低的变化趋势.降雨量偏低的区域、适中的区域和偏高的区域,分别以N-25％处理(3.75g/株)、N-35％处理(3.25 g/株)和N-25％处理(3.75g/株)最佳,建议在生产中先进行大田验证试验后推广应用.
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