Color-matching full-biodegradable perforated mulching film for tobacco cultivation as well as preparation method and use method of color-matching full-biodegradable perforated mulching film

Abstract

The invention belongs to the technical field of full-biodegradable mulching films, discloses a color-matching full-biodegradable perforated mulching film for tobacco cultivation as well as a preparation method and a use method of the mulching film, and solves the problem that an existing degradable mulching film cannot be matched with a tobacco growth cycle. The two sides of the mulching film are divided into an upper layer and a lower layer, the upper layer is a silver layer, the color of the upper layer is silver, and the thickness of the upper layer is 0.004-0.010 mm; the lower layer is a black layer, the color is black, and the thickness is 0.004-0.010 mm; the middle part of the mulching film is a white layer, the color of the white layer is white, and the thickness of the white layer is 0.008-0.020 mm; the width of the white layer of the mulching film accounts for 25%-30% of the width of the whole mulching film, transplanting holes are evenly distributed in the white layer of the mulching film, the hole diameter of the transplanting holes ranges from 30 mm to 50 mm, and the hole distance ranges from 30 cm to 60 cm. The method can meet the tobacco cultivation requirement, and the yield and quality of tobacco are effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of fully biodegradable mulch film technology, and particularly relates to a color-blocked fully biodegradable perforated mulch film for tobacco cultivation, its preparation method and application method. Background Technology

[0002] Fully biodegradable mulch films utilize microorganisms to decompose the organic components in the film into water, carbon dioxide, and biomass, thus achieving degradation without any environmental pollution. However, existing biodegradable mulch films still have many shortcomings in terms of performance and functional diversity.

[0003] From a performance perspective, some biodegradable mulch films have poor mechanical properties, making them prone to damage during installation and use, and thus failing to meet the actual needs of agricultural production. For example, some starch-based biodegradable mulch films, while possessing good biodegradability, lack sufficient tensile strength and puncture resistance. They are easily torn in strong winds or during field operations, affecting their coverage and hindering their ability to effectively provide insulation and moisture retention. Furthermore, the degradation rate of existing biodegradable mulch films is difficult to control precisely, varying significantly under different climate, soil, and light conditions. In hot and humid environments, some biodegradable mulch films may degrade too quickly, failing to provide sustained protection during critical crop growth periods; conversely, in cold and arid regions, the degradation rate may be too slow, resulting in mulch residue and failing to achieve the expected environmental protection effects.

[0004] In terms of functional diversity, most biodegradable mulch films currently focus solely on solving the degradation problem, while neglecting the unique needs of tobacco cultivation. Tobacco, as an economic crop with relatively specific environmental requirements, not only needs mulch films to provide basic heat preservation and moisture retention, but also requires good weed control, promotion of tobacco root growth, and degradation characteristics that match the tobacco growth cycle. Existing biodegradable mulch films often cannot simultaneously meet these diverse functional requirements, limiting their widespread application in tobacco cultivation. Summary of the Invention

[0005] One objective of this invention is to provide a color-blocked, fully biodegradable, perforated mulch film for tobacco cultivation, effectively solving the problem that existing biodegradable mulch films cannot match the tobacco growth cycle.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a color-blocked, fully biodegradable, perforated mulch film for tobacco cultivation, wherein the mulch film is divided into upper and lower layers on both sides, wherein the upper layer is a silver layer with a thickness of 0.004-0.010mm; and the lower layer is a black layer with a thickness of 0.004-0.010mm.

[0007] The middle part of the mulch film is a white layer, which is transparent white in color and has a thickness of 0.008-0.020 mm.

[0008] The width of the white layer of the mulch film accounts for 25%-30% of the total width of the mulch film. The white layer of the mulch film is provided with transplanting holes for tobacco seedling cultivation. The diameter of the transplanting holes is 30-50mm and the spacing between the holes is 30-60cm.

[0009] Furthermore, the width of the mulch film is 90-120cm.

[0010] Furthermore, the raw materials include PBAT, PLA, PPC, silver masterbatch, black masterbatch, and additives, wherein the additives include plasticizers, chain extenders, and antioxidants.

[0011] The amount of each raw material added is calculated as a percentage of the total mass of all raw materials: 70%-80% PBAT, 5%-10% PLA, 5%-10% PPC, 1%-6% black masterbatch, and 1%-10% silver masterbatch.

[0012] Furthermore, the degradation cycle is 80-150 days.

[0013] Another object of the present invention is to provide a method for preparing the color-blocked, fully biodegradable perforated mulch film for tobacco cultivation as described in the above embodiments, comprising the following steps: Step 1, raw material preparation; prepare PBAT, PLA, PPC, silver masterbatch, black masterbatch and additives according to the formula ratio, and dry PBAT, PLA and PPC respectively.

[0014] Step 2: Add the dried PBAT, PLA, and PPC, along with the silver masterbatch, black masterbatch, and additives, to a high-speed mixer and mix thoroughly according to the set ratio.

[0015] Step 3: Feed the mixed material into the extruder for melt extrusion.

[0016] The temperature settings of the extruder are divided into three sections from the feed inlet to the discharge outlet: the first section is set to 150-160℃, the second section is set to 160-170℃, and the third section is set to 160-170℃.

[0017] The molten material is pushed by the screw of the extruder and extruded through the die to form a mulch film blank.

[0018] Step 4: Use a mechanical punching device to punch holes at fixed intervals in the white layer of the extruded mulch film blank.

[0019] Step 5: Roll up and package.

[0020] Furthermore, in step 1, the drying process is as follows: using a vacuum drying oven, PBAT is dried at 80-90℃ for 4-6 hours, PLA is dried at 60-70℃ for 3-5 hours, and PPC is dried at 50-60℃ for 2-3 hours.

[0021] Furthermore, in step 2, the mixing time of the high-speed mixer is 15-20 minutes, and the mixing speed is 800-1200 rpm.

[0022] Another objective of this invention is to provide a method for using the color-blocked, fully biodegradable, perforated mulch film for tobacco cultivation as described in the above embodiments, comprising: 1. Field layout: Before laying the mulch film, the tobacco field is prepared by ridging, with the ridge spacing determined according to the row spacing of the tobacco plants, and the ridge surface should be flat and fine; the mulch film is laid along the ridge surface, with the silver and black layers of the mulch film located on both sides of the ridge, and the white layer located in the middle of the ridge surface, with the white layer covering the top of the tobacco plant rows; when laying, the mulch film should be stretched taut and laid flat to ensure that the mulch film fits tightly against the ridge surface, avoiding air bubbles and wrinkles, and then the edges of the mulch film are compacted with soil, with a soil compaction width of 10-15cm.

[0023] II. Transplanting Operation: Transplanting can be done under the film or on the film. When transplanting under the film, place the tobacco seedlings into the transplanting hole, water them thoroughly, and then use soil to compact the film around the transplanting hole. When transplanting on the film, transplant the tobacco seedlings into the transplanting hole, so that the seedlings are exposed from the film, and similarly use soil to compact the film around the transplanting hole.

[0024] Compared with existing technologies, the beneficial technical effects of this invention are as follows: The mulch film of this invention, through its innovative structural design, is adapted to the needs of tobacco cultivation, effectively improving tobacco yield and quality. Specifically, the silver layer enhances plant protection, the black layer controls temperature and suppresses weeds, and the white layer optimizes tobacco growth through transplanting holes. Furthermore, the main components of the mulch film of this invention are biodegradable materials such as PBAT, PLA, and PPC, which can degrade into water, carbon dioxide, etc., within 80-150 days (matching the tobacco growth cycle), leaving no soil residue and balancing ecological and agricultural benefits. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the longitudinal section structure of the present invention.

[0026] Figure 2 This is a top view of the present invention.

[0027] Explanation of reference numerals in the attached diagram: Silver layer - 1; Black layer - 2; White layer - 3; Transplanting hole - 4. Detailed Implementation

[0028] Example 1: Color-blocked, fully biodegradable perforated mulch film for tobacco cultivation. The mulch film is in the form of a roll when not unfolded, and rectangular when unfolded. The width of the mulch film is customized according to the row spacing requirements of tobacco planting, and the common width is 90-120cm. The length of the mulch film can be produced by winding according to the actual use, and the length of each roll is usually 500-1000m.

[0029] like Figure 1 As shown, the mulch film is divided into two layers on both sides. The upper layer is silver layer 1, which is silver in color and has a thickness of 0.004-0.010mm. This thickness ensures that the silver layer 1 has good reflective properties without increasing production costs too much. The lower layer is black layer 2, which is black in color and has a thickness of 0.004-0.0010mm. The relatively thicker black layer 2 can better perform its function of absorbing heat and inhibiting weed growth.

[0030] The middle part of the mulch film is a white layer 3, which is transparent white in color. The thickness of white layer 3 is 0.008-0.020mm, and the width of white layer 3 accounts for 25%-30% of the total width of the mulch film. For example... Figure 2 As shown, the white layer 3 has transplanting holes 4 for tobacco seedling cultivation. The diameter of the transplanting holes 4 is 30-50mm, and the spacing between the holes is set according to the tobacco variety and the soil's water retention and aeration requirements, generally 30-60cm. This unique structural design of the mulch film provided in this embodiment allows the mulch film to perform different functions in different areas, meeting the diverse needs of tobacco growth.

[0031] The silver layer 1 has excellent light-reflecting properties. The silver portion on both sides of the upper layer of the mulch film can reflect sunlight onto the middle and lower leaves of the tobacco plant, increasing the light intensity in these areas. For example, in the morning and evening when the sun shines at an angle, the silver layer 1 can reflect light onto the back of the tobacco leaves, allowing for more efficient photosynthesis. This helps improve the photosynthetic efficiency of tobacco leaves, promotes leaf growth and development, increases leaf thickness and chlorophyll content, and thus improves tobacco quality. Simultaneously, the silver layer can also reflect ultraviolet rays, repelling some pests and reducing pest damage to tobacco, lowering the probability of pest and disease occurrence, reducing pesticide use, and contributing to the production of green and environmentally friendly tobacco products.

[0032] The second black layer absorbs a significant amount of solar radiation heat. The black portions on both sides of the mulch film effectively raise soil temperature. During the early stages of tobacco growth, especially in spring when temperatures are low, the heat absorbed by the second black layer is transferred to the soil, increasing its temperature and providing a suitable environment for seed germination and seedling growth. Related experimental data shows that using this mulch film with the second black layer can raise the soil surface temperature by 2-4°C on sunny spring days compared to ordinary mulch film. Furthermore, the black mulch film is opaque, effectively suppressing weed growth. Without sufficient light, weeds cannot perform normal photosynthesis, inhibiting their growth and reducing competition for nutrients, water, and space between weeds and tobacco. This ensures a sufficient supply of nutrients for tobacco growth and promotes its healthy development.

[0033] The white layer 3 primarily serves to facilitate observation. During tobacco cultivation, it's necessary to regularly monitor soil moisture and root growth. The transparent white mulch makes these observations clearer and more intuitive, allowing growers to understand the tobacco's growth status and take appropriate management measures. For example, when soil moisture is low, the soil under the transparent white mulch will appear lighter in color, allowing growers to irrigate promptly. Similarly, when abnormal root growth is detected, the transparent white mulch can quickly pinpoint the problem area for targeted treatment.

[0034] In this embodiment, transplanting holes 4 for tobacco seedling cultivation are set in the white layer 3, which has the following significance: (1) Aeration and root protection: The fixed-distance holes provide aeration channels for the soil, meet the respiratory needs of tobacco roots, promote root growth and development, and avoid abnormal growth caused by root hypoxia. (2) High-efficiency water and fertilizer: The transplanting holes 4 can be used as precise irrigation and fertilization channels, with water and fertilizer directly reaching the roots. Water utilization rate is increased by 30%-40%, fertilizer utilization rate is increased by 20%-30%, and resource waste and cost are reduced. (3) Flood prevention and moisture retention: During rainfall or irrigation, water quickly penetrates the soil through the transplanting holes 4, avoiding water accumulation on the surface of the mulch film, while maintaining stable soil moisture and preventing the effects of drought and flood. (4) Auxiliary management: The transplanting holes 4 are located in the white layer 3 in the middle of the mulch film. Combined with the high visibility of the transparent white mulch film, it is convenient to observe soil moisture and root growth status, and adjust irrigation, fertilization and other management measures in a timely manner.

[0035] The mulch film in this embodiment is made of a fully biodegradable material. Its main components include polybutylene adipate terephthalate (PBAT), polylactic acid (PLA), and polypropylene carbonate (PPC), as well as silver masterbatch, black masterbatch, and other additives (such as plasticizers, chain extenders, and antioxidants). PBAT has good flexibility and processing properties, PLA has high strength and modulus, and PPC material has excellent water vapor barrier properties, effectively improving the thermal insulation performance of the mulch film. In the natural environment, the mulch film is first eroded by microorganisms in the soil. Enzymes secreted by these microorganisms decompose the organic components in the mulch film. For example, esterases act on the ester bonds of PBAT and PLA, causing them to break and gradually degrade into oligomers and monomers, which are eventually decomposed into carbon dioxide, water, and biomass. Simultaneously, moisture and oxygen in the soil also participate in the degradation process, accelerating the decomposition of the mulch film.

[0036] The degradation cycle of the mulch film provided in this embodiment can be adjusted according to the climate, soil conditions, and tobacco growth cycle of different regions. Generally, the mulch film can be basically completely degraded within 80-150 days after the tobacco growth cycle ends. In the warmer and more humid southern regions, the degradation rate is relatively fast, taking about 80 days; while in the cooler and drier northern regions, the degradation cycle may be extended to about 150 days. This degradation characteristic, which matches the tobacco growth cycle, ensures that the mulch film can play its due role in the tobacco growth process, while avoiding mulch film residue in the soil, reducing soil pollution, and achieving sustainable development of agricultural production.

[0037] Example 2: The preparation method of the color-blocked fully biodegradable perforated mulch film for tobacco cultivation described in Example 1 includes the following steps: Step 1, raw material preparation: Prepare PBAT, PLA, PPC, silver masterbatch, black masterbatch, and additives (such as plasticizers, chain extenders, and antioxidants) according to the formula ratio. In the formula: PBAT accounts for 70%-80% of the total mass of all raw materials, PLA accounts for 5%-10% of the total mass of all raw materials, PPC accounts for 5%-10% of the total mass of all raw materials, black masterbatch accounts for 1%-6% of the total mass of all raw materials, and silver masterbatch accounts for 1%-10% of the total mass of all raw materials.

[0038] PBAT, PLA, and PPC are dried separately to remove moisture and improve material stability and processing performance. For example, using a vacuum drying oven, PBAT is dried at 80-90℃ for 4-6 hours, PLA at 60-70℃ for 3-5 hours, and PPC at 50-60℃ for 2-3 hours.

[0039] Step 2: Ingredient mixing. Add the dried PBAT, PLA, and PPC, along with the silver masterbatch, black masterbatch, and additives, to a high-speed mixer according to the set ratio. Mix the ingredients thoroughly and evenly under high-speed mixing conditions. The mixing time is generally 15-20 minutes, and the mixing speed is 800-1200 rpm to ensure that the material has stable performance and uniform color during subsequent processing.

[0040] Step 3, Extrusion Molding: The mixed material is fed into an extruder for melt extrusion. The extruder temperature is set in multiple stages: the temperature gradually increases from the feed inlet to the discharge outlet. Generally, the first stage temperature is set at 150-160℃ to initially soften the material; the second stage temperature is set at 160-170℃ to promote further melting of the material; and the third stage temperature is set at 160-170℃ to completely melt and uniformly plasticize the material.

[0041] Driven by the screw of the extruder, the molten material is extruded through a die with a specific shape into a mulch film preform with a double-layer structure on both sides and a single-layer structure in the middle. The upper layers on both sides of the mulch film are silver layers 1, the lower layers on both sides of the mulch film are black layers 2, and the middle layer of the mulch film is white layers 3.

[0042] Step 4: Drilling Transplanting Holes 4: Transplanting holes 4 are drilled on the extruded mulch film blank. A mechanical drilling device is used, employing a drilling die with a specific diameter and spacing to drill holes at fixed intervals in the white layer 3. The rotation speed and moving speed of the drilling die are precisely controlled according to the set hole spacing. For example, when the hole spacing is 10cm, the drilling die rotation speed is 50-60rpm, and the moving speed is 1-1.2m / min, ensuring that the drilled transplanting holes 4 have a uniform diameter and accurate spacing, meeting design requirements.

[0043] Step 5: Winding and Packaging: After the transplanting holes (4 holes) are punched, the plastic film is conveyed to the winding equipment via a traction device. The winding equipment winds the film at a constant speed to form a roll of film of a specific size. During the winding process, it is important to control the winding tension to avoid wrinkles or stretching deformation of the film. After winding, the film roll is packaged using plastic film or paper packaging materials, and labeled with product name, specifications, production date, and other information for easy storage and transportation.

[0044] Example 3: The method of using the color-blocked, fully biodegradable perforated mulch film for tobacco cultivation described in Example 1, or the mulch film prepared using the method described in Example 2, includes: (I) Timing of laying: The mulch film is laid before tobacco transplanting. The appropriate time is selected based on the climate conditions and tobacco variety of different regions. Generally, laying is carried out when the soil temperature is stable above 10-12℃ and the soil moisture is suitable. For example, in southern regions, it can be done from late March to early April; in northern regions, it is done from late April to early May, ensuring that the mulch film can provide good environmental conditions for tobacco growth.

[0045] (II) Field layout: Before laying the mulch, the tobacco field should be prepared by ridging. The ridge spacing is determined according to the row spacing of tobacco planting, generally 100-120cm, and the ridge height is 30-35cm. The ridge surface should be flat and fine, without stubble and large clods.

[0046] Lay the plastic film along the ridge surface, with the silver layer 1 and black layer 2 on both sides of the ridge, and the white layer 3 in the middle of the ridge surface, covering the tobacco plant rows.

[0047] When laying the mulch film, it should be stretched taut and laid flat to ensure that it fits tightly against the ridge surface and avoids air bubbles and wrinkles. Then, the edges of the mulch film should be compacted with soil, with a soil compaction width of 10-15cm, to prevent the mulch film from being blown away by the wind.

[0048] (III) Transplanting operation: Transplanting under the film or transplanting on the film. When transplanting under the film, place the tobacco seedlings into the pre-made transplanting hole 4, water them thoroughly, and then use soil to compact the film around the transplanting hole 4 so that the tobacco seedlings are in close contact with the film.

[0049] When transplanting on the film, transplant the tobacco seedlings into the pre-made transplanting holes 4 in the film, so that the seedlings are exposed. Similarly, use soil to compact the film around the transplanting holes 4 to ensure that the seedlings can grow normally.

[0050] The key points for maintaining plastic film are as follows: (1) Preventing damage: During the laying and field operations, care should be taken to avoid the plastic film being torn or ripped. When using farm tools, operate them carefully to avoid sharp farm tools coming into contact with the plastic film. When weeding, use small and lightweight farm tools as much as possible and control the depth of operation to prevent hoes or shovels from tearing the plastic film. At the same time, prevent livestock from entering the tobacco field and trampling the plastic film. Once the plastic film is found to be damaged, it should be covered with soil or repaired with special plastic film repair tape in time to ensure the integrity of the plastic film and maintain its heat preservation, moisture retention and weed suppression effects. (2) Coping with special weather: When encountering windy weather, check the fixing of the plastic film in advance, reinforce the places where the soil is not compacted, increase the width and thickness of the soil compaction, or press sandbags or stones on the plastic film at certain intervals to prevent the plastic film from being lifted by the wind. After heavy rain, check the surface of the mulch film for water accumulation. If water is present, make holes in the mulch film to drain it and prevent the tobacco seedlings from being soaked for a long time, which would affect their growth. During hot weather, pay attention to the temperature changes under the mulch film. If the temperature under the mulch film is too high, make holes in the mulch film for ventilation and cooling to prevent the high temperature from damaging the tobacco seedlings. (3) Regular inspection: During the tobacco growth process, regularly check the condition of the mulch film. Check whether the mulch film is tightly attached, whether it is damaged, and whether the holes are unobstructed. At the same time, observe the effect of the mulch film on the tobacco growth, such as whether the soil moisture and temperature are suitable, and whether the root growth of the tobacco plants is normal. Based on the inspection results, take appropriate measures to adjust and maintain the mulch film in a timely manner to ensure that the mulch film can continuously provide good environmental conditions for the tobacco growth.

[0051] The mulch film of this invention, through its innovative structural design, is adapted to meet the needs of tobacco cultivation, effectively improving the yield and quality of tobacco. (1) The silver layer 1 of the mulch film of this invention can enhance plant protection: by reflecting sunlight to the middle and lower leaves of tobacco, it can improve photosynthetic efficiency, increase leaf thickness and chlorophyll content, and improve tobacco quality; at the same time, it can reflect ultraviolet rays to repel pests, reduce pests and diseases and pesticide use, and help green planting. (2) The black layer 2 of the mulch film of this invention can control temperature and suppress weeds: by efficiently absorbing solar radiation heat through the black layer 2, the soil surface temperature is increased by 2-4℃ compared with ordinary mulch film, providing a suitable temperature environment for tobacco seedlings; and the opaque nature can suppress the photosynthesis of weeds, reducing the competition between weeds and tobacco for water and fertilizer space. (3) The white layer 3 in the middle part of the mulch film of the present invention optimizes tobacco growth through the transplanting hole 4: the white layer 3 is perforated at fixed intervals (30-50mm diameter, 30-60cm spacing) to form a breathable channel to meet the root breathing needs, while facilitating the rapid infiltration of water to avoid water accumulation. It can also be used as a channel for precise irrigation and fertilization, thereby increasing the utilization rate of water and fertilizer by 30%-40% and 20%-30% respectively, and reducing costs.

[0052] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A color-blocked, fully biodegradable, perforated mulch film for tobacco cultivation, characterized in that, The mulch film is divided into two layers on both sides. The upper layer is a silver layer with a thickness of 0.004-0.010 mm; the lower layer is a black layer with a thickness of 0.004-0.010 mm. The middle part of the mulch film is a white layer, which is transparent white in color and has a thickness of 0.008-0.020 mm; The width of the white layer of the mulch film accounts for 25%-30% of the total width of the mulch film. The white layer of the mulch film is provided with transplanting holes for tobacco seedling cultivation. The diameter of the transplanting holes is 30-50mm and the spacing between the holes is 30-60cm.

2. The color-blocked, fully biodegradable, perforated mulch film for tobacco cultivation according to claim 1, characterized in that, The width of the mulch film is 90-120cm.

3. The color-blocked, fully biodegradable, perforated mulch film for tobacco cultivation according to claim 2, characterized in that, The raw materials include PBAT, PLA, PPC, silver masterbatch, black masterbatch, and additives, including plasticizers, chain extenders, and antioxidants. The amount of each raw material added is calculated as a percentage of the total mass of all raw materials: 70%-80% PBAT, 5%-10% PLA, 5%-10% PPC, 1%-6% black masterbatch, and 1%-10% silver masterbatch.

4. The color-blocked, fully biodegradable, perforated mulch film for tobacco cultivation according to claim 3, characterized in that, The degradation cycle is 80-150 days.

5. The method for preparing the color-blocked, fully biodegradable, perforated mulch film for tobacco cultivation according to any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Prepare raw materials; Prepare PBAT, PLA, PPC, silver masterbatch, black masterbatch and additives according to the formula ratio, and dry PBAT, PLA and PPC separately. Step 2: Add the dried PBAT, PLA, and PPC, along with the silver masterbatch, black masterbatch, and additives, to a high-speed mixer and mix well according to the set ratio. Step 3: Feed the mixed material into an extruder for melt extrusion; The temperature settings of the extruder are divided into three sections from the feed inlet to the discharge outlet: the first section is set at 150-160℃, the second section at 160-170℃, and the third section at 160-170℃. The molten material is pushed by the screw of the extruder and extruded through the die to form a mulch film blank; Step 4: Use a mechanical punching device to punch holes at fixed intervals in the white layer of the extruded plastic film blank; Step 5: Roll up and package.

6. The method for preparing the color-blocked, fully biodegradable, perforated mulch film for tobacco cultivation according to claim 5, characterized in that, In step 1, the drying process is as follows: using a vacuum drying oven, PBAT is dried at 80-90℃ for 4-6 hours, PLA is dried at 60-70℃ for 3-5 hours, and PPC is dried at 50-60℃ for 2-3 hours.

7. The method for preparing the color-blocked, fully biodegradable, perforated mulch film for tobacco cultivation according to claim 6, characterized in that, In step 2, the mixing time of the high-speed mixer is 15-20 minutes, and the mixing speed is 800-1200 rpm.

8. The method of using the color-blocked, fully biodegradable, perforated mulch film for tobacco cultivation as described in any one of claims 1-4, or the color-blocked, fully biodegradable, perforated mulch film for tobacco cultivation prepared by the preparation method described in any one of claims 5-7, characterized in that, include: I. Field layout: Before laying the mulch film, the tobacco field should be prepared by ridging. The ridge spacing should be determined according to the row spacing of tobacco planting, and the ridge surface should be flat and fine. Lay the plastic film along the ridge surface, with the silver and black layers on both sides of the ridge and the white layer in the middle, covering the tobacco plant rows. When laying the mulch film, it should be stretched taut and laid flat so that it fits tightly against the ridge surface to avoid air bubbles and wrinkles. Then, the edges of the mulch film should be compacted with soil, with a compaction width of 10-15cm. II. Transplanting operation: Transplanting under the film or transplanting on the film is adopted; When transplanting under the film, place the tobacco seedlings into the transplanting hole, water them thoroughly to help them settle, and then use soil to compact the film around the transplanting hole. When transplanting on the film, transplant the tobacco seedlings into the transplanting hole so that the seedlings are exposed outside the film. Similarly, use soil to compact the film around the transplanting hole.

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