Effects of Drought Stress on Yield and Quality of Flue-cured Tobacco in Maturing Stage

In order to provide rational guidances for irrigation,improve yield and quality of flue-cured tobacco,effects of drought stress on agronomic traits,relative physiological indicators,yield and quality of flue-cured tobacco in maturing stage were studied.The results showed that plant height,stem circumference,leaf number and maximum leaf length and width decreased with the reduction of soil water content.Moreover,chlorophyll content decreased,while the decline was proportional to the speed and degree of drought stress.Activities of SOD,CAT and POD first increased and then decreased with time passing,the more serious the degree of drought stress was the more obvious the trend.With the reduction of soil water content,the indexes(yield,total sugar content,potassium content,ratio of sugar and alkali,ration of nitrogen and alkali,ration of potassium and chlorine) of each treatment decreased,but total nitrogen content,nicotine content and chlorine content increased.So the yield and quality of flue-cured tobacco were seriously affected by drought stress.