In order to understand the fertilizer requirement characteristics of flue -cured tobacco new varieties Yuyan 7 and Yuyan 9 in western Henan , taking Yunyan 87 as the control , we carried out the field experiment with two treatments to study the effects of different nitrogen fertilizer application rates on the agronomic traits and economic traits of flue -cured tobacco , as well as the chemical compositions and quality of the baked tobacco leaves .The results showed that the growth vigor of Yuyan 7 and Yuyan 9 was better , their yield was higher , chemical compositions were coordinative , and the economic benefits and sensory quality were the best when 37.5 kg/hm2 nitrogen was applied .In the treatment of 52.5 kg/hm2 nitrogen application , the growth vigor of these two new varieties was stronger , and their yield was higher , but their proportion of middle -superior tobacco leaves was obviously de-creased, and their economic benefits and sensory quality were lower than those in the treatment of 37.5 kg/hm2 nitrogen application. The pure nitrogen requirement of two new varieties was 22.5~37.5 kg/hm2 less than that of Yunyan 87.%为了得到烤烟新品种豫烟7号、豫烟9号在豫西烟区的需肥特性，以云烟87（ CK ）为对照，设置2个大田试验处理，研究了不同氮肥用量对烤烟农艺性状、经济性状、烤后烟化学成分和烟叶质量的影响。结果表明：豫烟7号和豫烟9号在37．5 kg/hm2氮用量水平长势较强、产值量较高，化学成分协调、经济效益和感官质量最好；在52．5 kg/hm2氮用量水平下长势强、产量高，但中上等烟比例明显下降，经济效应和感官质量次于37．5 kg/hm2氮用量水平。新品种需氮量较小，比云烟87施纯氮少22．5～37．5 kg/hm2。
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