Method for preventing and controlling damage of corn herbicide to flue-cured tobacco

Abstract

The invention provides a method for preventing and controlling damage of a corn herbicide to flue-cured tobacco, and relates to the technical field of flue-cured tobacco plant protection. The method comprises the following steps: S1, spraying a Bordeaux mixture twice after wheat harvesting and summer corn seedling emergence respectively; s2, in the flue-cured tobacco resettling stage, chitin, seaweed fish protein and bacillus subtillis are applied in a drip irrigation mode in combination with irrigation of vigorous growth water; s3, in the squaring stage of the flue-cured tobacco, chitin seaweed fish protein and bacillus subtillis are applied in combination with flat-top water irrigation and drip irrigation; s4, spraying Yunlei in the vigorous growth period of the flue-cured tobaccos. The method focuses on prevention, conforms to the agricultural prevention and control principle, is accurate in prevention and control time, covers the most critical periods of the flue-cured tobacco forming yield and quality, is remarkable in effect, and can effectively reduce the incidence rate and improve the flue-cured tobacco yield and value.

Description

Technical Field

[0001] The present invention relates to the technical field of flue-cured tobacco plant protection, and particularly relates to a prevention and control method for the harm of corn herbicides to flue-cured tobacco. Background Technique

[0002] During the process of corn planting, pests, diseases and weeds are often encountered. If effective prevention and pest control are not carried out, it will cause poor harvest and reduced yield. For the prevention and control of corn, people usually use a large amount of chemical herbicides for prevention and control. Commonly used chemical herbicides include amide-based, triazine-based, etc. Moreover, in order to obtain better effects, several herbicides are often mixed and used in actual use. During the actual application of chemical herbicides, they not only act on the applied crops, but the fog droplets formed during spraying will also cause phytotoxicity to the crops in adjacent fields. In the vast dry-cultivated tobacco-growing areas of our country, there is often a phenomenon of alternating planting in adjacent plots in the same season. Flue-cured tobacco is generally sown in March, transplanted in May, and harvested by the end of October; summer corn is sown in June and harvested from the end of September to October; the application period of corn herbicides covers the rosette stage, vigorous growth stage and flat top stage of flue-cured tobacco, and this time period is exactly the most critical time for flue-cured tobacco to form yield, quality and economic benefits. The large use of corn herbicides often causes serious damage to the tobacco plants in adjacent tobacco fields. In the light case, diseases such as angular leaf spot, wildfire disease, or brown spot, frog eye disease, etc. will appear. In the severe case, wilting, browning will occur until the stems and leaves fall off and die.

[0003] In the current literature on the prevention and control methods for the harm of corn herbicides to flue-cured tobacco, Wang Gang et al. (in "Phytotoxicity of Herbicides in Corn Fields to Flue-Cured Tobacco", Tobacco Science & Technology, 2019, 52(01): 15-21) used the main cultivated flue-cured tobacco varieties as test materials to conduct a phytotoxicity test on commonly used corn field herbicides, calculate the phytotoxicity index and phytotoxicity plant rate, so as to screen the commonly used corn field herbicides that are relatively safe for the main cultivated flue-cured tobacco varieties, but did not involve the specific methods for preventing and controlling the harm of corn herbicides.

[0004] In the study on the impact of corn field herbicide drift on tobacco (Chinese Academy of Agricultural Sciences, 2019), it was comprehensively analyzed that the degrees of alleviating the phytotoxicity of 'clodinafop-propargyl and atrazine' by brassinolide, gibberellic acid and Zhiliyuan were different, and the preventive effect before spraying was better than that later. It was demonstrated that brassinolide, etc. could alleviate the phytotoxicity of 2 herbicide varieties, and its results only played a role in alleviating, but did not propose a set of specific solutions or methods.

[0005] Chinese Patent CN105940808A discloses a method for repairing the phytotoxicity of tobacco caused by quinclorac herbicide. This method combines the three-dimensional fallow tillage technology with bamboo charcoal and distiller's grains fertilizer, loosening the soil by replacing soil layers, supplementing the nutrients required for tobacco growth, and removing exogenous toxic substances in the crop body. This method is aimed at the phytotoxicity of tobacco fields caused by the residue of quinclorac herbicides in the tobacco field soil in the tobacco-rice rotation area, but it cannot solve the phytotoxicity of corn herbicides to flue-cured tobacco.

[0006] In addition, in recent years, the phenomenon of herbicide damage to tobacco leaves has occurred frequently. Therefore, developing a complete prevention and control method for the damage of corn herbicides to flue-cured tobacco is an urgent problem to be solved in current tobacco production. Summary of the Invention

[0007] The purpose of the present invention is to provide a prevention and control method for the damage of corn herbicides to flue-cured tobacco in view of the deficiencies of the prior art. This method focuses on prevention, conforms to the principle of agricultural control, has accurate prevention and control time, covers the most critical periods for the formation of yield and quality of flue-cured tobacco, and has remarkable prevention and control effects.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0009] A prevention and control method for the damage of corn herbicides to flue-cured tobacco, comprising the following steps:

[0010] S1. Spray Bordeaux mixture twice respectively after the wheat harvest and after the emergence of summer corn;

[0011] S2. During the rosette stage of flue-cured tobacco, chitosan seaweed fish protein and Bacillus subtilis are drip-irrigated in combination with watering for strong growth;

[0012] S3. During the budding stage of flue-cured tobacco, chitosan seaweed fish protein and Bacillus subtilis are drip-irrigated in combination with watering for flat topping;

[0013] S4. Spray Yunleshou during the strong growth stage of flue-cured tobacco.

[0014] Further, in step S1, the application amount of the Bordeaux mixture is 50-60 g / mu.

[0015] Further, in step S1, the Bordeaux mixture is sprayed each time on sunny days from 9 am to 4 pm.

[0016] Currently, the common way to deal with herbicide damage is to spray plant growth regulators for remediation after the occurrence of herbicide damage, and this method has poor effects. While this application conducts prevention and control in advance before the occurrence of herbicide damage, which can prevent the damage of herbicides.

[0017] Further, in step S1, the time interval between the two sprays of the Bordeaux mixture is at least 15 days, preferably 15-20 days.

[0018] Bordeaux mixture is a broad-spectrum fungicide. After spraying, it is sky-blue and slightly sticky, forming a protective film on the leaf surface to protect against pathogenic bacteria. When spraying, choose to spray the tobacco leaves from 9 am to 4 pm. At this time, there is no fog or water droplets on the leaves, which is more conducive to the formation of a protective film of Bordeaux mixture on the leaf surface, thus playing a good protective role. It can not only protect the tobacco leaves from pests, but also prevent the contact between corn herbicide and tobacco leaves, reducing the phytotoxicity to tobacco leaves. And the interval between two applications of Bordeaux mixture is at least 15 days, which can play a better protective role to a greater extent and will not cause waste.

[0019] Further, in step S2 and step S3, the application amount of the chitin seaweed fish protein is 0.5 - 4 kg / mu. For example, it can be 0.5 kg / mu, 0.6 kg / mu, 0.7 kg / mu, 0.8 kg / mu, 0.9 kg / mu, 1.0 kg / mu, 1.5 kg / mu, 2.0 kg / mu, 2.5 kg / mu, 3 kg / mu, 4 kg / mu or any range therebetween; preferably it is 2.5 kg / mu.

[0020] Chitin seaweed fish protein is a natural fertilizer rich in various nutrients such as organic matter, fish protein, and polypeptides. In the present invention, chitin seaweed fish protein is applied in combination with irrigation during the rosette stage and budding stage, which can supplement comprehensive nutrition, improve nutritional resistance, and improve the problem of the deteriorated quality of flue-cured tobacco after spraying corn herbicide, thereby improving the quality of flue-cured tobacco and enhancing the baking characteristics. In addition, chitin seaweed fish protein is an extract of seaweed, which is more easily absorbed and transformed on tobacco crops and has a lower price. Therefore, it has an unparalleled application prospect in tobacco crops.

[0021] Further, in step S2 and step S3, the application amount of the Bacillus subtilis is 0.1 - 2.0 kg / mu. For example, it can be 0.1 kg / mu, 0.2 kg / mu, 0.3 kg / mu, 0.4 kg / mu, 0.5 kg / mu, 0.6 kg / mu, 0.7 kg / mu, 0.8 kg / mu, 0.9 kg / mu, 1.0 kg / mu, 1.5 kg / mu, 2.0 kg / mu or any range therebetween; preferably it is 1.0 kg / mu.

[0022] Bacillus subtilis is a Gram-positive bacterium, which can utilize proteins, polysaccharides, and starches, etc., decompose them into indole acetic acid to promote the rapid growth of crops; it can inhibit the growth and reproduction of pathogenic bacteria and protect the roots of crops from being invaded; it has the function of decomposing phosphorus, can decompose and transform solid phosphorus in the soil, promote root growth, and improve resistance; it can purify and repair the soil, and improve the yield and quality of crops. In the present invention, Bacillus subtilis is applied in combination with irrigation during the rosette stage and budding stage to promote root growth and improve resistance.

[0023] Furthermore, applying chitin seaweed fish protein and Bacillus subtilis simultaneously during the rosette stage and budding stage helps improve the prevention and control effect compared to separate application. The application method is as follows: First, drip irrigate clear water for 1 hour using the drip irrigation method; then connect the fertilizer tank and apply chitin seaweed fish protein and Bacillus subtilis, and drip irrigate for 3 hours; finally, remove the fertilizer tank and then drip irrigate clear water for 1 hour.

[0024] Furthermore, in step S4, the application amount of Yunleshou is 10 - 120 ml / mu. For example, it can be 10 ml / mu, 11 ml / mu, 12 ml / mu, 13 ml / mu, 14 ml / mu, 15 ml / mu, 16 ml / mu, 17 ml / mu, 18 ml / mu, 19 ml / mu, 20 ml / mu, 30 ml / mu, 40 ml / mu, 50 ml / mu, 60 ml / mu, 70 ml / mu, 80 ml / mu, 90 ml / mu, 100 ml / mu, 110 ml / mu, 120 ml / mu, 130 ml / mu, 140 ml / mu, 150 ml / mu, 160 ml / mu; preferably 60 ml / mu.

[0025] Yunleshou is both a plant growth regulator and a broad-spectrum fungicide, containing brassinolide, pyraclostrobin, and various nutrient elements such as phosphorus, potassium, zinc, nitrogen, and chitosan. Applying Yunleshou during the vigorous growth period in the present invention can promote root growth, enhance the driving force, strengthen the resistance of flue-cured tobacco, and improve the adverse symptoms caused by diseases and phytotoxicities. Currently, plant growth regulators such as gibberellic acid (commonly known as 920), Plant Power 2003, etc. After using gibberellic acid, the appearance of the tobacco leaves changes, and the leaf shape becomes long and narrow; after using Plant Power 2003, the leaf shape becomes wide and round. Generally, tobacco is graded and priced through methods such as manual visual inspection, touch, and smell, such as maturity, identity, oil content, leaf structure, etc. The leaf shape is one of the factors for determining the grade and affects its price. Using Yunleshou in this application, compared with other plant growth regulators, it will not affect the appearance shape of flue-cured tobacco leaves, and thus will not affect its grading and pricing due to changes in quality such as appearance shape.

[0026] Furthermore, when the prevention and control of flue-cured tobacco damaged by the above-mentioned corn herbicide still suffers serious damage from the herbicide, the method of cultivating side shoots is used for remedy.

[0027] Even further, the method of cultivating side shoots is as follows: Remove all the leaves at 2 leaf positions counting down from the damaged part, and then start cultivating side shoots from the next 2 leaf positions below.

[0028] Even further, during the process of cultivating side shoots, it is necessary to retain the strong axillary buds in the side shoots and remove the remaining axillary buds; it is also necessary to do a good job in pest and disease control, especially the damage caused by tobacco budworms and aphids.

[0029] Optionally, the pest control is the conventional pest control in the process of flue-cured tobacco planting, without special limitation.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention provides a prevention and control method for the harm of corn herbicides to flue-cured tobacco. This method focuses on prevention, conforms to the principle of agricultural control, has precise prevention and control time, covers the most critical periods for the formation of yield and quality of flue-cured tobacco, and the prevention and control method has remarkable effects, can effectively reduce the incidence rate, and increase the yield and output value.

[0032] 2. After the wheat harvest is over and the summer corn emerges, the present invention sprays Bordeaux mixture on the flue-cured tobacco twice. The Bordeaux mixture forms a protective film on the surface of the tobacco leaves, which can not only protect the tobacco leaves from insect pests, but also prevent the contact between the corn herbicide and the tobacco leaves, reducing the phytotoxicity to the tobacco leaves.

[0033] 3. During the rosette stage and budding stage of flue-cured tobacco, the present invention applies chitin seaweed fish protein and Bacillus subtilis in combination with irrigation, which can supplement comprehensive nutrition, promote the growth of flue-cured tobacco, improve nutritional resistance, promote root growth and improve resistance.

[0034] 4. During the vigorous growth period, the present invention sprays Yunleshou, which can promote root growth, improve the driving force, enhance the resistance of flue-cured tobacco, and improve the adverse symptoms caused by diseases and phytotoxicity.

[0035] 5. When the tobacco leaves are severely damaged by herbicides, the present invention cultivates tiller tobacco for remedy to cope with emergencies and provide comprehensive protection. Description of the Drawings

[0036] Figure 1 is a picture of the core leaves damaged by herbicides in Example 8;

[0037] Figure 2 is a picture of the middle leaves damaged by herbicides in Example 8;

[0038] Figure 3 is a picture of the overall field damaged by herbicides in Example 8;

[0039] Figure 4 is a picture of the successful cultivation of tiller tobacco in the overall field damaged by herbicides in Example 8;

[0040] Figure 5 is a picture of the successful cultivation of tiller tobacco on the tobacco plants damaged by herbicides in Example 8. Detailed Embodiments

[0041] The following non-limiting examples can enable those of ordinary skill in the art to more comprehensively understand the present invention, but do not limit the present invention in any way. The following content is merely an exemplary illustration of the scope claimed by the present invention. Those skilled in the art can make various changes and modifications to the invention according to the disclosed content, and they should also fall within the scope claimed by the present invention.

[0042] In the present invention, unless otherwise specified, the remaining steps are all conventional steps in the flue-cured tobacco planting process, such as seedling raising, transplanting, fertilizing and watering, pest and disease control, topping and suckering, mature picking, etc. These steps can be carried out according to general farming practices without special limitations, nor do they constitute a limitation to this application.

[0043] In the specific embodiments of the present invention, the Bacillus subtilis is Bacillus subtilis CICC 10071), which is purchased from the China Center for Industrial Culture Collection. The Bordeaux mixture uses a commercially available Bordeaux mixture (Tongzhou Zhengda Pesticide and Chemical Industry Co., Ltd., with an active ingredient content of 80%, wettable powder), at a dilution of 500 - 600 times. The Bordeaux mixture can also be self-prepared using copper sulfate pentahydrate, quicklime, and water in a mass ratio of 1:1:1600 - 200; the chitin seaweed fish protein is purchased from Haifa (China) Chemical Group Co., Ltd. in Israel; the Yunle is purchased from Zhengzhou Lüyeyuan Agricultural Science and Technology Co., Ltd. Other chemical reagents are obtained through conventional commercial channels unless otherwise specified.

[0044] The following combines the field trials of tobacco to verify the effectiveness of the method for preventing and controlling the harm of corn herbicides to flue-cured tobacco in the present invention.

[0045] Example 1

[0046] A method for preventing and controlling the harm of corn herbicides to flue-cured tobacco, comprising the following steps:

[0047] S1. Spraying Bordeaux mixture: Spray 60 g / mu of Bordeaux mixture twice, respectively after the wheat harvest and after the summer corn emerges; when spraying each time, select sunny days from 9 am to 4 pm for spraying, and the time interval between the two sprays of Bordeaux mixture is 15 days;

[0048] S2. Applying chitin seaweed fish protein and Bacillus subtilis:

[0049] The first application: At the rosette stage of flue-cured tobacco, combine with watering the strong growth water and drip-irrigate chitin seaweed fish protein and Bacillus subtilis;

[0050] The second application: At the budding stage, combine with watering the flat-top water and drip-irrigate chitin seaweed fish protein and Bacillus subtilis;

[0051] During the two application processes, the application rate of chitin seaweed fish protein was 2.5 kg / mu each time, and the application rate of Bacillus subtilis was 1.0 kg / mu each time;

[0052] S3. Spraying Yunleshou: Spraying Yunleshou during the vigorous growth period, with an application rate of 60 ml / mu.

[0053] Example 2

[0054] A prevention and control method for the harm of corn herbicides to flue-cured tobacco, comprising the following steps:

[0055] S1. Spraying Bordeaux mixture: Spraying Bordeaux mixture at 50 g / mu twice, respectively after the wheat harvest and after the emergence of summer corn; When spraying each time, select to spray from 9 am to 4 pm on the same day, and the time interval between the two sprays of Bordeaux mixture is 20 days;

[0056] S2. Applying chitin seaweed fish protein and Bacillus subtilis:

[0057] The first application: During the rosette stage of flue-cured tobacco, chitin seaweed fish protein and Bacillus subtilis were drip-irrigated in combination with the irrigation of the vigorous growth water;

[0058] The second application: During the budding stage, chitin seaweed fish protein and Bacillus subtilis were drip-irrigated in combination with the irrigation of the flat-top water;

[0059] During the two application processes, the application rate of chitin seaweed fish protein was 0.5 kg / mu each time, and the application rate of Bacillus subtilis was 2.0 kg / mu each time;

[0060] S3. Spraying Yunleshou: Spraying Yunleshou during the vigorous growth period, with an application rate of 120 ml / mu.

[0061] Example 3

[0062] A prevention and control method for the harm of corn herbicides to flue-cured tobacco, comprising the following steps:

[0063] S1. Spraying Bordeaux mixture: Spraying Bordeaux mixture at 60 g / mu twice, respectively after the wheat harvest and after the emergence of summer corn; When spraying each time, select to spray from 9 am to 4 pm on a sunny day, and the time interval between the two sprays of Bordeaux mixture is 15 days;

[0064] S2. Applying chitin seaweed fish protein and Bacillus subtilis:

[0065] The first application: During the rosette stage of flue-cured tobacco, chitin seaweed fish protein and Bacillus subtilis were drip-irrigated in combination with the irrigation of the vigorous growth water;

[0066] The second application: During the budding stage, chitin seaweed fish protein and Bacillus subtilis were drip-irrigated in combination with the irrigation of the flat-top water;

[0067] During the two application processes, the application rate of chitin seaweed fish protein was 4 kg / mu each time, and the application rate of Bacillus subtilis was 0.1 kg / mu each time;

[0068] S3. Spraying Yunleshou: Yunleshou was sprayed during the vigorous growth period, and the application rate was 10 ml / mu.

[0069] Example 4

[0070] The difference from Example 1 is that in step S2, the application rate of chitin seaweed fish protein was 0.3 kg / mu.

[0071] Example 5

[0072] The difference from Example 1 is that in step S2, the application rate of chitin seaweed fish protein was 5 kg / mu.

[0073] Example 6

[0074] The difference from Example 1 is that in step S2, the application rate of Bacillus subtilis was 3 kg / mu.

[0075] Example 7

[0076] The difference from Example 1 is that in step S3, the application rate of Yunleshou was 5 ml / mu.

[0077] Example 8

[0078] The difference from Example 1 is that in step S3, the application rate of Yunleshou was 180 ml / mu.

[0079] Comparative Example 1

[0080] The difference from Example 1 is that the Bordeaux mixture in step S1 was replaced with an equal amount of mancozeb.

[0081] Comparative Example 2

[0082] The difference from Example 1 is that there was no step S1, that is, the Bordeaux mixture was not applied.

[0083] Comparative Example 3

[0084] The difference from Example 1 is that in step S2, only chitin seaweed fish protein was applied during the rosette stage and budding stage of flue-cured tobacco, and the application rate remained unchanged.

[0085] Comparative Example 4

[0086] The difference from Example 1 is that in step S2, only Bacillus subtilis was applied during the rosette stage and budding stage of flue-cured tobacco, and the application rate remained unchanged.

[0087] Comparative Example 5

[0088] The difference from Example 1 is that in step S2, chitin seaweed fish protein and Bacillus subtilis are applied only during the rosette stage of flue-cured tobacco, and the application amount remains unchanged.

[0089] Comparative Example 6

[0090] The difference from Example 1 is that in step S2, chitin seaweed fish protein and Bacillus subtilis are applied only during the budding stage of flue-cured tobacco, and the application amount remains unchanged.

[0091] Comparative Example 7

[0092] The difference from Example 1 is that there is no step S2, that is, chitin seaweed fish protein and Bacillus subtilis are not applied during the rosette stage and budding stage of flue-cured tobacco.

[0093] Comparative Example 8

[0094] The difference from Example 1 is that in step S3, Yunleshou is replaced by gibberellic acid.

[0095] Comparative Example 9

[0096] The difference from Example 1 is that there is no step S3, that is, Yunleshou is not sprayed during the vigorous growth stage.

[0097] Comparative Example 10

[0098] The difference from Example 1 is that no prevention and control is carried out, that is, this example is a conventional flue-cured tobacco planting.

[0099] Test Example 1

[0100] To verify the effect of the above prevention and control method, this application conducted tests in the tobacco field of Jiao Peilan in Dongtun Village, Zhugou Town. The results of the disease incidence of flue-cured tobacco are shown in Table 1 below. It can be seen that in Example 1, prevention and control were carried out during the planting of flue-cured tobacco, and the disease index and incidence of TMV, black shank of flue-cured tobacco were both 0. When no prevention and control was carried out (Comparative Example 9), the incidence was 5 times higher, and PVY, wildfire disease, and angular leaf spot were 2.9 times, 1.5 times, and 1.5 times respectively. The disease index and incidence of Example 1 were significantly lower than those of Comparative Example 9, indicating that the prevention and control method provided by the present invention can effectively reduce the incidence of flue-cured tobacco and reduce the harm of corn herbicide to flue-cured tobacco.

[0101] Table 1. Incidence

[0102]

[0103]

[0104] Table 2 shows the results of the yield and output value of flue-cured tobacco. As shown in the table, prevention and control were carried out in Example 1, while the conventional flue-cured tobacco planting method without prevention and control was used in Comparative Example 9. Compared with Comparative Example 9, although the yield per mu only increased by 7 kg in Example 1, the proportion of superior-grade tobacco increased by nearly 30%, the average price was about 5 yuan / mu higher, and the output value was nearly 1,200 yuan / mu higher (note that the output value does not include out-of-price subsidies). It can be seen that the prevention and control method provided by the present invention can effectively improve the product quality of flue-cured tobacco and increase the output value.

[0105] Table 2. Yield and Output Value of Flue-cured Tobacco

[0106]

[0107]

[0108] Example 8

[0109] If the flue-cured tobacco leaves have been severely damaged by herbicides, the flue-cured tobacco can be remedied by cultivating lateral shoots. The method is as follows: All the leaves at two leaf positions counted downward from the damaged part are removed, and then lateral shoots are cultivated starting from the next two leaf positions below. During the cultivation of lateral shoots, the strong axillary buds in the lateral shoots should be retained, and the rest of the axillary buds should be removed; pest and disease control should also be done well, especially the damage caused by tobacco budworms and aphids. The pest and disease control is carried out according to the method in the conventional flue-cured tobacco planting process.

[0110] To investigate the effect of the remedial method when the flue-cured tobacco leaves have been severely damaged by herbicides, this application conducted an experiment in the tobacco field of Li Zongxiang in Hedong Village, Zhugou Town. The leaves in this tobacco field were damaged by herbicides. Among them, the pictures of the core leaves ( Figure 1 ), middle leaves ( Figure 2 ), and the overall picture of the field ( Figure 3 ) Figure 2 In the picture, the brown damaged part in the middle, the lower part will crack and fall off during development, resulting in incomplete tobacco leaves, seriously affecting its yield and quality. Figure 3 The overall field is chlorotic in the picture; the cultivation of lateral shoots is carried out for remedial measures according to the method provided in Example 8, and no remedial measures are used as a comparison.

[0111] Figure 4 、 Figure 5 The overall picture of the field and the picture of a single plant showing the successful cultivation of lateral shoots for tobacco plants severely damaged by herbicides. The remedial effect of the above method was evaluated according to the yield and output value of flue-cured tobacco. The results are shown in Table 3 below. It can be seen that when the flue-cured tobacco leaves have been severely damaged by herbicides, the yield per mu is 41 kg, and there is no superior-grade tobacco in the produced tobacco leaves, and the output value is less than 1,000 yuan. However, after remedial measures by cultivating lateral shoots, the yield increased by more than 3 times, and the output value was nearly 4 times.

[0112] Table 3. Yield and Output Value of Flue-cured Tobacco

[0113] Group Yield per mu (kg) Output value per mu (yuan) Average price (yuan) Proportion of top-grade tobacco (%) Remedy 135.25 3944.92 29.17 62.12 No remedy 41 902 22 0

[0114] The above description of the embodiments is provided to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and all improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A method for preventing and controlling corn herbicides from harming flue-cured tobacco, characterized in that: The following steps are involved: S1, spray Bordeaux liquid twice, after wheat harvest and after summer corn seedlings emerge; S2. Apply chitosan, seaweed, fish protein and Bacillus subtilis during the tobacco bush stage by drip irrigation; S3, chitosan, seaweed, fish protein and Bacillus subtilis were applied in combination with flat-top drip irrigation during the flue-cured tobacco budding period; S4. Spray Yun Le Shou during the peak period of flue-cured tobacco.

2. The method for preventing and controlling corn herbicide damage to flue-cured tobacco according to claim 1, characterized in that: In step S1, the application amount of the Bordeaux mixture is 50-60 g / mu.

3. The method for preventing and controlling corn herbicide damage to flue-cured tobacco according to claim 1, characterized in that: In step S1, the time interval between the two sprayings of Bordeaux mixture is at least 15 days, preferably 15 to 20 days.

4. The method for preventing and controlling corn herbicide damage to flue-cured tobacco according to claim 1, characterized in that: In step S2 and step S3, the amount of chitosan seaweed fish protein applied is 0.5-4 kg / mu.

5. The method for preventing and controlling corn herbicide damage to flue-cured tobacco according to claim 1, characterized in that: In step S2 and step S3, the application amount of the Bacillus subtilis is 0.1-2.0 kg / mu.

6. The method for preventing and controlling corn herbicide damage to flue-cured tobacco according to claim 1, characterized in that: In step S2 and step S3, chitin seaweed fish protein and Bacillus subtilis are applied simultaneously at the clustering stage and the budding stage, and the application method is: first drip irrigation with clean water for 1 hour; then connect the fertilizer tank, add chitin seaweed fish protein and Bacillus subtilis, and drip irrigation for 3 hours; finally remove the fertilizer tank and drip irrigation with clean water for 1 hour.

7. The method for preventing and controlling corn herbicide damage to flue-cured tobacco according to claim 1, characterized in that: In step S4, the application amount of the Yunleshou is 10-120 ml / mu.

8. The method for preventing and controlling corn herbicides from harming flue-cured tobacco according to any one of claims 1 to 7, characterized in that: When the flue-cured tobacco leaves are still seriously damaged by the herbicide after being controlled by the corn herbicide control method for flue-cured tobacco as described in any one of claims 1 to 7, a method of cultivating forked tobacco is used for remediation.

9. The method for preventing and controlling corn herbicide damage to flue-cured tobacco according to claim 8, characterized in that: The method for cultivating forked tobacco is as follows: all leaves 2 positions below the damaged part are removed, and then forked tobacco is cultivated from the next 2 leaves.

10. The method for preventing and controlling corn herbicide damage to flue-cured tobacco according to claim 9, characterized in that: During the process of cultivating forked tobacco, it is necessary to retain the strong axillary buds in the forked tobacco and remove the other axillary buds; it is also necessary to do a good job in disease and insect pest control, especially tobacco budworm and aphid infestation.

Images