Soil improvement device and method for saline-alkali soil combined with deep application of biogas slurry to field

Abstract

The application belongs to the technical field of saline-alkali soil treatment, and specifically provides a saline-alkali soil improvement equipment and method combined with deep application of biogas slurry. The equipment can form two types of underground channels with different depths simultaneously in one field operation by setting the biogas slurry channel forming mechanism and the salt discharge channel forming mechanism with different shovel tip heights. The shallow biogas slurry channel is used for injecting biogas slurry underground, and the biogas slurry is precisely delivered to the soil where the crop root layer is located through soil penetration, which can not only provide nutrients for crops, but also avoid the surface soil compaction and salt aggregation caused by surface application of biogas slurry, so as to realize safe application of biogas slurry and soil fertilization. The deep salt discharge channel forms an underground salt discharge network, which is used for discharging the dissolved salt with rainwater or irrigation water, so as to reduce the salt content of the soil.

Description

Technical Field

[0001] This application belongs to the field of saline-alkali land management technology, specifically a soil improvement device and method for saline-alkali land by combining deep application of biogas slurry to the field. Background Technology

[0002] Large areas of saline-alkali arable land and arable saline-alkali wasteland are distributed in the arid and semi-arid regions of northern my country. These soils generally have common problems such as compacted structure, low total porosity, poor water permeability and aeration, and difficulty in salt leaching and removal.

[0003] Biogas slurry is a major byproduct of anaerobic fermentation of livestock and poultry manure. Rich in readily available nitrogen, phosphorus, and potassium nutrients, as well as humic acid and beneficial microorganisms, it is an important source of organic fertilizer in integrated crop-livestock farming. Scientific application to the field can effectively improve soil aggregate structure, increase soil organic matter content, and enhance soil fertility. However, in saline-alkali land applications, the traditional surface application method presents significant technical bottlenecks. Biogas slurry has high viscosity, and after surface application, a large amount remains on the soil surface, easily exacerbating surface soil compaction and further reducing soil permeability. Simultaneously, the infiltration process of biogas slurry can easily drive deep-seated salts to the surface, causing soil salt accumulation and further aggravating salinization, directly limiting the resource utilization of biogas slurry in saline-alkali land. Summary of the Invention

[0004] Based on the above-mentioned technical problems, this application provides a soil improvement device and method for saline-alkali land by combining deep application of biogas slurry to the field, so as to solve the technical problem that biogas slurry is difficult to use for saline-alkali land treatment in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, this application provides a soil improvement device for saline-alkali land that combines deep application of biogas slurry to the field, including a frame, a biogas slurry channel forming mechanism disposed on the frame, and a salt discharge channel forming mechanism disposed on the frame and spaced apart from the biogas slurry channel forming mechanism; the arrangement direction of the biogas slurry channel forming mechanism and the salt discharge channel forming mechanism is perpendicular to the forward direction of the frame; The biogas slurry channel forming mechanism and the salt discharge channel forming mechanism each include: A deep loosening shovel includes a shovel column connected to the frame and a shovel tip fixed to the bottom end of the shovel column, the shovel tip being oriented along the forward direction of the frame; and A shaping block is connected to the end of the shovel tip that is away from the forward direction of the frame. The shaping block is a rotating component with a circular cross-section, and one end of the shaping block is connected to the shovel tip through a flexible chain. The tip of the shovel in the biogas slurry channel forming mechanism is higher than the tip of the shovel in the salt discharge channel forming mechanism.

[0006] In one possible implementation, a root-cutting mechanism is also included, which comprises: A rotating shaft is disposed on the frame in a horizontal direction perpendicular to the forward direction of the frame, and is located in front of the biogas slurry channel forming mechanism and the salt discharge channel forming mechanism in the forward direction of the frame; and Multiple cutting blades are spaced apart along the axial direction of the rotating shaft and are fixedly connected to the rotating shaft. The deepest cutting point of the cutting blade is located above the shovel tip of the biogas slurry channel forming mechanism.

[0007] In one possible implementation, multiple biogas slurry channel forming mechanisms are provided along a horizontal direction perpendicular to the forward direction of the frame, and a salt discharge channel forming mechanism is provided between two adjacent biogas slurry channel forming mechanisms. The biogas slurry channel forming mechanism and the salt discharge channel forming mechanism correspond one-to-one with each of the cutting blades of the root cutting mechanism.

[0008] In one possible implementation, a suppression mechanism is also included, the suppression mechanism comprising: A wheel frame, mounted on the frame and positioned behind the biogas slurry channel forming mechanism in the forward direction of the frame, with the wheel frame corresponding one-to-one with the biogas slurry channel forming mechanism; and The pressure roller is rotatably mounted on the wheel frame, and the soil-pressing width of the pressure roller is greater than the soil-breaking width of the deep loosening shovel.

[0009] In one possible implementation, the frame is provided with an adjustment groove in the vertical direction, the top of the wheel frame has a slide rod that slides in cooperation with the adjustment groove, and the pressing mechanism further includes a spring disposed between the wheel frame and the frame.

[0010] In one possible implementation, the shaping block is a spindle shape that is thin at both ends and thick in the middle.

[0011] In one possible implementation, the shovel tip depth of the biogas slurry channel forming mechanism is 30-35 cm, and the shovel tip depth of the salt discharge channel forming mechanism is 60-70 cm.

[0012] In one possible implementation, a traction vehicle for connection to the frame is also included.

[0013] Compared with existing technologies, the beneficial effects of the saline-alkali land soil improvement equipment combined with deep application of biogas slurry to the field provided in this application are: This application utilizes a biogas slurry channel forming mechanism and a salt drainage channel forming mechanism with different shovel tip heights, enabling the equipment to simultaneously form two types of underground channels of varying depths in a single field operation. The shallow biogas slurry channel injects biogas slurry into the ground. The slurry permeates the soil and is precisely delivered to the root zone of crops, providing nutrients while avoiding surface soil compaction and salt accumulation caused by surface application, thus achieving safe return of biogas slurry to the field and soil fertilization. Because the biogas slurry is directly applied underground, the discomfort caused by its odor is reduced. The organic film formed after the biogas slurry dries hardens the inner wall of the channel, preventing collapse and allowing for extended use. The salt drainage channel forms an underground salt drainage network to remove salt dissolved by rainwater or irrigation water, thereby reducing soil salinity.

[0014] In this application, the biogas slurry channel and the salt drainage channel are formed by deep loosening shovels and shaping blocks. The shaping blocks adopt a rotating structure and are connected at the rear end by a flexible chain, so that the inner wall of the channel can remain smooth and intact when the shaping blocks are squeezed and formed in the soil. The floating degree of freedom provided by the flexible chain can compensate for the up and down bumps during the movement of the equipment, thereby forming a continuous and uninterrupted underground channel.

[0015] Secondly, this application provides a method for improving saline-alkali land soil by combining deep application of biogas slurry with soil improvement equipment for saline-alkali land soil improvement using any of the above-mentioned implementation methods, including the following steps: The traction power equipment is controlled to pull the frame forward, so that the deep loosening shovel of the biogas slurry channel forming mechanism and the deep loosening shovel of the salt discharge channel forming mechanism break the soil in sequence, and respectively extrude biogas slurry channel and salt discharge channel in the soil through the shaping blocks connected to them. A biogas slurry delivery pipeline is constructed in the field, connecting to all the biogas slurry channels. Biogas slurry is then delivered into the biogas slurry channels through the biogas slurry delivery pipeline, allowing the biogas slurry to permeate into the soil along the biogas slurry channels. A drainage ditch is constructed in the field, connecting to the drainage channel. Rainfall or irrigation allows water carrying salt from the soil to flow through the drainage channel into the drainage ditch and then be discharged, thereby reducing the soil salinity.

[0016] In one possible implementation, the biogas slurry delivery pipeline is a PVC pipe or an open ditch.

[0017] This application provides a method for improving saline-alkali land by combining deep application of biogas slurry to the field. The equipment for improving saline-alkali land by combining deep application of biogas slurry to the field, which adopts any of the above-mentioned implementation methods, has the same technical effect, and will not be described in detail here. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 Schematic diagram of the structure of the saline-alkali land soil improvement device combined with deep application of biogas slurry to the field provided in the embodiments of this application. Figure 1 ; Figure 2 Schematic diagram of the structure of the saline-alkali land soil improvement device combined with deep application of biogas slurry to the field provided in the embodiments of this application. Figure 2 ; Figure 3 This is a schematic diagram showing the connection between the pressing mechanism and the frame; Figure 4 This is a vertical cross-section of saline-alkali land; Figure 5 This is a horizontal profile of the saline-alkali land at the depth where the biogas slurry channel is located. Figure 6 This is a horizontal cross-section of the saline-alkali land at the depth where the salt drainage channel is located. Explanation of reference numerals in the attached figures: 10. Frame; 20. Biogas slurry channel forming mechanism; 21. Deep loosening shovel; 211. Shovel column; 212. Shovel tip; 22. Shaping block; 23. Flexible chain; 30. Salt discharge channel forming mechanism; 40. Root cutting mechanism; 41. Rotating shaft; 42. Cutting blade; 50. Pressing mechanism; 51. Wheel frame; 511. Slide rod; 52. Pressure roller; 53. Spring; 60. Biogas slurry conveying pipeline; 70. Salt discharge ditch. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0025] Please refer to the following: Figures 1 to 6 The following describes the equipment and method for improving saline-alkali land by combining deep application of biogas slurry with soil improvement provided in the embodiments of this application.

[0026] like Figures 1 to 4 As shown, in a first aspect, embodiments of this application provide a soil improvement device for saline-alkali land combined with deep application of biogas slurry, including a frame 10, a biogas slurry channel forming mechanism 20 disposed on the frame 10, and a salt drainage channel forming mechanism 30 disposed on the frame 10 and spaced apart from the biogas slurry channel forming mechanism 20; the arrangement direction of the biogas slurry channel forming mechanism 20 and the salt drainage channel forming mechanism 30 is perpendicular to the forward direction of the frame 10. The frame 10 can be connected to a traction vehicle such as a tractor, a seeder, or other agricultural machinery, and the traction vehicle can drive the frame 10 to move and drive the frame 10 to lift as a whole.

[0027] The biogas slurry channel forming mechanism 20 and the salt discharge channel forming mechanism 30 have the same structure, including a deep loosening shovel 21 and a shaping block 22, respectively.

[0028] The deep tillage shovel 21 includes a shovel column 211 connected to the frame 10, and a shovel tip 212 fixed to the bottom end of the shovel column 211. The shovel tip 212 faces the forward direction of the frame 10. The shovel column 211 is a vertically arranged columnar component, and its cross-sectional shape can be rectangular, square, or circular. The top end of the shovel column 211 can be detachably connected to the frame 10 by bolts, pins, or clamping, so that different lengths of shovel columns 211 can be replaced or the installation height of the shovel column 211 can be adjusted according to the working depth requirements. The shovel tip 212 is fixed to the bottom end of the shovel column 211, and the shovel tip 212 can be a chisel-shaped structure or an arrow-shaped structure. The shovel tip 212 and the bottom end of the shovel column 211 can be connected by welding, bolts, or integral casting. The shovel tip 212 of the biogas slurry channel forming mechanism 20 is higher than the shovel tip 212 of the salt discharge channel forming mechanism 30.

[0029] The shaping block 22 is connected to the end of the shovel tip 212 opposite to the forward direction of the frame 10. The shaping block 22 is a rotating component with a circular cross-section. One end of the shaping block 22 is connected to the shovel tip 212 via a flexible chain 23. The shaping block 22 is used to compress the soil interior after the deep loosening shovel 21 breaks the soil to form a continuous tubular channel with a circular cross-section. The shaping block 22 can be a bullet-shaped streamlined structure with its small diameter end facing forward and its large diameter end facing backward; or it can be a spindle-shaped structure that is thin at both ends and thick in the middle. The spindle-shaped structure is smoother when entering and exiting the soil, which is beneficial to improving the continuity and integrity of the channel formation.

[0030] The spindle-shaped structure refers to the outer contour of the shaping block 22, which, from front to back, consists of a narrowing front section, a bulging middle section, and a narrowing rear section, giving it an overall shape that is tapered at both ends and full in the middle. The maximum cross-sectional diameter of the shaping block 22 (i.e., the diameter of the bulging middle section) is greater than the soil-breaking width of the tip 212 of the deep loosening shovel 21, to ensure that the shaping block 22 can squeeze out a tubular channel in the soil with a diameter greater than the soil-breaking width of the tip 212.

[0031] The shaping block 22 can be a solid metal component or designed to be hollow to reduce its weight. The shaping block 22 can be made of wear-resistant alloy steel or cast iron. The surface of the shaping block 22 can be polished or have a wear-resistant layer welded on to reduce frictional resistance during the extrusion molding process and extend its service life.

[0032] Compared with the prior art, the beneficial effects of the saline-alkali land soil improvement equipment combined with deep application of biogas slurry to the field provided in this application embodiment are: This embodiment of the application, by setting up a biogas slurry channel forming mechanism 20 and a salt drainage channel forming mechanism 30 with different heights of the shovel tip 212, enables the equipment to simultaneously form two types of underground channels of different depths in a single field operation. The shallow biogas slurry channel is used to inject biogas slurry into the ground. The biogas slurry is precisely delivered to the soil where the crop roots are located after soil infiltration, which can provide nutrients for crops and avoid surface soil compaction and salt accumulation caused by surface application of biogas slurry, thus achieving safe return of biogas slurry to the field and soil fertilization. Since the biogas slurry is directly applied underground, the discomfort caused by the volatilization of biogas slurry odor can be reduced. The organic film formed after the biogas slurry dries can harden the inner wall of the biogas slurry channel, making the biogas slurry channel less prone to collapse and allowing it to be used for a longer period of time. The salt drainage channel forms an underground salt drainage network to drain salt dissolved with rainwater or irrigation water, thereby reducing the soil salinity.

[0033] In this application, the biogas slurry channel and the salt discharge channel are formed by the deep loosening shovel 21 and the shaping block 22. The shaping block 22 adopts a rotating body structure and is connected at the rear end by a flexible chain 23. This allows the shaping block 22 to maintain the smoothness and integrity of the inner wall of the channel when it is squeezed and shaped in the soil. The floating degree of freedom provided by the flexible chain 23 can compensate for the up-and-down bumps during the movement of the equipment, thereby forming a continuous and uninterrupted underground channel.

[0034] Please see Figure 1 To prevent grass roots from getting tangled in the deep loosening shovel 21, this embodiment of the application also includes a root-cutting mechanism 40, which includes a rotating shaft 41 and multiple cutting blades 42. The rotating shaft 41 is disposed on the frame 10 in a horizontal direction perpendicular to the forward direction of the frame 10, and is located in front of the biogas slurry channel forming mechanism 20 and the salt discharge channel forming mechanism 30 in the forward direction of the frame 10; the rotating shaft 41 can be rotatably mounted on the lower front part of the frame 10 via a bearing seat. The rotating shaft 41 can be driven by a drive device (such as a motor) mounted on the frame 10, or it can be driven to rotate by a traction vehicle via a transmission shaft.

[0035] Multiple cutting blades 42 are spaced apart along the axial direction of the rotating shaft 41 and are fixedly connected to the rotating shaft 41. The deepest cutting point of the cutting blade 42 is located above the shovel tip 212 of the biogas slurry channel forming mechanism 20. The cutting blade 42 penetrates the soil to a depth of 15~25cm, which matches the concentrated distribution depth of the root system of weeds on the surface of saline-alkali land. During operation, it cuts the grass roots as the equipment moves forward, effectively cutting off the fibrous roots and horizontal rhizomes of the weeds, and avoiding entanglement with the deep loosening shovel 21 behind it.

[0036] like Figure 1As shown, multiple biogas slurry channel forming mechanisms 20 are provided in a horizontal direction perpendicular to the forward direction of the frame 10, and a salt discharge channel forming mechanism 30 is provided between two adjacent biogas slurry channel forming mechanisms 20; the biogas slurry channel forming mechanism 20 and the salt discharge channel forming mechanism 30 are respectively corresponding to each cutting blade 42 of the root cutting mechanism 40, ensuring that the root stubble area cut by the cutting blade 42 can be accurately covered by the deep loosening shovel 21 behind.

[0037] This embodiment of the application sets up multiple sets of biogas slurry channel forming mechanisms 20 and salt drainage channel forming mechanisms 30, arranged alternately. The equipment can simultaneously form multiple biogas slurry channels and multiple salt drainage channels in a single operation, significantly improving the coverage width and operational efficiency of a single operation. The biogas slurry channels and salt drainage channels are distributed laterally at intervals, allowing the biogas slurry deep application area and the salt drainage area to intersect spatially without interfering with each other, which is beneficial for the coordinated advancement of saline-alkali land improvement and fertilization. The cutting blades 42 of each channel forming mechanism and the root cutting mechanism 40 are corresponding one-to-one, ensuring that each deep loosening shovel 21 has a cutting blade 42 in front to pre-cut the root system, completely avoiding root entanglement problems and ensuring the stability and forming quality of multi-row synchronous operations.

[0038] When the deep loosening shovel 21 breaks through the soil, the shovel column 211 creates a vertical soil fissure as it penetrates the soil layer. This fissure extends from the surface to the depth of the biogas slurry channel. When biogas slurry is transported through the shallow biogas slurry channel, it may seep upwards to the surface along this vertical fissure, causing biogas slurry loss and surface pollution.

[0039] To resolve the above issues, please refer to Figure 1 , Figure 2 and Figure 3 This embodiment of the application also includes a compaction mechanism 50, which includes a wheel frame 51 and a pressure roller 52. The wheel frame 51 is mounted on the frame 10 and is located behind the biogas slurry channel forming mechanism 20 in the forward direction of the frame 10. The wheel frame 51 and the biogas slurry channel forming mechanism 20 are corresponding one-to-one. The pressure roller 52 is rotatably mounted on the wheel frame 51, and the compaction width of the pressure roller 52 is greater than the breaking width of the deep loosening shovel 21. The pressure roller 52 compacts the soil fissures formed after the deep loosening shovel 21 passes, sealing the seepage channels above the biogas slurry channel. The compaction width of the pressure roller 52 is greater than the breaking width of the deep loosening shovel 21, ensuring that the fissures are completely covered and compacted, effectively preventing biogas slurry from seeping upwards along the fissures.

[0040] The frame 10 has an adjustment groove along its vertical direction. The top of the wheel frame 51 has a sliding rod 511 that slides in conjunction with the adjustment groove. The compaction mechanism 50 also includes a spring 53 located between the wheel frame 51 and the frame 10. The spring 53 is a cylindrical helical spring 53, which is always under compression, providing preload force for the pressure roller 52 to compact the soil downwards. The sliding rod 511 passes through the adjustment groove and can slide up and down along it. The spring 53 and the sliding rod 511 together form an elastic buffer structure that can adapt to surface undulations. If necessary, an anti-detachment stop, such as a stop bar or block, can be installed at the top of the sliding rod 511 to prevent the sliding rod 511 from detaching from the adjustment groove. The setting and installation of the stop are existing technologies and will not be described in detail here.

[0041] The shovel tip 212 of the biogas slurry channel forming mechanism 20 has a depth of 30-35 cm. This depth range matches the main root layer distribution depth of most dryland crops, so that the formed biogas slurry channel is located in the dense root area of ​​the crop, and the readily available nutrients and organic matter in the biogas slurry can be efficiently absorbed and utilized by the crop roots.

[0042] The shovel tip 212 of the salt drainage channel forming mechanism 30 has a depth of 60-70 cm. This depth range corresponds to the core depth of salt leaching in saline-alkali land. It can form a deep underground drainage network during rainfall or irrigation. Rainwater carries soil salts out through the salt drainage channel, effectively reducing the salt content of the topsoil.

[0043] Please see Figures 1 to 6 Secondly, embodiments of this application provide a method for improving saline-alkali land by combining deep application of biogas slurry with soil remediation. The method utilizes the aforementioned equipment for improving saline-alkali land by combining deep application of biogas slurry with soil remediation, and includes the following steps: The traction power equipment pulls the frame 10 forward, causing the deep loosening shovel 21 of the biogas slurry channel forming mechanism 20 and the deep loosening shovel 21 of the salt drainage channel forming mechanism 30 to break the soil in sequence. The shovel 21, along with its corresponding shaped block 22, then extrudes and shapes the biogas slurry channel and salt drainage channel within the soil. In this step, the equipment can simultaneously complete the forming of both channels in a single pass. The tip 212 of the deep loosening shovel 21 breaks through compacted soil and breaks up the plow pan, after which the shaped block 22 extrudes and shapes a continuous tubular channel within the soil. The biogas slurry channel is 30–35 cm deep, and the salt drainage channel is 60–70 cm deep.

[0044] A biogas slurry delivery pipeline 60 is constructed in the field, connecting to all biogas slurry channels. The biogas slurry delivery pipeline 60 can be a PVC pipe or an open ditch. Biogas slurry is transported into the biogas slurry channels through the biogas slurry delivery pipeline 60, allowing the biogas slurry to permeate into the soil along the channels. One end of the biogas slurry delivery pipeline 60 is connected to the biogas slurry source (such as a biogas slurry storage tank or biogas slurry transport vehicle), and the other end is connected to the port of each biogas slurry channel. Biogas slurry can enter the biogas slurry channels by gravity flow or by pumping and pressurizing.

[0045] A drainage ditch 70 is constructed in the field, connecting to the drainage channel. Rainfall or irrigation allows water carrying salt from the soil to flow through the drainage channel into the drainage ditch 70 and then drain, thus reducing the soil salinity. The drainage ditch 70 can be an open ditch dug along the edge of the field, with a depth greater than that of the drainage channel, to ensure that water from the drainage channel can flow smoothly into it.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A soil improvement device for saline-alkali land combining deep application of biogas slurry, characterized in that, It includes a frame (10), a biogas slurry channel forming mechanism (20), and a salt discharge channel forming mechanism (30) spaced apart from the biogas slurry channel forming mechanism (20); the arrangement direction of the biogas slurry channel forming mechanism (20) and the salt discharge channel forming mechanism (30) is perpendicular to the forward direction of the frame (10); The biogas slurry channel forming mechanism (20) and the salt discharge channel forming mechanism (30) respectively include: A deep loosening shovel (21) includes a shovel column (211) connected to the frame (10) and a shovel tip (212) fixed to the bottom end of the shovel column (211), the shovel tip (212) being oriented along the forward direction of the frame (10); and A shaping block (22) is connected to one end of the shovel tip (212) away from the forward direction of the frame (10). The shaping block (22) is a rotating component with a circular cross-section. One end of the shaping block (22) is connected to the shovel tip (212) through a flexible chain (23). The tip (212) of the biogas slurry channel forming mechanism (20) is higher than the tip (212) of the salt discharge channel forming mechanism (30).

2. The soil improvement equipment for saline-alkali land combined with deep application of biogas slurry to the field according to claim 1, characterized in that, It also includes a root-cutting mechanism (40), which includes: A rotating shaft (41) is disposed on the frame (10) in a horizontal direction perpendicular to the forward direction of the frame (10), and is located in front of the biogas slurry channel forming mechanism (20) and the salt discharge channel forming mechanism (30) in the forward direction of the frame (10); and Multiple cutting blades (42) are spaced apart along the axial direction of the rotating shaft (41) and are fixedly connected to the rotating shaft (41). The deepest cutting point of the cutting blade (42) is located above the shovel tip (212) of the biogas channel forming mechanism (20).

3. The soil improvement equipment for saline-alkali land combined with deep application of biogas slurry to the field according to claim 2, characterized in that, The biogas slurry channel forming mechanism (20) is provided in multiple horizontal directions perpendicular to the forward direction of the frame (10), and the salt discharge channel forming mechanism (30) is provided between two adjacent biogas slurry channel forming mechanisms (20). The biogas slurry channel forming mechanism (20) and the salt discharge channel forming mechanism (30) correspond one-to-one with each of the cutting blades (42) of the root cutting mechanism (40).

4. The soil improvement equipment for saline-alkali land combined with deep application of biogas slurry to the field according to claim 1, characterized in that, It also includes a pressing mechanism (50), which includes: A wheel frame (51) is provided on the frame (10) and is located behind the biogas slurry channel forming mechanism (20) in the forward direction of the frame (10). The wheel frame (51) and the biogas slurry channel forming mechanism (20) are corresponding one-to-one. The pressure roller (52) is rotatably mounted on the wheel frame (51), and the pressing width of the pressure roller (52) is greater than the breaking width of the deep loosening shovel (21).

5. The soil improvement equipment for saline-alkali land combined with deep application of biogas slurry to the field according to claim 4, characterized in that, The frame (10) is provided with an adjustment groove along the vertical direction, and the top of the wheel frame (51) has a slide rod (511) that slides with the adjustment groove. The pressing mechanism (50) also includes a spring (53) located between the wheel frame (51) and the frame (10).

6. The soil improvement equipment for saline-alkali land combined with deep application of biogas slurry to the field according to claim 1, characterized in that, The shaping block (22) is spindle-shaped with thin ends and thick middle.

7. The soil improvement equipment for saline-alkali land combined with deep application of biogas slurry to the field according to claim 1, characterized in that, The depth of the shovel tip (212) of the biogas slurry channel forming mechanism (20) is 30-35 cm, and the depth of the shovel tip (212) of the salt discharge channel forming mechanism (30) is 60-70 cm.

8. The soil improvement equipment for saline-alkali land combined with deep application of biogas slurry to the field according to claim 1, characterized in that, It also includes a traction vehicle for connection to the frame (10).

9. A method for improving saline-alkali land soil by combining deep application of biogas slurry with soil improvement, using the saline-alkali land soil improvement equipment for combining deep application of biogas slurry with soil improvement as described in any one of claims 1 to 8, characterized in that, Includes the following steps: The traction power equipment is controlled to pull the frame (10) forward, so that the deep loosening shovel (21) of the biogas slurry channel forming mechanism (20) and the deep loosening shovel (21) of the salt discharge channel forming mechanism (30) break the soil in sequence, and respectively extrude biogas slurry channel and salt discharge channel in the soil through the shaping block (22) connected to them. A biogas slurry delivery pipeline (60) is constructed in the field and connected to all the biogas slurry channels. Biogas slurry is delivered to the biogas slurry channels through the biogas slurry delivery pipeline (60) so that the biogas slurry can permeate into the soil along the biogas slurry channels. A drainage ditch (70) is constructed in the field and connected to the drainage channel. Water carrying salt from the soil is discharged through the drainage channel into the drainage ditch (70) by rain or irrigation, thereby reducing the soil salinity.

10. The method for improving saline-alkali land soil by combining deep application of biogas slurry with soil improvement according to claim 9, characterized in that, The biogas slurry delivery pipeline (60) is a PVC pipe or an open ditch.

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