Effects of Topping Methods on Grade Structure,Yield and Quality of'Yunshai-1'Yellow Sun-cured Tobacco
In order to meet the application demand of cigarette industry for yellow sun-cured tobacco materials in flue-cured cigarettes,the best topping method and topping time of yellow sun-cured tobacco in Dehong of Yunnan Province was clarified,and the effects of four topping methods(Ti pinching the top,T2 topping at bud stage,T3 topping at early flowering stage,T4 topping at flowering period)on the agronomic,economic,grade structure and intrinsic chemical quality of'Yunshai 1'yellow sun-cured tobacco were studied.The results showed that the comprehensive performance of T1 treatment was the best,followed by T3 treatment.And the chemical components content of upper and middle tobacco could meet the requirements of high-quality tobacco leaves and the needs of cigarette industry.The chemical quality comprehensive performance of T2 and T3 treatment were better.The nicotine content of upper leaves was over 2％in four treatments,in which T2 treatment was the best,over 2.5％,and T3 treatment was nearly 2.5％.The nicotine content of middle leaves was more than 2.4％,and that of T2 and T3 treatments were close to 3％.So it is suggested that the best method for yellow sun-cured tobacco in Dehong is to top at early flowering stage,followed by topping at bud stage.The best time for topping is in mid-to-late March,or about 110 days after transplanting.
yellow sun-cured tobacco'Yunshai-1'topping methodsgrade structurequality of tobacco leaf
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