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Different harvest maturity effect on the soluble sugars and the quality of flue-cured tobacco

ZHANG Shu-tang,DUAN Yu-qi(Yunnan Academy of Tobacco Agricultural Science,Yuxi 653100,China)  
4 treatments on harvesting were designed and the experiment for different harvest maturity effect on the soluble sugar and the quality of flue-cured tobacco was carried out.The results indicated that total sugar,reduce sugar and starch gradually increased with the delay of harvest time and improvement of mature degrees,when reached a peak,the content of total sugar,reduce sugar and starch declined with the aging of tobacco and the declined of synthesis capacity.Among the four soluble sugars,the glucose was the maximum,accounted for 33% ~40%;fructose followed,accounted for 32% ~38%;sucrose was lower,accounted for 20% ~27%;maltose was the minimum,accounted for 5%~8%.Based on comprehensive consideration of tobacco appearance quality,inherent chemical components and smoking quality,it can be concluded that when the lower leaves was transplanted after 70(±3) days,middle leaves was transplanted after 90(±4) days,upper leaves was transplanted after 125(±5) days,the treatment for harvesting was the best.The ripening features of upper 5~6 leaves in one-time harvest was that top 1th~3th leaves green yellow to yellow,the color yellowing 60% ~80%,main vein whitening two-thirds,leaf yellowing near top 4th~6th leaves,120~130 days after transplanting.
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