1. "Three-stage and Five-step" curing technology of flue-cured tobacco. Key points of baking process: high temperature and high humidity turn yellow, low temperature and low humidity set color, high temperature turn yellow fully, slowly raise temperature to set color, pay attention to wet bulb temperature and reduce dry bar temperature.
2. First, yellowing stage: For tobacco leaves with small water content, thick leaves and sufficient content, in the yellowing stage, it is necessary to turn yellow at high temperature, and the dry bulb reaches above 38℃. It is necessary to extend the yellowing time to ensure that tobacco leaves turn yellow and soft. When the humidity is low, water should be sprayed on the ground before 36℃ for humidification.
3. Second, the color fixing stage: mainly baking, baking incense and reducing color difference. Increase firepower, strengthen dehumidification, stabilize wet bulb, slowly raise temperature, and extend the time in the later stage of fixation (53 ~ 54℃) to promote the formation of aroma substances in tobacco leaves.
4. Third, dry reinforcement stage: limit the dry bulb temperature below 65℃ when smoking, control the wet bulb temperature, reduce ventilation and put out the fire in time.
Extended data
direct sowing culture
The direct seeding cultivation method of flue-cured tobacco can save labor for seedling raising, transplanting and topdressing, shorten planting time, save peat and seedling tray, and save seedling greenhouse. It is a patent invented by Guizhou Tobacco Research Institute. It was published in China National Intellectual Property Administration 20 12,110,21. The operation points of this method are as follows:
1. Step 1: Arrange the tobacco field and unpack it one and a half months in advance, apply base fertilizer along the middle line of the ridge bottom, then ridging, and replenish the moisture in the ridge until it rains.
2. Step 2, punch holes after the rain stops, and apply plant ash mixed with underground insect repellent in the holes.
3. Step 3: Sow seeds in holes, each hole is 1 grain, and then spray transplanting agent into holes until plant ash and coated seeds are wet, and cover them with plastic film.
4. Step 4: When the seeds germinate and emerge and grow into two leaves with one heart, the membrane is broken and the hole is broken. When the tobacco seedlings grow to a height of 20cm, the fertilizer is applied again, and the fertilizer is applied to the holes at the roots of the tobacco plants, and the holes are filled with soil. When the tobacco plant grows to 50 cm high, uncover the film and cultivate the soil to prevent diseases and insect pests, timely top-shoot and bud, and harvest and bake it in time after maturity.
Reference source: Baidu Encyclopedia-Flue-cured tobacco