Abstract:

In order to improve the chemical composition and content of volatile aromatic matter of upper leaves and increase the usability of the upper leaves in flue-cured tobacco. The experiment in the effects of threes different harvesting ways (including common picking method (T1), concentrated picking method (T2), and harvesting with stalk (T3)) by tobacco variety ‘Yunyan 87’ were studied. The results indicated that: (1) compared with the commonly used picking method, the harvesting with stalk could increase total sugar content, reducing sugar content and K content, and decrease total N and nicotine, but the content of chlorine did not show large difference between the harvesting with stalk and common picking method. The effects of concentrated picking method (T2) treatment between common picking methods (T1) and harvesting with stalk (T3). (2) The harvesting with stalk could increase significantly the degrading level of chromoplast pigments, the neoplytadiene content of T3 (harvesting with stalk) was 1.61 times for T1, and the content of degraded by carotene of T3 (harvesting with stalk) was 1.61 times for T1 in upper leaf in flue-cured tobacco. (3) The degrading level of non-chromoplast pigment was accelerated markedly with harvesting with stalk in upper leaf in flue-cured tobacco. The content of solanone, maillard reaction and products of aromatic amino acid metabolism by the harvesting with stalk were higher than the common picking method, increased by 28.64%, 28.94%, and 31.79%, respectively. Therefore, it was an effective way to coordinate the chemical composition of cured leaf and to improve the quality of upper leaves by harvesting with stalk, and to increase the usability of upper flue-cured tobacco leaved.