Method for improving quality of yellow sun-cured tobacco leaves in cloudy and rainy weather

Abstract

According to the method for improving the quality of the yellow sun-cured tobaccos in the cloudy and rainy weather, macromolecular substances such as starch and protein in the tobaccos can be fully degraded and converted by controlling different temperatures and humidity in different stages, and the oil content, elasticity and fragrance of the tobaccos are improved by utilizing organic acid and compound enzyme in the color fixing stage of the tobaccos, so that the quality of the yellow sun-cured tobaccos in the cloudy and rainy weather is improved. In the tobacco leaf fermentation period, the aroma of the tobacco leaves is modulated by using the complex microbial inoculants, so that the problems of poor tobacco leaf quality, dim luster and insufficient aroma of the yellow sun-cured tobacco in rainy weather are solved to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco leaf sun-curing, and in particular to a method for improving the quality of sun-cured yellow tobacco leaves in rainy and cloudy weather. Background Art

[0002] Sun-cured yellow tobacco has a long history of cultivation and application in China. It has the characteristics of bright yellow color, mellow leaves, sufficient oil content, moderate smoking intensity, large amount of aroma, and strong combustibility. The production process of sun-cured tobacco is simple and ancient. The traditional sun-curing process of sun-cured yellow tobacco is carried out in the open air, using natural resources such as external light and heat to promote the change of moisture and color of tobacco leaves, so that the tobacco leaves are dried, discolored, and transformed into aroma-bearing substances to produce suitable sun-cured yellow tobacco leaves. However, the conventional open-air sun-curing method is affected by rainy and cloudy weather, resulting in abnormal harvesting and modulation of tobacco leaves, and then phenomena such as rotten leaves and mildew occur. To improve this phenomenon, the technology of sun-curing tobacco leaves in a sun-curing shed has been promoted in some areas at present. However, in rainy and cloudy weather, due to the lack of light, the degradation and transformation of macromolecular substances in tobacco leaves are insufficient, and the modulated tobacco leaves often have problems such as dull luster, insufficient aroma, heavy miscellaneous odor, and large irritation, affecting the economic value of subsequent tobacco leaves.

[0003] Therefore, it is very necessary to study a method for improving the quality of sun-cured yellow tobacco leaves in rainy and cloudy weather. Summary of the Invention

[0004] The present invention provides a method for improving the quality of sun-cured yellow tobacco leaves in rainy and cloudy weather, which can improve the quality of sun-cured yellow tobacco leaves in rainy and cloudy weather and ensure the economic value of tobacco leaves to a certain extent.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A method for improving the quality of sun-cured yellow tobacco leaves in rainy and cloudy weather includes the following steps:

[0007] (1) Wilting stage: Harvest fresh sun-cured yellow tobacco leaves, hang them with sun-curing poles, place them in a sun-curing shed, control the humidity in the shed to be 80-85%, control the rope distance between tobacco leaves to be 15-20 cm. If the daytime temperature is lower than 30°C, turn on the warm air equipment or ground heating device. During the wilting stage, use an indoor fan to accelerate air circulation, and control the temperature to be maintained at 25-28°C for 5-8 hours every night until wilting is completed;

[0008] (2) Yellowing stage: Close the sun-curing shed, control the humidity in the sun-curing shed to be 70-80%. If the daytime temperature is lower than 30°C, turn on the warm air equipment or ground heating device. During the yellowing stage, use an indoor fan to accelerate air circulation, and control the temperature to be maintained at 27-30°C for 5-8 hours every night until the tobacco leaves turn from light yellow to dark yellow and the tips and edges of the tobacco leaves are hooked and curled;

[0009] (3) Fixing period: Spraying the fixing improvement liquid on the surface of the tobacco leaves in a spray manner until the moisture content of the mesophyll in the tobacco leaves increases by 1-2%. The fixing improvement liquid contains 0.01-0.05 wt% of mixed organic acids and 0.05-0.1 wt% of complex enzymes. The mixed organic acids are composed of cinnamic acid and citric acid, and the complex enzymes are composed of pectin lyase, α-amylase and glucoamylase. Adjust the temperature in the drying shed to 31-33 °C and the humidity to 60-65%. After drying for 22-24 h, adjust the rope distance between the tobacco leaves to 8-12 cm, and slowly raise the temperature by 2-3 °C until the moisture content of the mesophyll of the tobacco leaves is dried to 80-85% and the moisture content of the main vein is dried to 60-70%.

[0010] (4) Fermentation period: Spraying a 0.3-0.6 wt% aqueous solution of complex bacterial agents on the surface of the tobacco leaves in a spray form until the moisture content in the mesophyll of the tobacco leaves increases by 1-2%. In the aqueous solution of complex bacterial agents, the complex bacterial agents are composed of Lactobacillus and Monascus ruber. After the tobacco leaves are dried for 2-3 h, they are transferred to a fermentation chamber. There is a ground heating device or a heated fermentation container in the fermentation chamber for stacking the tobacco leaves in layers. Control the heating temperature of the ground heating device or the fermentation container to 30-33 °C, and the humidity in the fermentation chamber to 60-65%. Cover the tobacco leaves with a film and seal them for fermentation for 72-96 h, and turn the pile every 8-10 h, moving the upper-layer tobacco to the bottom layer, the bottom-layer tobacco to the middle layer, and the middle-layer tobacco to the upper layer.

[0011] (5) Stem-drying period: Transfer the fermented tobacco leaves back to the drying shed for drying, and control the humidity in the shed to 50-55% until the stem-drying is completed.

[0012] Preferably, in step (3), the complex enzymes are composed of pectin lyase, α-amylase and glucoamylase in a mass ratio of 3-5:2-1:1.

[0013] Preferably, in step (3), the mixed organic acids are composed of cinnamic acid and citric acid in a mass ratio of 5-9:1.

[0014] Preferably, in step (4), the aqueous solution of complex bacterial agents further contains 0.02-0.05 wt% of sugarcane leaf polysaccharide.

[0015] Preferably, in step (4), the complex bacterial agents are composed of Lactobacillus and Monascus ruber in a mass ratio of 4-6:1.

[0016] Preferably, in step (3), the heating rate is 1 °C per 2-3 h.

[0017] Preferably, the cinnamic acid is plant-derived cinnamic acid. Before being prepared into an aqueous solution, it is pre-dissolved with ethanol.

[0018] The method for improving the quality of sun-cured tobacco leaves in rainy and cloudy weather as described above has the following advantages:

[0019] (1) In rainy and cloudy weather, there are often problems of high temperature and high humidity in the south. The present invention uses a drying shed to modulate tobacco leaves, and controls different temperatures and humidities at different stages, so that macromolecular substances such as starch and protein in the tobacco leaves can be fully degraded and transformed, thereby better enhancing the aroma of the tobacco leaves.

[0020] (2) During the color-fixing period of the tobacco leaves, organic acids and composite enzymes are used to more fully degrade and transform more substances such as pectin, starch, and chlorophyll in the leaves. At the same time, it helps the leaves maintain an appropriate water loss rate under appropriate temperature and humidity control, so that the tobacco leaves can obtain better oil content, elasticity and aroma, and improve the problems of dull luster and insufficient aroma of sun-cured yellow tobacco in rainy and cloudy weather.

[0021] (3) During the fermentation period of the tobacco leaves, composite microbial agents are used to further ferment and decompose macromolecular substances in the tobacco leaves, and reduce the impact of high contents of total nitrogen, nitrates, and nicotine caused by insufficient light on the aroma, so as to better modulate the aroma and improve the problems of heavy miscellaneous odors and strong irritation of sun-cured yellow tobacco in rainy and cloudy weather. Specific embodiments

[0022] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0023] The cinnamic acid used in this embodiment is obtained by separation and purification from cinnamon bark.

[0024] Embodiment 1

[0025] A method for improving the quality of sun-cured yellow tobacco leaves in rainy and cloudy weather, comprising the following steps:

[0026] (1) Wilting period: Harvest fresh sun-cured yellow tobacco leaves, hang them with drying poles, place them in a drying shed, control the humidity in the shed at 80-85%, control the rope distance between the tobacco leaves at 20 cm, if the daytime temperature is lower than 30°C, then turn on the warm air equipment or ground heating device. During the wilting period, use an indoor fan to accelerate air circulation, and control the temperature to remain at 26-28°C for 8 hours every night until wilting is completed;

[0027] (2) Yellowing stage: Close the drying shed, control the humidity in the drying shed at 70 - 80%, if the daytime temperature is lower than 30°C, then turn on the warm air equipment or the ground heating device. During the yellowing stage, use the indoor fan to accelerate air circulation, control the temperature at 28 - 30°C for 8 hours every night until the tobacco leaves turn from light yellow to dark yellow and the tips and edges of the tobacco leaves curl;

[0028] (3) Fixing color stage: Spray the fixing color improvement liquid on the surface of the tobacco leaves in a spray manner until the moisture content of the mesophyll in the tobacco leaves increases by 1.5%. The fixing color improvement liquid contains 0.04wt% of mixed organic acids and 0.08wt% of composite enzymes. The mixed organic acids are composed of cinnamic acid and citric acid in a mass ratio of 8:1, and the composite enzymes are composed of pectin lyase, α - amylase and glucoamylase in a mass ratio of 4:2:1. Adjust the temperature in the drying shed to 31 - 33°C and the humidity to 60 - 65%. After drying for 24 hours, adjust the rope distance between the tobacco leaves to 10 cm, slowly raise the temperature by 2°C until the moisture content of the mesophyll of the tobacco leaves dries to 80 - 85% and the moisture content of the main vein dries to 60 - 70%;

[0029] (4) Fermentation stage: Spray the 0.5wt% aqueous solution of composite microbial agents on the surface of the tobacco leaves in a spray form until the moisture content of the mesophyll in the tobacco leaves increases by 1.5%. In the aqueous solution of composite microbial agents, the composite microbial agents are composed of Lactobacillus and Monascus purpureus in a mass ratio of 5:1. After the tobacco leaves are dried for 2 hours, transfer them to the fermentation chamber. There is a ground heating device or a heated fermentation container in the fermentation chamber for stacking the tobacco leaves in layers. Control the heating temperature of the ground heating device or the fermentation container at 30 - 33°C and the humidity in the fermentation chamber at 60 - 65%. Cover the tobacco leaves with a film and seal them for fermentation for 72 hours, turning the pile every 8 hours, moving the upper layer of tobacco to the bottom layer, the bottom layer of tobacco to the middle layer, and the middle layer of tobacco to the upper layer;

[0030] (5) Stem - drying stage: Move the fermented tobacco leaves back to the drying shed for drying, control the humidity in the shed at 50 - 55% until the stem - drying is completed.

[0031] Example 2

[0032] A method for improving the quality of sun - cured yellow tobacco leaves in rainy and cloudy weather, comprising the following steps:

[0033] (1) Wilting stage: Harvest fresh sun - cured yellow tobacco leaves, hang them with drying poles, place them in the drying shed, control the humidity in the shed at 80 - 85%, control the rope distance between the tobacco leaves at 20 cm, if the daytime temperature is lower than 30°C, then turn on the warm air equipment or the ground heating device. During the wilting stage, use the indoor fan to accelerate air circulation, control the temperature at 26 - 28°C for 7 hours every night until the wilting is completed;

[0034] (2) Yellowing stage: Close the drying shed, control the humidity in the drying shed at 70 - 80%, if the daytime temperature is lower than 30°C, then turn on the warm air equipment or the ground heating device. During the yellowing stage, use the indoor fan to accelerate air circulation, control the temperature at 28 - 30°C for 7 hours every night until the tobacco leaves turn from light yellow to dark yellow and the tips of the tobacco leaves hook and curl;

[0035] (3) Fixing color stage: Spray the fixing color improvement liquid on the surface of the tobacco leaves in a spray manner until the moisture content of the mesophyll in the tobacco leaves increases by 1.5%. The fixing color improvement liquid contains 0.02wt% of mixed organic acids and 0.06wt% of composite enzymes. The mixed organic acids are composed of cinnamic acid and citric acid in a mass ratio of 8:1, and the composite enzymes are composed of pectin lyase, α - amylase and glucoamylase in a mass ratio of 4:2:1. Adjust the temperature in the drying shed to 31 - 33°C and the humidity to 60 - 65%. After drying for 24 hours, adjust the rope distance between the tobacco leaves to 12 cm, and slowly raise the temperature by 2°C until the moisture content of the mesophyll of the tobacco leaves dries to 80 - 85% and the moisture content of the main vein dries to 60 - 70%;

[0036] (4) Fermentation stage: Spray the 0.45wt% composite bacterial agent aqueous solution on the surface of the tobacco leaves in a spray form until the moisture content in the mesophyll of the tobacco leaves increases by 1.5%. In the composite bacterial agent aqueous solution, the composite bacterial agent is composed of Lactobacillus and Monascus purpureus in a mass ratio of 5:1, and also contains 0.05wt% of sugarcane leaf polysaccharide. After the tobacco leaves are dried for 2 hours, transfer them to the fermentation chamber. There is a ground heating device or a heating fermentation container in the fermentation chamber to stack the tobacco leaves in layers. Control the heating temperature of the ground heating device or the fermentation container at 30 - 33°C and the humidity in the fermentation chamber at 60 - 65%. Cover the tobacco leaves with a film and seal them for fermentation for 72 hours, and turn the pile every 8 hours, move the upper layer of tobacco to the bottom layer, the bottom layer of tobacco to the middle layer, and the middle layer of tobacco to the upper layer;

[0037] (5) Stem - drying stage: Move the fermented tobacco leaves back to the drying shed for drying, control the humidity in the shed at 50 - 55% until the stem - drying is completed.

[0038] Example 3

[0039] A method for improving the quality of sun - cured yellow tobacco leaves in rainy weather, comprising the following steps:

[0040] (1) Wilting stage: Harvest fresh sun - cured yellow tobacco leaves, hang them with drying poles, place them in the drying shed, control the humidity in the shed at 80 - 85%, control the rope distance between the tobacco leaves at 20 cm, if the daytime temperature is lower than 30°C, then turn on the warm air equipment or the ground heating device. During the wilting stage, use the indoor fan to accelerate air circulation, control the temperature at 26 - 28°C for 6 hours every night until the wilting is completed;

[0041] (2) Yellowing stage: Close the drying shed, control the humidity in the drying shed at 70 - 80%, if the daytime temperature is lower than 30°C, then turn on the warm air equipment or the ground heating device. During the yellowing stage, use the indoor fan to accelerate air circulation, control the temperature at 28 - 30°C for 6 hours every night until the tobacco leaves turn from light yellow to dark yellow and the tips and edges of the tobacco leaves curl;

[0042] (3) Fixing color stage: Spray a fixing color improving solution of 0.02wt% mixed organic acid aqueous solution and 0.05wt% complex enzyme aqueous solution on the surface of the tobacco leaves until the moisture content of the mesophyll in the tobacco leaves increases by 1.5%. The fixing color improving solution contains 0.04wt% of mixed organic acid and 0.08wt% of complex enzyme. The mixed organic acid is composed of cinnamic acid and citric acid in a mass ratio of 8:1, and the complex enzyme is composed of pectin lyase, α - amylase and glucoamylase in a mass ratio of 4:2:1. Adjust the temperature in the drying shed to 31 - 33°C and the humidity to 60 - 65%. After drying for 24 hours, adjust the rope distance between the tobacco leaves to 10 cm, and slowly raise the temperature by 2°C until the moisture content of the mesophyll of the tobacco leaves dries to 80 - 85% and the moisture content of the main vein dries to 60 - 70%;

[0043] (4) Fermentation stage: Spray a 0.3wt% complex bacterial agent aqueous solution on the surface of the tobacco leaves until the moisture content in the mesophyll of the tobacco leaves increases by 1.5%. In the complex bacterial agent aqueous solution, the complex bacterial agent is composed of Lactobacillus and Monascus purpureus in a mass ratio of 5:1, and also contains 0.04wt% of sugarcane leaf polysaccharide. After the tobacco leaves are dried for 2 hours, transfer them to the fermentation chamber. There is a ground heating device or a heating fermentation container in the fermentation chamber to stack the tobacco leaves in layers. Control the heating temperature of the ground heating device or the fermentation container at 30 - 33°C and the humidity in the fermentation chamber at 60 - 65%. Cover the tobacco leaves with a film and seal them for fermentation for 96 hours, and turn the pile every 10 hours, move the upper layer of tobacco to the bottom layer, the bottom layer of tobacco to the middle layer, and the middle layer of tobacco to the upper layer;

[0044] (5) Stem - drying stage: Move the fermented tobacco leaves back to the drying shed for drying, control the humidity in the shed at 50 - 55% until the stem - drying is completed.

[0045] Comparative Example 1

[0046] Comparative Example 1 is basically the same as Example 2, but the fixing color improving solution is not used in step (3).

[0047] Comparative Example 2

[0048] Comparative Example 2 is basically the same as Example 2, but the complex bacterial agent aqueous solution (and sugarcane leaf polysaccharide is not used either) is not used in step (4).

[0049] Comparative Example 3

[0050] A method for improving the quality of sun - cured tobacco leaves in rainy and cloudy weather, comprising the following steps:

[0051] (1) Wilting stage: Harvest fresh sun-cured tobacco leaves, hang them on drying poles, place them in a drying shed, control the humidity in the shed at 80 - 85%, control the rope distance between the leaves at 20 cm. If the daytime temperature is lower than 30°C, turn on the warm air equipment or the ground heating device. During the wilting stage, use the indoor fan to accelerate air circulation until wilting is completed;

[0052] (2) Yellowing stage: Close the drying shed, control the humidity in the drying shed at 70 - 80%. If the daytime temperature is lower than 30°C, turn on the warm air equipment or the ground heating device. During the yellowing stage, use the indoor fan to accelerate air circulation until the leaves turn from light yellow to dark yellow and the tips of the leaves are hooked and curled;

[0053] (3) Color-fixing stage: Adjust the temperature in the drying shed to 31 - 33°C and the humidity to 60 - 65%. After drying for 24 hours, adjust the rope distance between the leaves to 12 cm, and slowly raise the temperature by 2°C until the moisture content of the leaf mesophyll is dried to 80 - 85% and the moisture content of the main vein is dried to 60 - 70%;

[0054] (4) Fermentation stage: Transfer the leaves to a fermentation room. There is a ground heating device in the fermentation room or there are heat-generating fermentation containers. Stack the leaves in layers. Control the heating temperature of the ground heating device or the fermentation containers at 30 - 33°C and the humidity in the fermentation room at 60 - 65%. Cover the leaves with a film and seal them for fermentation for 72 hours. Turn the pile every 8 hours, move the upper-layer leaves to the bottom layer, the bottom-layer leaves to the middle layer, and the middle-layer leaves to the upper layer;

[0055] (5) Stem-drying stage: Move the fermented leaves back to the drying shed for drying, control the humidity in the shed at 50 - 55% until stem-drying is completed.

[0056] Pick the middle leaves of the tobacco on a sunny day. The picking location is at the production base of the Second Team of the Tropical Crops Research Institute. According to the above Examples 1 - 3, Comparative Examples 1 - 3, and the local traditional drying method in rainy weather, dry the tobacco leaves in rainy weather in 2024, and compare various indicators of the obtained dried tobacco leaves.

[0057] I. Appearance

[0058] Table 1 Comprehensive evaluation of the appearance quality of the middle leaves of sun-cured tobacco

[0059]

[0060] Comparing from the appearance, the color of the sun-cured tobacco modulated by the method in this example is relatively uniform, showing dark yellow and golden yellow, with bright luster and sufficient oil content, which can solve the problem of dull luster of tobacco dried in rainy weather to a certain extent.

[0061] II. Chemical components in tobacco leaves

[0062] Table 2 Conventional Chemical Indexes of the Middle Leaves of Sun-Cured Tobacco

[0063]

[0064]

[0065] Comparing from the chemical components, the sun-curing method of this embodiment can increase the content of reducing sugar in the tobacco leaves, making the sugar-alkali ratio of the tobacco leaves more coordinated.

[0066] III. Sensory Quality Evaluation

[0067] The above-mentioned tobacco leaves are used to make cigarettes, added to Zhenlong cigarettes, the addition amount is 12%, and compared with Zhenlong cigarettes for sensory quality evaluation. The results are shown in Table 3:

[0068] Processing Sensory evaluation Example 1 The taste is relatively mellow, the aroma characteristics are maintained, the aroma is soft, the fineness of the smoke is good, and the sweet note is weak Example 2 The taste is mellow, the aroma characteristics are maintained, the aroma is soft, the fineness of the smoke is good, and the sweet note is better Example 3 The taste is mellow, the aroma characteristics are maintained, the aroma is soft, the fineness of the smoke is good, and the sweet note is better Comparative example 1 The aroma characteristics become weak, the aroma weakens, there is a slight off-flavor, and the sweet note is weak Comparative example 2 The aroma characteristics become weak, the aroma weakens, there is a slight off-flavor, and the fresh aroma performance is better Comparative example 3 The aroma characteristics become weak, the aroma weakens, and there is more off-flavor CK The aroma characteristics become weak, the aroma weakens, and there is more off-flavor Zhenlong Cigarette The taste is mellow, the smoke is full and gentle, the aroma is soft, and the fineness of the smoke is good

[0069] Those skilled in the art should note that the embodiments described in the present invention are merely exemplary, and various other substitutions, changes and improvements can be made within the scope of the present invention. Therefore, the present invention is not limited to the above embodiments, but is only defined by the claims.

Claims

1. A method for improving the quality of sun-cured tobacco leaves in rainy weather, characterized in that The following steps are involved: (1) Wilting period: Harvest fresh sun-dried tobacco leaves, hang them on drying poles, and place them in a drying shed. Control the humidity in the shed to 80-85%, and control the rope distance between tobacco leaves to 15-20 cm. If the daytime temperature is lower than 30°C, turn on the heating equipment or ground heating device. During the wilting period, use indoor fans to accelerate air circulation. Keep the temperature at 25-28°C for 5-8 hours every night until wilting is complete. (2) Yellowing period: Close the drying shed and control the humidity in the drying shed to 70-80%. If the temperature is below 30°C during the day, turn on the heating equipment or floor heating device. During the yellowing period, use the indoor fan to accelerate air circulation. Control the temperature at 27-30°C for 5-8 hours every night until the tobacco leaves turn light yellow to dark yellow and the tips of the leaves curl. (3) Color fixation period: Spray the color fixation improvement liquid on the surface of the tobacco leaves in a spraying manner until the moisture content of the mesophyll in the tobacco leaves increases by 1-2%. The color fixation improvement liquid contains 0.01-0.05wt% of mixed organic acid and 0.05-0.1wt% of complex enzyme, wherein the mixed organic acid is composed of cinnamic acid and citric acid, and the complex enzyme is composed of pectin lyase, α-amylase and saccharifying enzyme. Adjust the temperature of the drying shed to 31-33°C and the humidity to 60-65%. After drying for 22-24 hours, adjust the rope distance between the tobacco leaves to 8-12cm, and slowly increase the temperature by 2-3°C until the mesophyll moisture of the tobacco leaves is dried to 80-85% and the main vein moisture is dried to 60-70%. (4) Fermentation period: Spray a 0.3-0.6 wt % aqueous solution of a composite bacterial agent on the surface of tobacco leaves in the form of a spray until the moisture content in the mesophyll of the tobacco leaves increases by 1-2%. The composite bacterial agent in the aqueous solution is composed of lactobacillus and Monascus. After the tobacco leaves are dried for 2-3 hours, they are transferred to a fermentation room. The fermentation room is provided with a floor heating device or a heating fermentation container to stack the tobacco leaves in layers. The heating temperature of the floor heating device or the fermentation container is controlled to be 30-33° C. The humidity in the fermentation room is 60-65%. The tobacco leaves are covered with a film and sealed for fermentation for 72-96 hours. The pile is turned over every 8-10 hours, and the upper layer of tobacco leaves are moved to the bottom layer, the bottom layer of tobacco leaves are moved to the middle layer, and the middle layer of tobacco leaves are moved to the upper layer. (5) Drying period: Move the fermented tobacco leaves back to the drying shed for drying, and control the humidity in the shed to 50-55% until the dry period is complete.

2. The method for improving the quality of sun-cured tobacco leaves in rainy weather according to claim 1, characterized in that: In step (3), the complex enzyme is composed of pectin lyase, α-amylase and saccharifying enzyme in a mass ratio of 3-5:2-1:

1.

3. The method for improving the quality of sun-cured tobacco leaves in rainy weather according to claim 1, characterized in that: In step (3), the mixed organic acid is composed of cinnamic acid and citric acid in a mass ratio of 5 to 9:

1.

4. The method for improving the quality of sun-cured tobacco leaves in rainy weather according to claim 1, characterized in that: In step (4), the composite bacterial agent aqueous solution also contains 0.02-0.05 wt % of sugarcane leaf polysaccharide.

5. The method for improving the quality of sun-cured tobacco leaves in rainy weather according to claim 1 or 4, characterized in that: In step (4), the composite bacterial agent is composed of lactobacillus and Monascus in a mass ratio of 4 to 6:

1.

6. The method for improving the quality of sun-cured tobacco leaves in rainy weather according to claim 1, characterized in that: In step (3), the heating rate is 1°C every 2 to 3 hours.

7. The method for improving the quality of sun-cured tobacco leaves grown in rainy weather according to claim 1 or 3, characterized in that: The cinnamic acid is plant-derived cinnamic acid.

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