针对龙岩烟区近几年来上部烟叶烟碱含量较高而可用性较差的问题 ,通过分析与上部烟叶质量和可用性关系密切的栽培因素变化而引起上部叶质量变化的情况 ,对种植密度、施肥方式、打顶留叶、成熟采收、科学烘烤等农业措施进行定向有效调控 ,达到提高上部烟叶可用性的目的 Aiming at the problem of high nicotine content and poor usability of upper tobacco leaves in Longyan tobacco growing area in recent years, the change of upper leaves quality was analyzed by analyzing the change of cultivation factors closely related with the quality and availability of the upper tobacco leaves. , Topping leaves, mature harvest, scientific baking and other agricultural measures for effective regulation and control of orientation, to achieve the purpose of improving the availability of upper leaves