Effect of Foliar Topdressing on the Quality and Industrial Availability of the Six Upper Leaves of Yunyan 99
[Objective]To explore the best time and method of top-dressing for the upper six leaves in Lincang tobacco-growing area,Yunnan Province,and to improve the industrial availability of the upper six leaves.[Method]The techniques of extracting potassium and promoting yellowing in the upper six leaves were studied by applying different foliar fertilizers,and the aroma components of B2F in the first flue-cured to-bacco leaves were detected,availability index values of analytical chemistry,physical properties,appearance quality,sensory quality,and eco-nomic traits were calculated and the combined effect index of different fertilization treatments was calculated.[Result]Spraying different foliar fertilizers could improve the maturity of tobacco leaves and promote the growth of tobacco plants.The total sugar and reducing sugar of the upper leaves were higher,and the lower content of potassium ion resulted in lower rate of potassium and lower coefficient of variation,in the analysis of aroma components,cetane-like compounds,carotenoid degradation products,maillard reaction compounds and other aroma components were the most suitable raw materials for top-leaf flue-cured tobacco.Sensory quality,appearance quality and other indicators were sprayed'KALI'foliar fertilizer as the best treatment;The industrial availability index of chemical composition,sensory quality,appearance quality,physical properties and sensory quality was the highest in'KALI'foliar fertilizer treatment(59.84).[Conclusion]Applying foliar fertilizer properly can improve the yield,quality and economic benefit of upper leaves in tobacco-growing areas of Lincang,Yunnan Province,after topping the 3rd day mixed with water fully dissolved Red Bull nail after the interval of 5-7 days for foliar spray 2 times,2 250 g/hm2 dose had the best effect.
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