A deep soil fumigation method based on intermittent sterilization

Abstract

This invention discloses a deep soil fumigation method based on intermittent sterilization, comprising: (1) cleaning the greenhouse; (2) preparing the land; (3) irrigating; (4) ridging: digging deep ridges along the long side of the greenhouse; (5) setting up a hot air circulation pipe system: installing air supply pipes perpendicular to the direction of the deep ridges, the air supply pipes being connected to a blower via hot air pipes; (6) covering with film; (7) fumigation: performing intermittent deep soil sterilization treatment in the later stage of fumigation, specifically: selecting according to the weather forecast. Choose a period of consecutive sunny days with no clouds and a maximum temperature of over 35°C. Turn on the blower for 1 hour from 13:00 to 14:00 each day to transport the extremely hot air from the upper part of the greenhouse to the furrows. Turn on the blower for 1 hour from 2:00 to 4:00 the next morning to cool the soil. Turn on the blower again for 1 hour from 13:00 to 14:00 on the same day to blow hot air into the furrows. Repeat the above operation until the last day of the greenhouse sealing. After the midday blower operation is completed on the last day of the greenhouse sealing, no more blower operation is performed. (8) Open the greenhouse.

Description

Technical Field

[0001] This invention relates to the technical field of facility agriculture production, specifically to a deep soil fumigation method based on intermittent sterilization. Background Technology

[0002] There are many reasons for continuous cropping obstacles in greenhouse agriculture, with the main cause stemming from the soil. These factors include soil nutrient imbalance, changes in soil pH and physical properties, variations in soil microbial population distribution and diversity, and the accumulation of soil-borne diseases and autotoxic substances. Currently, soil disinfection is a key technology for addressing continuous cropping obstacles in greenhouses. This method is low-cost, simple to operate, and highly effective. Among various existing soil disinfection methods for greenhouse agriculture, high-temperature fumigation is one of the most common.

[0003] Fumigation, also known as greenhouse sealing, refers to sealing a greenhouse with plastic film during the fallow period to rapidly raise the internal air temperature to 60-70°C and maintain it for a certain period, thereby killing pathogens, insect eggs, and weeds in the soil. Currently, common greenhouse fumigation operations mainly include the following steps:

[0004] Step 1: Clean the greenhouse: Remove debris from inside the greenhouse, check and repair any damage to the greenhouse film, and keep the film intact.

[0005] Step 2, Land preparation: After the garden is cleared, use a rotary tiller to prepare the land. To avoid breaking up the residual roots—especially the diseased residual roots left in the shallow soil layer from the previous crop—and to evenly distribute the diseased soil clods that were originally concentrated near the residual roots throughout the soil layer, rotary tillage, a shallow soil turning method, is generally adopted. At the same time, it avoids bringing the diseased residual roots from the shallow soil layer into the deeper soil, which would cause the disease to recur rapidly after the greenhouse is closed. However, rotary tillage can only improve the structure of the shallow soil. Long-term use of rotary tillage will cause soil compaction, which is not conducive to the deep root development of crops and affects crop growth.

[0006] Step 3, Irrigation and Fumigation: After land preparation, irrigate the greenhouse thoroughly, then close the greenhouse and fumigate for 15-25 days. During irrigation, a large volume of water is required, essentially flooding the soil to thoroughly soak it. The irrigation volume is typically 400-500 ml. 3 / acre (if the soil is sandy loam, watering needs to be added once during the process to keep the soil moist and facilitate disinfection). This has three benefits: raising soil temperature during the fumigation period, creating an oxygen-deficient environment in the soil, and carrying soil salts to deeper soil layers to reduce the salt content on the soil surface. During the closure period, a high-humidity and high-temperature environment is created inside the greenhouse, ensuring that the temperature 10cm below the soil surface is above 70℃ and the soil temperature 20cm below the surface is above 45℃, which has a sterilizing and insecticidal effect. If the temperature 10cm below the soil surface does not reach above 70℃, mulch can be used to help raise the soil temperature and achieve the fumigation effect.

[0007] Step 6: Open the greenhouse: Roll up the side film and skylights of the greenhouse to allow it to fully dry and the soil temperature to return to normal. After the greenhouse has dried, apply EM probiotic stock solution and potassium humate to the soil, and till the soil to restore its vitality.

[0008] The principle behind the aforementioned greenhouse fumigation technology is that the soil temperature rises during the fumigation period, killing pests and diseases within the soil. This soil temperature rise originates from heat exchange between the high-temperature air trapped inside the greenhouse in summer and the solar radiation penetrating the greenhouse film. However, in actual fumigation operations, the surface temperature of the soil inside the greenhouse only rises to around 80℃. Therefore, the temperature at a depth of 10cm below the soil surface often falls below 70℃, and the soil temperature at a depth of 20cm often falls below 45℃. Furthermore, the duration of suitable temperatures is greatly affected by the weather, resulting in insufficient disinfection of the deeper soil layers. Insufficient disinfection of the deeper soil layers prevents deep tillage, limiting the crop varieties that can be grown inside the greenhouse to shallow-rooted varieties, making it difficult to cultivate deep-rooted crops. In addition, the inability to deeply till the soil prevents effective improvement of its physical and chemical properties, which is also detrimental to crop cultivation and growth.

[0009] In summary, the main limiting factors for using the fumigation method to disinfect the soil inside the greenhouse are the maximum temperature that the soil can reach during the fumigation period and the duration of the high temperature. In addition, the increase in soil temperature mainly relies on heat exchange and thermal radiation between the air inside the greenhouse and the ground surface, which results in low heating efficiency and shallow soil heating depth.

[0010] To ensure deep soil disinfection, the application of calcium cyanamide to the soil is currently a common method. Calcium cyanamide is a fertilizer made by mixing lime and urea. However, this method of applying calcium cyanamide to the soil has many problems, including: ① Calcium cyanamide itself is prone to ammonia volatilization, causing nitrogen loss; ② The high sulfur content of calcium cyanamide increases soil acidity; ③ Personnel must take appropriate protective measures during application; ④ A long drying time is required after application, and incomplete lime reaction may cause problems such as seedling burn later; ⑤ From the perspective of high-temperature soil disinfection, the heating principle of calcium cyanamide is mainly the chemical energy generated by quicklime and water in the soil. Soil disinfection mainly relies on the temperature rise generated by chemical energy in the soil. However, this temperature rise is short-lived, with rapid heating and rapid cooling, and cannot completely disinfect the soil.

[0011] In the medical field, there are reports on intermittent sterilization methods at room temperature. This method is suitable for preparations or pharmaceuticals that must be sterilized by heat but are intolerant of high temperatures. The specific procedure involves heating the preparation or pharmaceutical to be sterilized at 60–80°C for 1 hour to kill the vegetative bacteria. Then, it is placed at room temperature or in an incubator for 24 hours to allow the spores to develop into vegetative cells. A second heating is then performed to kill these spores. This heating and placement process is repeated three or more times until all spores are eliminated. The temperature used in this intermittent sterilization method is 60–80°C, which coincides with the temperature that soil can reach in greenhouse fumigation techniques. However, current greenhouse fumigation techniques do not report the use of temperature alternation for intermittent sterilization, and there are no effective measures for implementing temperature alternation. Summary of the Invention

[0012] The purpose of this invention is to provide a deep soil fumigation method based on intermittent sterilization, which solves the problem of insufficient disinfection of deep soil by existing fumigation technologies.

[0013] To achieve the above objectives, the present invention adopts the following technical solution.

[0014] A deep soil fumigation method based on intermittent sterilization includes the following steps:

[0015] (1) Clean the greenhouse: Clean up the debris inside the greenhouse, check and repair any damage to the greenhouse film, and keep the greenhouse film intact;

[0016] (2) Land preparation: Deep plowing is used to prepare the land and loosen the soil;

[0017] (3) Irrigation: Irrigate the greenhouse until the soil is fully moist;

[0018] (4) Ridge making: Use a small trenching machine to dig deep ridges in the soil along the long side of the greenhouse;

[0019] (5) Set up a hot air circulation pipe system: Install air supply pipes perpendicular to the direction of the deep ridge, that is, the air supply pipes are perpendicular to the direction of the field ridge and flush with its upper surface; the air supply pipes are closed at one end and have a hot air inlet at the other end, and air supply holes are opened on the pipes; the air supply holes face downwards and are directly opposite the bottom of the furrow, and the hot air inlet is connected to a blower through a hot air pipe.

[0020] (6) Covering: Cover the furrows and air inlet pipes with a plastic film, the plastic film having ventilation holes;

[0021] (7) Fumigation: The greenhouse is sealed and fumigated; deep soil is intermittently sterilized in the later stage of fumigation.

[0022] The method for intermittent sterilization of deep soil is as follows: In the later stage of the fumigation process, based on the weather forecast, select a period of consecutive sunny days with no clouds and a maximum temperature exceeding 35℃. From 13:00 to 14:00 each day, turn on the blowers for 1 hour to transport the extremely hot air from the upper part of the greenhouse into the furrows, rapidly raising the soil temperature on both sides of the furrows and at the bottom 10-15cm to 70℃. The heating time is about 1 hour, and the temperature can be maintained for about 3 hours. From 2:00 to 4:00 the next morning, turn on the blowers for 1 hour to cool the soil, so that the soil temperature drops to about 30-40℃ from 3:00 to 5:00. From 13:00 to 14:00 on the same day, turn on the blowers again for 1 hour to blow hot air into the furrows. Repeat the above operation until the last day of fumigation. After the midday blowing is completed on the last day of fumigation, no more blowing is performed.

[0023] (8) Opening the greenhouse: After the greenhouse is closed, roll up the side film and skylights of the greenhouse to allow it to dry fully and let the soil cool down to normal temperature. Do not remove the film on the field ridges during the drying period. After the greenhouse is closed, remove the film and dismantle the hot air circulation pipe system.

[0024] To address the problem that existing soil fumigation techniques often fail to achieve ideal disinfection results in terms of the maximum temperature and duration of high temperatures in the deep soil layers, this invention employs an "intermittent sterilization method." This method involves pre-opening deep furrows and installing a hot air circulation system to raise the temperature of the deep soil layers, thereby achieving effective disinfection. The specific principle of this invention is as follows:

[0025] In the later stages of greenhouse fumigation, this invention utilizes a hot air circulation pipe system, combined with solar radiation and high temperatures between 1 PM and 2 PM, to transport extremely hot air from the upper part of the greenhouse into the furrows. Because the furrows are deep and long, the hot air has a large contact surface with the soil, resulting in high heat exchange efficiency. Simultaneously, ventilation holes in the film maintain positive pressure within the furrows, rapidly raising the soil temperature to 70°C on both sides and at the bottom (10-15cm), equivalent to a deep soil temperature of 70°C within the greenhouse. This process kills pathogens and their spores. Then, between 2 and 4 AM the following morning (when the air temperature inside the greenhouse is lower), approximately 12 hours later, the blowers are turned on to lower the soil temperature to around 30-40°C between 3 and 5 AM. This causes a large number of pathogen spores to germinate and rapidly develop into pathogens, facilitating their killing by the temperature rise the next day. Then, between 1 PM and 2 PM on the same day, hot air is blown into the furrows to quickly kill the newly developed pathogens and prevent them from continuing to produce spores. Through repeated heating and cooling processes, pathogens in the soil are thoroughly killed. This invention achieves effective disinfection and sterilization of both shallow and deep soil layers through the above treatment, preventing rapid disease recurrence after the greenhouse fumigation process.

[0026] Furthermore, this invention employs deep tillage before soil sterilization, resulting in a loose, soft, well-structured, thick, level, and fertile topsoil layer. This promotes a balanced ratio of solid, liquid, and gaseous phases in the topsoil, making it more suitable for the growth and development of various crops, especially deep-rooted ones, and avoiding the negative impacts of rotary tillage used in existing soil sterilization techniques. Simultaneously, during deep tillage, well-rotted organic fertilizer and chopped straw can be mixed into the soil as base fertilizer. Moreover, this invention utilizes a hot air circulation pipe system to solve the problem of heating dead zones or residual areas caused by deep tillage, ensuring effective soil sterilization.

[0027] Preferably, in step (4), deep ridges are dug, with the furrows being 60-70cm deep, the top of the furrows being 25-30cm wide, the bottom of the furrows being 15-20cm wide, and the ridges being 40-50cm wide.

[0028] Preferably, in step (5), air holes are made on the air delivery pipe at intervals equal to half the sum of the furrow width and the field ridge width. The diameter of the air holes is 5cm, and they face downwards directly to the bottom of the furrow.

[0029] Preferably, in step (5), an air supply pipe is installed every 10 to 15 m perpendicular to the direction of the deep ridges; the air supply pipe is a PVC pipe with a diameter of 10 cm, and the length of the pipe is adapted to the width of the soil and the width of the short side of the greenhouse, that is, it is smaller than the width of the short side of the greenhouse but larger than the width of the soil, so that it can cover the soil along the direction of the short side of the greenhouse.

[0030] Preferably, in step (5), a blower is fixedly installed above each air supply pipe at a location on the frame 1-1.2m below the roof, with its switch located outside the shed. The hot air pipe is a flexible hose, and when connecting the blower and the air supply pipe, it must be ensured that the bend in the hose is an arc-shaped turn without any sharp angles.

[0031] Preferably, in step (6), one ventilation hole with a diameter of 2 to 3 cm is punched on the film above each furrow between every two air supply pipes.

[0032] Preferably, in step (7), the period of consecutive sunny days without clouds and with a maximum temperature exceeding 35°C is ≥5 days; that is, in the later stage of the fumigation process, the number of consecutive days of deep soil intermittent sterilization treatment is ≥5 days. Preferably, the later stage of the fumigation process refers to two weeks or more after the start of the fumigation process, that is, after sealing the greenhouse, the conventional method is used to fumigate for two weeks or even longer before the deep soil intermittent sterilization treatment begins; the entire fumigation process in step (7) is the same as the conventional fumigation technique, specifically 4 to 6 weeks.

[0033] Further, in step (8), after the drying shed is finished, the covering film is removed, the hot air circulation pipe system is dismantled, and then EM probiotic stock solution and potassium humate are applied per acre on the same day; about 3 to 4 days after the application of probiotics, choose a cool evening, spray EM probiotic stock solution evenly on the soil surface again, and then perform surface tillage to restore the soil vitality.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] Compared to existing soil disinfection techniques, the greenhouse fumigation method of this invention only requires changing the original shallow and coarse tillage to deep and fine tillage during land preparation. Simple hot air circulation pipes are installed inside the greenhouse, enabling simultaneous and efficient disinfection of both shallow and deep soil layers. This also effectively improves soil structure, allowing for deep ridging or planting of deep-rooted crops after fumigation, resulting in greater flexibility in crop selection and higher economic benefits. This method efficiently disinfects deep soil, supplemented by the return of organic matter as base fertilizer and the comprehensive utilization of bio-fertilizers, maintaining soil fertility and vitality, avoiding continuous cropping obstacles, and reducing the use of pesticides and fertilizers in agricultural production. It is a highly ecological agricultural facility disinfection operation mode. Attached Figure Description

[0036] Figure 1 A schematic diagram of deep ridges inside a greenhouse;

[0037] Figure 2 This is a schematic cross-sectional view of a hot air circulation duct system.

[0038] Figure 3 This is a schematic diagram of the planar layout of the air supply port pipe. Detailed Implementation

[0039] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1

[0041] The method of deep soil fumigation based on intermittent sterilization, as described in this invention, was used to disinfect and sterilize the soil in facility agriculture during July and August. The specific steps include:

[0042] (1) Cleaning the greenhouse: Clean up the remaining roots and dead leaves of the previous crop, and remove the planting equipment (drip irrigation line, string line, mulch, floor tiles, etc.) and agricultural tools from the greenhouse; check and repair any damage to the greenhouse film, and keep the greenhouse film intact.

[0043] (2) Land preparation: Use deep plowing machinery to prepare the land and loosen the soil. When deep plowing, adopt slow and fine plowing to give full play to the advantages of deep plowing in making the soil layer loose and soft, with good structure, thick topsoil, flat and fertile, and promote the coordination of the solid, liquid and gas phases of the topsoil layer, which is more suitable for the growth and development requirements of various crops, especially deep-rooted crops. At the same time, during the plowing process, well-rotted organic fertilizer, chopped straw and other organic matter can be mixed into the soil as base fertilizer.

[0044] (3) Irrigation: Irrigate the greenhouse until the soil is fully moist, but flooding is not required;

[0045] If the soil in the greenhouse has a high salinity, it is advisable to first flood the greenhouse with water, then close the greenhouse for 3 to 7 days. After the surface water and salt carried by it in the top 50cm layer of soil have settled into the deeper soil layers, the greenhouse can then be sealed according to the method of this invention.

[0046] (4) Ridging: Using a small ditching machine, dig deep ridges along the long side of the greenhouse. Riddle 1 should be 60-70cm deep, with a top width of 25-30cm and a bottom width of 15-20cm. Ridge 2 should be 40-50cm wide. Figure 1 As shown.

[0047] (5) Figure 2 and 3 As shown, a hot air circulation pipe system is set up: an air delivery pipe 3 is installed every 10-15m along the direction perpendicular to the direction of the deep ridge. Specifically, the air delivery pipe is perpendicular to the direction of the ridge and flush with its upper surface.

[0048] The air supply pipe 3 is a PVC pipe with a diameter of 10cm. The length of the pipe is about 1m shorter than the width of the short side of the greenhouse but longer than the width of the soil. One end of the air supply pipe 3 is closed, and the other end is a hot air inlet.

[0049] Air inlets 4 are made on the air inlet pipe 3 at intervals equal to half the sum of the furrow width and the field ridge width. In this embodiment, an air inlet 4 is made every 27.5 to 30 cm, so that each furrow corresponds to an air inlet. Moreover, the air inlet 4 has a diameter of 5 cm and faces downwards directly to the bottom of the furrow 1.

[0050] A small blower 5 is fixedly installed on the shed frame about 1m below the roof of each air supply pipe 3, with its power cord suspended in the air and the switch located outside the shed.

[0051] The air supply pipe 3 is connected to the air outlet of the small blower 5 through the hot air supply pipe 6; the hot air pipe 6 is a flexible hose, and after connection, the bend of the hose body must be an arc-shaped bend without any angles.

[0052] (6) Covering with film: Cover the furrows and air supply pipes with plastic film, and then punch one air hole in the film above each furrow between every two air supply pipes (i.e., form a row of air holes in the film above each furrow). The diameter of the air holes is 2-3 cm.

[0053] (7) Closing the greenhouse: Hang the skirt film and seal the greenhouse for fumigation treatment. If the greenhouse is damaged, it needs to be repaired to ensure that it is airtight. In the later stage of fumigation, deep soil intermittent sterilization treatment is carried out.

[0054] The specific intermittent sterilization treatment for deep soil is as follows:

[0055] After starting the fumigation process, continue fumigation for at least two weeks as per normal procedures. Then, in the later stages of fumigation, based on the weather forecast, select a period of consecutive sunny days with no clouds and a maximum temperature exceeding 35℃ (lasting for more than 5 days). Turn on a small blower for 1 hour each day between 1 PM and 2 PM. The small blower will transport the extremely hot air from the upper part of the greenhouse to the furrows. Because the furrows are deep and narrow, the hot air has a large contact surface with the soil, resulting in high heat exchange efficiency. At the same time, the ventilation holes on the film are small, and the hot air blown into the furrows by the small blower maintains positive pressure within the furrows. Under the combined effect of these two factors, the soil temperature on both sides and at the bottom 10-15cm of the furrows can be rapidly increased to 70℃, and this temperature can be maintained for about 3 hours.

[0056] Between 2 and 4 a.m. the following day, turn on a small blower for 1 hour to cool the soil, so that the soil temperature drops to about 30 to 40°C between 3 and 5 a.m. Under these conditions, a large number of pathogen spores will rapidly develop into pathogens. Between 1 p.m. and 2 p.m. on the same day, turn on the small blower again to blow hot air into the furrows to quickly kill the newly developed pathogens and prevent them from continuing to produce spores.

[0057] Repeat the above operation until the last day of the sealing process. After the ventilation is completed between 13:00 and 14:00 on that day, no further ventilation operation will be performed.

[0058] If the highest ambient temperature on a certain day during the intermittent sterilization treatment of deep soil does not reach 35℃, then a period of consecutive sunny days with a maximum temperature exceeding 35℃ should be selected again for the intermittent sterilization treatment of deep soil.

[0059] (9) Opening the greenhouse: After the greenhouse is closed (specifically after the ventilation is stopped, preferably after the ventilation is stopped and the temperature is maintained for 3 hours), roll up the side film and skylight of the greenhouse to allow the soil to cool down to normal temperature. Do not remove the film above the furrows during the drying period. The greenhouse should be dried for 10 days.

[0060] After the drying process is complete, remove the covering film and dismantle the hot air circulation pipe system. Then, on the same day, apply 5-6 kg of EM probiotic stock solution + 10-12 kg of potassium humate per acre (diluted with 1000 kg of water and sprayed evenly on the soil surface). About three days after applying the probiotics, choose a cool evening and spray the EM probiotic stock solution evenly on the soil surface again before tilling the surface to revitalize the soil and restore it to fertile "living soil".

[0061] At this point, the entire sterilization process in the greenhouse is complete, and transplanting can begin using standard planting techniques.

Claims

1. A deep soil fumigation method based on intermittent sterilization, characterized in that, Includes the following steps: (1) Cleaning the greenhouse: Clean up the debris inside the greenhouse, check and repair any damage to the greenhouse film, and keep the greenhouse film intact; (2) Land preparation: Deep plowing is used to prepare the land and loosen the soil; (3) Irrigation: Irrigate the greenhouse until the soil is fully moist; (4) Ridging: Use a small trenching machine to dig deep ridges in the soil along the long side of the greenhouse; (5) Set up a hot air circulation pipe system: install air supply pipes perpendicular to the direction of the deep ridge, that is, the air supply pipes are perpendicular to the direction of the field ridge and flush with its upper surface; the air supply pipes are closed at one end and have a hot air inlet at the other end, and air supply holes are opened on the pipes; the air supply holes face downwards and are directly opposite the bottom of the furrow, and the hot air inlet is connected to a blower through a hot air pipe. (6) Covering: Cover the furrows and air inlet pipes with a plastic film, the plastic film having ventilation holes; (7) Fumigation: The greenhouse is sealed and fumigation treatment is carried out; in the later stage of fumigation, deep soil intermittent sterilization treatment is carried out; The method for intermittent sterilization of deep soil is as follows: In the later stage of the fumigation process, based on the weather forecast, select a period of ≥5 consecutive days of clear skies with a maximum temperature exceeding 35℃. From 13:00 to 14:00 each day, turn on the blowers for 1 hour to transport the extremely hot air from the upper part of the greenhouse into the furrows, rapidly raising the soil temperature on both sides and at the bottom of the furrows to 70℃. From 2:00 to 4:00 the next morning, turn on the blowers for 1 hour to cool the soil to 30-40℃. From 13:00 to 14:00 on the same day, turn on the blowers again for 1 hour to blow hot air into the furrows. Repeat the above operation until the last day of the fumigation process. After the midday blower operation is completed on the last day of the fumigation process, no further blower operation is performed. (8) Opening the greenhouse: After the greenhouse is closed, roll up the side film and skylights of the greenhouse to allow it to dry fully and let the soil cool down to normal temperature. Do not remove the film on the field ridges during the drying period. After the greenhouse is closed, remove the film and dismantle the hot air circulation pipe system.

2. The deep soil fumigation method based on intermittent sterilization according to claim 1, characterized in that, In step (7), the later stage of the fumigation process refers to two weeks or more after the start of the fumigation process.

3. The deep soil fumigation method based on intermittent sterilization according to claim 2, characterized in that, in In step (4), deep ridges are dug, with furrows 60-70cm deep, furrow tops 25-30cm wide, bottoms 15-20cm wide, and field ridges 40-50cm wide.

4. The deep soil fumigation method based on intermittent sterilization according to claim 3, characterized in that, In step (5), an air supply pipe is installed every 10-15m perpendicular to the direction of the deep ridge. The air supply pipe is a PVC pipe with a diameter of 10cm. The length of the pipe is less than the width of the short side of the greenhouse but greater than the width of the soil. Air supply holes are opened on the air supply pipe at intervals equal to half the sum of the width of the furrow and the width of the field ridge. The diameter of the air supply hole is 5cm and it faces downwards directly to the bottom of the furrow.

5. The deep soil fumigation method based on intermittent sterilization according to claim 4, characterized in that, In step (5), a blower is fixedly installed above each air supply pipe and at a distance of 1 to 1.2 meters from the top of the shed. The switch of the blower is located outside the shed.

6. The deep soil fumigation method based on intermittent sterilization according to claim 5, characterized in that, In step (6), one vent hole with a diameter of 2-3 cm is punched on the film above each furrow between every two air supply pipes.

7. The deep soil fumigation method based on intermittent sterilization according to claim 6, characterized in that, In step (8), after the drying shed is finished, the covering film is removed, the hot air circulation pipe system is dismantled, and then EM probiotic stock solution and potassium humate are applied per acre on the same day; 3 to 4 days after the application of probiotics, choose a cool evening and apply EM probiotic stock solution to the soil surface again and then perform surface tillage.

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