System and method for repairing soil fertility by using soil nematodes

Abstract

The invention discloses a system and method for repairing soil fertility by using soil nematodes, and belongs to the technical field of soil remediation, the system comprises a vertical support tube and a medicament release tube slidably and hermetically mounted in the support tube, and the medicament release tube is filled with a soil nematode repairing agent; a plurality of first through holes are evenly formed in the pipe wall of the supporting pipe at intervals in the axial direction, filter screens are installed in the first through holes, second through holes corresponding to the first through holes are formed in the pipe wall of the medicament releasing pipe, and a medicament supplementing pipe is connected to the upper end of the medicament releasing pipe and extends out of the upper end of the supporting pipe; a displacement slow-release device is connected between the agent release pipe and the supporting pipe, the supporting pipe is vertically inserted into the soil, and the displacement slow-release device is used for controlling the agent release pipe to move in the axial direction of the supporting pipe so that the soil nematode repairing agent can be released in the soil at different depths. The soil remediation agent can permeate into deep soil, so that the soil fertility remediation effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil remediation, and in particular relates to a system and method for restoring soil fertility by utilizing soil nematodes. Background Art

[0002] Due to long-term over-fertilization of farmland, marine organic pollution and other reasons, there is heavy metal and polycyclic aromatic hydrocarbon organic pollution in the soil in some areas. Although studies have shown that only some areas are slightly polluted, it may also affect soil fertility and pose a potential ecological risk. Therefore, it is necessary to repair the fertility of the soil in this area. Chinese patent CN109702001B discloses a method for repairing soil fertility using soil nematodes. This method sprays a soil nematode repair agent into a shallow groove opened in the soil, and then uses soil nematodes to degrade the organic matter and metal content in the soil, thereby improving the soil environment. However, since heavy metals are usually present at different depths in the soil, conventional repair methods make it difficult for soil repair agents to penetrate deep into the soil. Therefore, the above method has problems such as incomplete repair. Summary of the Invention

[0003] In view of this, the object of the present invention is to provide a system and method for repairing soil fertility using soil nematodes, which can penetrate soil repair agents into deep soil to improve the effect of soil fertility repair.

[0004] In order to achieve the above object, the present invention provides the following technical solutions: The present invention discloses a system for restoring soil fertility by utilizing soil nematodes, comprising a vertical support tube and an agent releasing tube installed in the support tube with a sliding seal, the agent releasing tube being filled with a soil nematode restoring agent, a tube wall of the support tube being provided with a plurality of first through holes evenly spaced along the axial direction, a filter screen being installed in the first through holes, a tube wall of the agent releasing tube being provided with second through holes corresponding to the first through holes, the upper end of the agent releasing tube being connected to a tonic tube, the tonic tube extending from the upper end of the support tube; a displacement slow-release device being connected between the agent releasing tube and the support tube, the support tube being vertically inserted into the soil, the displacement slow-release device being used to control the axial displacement of the agent releasing tube along the support tube to realize the release of the soil nematode restoring agent at different depths in the soil.

[0005] Furthermore, a piston is installed at the tube mouth of the medicine release tube in a sliding seal, and the piston is connected to a first telescopic device, which is fixed to the inner bottom of the medicine release tube. The first telescopic device can drive the piston to move in the medicine release tube, thereby changing the pressure in the medicine release tube.

[0006] Furthermore, a limit plate and a filter plate are fixed to the lower end of the tonic tube at the same time. A space for installing a piston is formed between the limit plate and the filter plate. The limit plate and the filter plate are located on the upper and lower sides of the piston respectively. The lower end of the tonic tube passes through the center hole opened in the center of the piston and is fixedly connected to the filter plate. The output end of the first telescopic device is connected to the filter plate. The tonic tube is also in rotational sealing cooperation with the piston.

[0007] Furthermore, a blade assembly is also installed on the lower side of the filter plate. The blade assembly includes an outer blade and an inner blade in the form of a straight plate. A groove is formed on the inner side of the outer blade for sliding fit of the inner blade. An open groove is provided on the surface of the outer blade along its length. A sliding shaft is fixed to one side of the inner blade, and the sliding shaft is slidably installed in the open groove; the upper end of the outer blade is fixedly connected to the filter plate.

[0008] Furthermore, a sleeve is installed on the outer sliding seal of the support tube, and a first elastic support device is installed axially with the sleeve and the support tube. An annular groove is provided at the lower end of the sleeve, and a fixed inner conical ring and a movable inner conical ring are arranged at intervals in the annular groove. The outer conical surface of the fixed inner conical ring faces downward, and the outer conical surface of the movable inner conical ring faces upward. The movable inner conical ring is slidably installed on the upper side of the fixed inner conical ring, and a second elastic support device is connected between the fixed inner conical ring and the movable inner conical ring; the lower end of the support tube is connected to a slider through a third elastic support device, and a wedge-shaped surface is formed on the upper side of the slider, and the slider is set in a blind groove provided on the outer wall of the support tube for radial sliding along the support tube.

[0009] Furthermore, a cable channel is opened on the inner side of the support tube, and a cable is installed in the cable channel. The lower end of the cable is connected to an electrode plate, and two electrode plates form a group. A slide is opened coaxially at the lower end of the cable channel, and a memory alloy tube is slidably arranged in the slide. The memory alloy tube is fixedly sleeved on the outside of the cable; a panel is fixed at the lower end of the support tube, and a wire feeding device for controlling the extension and retraction of the memory alloy tube is installed on the panel.

[0010] Furthermore, a rotating seat is fixed on one side of the panel, and a steering tube is rotatably installed in the rotating seat. The steering tube includes a vertical tube, a curved tube and a horizontal tube with smooth transition connections. The lower end of the memory alloy tube passes through the vertical tube and the curved tube in sequence and then exits from the horizontal tube. The vertical tube of the steering tube is rotatably installed in the rotating seat, and the vertical tube is also connected to a rotating drive device that drives it to rotate.

[0011] Furthermore, the lower end of the sleeve is hinged with multiple baffles, which are evenly spaced along the circumference of the sleeve. The upper ends of the baffles are connected to the sleeve through elastic reset devices, and the multiple baffles are combined to form a tip; the lower end of the support tube is fixed with a second telescopic device, and the output end of the second telescopic device is connected to a retaining ring, which can drive the multiple baffles to deflect outward when the retaining ring is displaced.

[0012] Furthermore, the system also includes a frame, a roller is installed at the bottom of the frame, a first guide rail is installed on the upper side of the frame, the first guide rail is fixedly connected to the second guide rail through a column, the second guide rail is installed parallel to the upper side of the first guide rail, a plurality of first slides are slidably installed on the first guide rail, and a second slide is slidably installed on the second guide rail corresponding to the first slide one by one, a motor is fixed on the bottom of the first slide, the motor is connected to a screw, the middle part of the screw is threadedly connected to a moving block, a guide rod is simultaneously slidably penetrated on the moving block, the two ends of the guide rod and the screw are respectively rotatably connected to the first slide and the second slide, and the moving block is connected to the support tube through a support plate; multiple first slides are simultaneously connected to an equidistant control structure.

[0013] A method for restoring soil fertility using soil nematodes, using a system as described in any of the above items. When in use, an agent release tube is located inside a support tube and is filled with a soil nematode remediation agent. The support tube is then inserted into the soil, and the position of the support tube is adjusted to remain vertical so that the upper end opening of the support tube can be exposed from the soil surface. The agent release tube is controlled to move axially along the support tube by a displacement slow-release device. After the agent release tube is displaced, when the first through hole and the second through hole overlap, the soil nematode remediation agent can be continuously released into the soil. When the soil nematode remediation agent in the agent release tube is insufficient, the soil nematode remediation agent is supplemented through the supplementary drug tube.

[0014] The beneficial effects of the present invention are: The present invention discloses a system and method for restoring soil fertility using soil nematodes. The system controls the axial displacement of an agent release tube along a support tube through a displacement slow-release device. After the agent release tube is displaced, the soil nematode repair agent can be continuously released into the soil, thereby achieving the release of the soil nematode repair agent at different soil depths, thereby improving the repair range and capacity of soil repair and solving technical problems.

[0015] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration: Figure 1 Schematic diagram of the structure of the system of the present invention; Figure 2 Schematic diagram of the casing structure; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 is a cross-sectional view of the support tube; Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 is a schematic diagram of the tip structure; Figure 7 for Figure 6 Enlarged view of point C in the middle; Figure 8 is a structural schematic diagram of a blade assembly; Figure 9 It is a structural diagram of the movable inner cone ring.

[0017] The numbers in the accompanying drawings are as follows: support tube 1, drug release tube 2, first through hole 3, filter screen 4, second through hole 5, drug supplement tube 6, displacement slow-release device 7, piston 8, first telescopic device 9, limit plate 10, filter plate 11, blade assembly 12, outer blade 13, inner blade 14, notch 15, open groove 16, slide shaft 17, sleeve 18, first elastic support device 19, ring groove 20, fixed inner cone ring 21, movable inner cone ring 22, second elastic support device 23, third elastic support device 24, slider 25, wedge Surface 26, blind groove 27, cable channel 28, cable 29, electrode sheet 30, slide 31, memory alloy tube 32, panel 33, wire feeding device 34, rotating seat 35, vertical tube 36, curved tube 37, horizontal tube 38, rotating drive device 39, baffle 40, elastic reset device 41, second telescopic device 42, retaining ring 43, frame 44, roller 45, first guide rail 46, column 47, second guide rail 48, first slide 49, second slide 50, screw 51, moving block 52, guide rod 53, support plate 54. DETAILED DESCRIPTION

[0018] like Figures 1 to 9 As shown, the present invention discloses a system for restoring soil fertility using soil nematodes, comprising a vertical support tube 1 and a drug release tube 2 that is slidably and sealingly mounted within the support tube 1. The support tube 1 is a vertical tubular structure made of stainless steel, allowing for easy direct insertion into the soil. The outer diameter of the drug release tube 2 is adapted to the inner diameter of the support tube 1, allowing it to be sealed securely within the support tube 1, preventing the ingress of impurities and reducing the possibility of jamming.

[0019] The agent release tube 2 is filled with a soil nematode remediation agent, which adopts existing technology and is composed of a root-knot nematode suspension, humic acid and ammonium chloride. The wall of the support tube 1 is provided with a plurality of first through holes 3 evenly spaced along the axial direction. A filter screen 4 is installed in the first through hole 3, which can prevent soil from entering to a certain extent, but allows the agent to pass through.

[0020] Specifically, a second through hole 5 corresponding to the first through hole 3 is formed on the wall of the drug release tube 2. When the first through hole 3 and the second through hole 5 overlap, the soil nematode remediation agent can be continuously released from the drug release tube 2 through the first through hole 3 and the second through hole 5 into the soil. To facilitate the replenishment of the soil nematode remediation agent, the upper end of the drug release tube 2 is connected to a tonic tube 6, which is equipped with a valve and extends from the upper end of the support tube 1. A displacement slow-release device 7 is connected between the drug release tube 2 and the support tube 1. The support tube 1 is vertically inserted into the soil. The displacement slow-release device 7 is used to control the axial displacement of the drug release tube 2 along the support tube 1 to achieve the release of the soil nematode remediation agent at different depths in the soil.

[0021] The displacement release mechanism 7 of the present invention utilizes a support spring mounted at the bottom of the support tube 1, with its upper end connected to the bottom of the medication release tube 2. This spring provides elastic support for the medication release tube 2. When the medication release tube 2 is fully loaded, its own weight compresses the support spring to its maximum position, placing it at the very bottom of the support tube 1. As the medication release tube 2 gradually releases medication, it becomes lighter, and the support spring rebounds, supporting it upward, thereby enabling movement of the medication release tube 2. It will be appreciated that the elastic coefficient of the support spring and the size of the medication release tube 2 can be selected as needed to achieve the desired release effect of the displacement release mechanism 7.

[0022] In some other embodiments, the displacement release device 7 may also be electrically controlled, for example, by using a linearly displaceable cylinder, which can be conveniently controlled by connecting the cylinder to the drug release tube 2. The embodiment of the present invention uses a purely mechanical support spring, which not only provides stable control but also saves costs, can cope with harsh planting environments, and is easy to maintain.

[0023] In this embodiment, a piston 8 is slidably and sealably mounted at the opening of the drug release tube 2. This piston 8 is connected to a first telescopic device 9, which is fixed to the inner bottom of the drug release tube 2. The first telescopic device 9 can drive the piston 8 to move within the drug release tube 2, thereby varying the pressure within the tube 2. Because the soil in the lower layer has a greater earth pressure, the release rate of the drug release tube 2 can be slowed. By providing the piston 8, the present invention can pressurize the drug release tube 2, thereby adjusting the drug release rate to meet practical needs.

[0024] In this embodiment, a limit plate 10 and a filter plate 11 are fixed to the lower end of the tonic tube 6. The space between the limit plate 10 and the filter plate 11 forms a space for mounting the piston 8. Movement of the piston 8 drives the limit plate 10 and the filter plate 11, thereby driving the tonic tube 6. The limit plate 10 and the filter plate 11 are located above and below the piston 8, respectively. The lower end of the tonic tube 6 passes through a central hole defined in the center of the piston 8 and is fixedly connected to the filter plate 11. The output end of the first telescopic device 9 is connected to the filter plate 11. The piston 8 slides axially with the drug release tube 2 but is axially limited by a key. The tonic tube 6 also rotates in a sealed manner with the piston 8. The outer side of the drug release tube 2 is threadedly connected to the inner wall of the support tube 1. Axial movement of the drug release tube 2 allows the two tubes to rotate relative to each other.

[0025] In this embodiment, a blade assembly 12 is mounted on the underside of the filter plate 11. Rotation of the drug release tube 2 allows the blade assembly 12 to agitate the drug within, ensuring uniform drug release and reducing sedimentation. The blade assembly 12 comprises a straight outer blade 13 and an inner blade 14. The inner side of the outer blade 13 forms a notch 15 for sliding engagement with the inner blade 14. The outer blade 13 has an open slot 16 extending along its length. A sliding shaft 17 is fixed to one side of the inner blade 14 and slides within the slot 16. The upper end of the outer blade 13 is fixedly connected to the filter plate 11. The blade assembly 12 can retract axially to accommodate the movement of the piston 8.

[0026] In this embodiment, a sleeve 18 is installed on the outer side of the support tube 1 in a sliding seal. A first elastic support device 19 is installed axially between the sleeve 18 and the support tube 1. The first elastic support device 19 provides an upward elastic support force for the sleeve 18. An annular groove 20 is provided at the lower end of the sleeve 18. A fixed inner conical ring 21 and a movable inner conical ring 22 are arranged in the annular groove 20 at intervals. The outer conical surface of the fixed inner conical ring 21 faces downward, and the outer conical surface of the movable inner conical ring 22 faces upward. The movable inner conical ring 22 is slidably installed on the upper side of the fixed inner conical ring 21. A second elastic support device 23 is connected between the fixed inner conical ring 21 and the movable inner conical ring 22. The lower end of the support tube 1 is connected to a slider 25 via a third elastic support device 24. A wedge-shaped surface 26 is formed on the upper side of the slider 25. The slider 25 slides radially along the support tube 1 and is arranged in a blind groove 27 provided on the outer wall of the support tube 1. By providing the sleeve 18, the support tube 1 can be sealed when the device is not working, preventing impurities or moisture in the soil from entering the support tube 1, thereby playing a protective role.

[0027] Elastic coefficient: first elastic support device 19 > third elastic support device 24 > second elastic support device 23. In the first stage, the sleeve 18 is manually moved downward and the first elastic support device 19 is compressed until the wedge surface 26 of the slider 25 contacts the outer conical surface of the fixed inner conical ring 21. After passing the fixed inner conical ring 21, the slider 25 slides into the gap between the fixed inner conical ring 21 and the movable inner conical ring 22. At this time, the slider 25 is stuck in the gap. Under the limiting action of the upper end face of the fixed inner conical ring 21, the sleeve can no longer move upward. At this time, the sleeve can be completely mounted on the outside of the support tube 1 to play a protective role.

[0028] In the second stage, when the sleeve needs to be removed, the first elastic support device 19 is compressed downward again, and the movable inner conical ring 22 drives the slider 25 to avoid inward. Then the slider 25 is located at the uppermost side of the fixed inner conical ring 21 and the movable inner conical ring 22. After loosening the sleeve, under the elastic support of the first elastic support device 19, the sleeve drives the fixed inner conical ring 21 and the movable inner conical ring 22 to move upward. The slider 25 first compresses the movable inner conical ring 22 downward until it contacts the fixed inner conical ring 21. At this time, the outer cone surface of the movable inner conical ring 22 contacts the outer cone surface of the fixed inner conical ring 21, and can avoid the slider 25. The slider 25 passes through the movable inner conical ring 22 and the fixed inner conical ring 21 in turn and slides to the lower side of the annular groove 20, thereby facilitating the upward movement of the sleeve to achieve disengagement.

[0029] In this embodiment, a cable channel 28 is provided on the inner side of the support tube 1, and a cable 29 is installed in the cable channel 28. The lower end of the cable 29 is connected to an electrode sheet 30, and two electrode sheets 30 form a group. A slideway 31 is coaxially provided at the lower end of the cable channel 28, and a memory alloy tube 32 is slidably provided in the slideway 31. The memory alloy tube 32 is fixedly sleeved on the outer side of the cable 29; a panel 33 is fixed to the lower end of the support tube 1, and a wire feeding device 34 for controlling the extension and retraction of the memory alloy tube 32 is installed on the panel 33. Because soil nematodes have electrotaxis, the present invention can generate microcurrents in the soil by providing at least one group of electrode sheets 30, which can allow the soil nematodes to move faster in the soil and facilitate the degradation of heavy metals in the soil. Of course, after the degradation work is completed, the current can be increased to eliminate some of the soil nematodes, facilitating the subsequent planting of crops. The wire feeding device 34 adopts the existing technology. By setting the memory alloy tube 32 and cooperating with the wire feeding device 34, the electrode sheet 30 can be easily fed into the inside of the soil, which is more conducive to the soil nematodes to penetrate into the interior of the soil to degrade heavy metals.

[0030] In this embodiment, a rotating seat 35 is fixed to one side of the panel 33, and a steering tube is rotatably mounted within the rotating seat 35. The steering tube includes a vertical tube 36, a curved tube 37, and a horizontal tube 38 that are smoothly connected. The lower end of the memory alloy tube 32 passes through the vertical tube 36 and the curved tube 37 in sequence and then exits the horizontal tube 38. The vertical tube 36 of the steering tube is rotatably mounted within the rotating seat 35. The vertical tube 36 is also connected to a rotating drive device 39 that drives it to rotate. The rotating drive device 39 can change the direction of the outer end of the horizontal tube 38, thereby adjusting the extension direction of the memory alloy tube 32. The rotating drive device 39 includes a first gear, a second gear, and a motor. The second gear and the first gear are rotatably matched with the panel 33. The first gear is fixed to the outside of the vertical tube 36, and the second gear is meshed with the first gear. The second gear is driven to rotate by the motor.

[0031] In this embodiment, the lower end of the sleeve 18 is hinged with multiple baffles 40, which can facilitate the protection of the internal structure installed on the baffles 40 when the sleeve 18 is inserted. There is at least a space for the memory alloy tube 32 to pass through between two adjacent baffles 40. Of course, in some other embodiments, when the memory alloy tube 32 is extended, it can also drive the baffles 40 to deflect outward to make way. The multiple baffles 40 are evenly spaced along the circumference of the sleeve 18. The upper ends of the baffles 40 are connected to the sleeve 18 through elastic reset devices 41. The multiple baffles 40 are combined to form a tip; the lower end of the support tube 1 is fixed with a second telescopic device 42, and the output end of the second telescopic device 42 is connected to a retaining ring 43. When the retaining ring 43 is displaced, it can drive the multiple baffles 40 to deflect outward.

[0032] In this embodiment, the system also includes a frame 44, with rollers 45 mounted on the bottom of the frame 44 and a first guide rail 46 mounted on the upper side of the frame 44. The first guide rail 46 is fixedly connected to a second guide rail 48 via a column 47. The second guide rail 48 is mounted parallel to the upper side of the first guide rail 46. A plurality of first slides 49 are slidably mounted on the first guide rail 46. Second slides 50 are slidably mounted on the second guide rail 48 in a one-to-one correspondence with the first slides 49. A motor is fixed to the bottom of the first slide 49, connected to a screw 51. A moving block 52 is threadedly connected to the middle of the screw 51. A guide rod 53 is slidably passed through the moving block 52. The ends of the guide rod 53 and the screw 51 are respectively rotatably connected to the first slide 49 and the second slide 50. The moving block 52 is connected to the support tube 1 via a support plate 54. The plurality of first slides 49 are also connected to an equidistant control structure. The equidistant control structure is used to control the uniform spacing of the multiple support tubes 1, with each moving block 52 corresponding to a group of support tubes 1. Two adjacent groups of moving blocks 52 correspond to two groups of electrode sheets 30 .

[0033] In this embodiment of the present invention, a pin is fixed to each of the first and second slides 49, 50. The pin is mounted at the center of the first and second forks. The first and second forks are connected in an X-shaped configuration, and the first and second forks are connected end to end. The specific connection method is shown in the figure. One of the slides is connected to a hydraulic cylinder. The first slide 49 on the side away from the hydraulic cylinder is fixed to the first guide rail 46. When the hydraulic cylinder controls the displacement of the first slide 49 closest to it, it can drive the multiple first sliders 25 to move at equal intervals, as will be understood by those skilled in the art.

[0034] A method for restoring soil fertility by using soil nematodes, using a system as described in any of the above items. When in use, the agent release tube 2 is located in the support tube 1 and is filled with a soil nematode repair agent. The support tube 1 is then inserted into the soil, and the position of the support tube 1 is adjusted to keep it vertical. The upper end opening of the support tube 1 can be exposed from the soil surface. The agent release tube 2 is controlled to move axially along the support tube 1 by a displacement slow-release device 7. After the agent release tube 2 is displaced, when the first through hole 3 and the second through hole 5 overlap, the soil nematode repair agent can be continuously released into the soil. When the soil nematode repair agent in the agent release tube 2 is insufficient, the soil nematode repair agent is supplemented through the supplementary drug tube 6.

[0035] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A system for restoring soil fertility using soil nematodes, characterized by: It includes a vertical support tube and a drug release tube installed in the support tube with a sliding seal. The drug release tube is filled with a soil nematode remediation agent. The tube wall of the support tube is provided with a plurality of first through holes evenly spaced along the axial direction. A filter screen is installed in the first through hole. A second through hole corresponding to the first through hole is opened on the tube wall of the drug release tube. The upper end of the drug release tube is connected to a tonic tube, which extends from the upper end of the support tube. A displacement slow-release device is connected between the drug release tube and the support tube. The support tube is vertically inserted into the soil. The displacement slow-release device is used to control the axial displacement of the drug release tube along the support tube to realize the release of the soil nematode remediation agent at different depths in the soil.

2. The system for restoring soil fertility using soil nematodes according to claim 1, characterized in that: A piston is installed in a sliding seal at the tube mouth of the medicine release tube, and the piston is connected to a first telescopic device, which is fixed to the inner bottom of the medicine release tube. The first telescopic device can drive the piston to move in the medicine release tube, thereby changing the pressure in the medicine release tube.

3. The system for restoring soil fertility using soil nematodes according to claim 2, characterized in that: The lower end of the tonic tube is fixed with a limit plate and a filter plate at the same time. The space between the limit plate and the filter plate forms a space for installing the piston. The limit plate and the filter plate are located on the upper and lower sides of the piston respectively. The lower end of the tonic tube passes through the center hole opened in the center of the piston and is fixedly connected to the filter plate. The output end of the first telescopic device is connected to the filter plate. The tonic tube is also in rotational sealing cooperation with the piston.

4. The system for restoring soil fertility using soil nematodes according to claim 3, characterized in that: A blade assembly is also installed on the lower side of the filter plate. The blade assembly includes an outer blade and an inner blade in the shape of a straight plate. A groove is formed on the inner side of the outer blade for sliding fit of the inner blade. An open groove is opened on the surface of the outer blade along its length. A sliding shaft is fixed to one side of the inner blade, and the sliding shaft is slidably installed in the open groove; the upper end of the outer blade is fixedly connected to the filter plate.

5. A system for restoring soil fertility using soil nematodes according to any one of claims 1 to 4, characterized in that: The outer sliding seal of the support tube is installed with a sleeve, and a first elastic support device is installed axially with the sleeve and the support tube. A ring groove is provided at the lower end of the sleeve, and a fixed inner cone ring and a movable inner cone ring are arranged at intervals in the ring groove. The outer cone surface of the fixed inner cone ring faces downward, and the outer cone surface of the movable inner cone ring faces upward. The movable inner cone ring is slidably installed on the upper side of the fixed inner cone ring, and a second elastic support device is connected between the fixed inner cone ring and the movable inner cone ring; the lower end of the support tube is connected to a slider through a third elastic support device, and a wedge-shaped surface is formed on the upper side of the slider, and the slider is set in a blind groove provided on the outer wall of the support tube for radial sliding along the support tube.

6. The system for restoring soil fertility using soil nematodes according to claim 5, characterized in that: A cable channel is provided on the inner side of the support tube, in which cables are installed. The lower end of the cable is connected to an electrode sheet, and two electrode sheets form a group. A slide is coaxially provided at the lower end of the cable channel, in which a memory alloy tube is slidably arranged, and the memory alloy tube is fixedly sleeved on the outer side of the cable. A panel is fixed at the lower end of the support tube, and a wire feeding device for controlling the extension and retraction of the memory alloy tube is installed on the panel.

7. The system for restoring soil fertility using soil nematodes according to claim 6, characterized in that: A rotating seat is fixed on one side of the panel, and a steering tube is rotatably installed in the rotating seat. The steering tube includes a vertical tube, a curved tube and a horizontal tube with smooth transition connections. The lower end of the memory alloy tube passes through the vertical tube and the curved tube in sequence and then exits from the horizontal tube. The vertical tube of the steering tube is rotatably installed in the rotating seat, and the vertical tube is also connected to a rotating drive device that drives it to rotate.

8. The system for restoring soil fertility using soil nematodes according to claim 7, characterized in that: The lower end of the sleeve is hinged with multiple baffles, which are evenly spaced along the circumference of the sleeve. The upper ends of the baffles are connected to the sleeve through elastic reset devices, and the multiple baffles are combined to form a tip; the lower end of the support tube is fixed with a second telescopic device, and the output end of the second telescopic device is connected to a retaining ring, which can drive the multiple baffles to deflect outward when the retaining ring is displaced.

9. The system for restoring soil fertility using soil nematodes according to claim 1, characterized in that: The system also includes a frame, a roller is installed at the bottom of the frame, a first guide rail is installed on the upper side of the frame, the first guide rail is fixedly connected to the second guide rail through a column, the second guide rail is installed parallel to the upper side of the first guide rail, a plurality of first slides are slidably installed on the first guide rail, and a second slide is slidably installed on the second guide rail corresponding to the first slide one by one, a motor is fixed on the bottom of the first slide, the motor is connected to a screw, the middle part of the screw is threadedly connected to a moving block, a guide rod is simultaneously slidably penetrated on the moving block, the two ends of the guide rod and the screw are respectively rotatably connected to the first slide and the second slide, and the moving block is connected to the support tube through a support plate; multiple first slides are simultaneously connected to an equidistant control structure.

10. A method for restoring soil fertility using soil nematodes, characterized by: A system as described in any one of claims 1 to 9 is used. When in use, the agent release tube is located inside the support tube and is filled with a soil nematode remediation agent. The support tube is then inserted into the soil, and the position of the support tube is adjusted to keep it vertical so that the upper end opening of the support tube can be exposed from the soil surface. The agent release tube is controlled to move axially along the support tube by a displacement slow-release device. After the agent release tube is displaced, when the first through hole and the second through hole overlap, the soil nematode remediation agent can be continuously released into the soil. When the soil nematode remediation agent in the agent release tube is insufficient, the soil nematode remediation agent is supplemented through the supplementary drug tube.

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