Study on the Suitable Harvesting Time of High Availability Upper Leaves of Flue-cured Tobacco in Lijiang
In order to define the best harvest time of upper leaves of flue-cured tobacco in Yulong County,Lijiang City,optimize the supply and demand structure of tobacco leaves,and provide technical support for high-quality supply of tobacco raw materials.We studied the effects of flue-cured tobacco upper leaf harvest time (8 days in advance,normal and delayed) on the mature harvest characteristics and chlorophyll con-tent of fresh tobacco leaves,the occurrence of tobacco agronomic traits,tobacco weather flare and mosaic disease,and the chemical composition and economic characteristics of cured B2F tobacco leaves by using a completely randomized block experiment in the field. The results showed that with the delayed harvesting of the upper leaves,the angle between the stems and leaves gradually changed from acute angle to obtuse an-gle,the degree of leaf yellowing and leaf vein whitening increased significantly,and the number of villi shedding and mature spots increased. There was no significant difference in agronomic traits (P>0.05),and the SPAD value in the upper leaves gradually decreased,which was in the order of T1>T2>T3;the incidence and release index of tobacco weather flare and Mosaic release in the field were T3>T2>T1.Properly dela-ying the harvesting of upper leaves can improve the yield,output value and proportion of flue-cured tobacco,improve the quality of upper leav-es,and make the chemical components of tobacco more moderate.The characteristic of chemical components of tobacco leaves in different treat-ments is T3>T2>T1.The upper leaves in Yulong County,Lijiang City should be appropriately delayed for 4-7 d to obtain high-quality upper leaves with good quality and high availability.
万方数据
维普
