[目的]为烤烟生产中打顶措施对烟叶质量影响提供理论依据.[方法]以烤烟云烟87为研究材料,对打顶后烤烟中上部烟叶化学成分进行分析比较.[结果]烤烟打顶后,烟碱含量急剧上升,其中上部叶累积高峰在打顶后第45天,中部叶在第30天;总氮含量呈逐渐下降趋势,且上部叶下降趋势快于中部烟叶;上部叶淀粉含量不断增加,而中部叶由于成熟而逐渐分解;总糖和还原糖一直处于升高趋势;钾素随着打顶进程降低;多酚和石油醚提物均增加.[结论]打顶能够影响烟叶中化学成分的积累,选择适宜的时机打顶可以使烟株体内的养分分配更合理.%[ Objective ] This paper aims to provide theoretical reference of each measure in tobacco production on tobacco leaves quality.[ Method ] Taking tobacco as investigation material, chemical component of upper leaves of are compared. [ Results ] After topping in fluecurred tobacco, nicotine content increases quickly. There are the highest climaxes 45 days in upper leaf and 30 days in middle leaf after topping. Total nitrogen content decreases gradually. Nitrogen has an increase trend of exponent index. Total sugar content reduces but sugar content increases gradually. Starch contents have a contrast between upper leave and middle leaf: upper leaf increases while middle leaf decreases all along. [ Results] Topping could influence the accumulation of chemical components in tobacco. Topping at right time could make nutrition allocation in tobacco more reasonable.
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