Fecha de publicación: 29/01/2021 Fuente: Wipo Tobacco Agriculture The invention discloses a flue-cured tobacco upper leaf modulation method, which is characterized in that tobacco leaf raw materials are put into a curing barn for curing after being subjected to earlier stage treatment. The method comprises the steps of 1) earlier stage of yellowing, 2) middle stage of yellowing, 3) later stage of yellowing, 4) earlier stage of color fixing, 5) later stage of color fixing, and 6) stem drying stage. The earlier stage treatment of the tobacco leaf raw materials comprises chopping and harvesting, hanging on a rod and charging, wherein the chopping and harvestingrefers to chopping and harvesting 4-6 pieces of fresh tobacco leaves at the upper part, the chopping and harvesting position is 10-15cm below the top, and the fresh tobacco leaves need to have the following obvious characteristics: mature spots, white and bright main veins and leaf edge and leaf tip curl hook sagging. According to the modulation method, modulation is conducted by accurately controlling the temperature rising speed, the temperature and humidity points and the temperature stabilizing time of each stage and observing the change condition of the tobacco leaves of each stage according to the baking characteristics of the upper tobacco leaves with stems. The method is easy to operate and flexible in adjustment, and achieves the baking targets of reducing labor and cost, reducing the proportion of ash-hanging miscellaneous tobacco, improving the income of tobacco growers and the like.