Effects of Nitrogen Rates on Plant Growth Period,Leaf Quality and Style of Nicotiana tabacum L.CB-1

Field experiments,chemical analysis and sensory test were carried out to study the effects of different nitrogen fertilizer rates on the growth period,yield,quality and style of flue-cured tobacco leaves.The results showed that,growth period,economic character,appearance,chemical composition,sensory test results and style of flue-cured tobacco were influenced remarkably by different rates of nitrogen applied.Plant growth period prolonged obviously;the yield,weight per leaf,total nitrogen content and nicotine content increased evidently;total sugar content,reducing sugar content,the ratio of reducing sugar to nicotine and total nitrogen to nicotine decreased,and the delicate aroma style of flue-cured leaves was weakened with the increasing nitrogen rates.The increase of value of product wasn't distinct while the nitrogen amount exceeded 78 kg/hm2.Chemical composition,appearance and sensory test results were better;the delicate aroma style of flue-cured leaves was distinct,with the nitrogen applying from 58.5 to 97.5 kg/hm2.