A tobacco leaf field monitoring method for tobacco leaves of multiple varieties and regions before collecting appearance images

Abstract

The present invention provides a tobacco field monitoring method for collecting tobacco leaf appearance images of multiple varieties and regions. The method can achieve precise control of the field growth stage of tobacco leaves of different regions and varieties by regularly arranging special personnel to measure relevant physical properties and sample fixed leaves, explore the relationship between different tobacco leaf lengths, different green content, different areas containing variegated colors and tobacco leaf quality in different growth periods, improve the accuracy of tobacco samples, prevent tobacco leaf mixing, promote the development of tobacco leaf appearance image collection, and improve the accuracy, standardization and rigor of the appearance quality evaluation standard system.

Description

Technical Field

[0001] The present invention relates to the field of agricultural management technology, and more specifically to a tobacco field monitoring method used before collecting appearance images of tobacco leaves of multiple varieties and regions. Background Art

[0002] Tobacco cultivation has a long history and covers a wide area. Different production areas have many different varieties. These varieties differ in terms of growth environment, cultivation techniques, tobacco leaf quality, etc. At the same time, natural conditions such as climate, soil, and water in different regions have a significant impact on the growth and quality of tobacco. Therefore, tobacco cultivation and production show obvious regional characteristics around the world. Due to regional differences, tobacco cultivation techniques and management methods in different regions are also different.

[0003] The field growth period of tobacco can usually be divided into several stages: seedling stage, rooting stage, vigorous growth stage and maturity stage.

[0004] The seedling recovery period refers to the period from transplanting to survival, which generally lasts 7 to 10 days. Transplanting with soil can shorten the seedling recovery period. If the temperature is low and rainy after transplanting, the seedling recovery period will be extended.

[0005] The root extension period, also known as the clustering period, refers to the period from when the tobacco seedlings are transplanted to the field, when the plant height reaches 30-35 cm, 12-16 leaves are unfolded (depending on the variety), the tobacco leaves grow naturally horizontally, the width is twice the plant height, the two heart leaves stand up close together, and the whole plant is in a flat spherical shape. The root extension period is the peak period of root growth after the tobacco seedlings are transplanted to the field. During this period, the underground part grows faster than the aboveground part, lateral roots and fine roots occur in large numbers, and the root dry weight and volume increase rapidly.

[0006] The vigorous growth period refers to the period from the plant clustering to the appearance of flower buds on the top of the main stem, which is 25 to 30 days. During the vigorous growth period, the main growth is vegetative growth. At the same time, flower buds begin to differentiate, lateral roots and fine roots continue to grow, and adventitious roots appear in large numbers. When buds appear, the root system volume reaches its maximum value, and the stems elongate rapidly. At a height of 35 to 70 cm from the ground, the leaves are large and overlapped, spreading out into a trumpet shape. From flower bud differentiation to bud appearance, the number of leaves on the plant is fixed.

[0007] The maturity period refers to the period from the appearance of tobacco buds to the end of leaf harvesting. After the appearance of tobacco buds, the lower leaves of the tobacco plant gradually age, and the leaves gradually turn yellow and mature from bottom to top. After the appearance of buds, the tobacco plant switches from vegetative growth to reproductive growth.

[0008] Although there are specific evaluation criteria for the four growth periods of tobacco in the field stage, in the existing tobacco cultivation experiments involving multiple varieties and multiple regions, due to regional differences and differences in growth periods, farmers mainly rely on subjective experience to determine the growth period of tobacco and carry out agronomic measures such as topping and removing base leaves. Experimenters are unable to accurately track and regulate the growth of each region and variety. Therefore, there is a lack of a complete set of tobacco field management methods in tobacco experiments involving multiple varieties and multiple regions.

[0009] In addition, tobacco leaf grading also plays a vital role in the tobacco industry. Through grading, tobacco leaves of different qualities can be distinguished to ensure that high-quality tobacco leaves are used in the production of high-end tobacco products, thereby improving the quality of the entire tobacco product. At the same time, it helps to reasonably allocate and utilize tobacco leaf resources. Tobacco leaves of different grades can be used for different types of tobacco products, so that each tobacco leaf can be used in the most suitable application, improving the efficiency of resource utilization. Graded tobacco leaves are easier to trade in the market. Standardized grade division enables buyers and sellers to more accurately assess the value of tobacco leaves and promotes fair transactions in the market. In the tobacco production process, graded tobacco leaves are more convenient for subsequent processing and treatment. For example, in cigarette production, tobacco leaves of different grades can be mixed according to specific formulas to achieve ideal taste and aroma, etc. In summary, tobacco leaf grading plays an important role in improving the quality of tobacco products, optimizing resource utilization, promoting market transactions, facilitating production management, and protecting consumer rights.

[0010] However, the current evaluation process for tobacco leaf grades is cumbersome, and the evaluation indicators mainly include appearance quality, intrinsic quality, and physical and chemical indicators. Appearance quality includes color, maturity, texture, leaf structure, degree of loss, etc., while intrinsic quality and physical and chemical indicators include chemical composition analysis, physical property determination, and sensory quality evaluation. Compared with intrinsic quality and physical and chemical indicators, evaluating tobacco leaf quality grades by appearance quality is intuitive and rapid, does not require complex instruments and equipment, is easy to operate and understand, and can be used to preliminarily screen and classify a large number of tobacco leaves in a short period of time, thereby improving the efficiency of tobacco leaf acquisition and processing. At the same time, the appearance characteristics of tobacco leaves are often closely related to their intrinsic quality. For example, appearance indicators such as color, maturity, and oil content of tobacco leaves can reflect their chemical composition and sensory quality to a certain extent.

[0011] With the rapid development of computer technology and image processing technology, tobacco leaf image acquisition technology has been widely used in the tobacco industry. It uses digital image technology and machine vision technology to capture and record the appearance characteristics of tobacco leaves with high precision. The application range of tobacco leaf image acquisition technology is wide, including tobacco leaf grading, quality inspection, pest and disease control and other aspects. Through image acquisition technology, it is possible to quickly and accurately identify and analyze the appearance characteristics of tobacco leaves, provide strong technical support for tobacco production and processing, and provide a scientific basis for tobacco leaf grading and quality evaluation.

[0012] In order to achieve rapid and accurate identification and analysis of the appearance characteristics of tobacco leaves through image acquisition technology, it is necessary to measure agronomic traits, evaluate appearance quality characteristics, and analyze physical properties and chemical composition of tobacco leaves from different regions, varieties, and growth stages, find out the variation patterns of the physical properties, chemical composition, and sensory quality of the corresponding tobacco leaves in different production areas or varieties, study the correlation and differences between the appearance quality characteristics of tobacco leaves and their physical properties, chemical composition, and sensory quality, and finally scan and collect tobacco leaf samples to construct a standard system for appearance quality evaluation.

[0013] To conduct research on the impact of a single tobacco leaf appearance factor on tobacco leaf quality, it is necessary to explore the relationship between different tobacco leaf lengths, different green content, different variegated areas and tobacco leaf quality at different growth stages. However, in the existing tobacco leaf cultivation process, there is a lack of accurate control over the growth of tobacco leaves from different regions and varieties, as well as the determination of agronomic traits at different growth stages. At the same time, when tobacco leaf experiments involve multiple regions and multiple varieties, due to the regionality of tobacco leaf growth and the large number of samples, tobacco leaves are often mixed, making it impossible to accurately distinguish between tobacco leaves from different regions and varieties, thus affecting the accuracy of tobacco leaf image acquisition and the construction of an appearance quality evaluation standard system.

[0014] In summary, in order to better complete the scanning and collection of tobacco leaf samples and build a standard system for appearance quality evaluation, and carry out research on the impact of single tobacco leaf appearance factors on tobacco leaf quality, it is necessary to form a complete and popularizable tobacco leaf field monitoring method during the field growth stage of tobacco leaves, and measure the agronomic traits of tobacco leaves from different regions, varieties, and growth periods. Find out the change patterns of the production areas or varieties of the corresponding tobacco leaves in terms of physical properties, chemical composition, and sensory quality, and study the correlation and differences between the appearance quality characteristics of tobacco leaves and their physical properties, chemical composition, and sensory quality. Summary of the invention

[0015] In view of this, in order to meet the needs of tobacco leaf appearance quality characteristics and image digital representation research and to address the problems or defects of existing tobacco leaf cultivation and management methods, the present invention provides a tobacco leaf field monitoring method for multiple varieties and regions before collecting tobacco leaf appearance images. This method achieves precise control of the field growth stage of tobacco leaves of different regions and varieties by regularly arranging special personnel to measure relevant physical properties and sample fixed leaves, explores the relationship between different tobacco leaf lengths, different green content, and different areas containing variegated colors and tobacco leaf quality in different growth periods, and at the same time improves the accuracy of tobacco samples, prevents tobacco leaf mixing, promotes the development of tobacco leaf appearance image collection, and improves the accuracy, standardization and rigor of the appearance quality evaluation standard system.

[0016] In order to achieve the above object, the present invention adopts the following technical solution:

[0017] A tobacco leaf field monitoring method for collecting tobacco leaf appearance images of multiple varieties and regions, comprising the following steps:

[0018] 1. Variety selection:

[0019] Investigate the ecological conditions of the test area, such as climate, light and soil, and select tobacco varieties that are suitable for the local ecological environment to prevent the normal growth of tobacco from being affected by differences in the living environment between varieties;

[0020] 2. Soil preparation:

[0021] Conduct field surveys on the soil to ensure that it is suitable for tobacco growth. The soil must be loamy, with medium to high fertility, good light conditions, convenient transportation, and easy irrigation. The field must also have uniform fertility, no serious pests and diseases, and the area must not be less than 1 mu;

[0022] 3. Monitoring personnel determine:

[0023] Carry out test tracking and implementation management according to the "2+1+N" team deployment model;

[0024] 4. Unified management:

[0025] The experimental varieties were sown on the same day in the same nursery, and were managed and transplanted in a unified manner, with a shortened transplanting interval. Water was poured while transplanting to ensure the survival rate of the transplanted varieties.

[0026] 5. Field data collection:

[0027] Field data is collected by a dedicated person, and records are kept at fixed times, fixed points, and fixed rows. Both data and image data are stored, and a dedicated U disk is used to ensure data integrity.

[0028] 6. Blade marking:

[0029] After the tobacco leaves are toppled and the foot leaves are removed, the leaves on the tobacco plants are marked with tags. The tags are hung on the petioles and tightened to ensure that they do not fall off.

[0030] Marking the leaves can improve the accuracy of tobacco samples during sampling and prevent tobacco leaf mixing;

[0031] 7. Special person for picking and roasting:

[0032] When the tobacco leaves are mature, special personnel are assigned to harvest them according to the leaf positions marked on the label. The number of leaves harvested and roasted for each plant is the same each time. At the same time, the tobacco leaves harvested each time are classified according to the leaf positions and individually organized into poles before being roasted.

[0033] 8. Classification and preservation:

[0034] After the tobacco leaves are baked, they are classified and stored in the order of the leaf positions marked on the labels. The same leaf positions of the same variety are bundled, weighed, and packaged with kraft paper and sample bags for the later collection of tobacco leaf appearance images.

[0035] Preferably, the "2+1+N" in step 3 specifically includes:

[0036] “2” refers to the project leader and implementation personnel of the pilot site, who are the main body of pilot promotion and implementation;

[0037] "1" is the person in charge of technical tracking and implementation. A responsible and dedicated tobacco farmer cultivator is selected to be responsible for tracking and guiding the experimental farmers to implement agricultural operations and experimental plan requirements throughout the process;

[0038] Hire “N” workers with standard agricultural operation and high cooperation degree to be responsible for the implementation of various experimental operation tasks.

[0039] Preferably, the unified management in step 4 specifically includes:

[0040] Formulate and implement different fertilization plans for different varieties, adhere to the cultivation direction of medium-sized tobacco, strictly implement the package fertilization, apply fertilizer scientifically, strictly control the average nitrogen application per mu, and prevent excessive and excessive application of fertilizers outside the package;

[0041] Manage the experimental fields in accordance with standardized agricultural operation requirements to fully demonstrate the characteristics of the varieties and reduce experimental errors.

[0042] Preferably, in the field data collection described in step 5, data collection is performed from the day of transplanting, with a period of 10 days, recording the number of leaves, plant height, disease conditions, pesticide spraying conditions, weather conditions, and growth conditions of surrounding tobacco plants until the topping is completed;

[0043] During harvesting and curing, the field conditions of tobacco plants before harvesting and curing, the agronomic shape of the harvested and cured leaves, curing on braided poles, and the quality of the tobacco leaves after curing are recorded, including:

[0044] (1) Growth period survey: record the entire growth period of tobacco plants, including sowing, transplanting, returning to seedlings, root extension, vigorous growth, and maturity;

[0045] (2) Investigation of the main agronomic shapes of tobacco leaves: After the tobacco leaves matured, 10 plants of each variety were selected to measure plant height, number of effective leaves, stem girth, internode distance, length and width of the largest waist leaf, length and width of the inverted third leaf, and plant spacing. The length was measured from the junction of the stem and leaves to the tip of the leaf, and the width was based on the widest point;

[0046] (3) Field management survey: record tobacco plant growth, field fertilization, and drug management, and keep records;

[0047] (4) Image collection: Set up signboards in the experimental field and collect images at fixed points, taking photos of the growth and appearance of individual tobacco plants and individual rows at different growth stages;

[0048] Accurate records of the field growth conditions of tobacco leaves of different regions and varieties will help explore the relationship between different tobacco leaf lengths, different green content, and different areas of variegated colors at different growth stages and tobacco leaf quality.

[0049] It can be seen from the above technical solution that compared with the prior art, the present invention has the following beneficial effects:

[0050] The present invention can ensure that the tobacco leaf field monitoring procedure before the tobacco leaf appearance image is collected is complete and standardized. In the tobacco leaf appearance test involving multiple varieties and regions, the growth conditions of tobacco leaves in different regions, varieties, strains, grades and leaf positions can be accurately located to facilitate the traceability of subsequent samples. The accuracy of tobacco leaf sampling can be greatly improved, thereby improving the accuracy of tobacco samples, preventing tobacco leaf mixing, promoting the development of tobacco leaf appearance image collection, and improving the accuracy, standardization and rigor of the appearance quality evaluation standard system. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0052] Figure 1 This is a flow chart of field monitoring of the present invention. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] Example 1

[0055] This example studies the implementation plan for the Shaoyang test site based on the appearance characteristics and image digital representation of tobacco leaves produced in Hunan in 2024.

[0056] 1. Variety selection

[0057] Through investigation of ecological conditions such as climate, light and soil in Shaoyang area, three experimental varieties, Yunyan 87, K326 and Xiangyan 7, were planted at the Shaoyang test site. The test area for each variety must not be less than 1 mu, and the planting scale of a single variety is 16-20 mu.

[0058] 2. Soil preparation

[0059] According to the project plan of "Study on the Appearance Characteristics and Digital Image Representation of Tobacco Leaves Produced in Hunan", the altitude of the Shaoyang test site is required to be about 450 meters. After field survey, the test site is located in Anyang Village, Yidushui Town, Xinning County. In order to ensure the effect of the test, two test sites are set up according to one main and one backup (one backup site is selected in Longhui County). The test field is required to be 450 meters above sea level, with loam soil, medium to high fertility, tobacco-rice rotation field, good light conditions, convenient transportation, convenient irrigation, uniform fertility of the field, no Solanaceae crops planted in the previous year, and no serious diseases and insect pests. The fixed observation area for each variety shall not be less than 1 mu.

[0060] 3. Determination of monitoring personnel

[0061] The test project tracking and implementation management is carried out according to the "2+1+N" team configuration model. "2" refers to the project leader and implementation personnel of the Shaoyang test site, who are the main body of the test promotion and implementation and are responsible for the overall implementation of the project. "1" is the person in charge of technical tracking and implementation. A responsible and dedicated tobacco farmer cultivator is selected to track and guide the test farmers to implement the agricultural operations and test plan requirements throughout the process. "N" workers with high agricultural operation standards and high cooperation are hired to be responsible for the implementation of various test operation tasks.

[0062] 4. Unified management

[0063] Before the end of December, the three varieties (Yunyan 87, Xiangyan No. 7, K326) will be sown on the same day in the same nursery and managed in a unified manner. The site selection of tobacco fields will be completed before February 10. The three varieties will be basically transplanted by the end of March. Try to transplant them uniformly, shorten the transplanting time interval, and water them while transplanting to ensure the survival rate of transplanting. The test field management should be carried out in accordance with the requirements of standardized agricultural operations, and the characteristics of the varieties should be fully expressed as much as possible to reduce the test error. Fertilization should be carried out in accordance with the package fertilization plan of the three varieties, adhere to the direction of medium-sized tobacco cultivation, strictly implement the package fertilization, apply fertilizer scientifically, strictly control the average nitrogen application per mu to not exceed 9.5KG, and eliminate excessive and excessive application of fertilizers outside the package. Tobacco fields with normal growth and development of tobacco plants, good upper tobacco leaf opening, and good fresh tobacco layering and yellowing should be selected as fixed-point observation fields for the experiment. Remove 4-5 leaves of unsuitable fresh tobacco from the bottom before tobacco leaves are harvested and roasted.

[0064] 5. Field data collection

[0065] Growth period survey: record the entire growth period of tobacco plants, including sowing, transplanting, returning seedlings, root extension, vigorous growth, and maturity.

[0066] Table 1 Records of the main growth periods in Shaoyang

[0067] Reproductive period Sowing period Transplanting period Seedling stage Rooting period Prosperity period Maturity time December 22 March 25 April 6 April 25 May 11 June 1

[0068] Survey of the main agronomic shapes of tobacco leaves: After the tobacco leaves mature, we selected 10 tobacco plants of each variety to measure their plant height, number of effective leaves, stem girth, internode distance, length and width of the largest waist leaf, length and width of the inverted trefoil leaf, and plant spacing. The length is measured from the junction of the stem and leaves to the tip of the leaf, and the width is based on the widest point. Related charts (taking Yunyan 87 as an example):

[0069] Table 2 Field agronomic characteristics record of Shaoyang Yunyan 87

[0070]

[0071] Field management survey: Investigate tobacco plant growth, field fertilization, and drug management, and keep records. Related charts (taking Yunyan 87 as an example):

[0072] Table 3 Field growth record of Shaoyang Yunyan 87

[0073]

[0074] Table 4 Field fertilization record of Shaoyang Yunyan 87

[0075]

[0076] Table 5 Record of medication management in Shaoyang Yunyan 87

[0077]

[0078] Image collection: Set up signboards in the experimental fields to collect fixed-point images and take photos of the growth and appearance of single tobacco plants and single rows at different growth stages.

[0079] 6. Leaf marking

[0080] According to the growth and development of tobacco leaves in the experimental fields, after cleaning off the three bottom leaves, 550 tobacco plants with normal upper leaves, good growth and development, uniformity and no obvious pests and diseases were selected as experimental tobacco plants in the fixed observation fields of each variety. Each tobacco leaf was marked from bottom to top, and the marking plate was hung on the petiole and tightened to ensure that it would not fall off.

[0081] 7. Special person to pick and roast

[0082] After the tobacco leaves mature, special personnel are arranged to pick and dry them according to the leaf positions. The number of leaves picked and dried for each plant each time is the same. The leaves are classified and arranged according to the leaf positions before being dried. 4-5 harvests are required, of which the upper 5-6 leaves are picked and dried at one time. During the baking process, the test fresh tobacco is placed in the observation window of the baking room and baked together with fresh tobacco with similar baking quality to the test fresh tobacco. The baking process is carried out according to the medium temperature and medium humidity baking process. Mixed varieties and mixed leaf positions are not allowed to be baked. It is necessary to focus on strengthening the guidance and supervision of the picking and baking process, and the implementers should personally check the maturity standards of the picked and baked fresh leaves, the number of leaves picked, and ensure the baking quality.

[0083] 8. Save by category

[0084] After the tobacco leaves are baked, they are sorted and stored in the order of labeling. The same leaves of the same variety are bundled, weighed, and packaged with kraft paper and sample bags for the later collection of tobacco leaf appearance images.

[0085] 9. Delivery of test tobacco leaf samples and data submission

[0086] The test data is collected by the test implementer himself, and records are made at fixed times, fixed points, and fixed plants. Both data and image data are stored, and a dedicated USB flash drive is used to store the data to ensure the integrity of the data. Data collection starts from the date of transplanting, and is recorded in a cycle of 10 days. The number of leaves, plant height, disease conditions, pesticide spraying conditions, weather conditions, and growth conditions of surrounding tobacco plants are recorded until the topping is completed. During harvesting and curing, the field conditions of tobacco plants before harvesting and curing, the agronomic shape of harvesting and curing leaves, curing on braided poles, and the quality of tobacco leaves after curing are recorded.

[0087] The test tobacco leaf samples will be mailed in batches of roasting, with the next roast being mailed after the first roast, and the mailing address is the Southeast Sample Center.

[0088] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0089] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tobacco leaf field monitoring method for collecting tobacco leaf appearance images of multiple varieties and regions, characterized in that: The following steps are involved: (1) Variety selection: Investigate the climate, light and soil ecological conditions of the test area, select tobacco varieties that are suitable for the local ecological environment, and prevent the normal growth of tobacco from being affected by differences in the living environment between varieties; (2) Soil preparation: Conduct field surveys on the soil to ensure that it is suitable for tobacco growth. The soil must be loamy, with medium to high fertility, good light conditions, convenient transportation, and easy irrigation. The field must also have uniform fertility, no serious pests and diseases, and the area must not be less than 1 mu; (3) The monitoring personnel shall determine: Carry out test tracking and implementation management according to the "2+1+N" team deployment model; (4) Unified management: The experimental varieties were sown on the same day in the same nursery, and were managed and transplanted in a unified manner, with a shortened transplanting interval. Water was poured while transplanting to ensure the survival rate of the transplanted varieties. (5) Field data collection: Field data is collected by a dedicated person, and records are kept at fixed times, fixed points, and fixed rows. Both data and image data are stored, and a dedicated U disk is used to ensure data integrity. (6) Leaf marking: After the tobacco leaves are toppled and the foot leaves are removed, the leaves on the tobacco plants are marked with tags. The tags are hung on the petioles and tightened to ensure that they do not fall off. (7) Special person picking and roasting: When the tobacco leaves are mature, special personnel are assigned to harvest them according to the leaf positions marked on the label. The number of leaves harvested and roasted for each plant is the same each time. At the same time, the tobacco leaves harvested each time are classified according to the leaf positions and individually organized into poles before being roasted. (8) Classification and preservation: After the tobacco leaves are baked, they are classified and stored in the order of the leaf positions marked on the labels. The same leaf positions of the same variety are bundled, weighed, and packaged with kraft paper and sample bags for the later collection of tobacco leaf appearance images.

2. The tobacco field monitoring method for collecting tobacco leaf appearance images of multiple varieties and regions according to claim 1 is characterized in that: The "2+1+N" described in step 3 specifically includes: "2" refers to the project leader and implementation personnel of the pilot site, who are the main body of pilot promotion and implementation; "1" is the person in charge of technical follow-up and implementation. A responsible and dedicated tobacco farmer cultivator is selected to follow up and guide the experimental farmers to implement agricultural operations and experimental plan requirements throughout the process; Hire "N" workers with standard agricultural operation and high cooperation degree to be responsible for the implementation of various experimental operation tasks.

3. The tobacco field monitoring method for collecting tobacco leaf appearance images of multiple varieties and regions according to claim 1 is characterized in that: The unified management described in step 4 specifically includes: Formulate and implement different fertilization plans for different varieties, adhere to the cultivation direction of medium-sized tobacco, strictly implement the package fertilization, apply fertilizer scientifically, strictly control the average nitrogen application per mu, and prevent excessive and excessive application of fertilizers outside the package; Manage the experimental fields in accordance with standardized agricultural operation requirements to fully demonstrate the characteristics of the varieties and reduce experimental errors.

4. The tobacco field monitoring method for collecting tobacco leaf appearance images of multiple varieties and regions according to claim 1 is characterized in that: In the field data collection described in step 5, data collection starts from the transplanting date and is recorded in a 10-day cycle, including the number of leaves, plant height, disease conditions, pesticide spraying conditions, weather conditions, and growth conditions of surrounding tobacco plants until the topping is completed; During harvesting and curing, the field conditions of tobacco plants before harvesting and curing, the agronomic shape of the harvested and cured leaves, curing on braided poles, and the quality of the tobacco leaves after curing are recorded, including: (1) Growth period survey: record the entire growth period of tobacco plants, including sowing, transplanting, returning to seedlings, root extension, vigorous growth, and maturity; (2) Investigation of the main agronomic shapes of tobacco leaves: After the tobacco leaves matured, 10 plants of each variety were selected to measure plant height, number of effective leaves, stem girth, internode distance, length and width of the largest waist leaf, length and width of the inverted third leaf, and plant spacing. The length was measured from the junction of the stem and leaves to the tip of the leaf, and the width was based on the widest point; (3) Field management survey: record tobacco plant growth, field fertilization, and drug management, and keep records; (4) Image collection: Set up signboards in the experimental field to collect fixed-point images and take photos of the growth and appearance of individual tobacco plants and individual rows at different growth stages.

Images