Study on Maturity of One-Time Harvesting of Four Lower Flue-Cured Tobacco Leaves in Tobacco-Rice Rotation Field
To explicit the suitable maturity for one-time harvesting of lower leaves of paddy-tobacco,the low-maturity,medium-maturity,and high-maturity treatments were designed with Yunyan 87 materials in Guiyang,Hunan province.The tobacco quality and economic traits of flue-cured tobacco were comprehensively evaluated by fuzzy evaluation method.The results showed that with the maturity of lower tobacco leaves increased,SPAD value of fresh tobacco leaves decreased;the proportion of microstrip green tobacco leaves decreased,and the proportion of variegated tobacco increased;tobacco leaf structure loose,tobacco leaf oil content increased,the single leaf weight decreased,and the equilibrium moisture content decreased;the contents of total sugar,reducing sugar,chlorogenic acid decreased,nicotine and starch increased;the yield and output value of tobacco leaves decreased.The appearance quality index,the physical character index,availability index of chemical components,total score of smoking quality,the economic properties index and index of tobacco quality in medium maturity treatment were the highest.The suitable harvest maturity of lower leaves of Yunyan 87 in Guiyang tobacco-growing area of Hunan province required light green leaves,light green-white 1/3 of main veins,leaf edge slightly curled,leaf surface without mature spots.The SPAD values for guiding harvest ranged from 19.39 to 26.63.
Paddy-tobaccoLower tobacco leavesHarvesting at one timeSuitable harvest maturityFuzzy comprehensive evaluation
NETL
NSTL
万方数据
