A device and method for improving acidic soil

Abstract

This invention discloses an acidic soil improvement device and method, belonging to the field of soil improvement technology. The invention achieves long-term, self-regulating improvement of acidic soils by constructing a composite system for acidic soil improvement that synergistically integrates pH-sensitive microcapsules, functional microorganisms, and a biochar carrier. The composite system naturally forms concentric stratified micro-reaction units within soil microzones. Under acidic conditions, the microcapsules slowly release alkaline substances to neutralize hydrogen ions, while the functional microorganisms, supported by the biochar carrier, stably colonize and continuously regulate the soil pH through inducing calcium carbonate precipitation and rhizosphere synergistic effects. The accompanying execution unit enables targeted, precise, and quantitative application of the improvement system, enhancing its engineering application capabilities.

Description

Technical Field

[0001] This invention relates to the field of soil improvement technology, specifically to an equipment and method for improving acidic soil. Background Technology

[0002] In the long-term process of agricultural production, farmland soil is prone to acidification due to factors such as continuous application of chemical fertilizers, acid rain input, and ion exchange in the crop rhizosphere. Soil acidification not only leads to an increase in the concentration of hydrogen ions in the soil, but also triggers the activation of aluminum ions, which hinders crop root growth and reduces nutrient absorption efficiency, thereby affecting agricultural yield and the sustainable use capacity of the soil. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: a method for improving acidic soil, comprising the following steps: Step 1, preparing pH-sensitive microcapsules, wherein the pH-sensitive microcapsules are composed of an acid-sensitive polymer shell and an alkaline core material encapsulated inside the acid-sensitive polymer shell; Step 2, screening and culturing functional microorganisms suitable for survival in acidic soil environments, wherein the functional microorganisms include calcium carbonate-producing microorganisms and mycorrhizal fungi; wherein the calcium carbonate-producing microorganisms are used to induce the formation of calcium carbonate precipitate in the soil, and the mycorrhizal fungi are used to improve the rhizosphere environment of crops and mitigate the adverse effects of aluminum ion activation; Step 3, providing a biochar carrier, and loading the pH-sensitive microcapsules obtained in Step 1 and the functional microorganisms obtained in Step 2 onto the biochar carrier to form a concentric layered structure for improving acidic soil. The system comprises a composite system; in which the biochar carrier is used to carry, slowly release, and stabilize pH-sensitive microcapsules and functional microorganisms; the acid soil improvement composite system is not a single material form, but a concentric layered micro-reaction unit structure that naturally forms in the soil micro-zone after application, with the biochar carrier as the outer structure, functional microorganisms as the middle active layer, and pH-sensitive microcapsules as the core triggering layer; Step 4: The acid soil improvement composite system is applied to the surface layer and / or rhizosphere of acidic soil in agricultural land through the execution unit; Step 5: Under the action of the natural acidic environment of the soil, the acid-sensitive polymer shell degrades, releasing alkaline core substances to neutralize excess hydrogen ions in the soil; at the same time, the functional microorganisms gradually colonize under the support of the biochar carrier, and continuously participate in the regulation of soil pH through calcium carbonate precipitation and rhizosphere synergy; Step 6: Through the release of pH-sensitive microcapsules, the continuous metabolic action of functional microorganisms, and the buffering and adsorption effect of biochar carrier, the acidic soil gradually forms a stable acid-base buffer system, achieving long-term, mild acid soil improvement.

[0004] Preferably, the alkaline core material in step 1 includes calcium carbonate, magnesium oxide, or a combination thereof; the acid-sensitive polymer shell is a polymer material that undergoes structural degradation in an acidic environment, so that the alkaline core material is released under soil acidification conditions.

[0005] Preferably, the execution unit in step 4 includes a pressing assembly and a feeding assembly; wherein the pressing assembly is composed of multiple axially stacked and fixed pressing discs, the pressing discs include a disc housing and a cover plate, the cover plate is fixed on the disc housing, and multiple pressing pin sleeves are fixed at the circumferential edge of the inner side of the disc housing, and a pressing pin is slidably inserted into each pressing pin sleeve along the radial direction of the disc housing, and the end of the pressing pin located on the outer side of the disc housing is sharp.

[0006] Preferably, the circumferential edge of the disc housing is provided with a plurality of first positioning perforations, and the circumferential surface of the cover plate is provided with a number of second positioning perforations equal to the number of first positioning perforations, and the positions of each first positioning perforation and the second positioning perforation are coaxially aligned.

[0007] Preferably, the feeding assembly includes a feeding cylinder fixed on a push-pull bracket. The top of the feeding cylinder is provided with a feeding channel, and the bottom of the feeding cylinder is provided with a feeding hole. A feeding body is rotatably arranged inside the feeding cylinder. Multiple feeding grooves are evenly opened on the circumferential surface of the feeding body, wherein the circumferential surface of the feeding body is in contact with the inner wall surface of the feeding cylinder.

[0008] Preferably, the feeding assembly further includes a storage tank bracket fixed on the push-pull bracket. The storage tank bracket is fixed with a storage tank for storing the acid soil improvement composite system. The bottom of the storage tank is connected to the feeding channel for injecting the acid soil improvement composite system into the distribution tank on the distribution body.

[0009] Preferably, baffle plates are slidably inserted at both ends of the feeding channel along its length. The two baffle plates are used to control the effective cross-sectional area of ​​the feeding channel. Two permanent magnets are magnetically attached to the outer surface of the distributing cylinder, and the two permanent magnets are magnetically attracted and frictionally engaged with the corresponding baffle plates.

[0010] Preferably, a main motor for driving the material distribution body inside the distribution cylinder to rotate is fixedly installed on the push-pull bracket, and a cylindrical brush is also rotatably mounted on the push-pull bracket, driven by an auxiliary motor fixed on the push-pull bracket. The distribution cylinder is positioned between the side support plate and the cylindrical brush.

[0011] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention uses pH-sensitive microcapsules so that the alkaline core material is not released as a whole at the beginning of application, but only when the soil is acidic for a long time and the hydrogen ion concentration reaches the trigger threshold, the acid-sensitive polymer shell degrades and slowly releases the material. The responsive release mechanism with the actual acidification state of the soil as the trigger condition makes the neutralization reaction limited to the acidified micro-zone, effectively avoiding the problems of local strong alkalization, drastic pH fluctuations or even secondary salinization caused by the one-time application of traditional lime and carbonate materials, and fundamentally improving the safety and controllability of the acid soil improvement process; (2) The present invention combines pH-sensitive microcapsules, functional microorganisms and biochar carriers in a synergistic way, so that they naturally form concentric layered micro-reaction units in the soil with biochar as the outer layer, functional microorganisms as the middle layer and microcapsules as the core layer. On a spatial scale, a continuous chain of trigger-reaction-buffering is realized, enabling chemical neutralization reaction, microbial metabolic reaction and physical buffer adsorption process to occur synergistically in the same micro-region, thereby significantly improving the improvement efficiency per unit dosage and realizing the transformation of acid regulation from short-term intervention to long-term self-regulation; (3) Unlike the method of neutralizing acidity by relying solely on exogenous alkaline substances, this invention uses calcium carbonate-producing microorganisms to stably colonize under the support of the porous structure of biochar, and continuously induces in-situ precipitation of calcium carbonate in the soil micro-region through metabolic activities. This precipitation process can not only continuously consume acidic ions in the soil solution, but also fix aluminum ions that are activated in large quantities due to the decrease in pH in acidic soil, thereby simultaneously weakening the inhibitory effect of aluminum toxicity on crop roots at both the chemical and biological levels, and significantly improving the rhizosphere ecological environment; (4) This invention utilizes the structural advantages of porous biochar carriers, large specific surface area and strong surface buffering properties to provide a stable attachment and survival microenvironment for functional microorganisms, enabling them to gradually complete colonization and survive for a long time under acidic soil conditions. Compared with directly adding microbial agents to the soil, this invention significantly reduces the problem of rapid inactivation of functional microorganisms due to acid stress and environmental fluctuations, thereby ensuring that the microbial-induced calcium carbonate precipitation and mycorrhizal synergistic effect can continue to exert their effects over a longer time scale; (5) Through the linkage between the pore pressing component and the feeding component, the present invention enables the acid soil improvement composite system to simultaneously complete the fixed-point pore pressing, quantitative feeding and soil covering operations during the process of travel. By adjusting the extension of the pore pressing pin, it is possible to flexibly choose to act only on the soil surface or directly on the rhizosphere, avoiding the problem of ineffective accumulation of improvement materials on the surface or uneven burial depth. Attached Figure Description

[0012] Figure 1 This is a diagram of the acidic soil improvement equipment of the present invention.

[0013] Figure 2 This is a diagram showing the installation layout of the vibrator of the present invention.

[0014] Figure 3 This is a schematic diagram of the material distribution structure of the present invention.

[0015] Figure 4 This is a schematic diagram of the material feeding hole structure of the present invention.

[0016] Figure 5 This is a schematic diagram of the rotary pressure plate assembly structure of the present invention.

[0017] Figure 6 This is a schematic diagram of the internal structure of the pressure plate of the present invention.

[0018] In the diagram: 101-Disc housing; 102-Pressing pin sleeve; 103-Pressing pin; 104-First positioning through hole; 105-Adjusting disc; 106-Adjusting slide; 107-Sliding pin; 108-Cover plate; 109-Second positioning through hole; 110-Stud rod; 111-Adjusting disc fixing nut; 201-Side support disc; 202-Central spindle; 203-Bolt rod; 204-Nut; 301-Material distribution. 302-Cylinder; 303-Distribution body; 304-Distribution trough; 305-Discharge hole; 306-Transmission belt; 307-Feeding channel; 308-Baffle plate; 309-Storage trough; 310-Vibrating rod; 311-Louvre baffle; 312-Storage trough bracket; 401-Wheel set; 402-Push-pull bracket; 403-Traction head; 404-Main motor; 405-Auxiliary motor; 406-Cylindrical brush. Detailed Implementation

[0019] The following is in conjunction with the appendix Figures 1-6 The technical solution of the present invention will be further illustrated through specific embodiments.

[0020] This invention provides a method for improving acidic soil, comprising the following steps: Step 1, preparing pH-sensitive microcapsules, wherein the pH-sensitive microcapsules consist of an acid-sensitive polymer shell and an alkaline core material encapsulated within the acid-sensitive polymer shell; Step 2, screening and culturing functional microorganisms suitable for survival in acidic soil environments, wherein the functional microorganisms include calcium carbonate-producing microorganisms and mycorrhizal fungi; wherein the calcium carbonate-producing microorganisms are used to induce the formation of calcium carbonate precipitate in the soil, and the mycorrhizal fungi are used to improve the rhizosphere environment of crops and mitigate the adverse effects of aluminum ion activation; Step 3, providing a biochar carrier, and combining the pH-sensitive microcapsules obtained in Step 1 with... The functional microorganisms obtained in step 2 are loaded onto a biochar carrier to form a concentrically layered acidic soil amendment composite system. The biochar carrier carries, slowly releases, and stabilizes the pH-sensitive microcapsules and functional microorganisms. The acidic soil amendment composite system is not a single material form, but rather a concentrically layered micro-reaction unit structure that naturally forms within the soil micro-zone after application, with the biochar carrier as the outer layer, functional microorganisms as the intermediate active layer, and pH-sensitive microcapsules as the core triggering layer. Step 4 involves applying the acidic soil amendment composite system to the surface layer and / or rhizosphere of acidic soil in agricultural land via an execution unit. Step 5: Under the influence of the naturally acidic soil environment, the acid-sensitive polymer shell degrades, releasing alkaline core substances to neutralize excess hydrogen ions in the soil. Simultaneously, functional microorganisms, supported by biochar carriers, gradually colonize and continuously participate in soil pH regulation through calcium carbonate precipitation and rhizosphere synergy. In a naturally acidic soil environment, the concentration of hydrogen ions in the soil solution continuously increases. When this acidic condition acts on the pH-sensitive microcapsules, the acid-sensitive polymer shell, due to its selective chemical structure response to the acidic environment, gradually degrades or destabilizes, thus allowing the slowly released alkaline core substances encapsulated within. The released alkaline core substances neutralize the hydrogen ions enriched in the soil, reducing local micro-zone acidity and inhibiting further acidification. Simultaneously, supported by the porous structure and surface buffering properties of the biochar carrier, functional microorganisms gradually colonize and stabilize in the soil micro-zones. On one hand, they induce in-situ precipitation of calcium carbonate within the micro-zones through metabolic activity, continuously consuming acidic ions and fixing activated aluminum ions at a chemical level. On the other hand, they improve the rhizosphere microenvironment and enhance the soil system's acid-base buffering capacity through synergistic effects with crop roots, thereby achieving continuous, self-regulating improvement of acidic soil over time. Step 6: Through the release of pH-sensitive microcapsules, the continuous metabolic activity of functional microorganisms, and the buffering and adsorption effects of the biochar carrier, a stable acid-base buffering system is gradually formed in the acidic soil, achieving long-term, mild improvement of acidic soil. The alkaline core substances in Step 1 include calcium carbonate, magnesium oxide, or a combination thereof; the acid-sensitive polymer shell is a polymer material that undergoes structural degradation under acidic conditions, allowing the alkaline core substances to be released under soil acidification conditions.The outer shell is composed of an acid-sensitive polymer shell, with calcium carbonate powder (alkaline core substance) inside. In normal or weakly acidic soil (pH≈6.5), the acid-sensitive polymer shell structure is stable, the microcapsules remain intact, and the calcium carbonate is not released. When the soil continues to acidify (pH≈4.5), the number of hydrogen ions in the soil increases, the chemical bonds of the acid-sensitive polymer shell break or swell and disintegrate, the shell breaks on its own, and the calcium carbonate inside is gradually released to neutralize the surrounding acidity.

[0021] The execution unit in step 4 includes a pressing assembly and a feeding assembly; the pressing assembly consists of multiple pressing discs stacked and fixed together axially. Each pressing disc includes a disc housing 101 and a cover plate 108. The cover plate 108 is fixed to the disc housing 101. Multiple pressing pin sleeves 102 are fixed to the circumferential edge of the inner side of the disc housing 101. A pressing pin 103 is slidably inserted into each pressing pin sleeve 102 along the radial direction of the disc housing 101. The end of the pressing pin 103 located on the outer side of the disc housing 101 is pointed, and a sliding pin 107 is fixed to the end of the pressing pin 103 located on the inner side of the disc housing 101. A screw is fixed at the center position on the inner side of the disc housing 101. A stud rod 110 is rotatably fitted with an adjusting disc 105. An adjusting disc fixing nut 111 is threaded onto the stud rod 110, which secures the adjusting disc 105 within the disc housing 101. The inner wall of the disc housing 101 and the contact surface with the adjusting disc 105 are provided with interlocking protrusions. The adjusting disc 105 also has inclined adjusting grooves 106 (inclined radially relative to the adjusting disc 105). The number of adjusting grooves 106 is the same as the number of pressure pins 103, and each pressure pin 103 has a corresponding sliding pin 107 located in the corresponding adjusting groove 106 and capable of sliding. The circumferential edge of the disc housing 101 has multiple first positioning holes 104, and the circumferential surface of the cover plate 108 has the same number of second positioning holes 109 as the first positioning holes 104. The positions of each first positioning hole 104 and each second positioning hole 109 are coaxially aligned. The pressing assembly also includes two symmetrically arranged side support plates 201. A central spindle 202 is fixed at the axial position of each of the two side support plates 201. The two central spindles 202 are rotatably mounted on the push-pull bracket 402. Bolt rods 203 are inserted through the second positioning through holes 109 and the first positioning through holes 104 corresponding to all the pressing plates. Nuts 204 are threaded onto both ends of all the bolt rods 203. All the pressing plates are fixed between the two side support plates 201 by the bolt rods 203 and the nuts 204, forming a coaxial rotating body.

[0022] The feeding assembly includes a feeding cylinder 301 fixed on a push-pull bracket 402. The top of the feeding cylinder 301 is equipped with a feeding channel 306, and the bottom of the feeding cylinder 301 has a feeding hole 304. A feeding body 302 is rotatably disposed inside the feeding cylinder 301. Multiple feeding grooves 303 are evenly distributed on the circumferential surface of the feeding body 302, and the circumferential surface of the feeding body 302 contacts and engages with the inner wall surface of the feeding cylinder 301. The central spindle 202 on the pressing assembly is synchronously driven by the feeding body 302 inside the feeding cylinder 301 via a transmission belt 305. The transmission belt 305 is connected to two pulleys, and the pulley connected to the central spindle 202 is fixed to the central spindle 202 in a manner that facilitates disassembly. The feeding assembly also includes a storage trough bracket 312 fixed on the push-pull bracket 402. A storage trough 309 for storing the acidic soil amendment composite system is fixed on the storage trough bracket 312. The bottom of the storage trough 309 is connected to the feeding channel 306 for injecting the acidic soil amendment composite system into the distributing trough 303 on the distributing body 302. Two baffle plates 307 are slidably inserted at both ends of the feeding channel 306 along its length. The two baffle plates 307 are used to control the effective cross-sectional area of ​​the feeding channel 306. Two permanent magnets 308 are magnetically attached to the outer surface of the distributing cylinder 301. The two permanent magnets 308 magnetically attract and rub against the corresponding baffle plates 307, thus fixing the baffle plates 307 in place. Multiple vibrating rods 310 are fixed vertically on the inner wall of the storage trough 309. Each vibrating rod 310 has a built-in vibration generator, which causes the vibrating rods 310 to oscillate within the storage trough 309, thereby causing the acidic soil amendment composite system inside the storage trough 309 to relax and vibrate, increasing the fluidity of the acidic soil amendment composite system within the storage trough 309. A push-pull louvered baffle 311 is provided at the top of the storage trough 309. Four wheel sets 401 are rotatably mounted on the push-pull bracket 402. A traction head 403 is fixed to one end of the push-pull bracket 402, which is used to connect to a towing mechanism, such as a tractor or other power traction component. A main motor 404 for driving the rotation of the material distribution body 302 inside the material distribution cylinder 301 is fixedly installed on the push-pull bracket 402. A cylindrical brush 406 is also rotatably mounted on the push-pull bracket 402, and the cylindrical brush 406 is driven by an auxiliary motor 405 fixed on the push-pull bracket 402. The material distribution cylinder 301 is located between the side support plate 201 and the cylindrical brush 406.

[0023] The entire unit is towed across the land using a traction assembly, with wheel set 401 providing support. The main motor 404 and auxiliary motor 405 are activated. The main motor 404 rotates the distribution body 302, while the acidic soil amendment composite system inside the storage trough 309 flows through the feed channel 306 into the distribution trough 303. Two baffles 307 adjust the actual flow rate of the acidic soil amendment composite system through the feed channel 306. As the distribution body 302 rotates, the acidic soil amendment composite system in the distribution trough 303 also rotates. Simultaneously, the next row of distribution troughs 303 on the surface of the distribution body 302 rotates to align with the feed channel 306, at which point the acidic soil amendment composite system in the storage trough 309 continues to flow through the feed channel 306 into the distribution trough 303. When the distribution trough 303 rotates to the position of the discharge hole 304, the acidic soil amendment composite system in the distribution trough 303 falls under the influence of gravity.

[0024] As the distribution body 302 rotates, the transmission belt 305 drives the central spindle 202 to rotate. The central spindle 202 drives the side support discs 201 to rotate, and all the pressure discs between the two side support discs 201 rotate synchronously. The pressure pins 103 on the pressure discs press out recesses on the soil surface corresponding to the distribution trough 303. The acidic soil improvement composite system that previously fell from the discharge hole 304 will fall into the recesses formed by the pressure pins 103 on the soil surface. Some of it will not fall into the recesses. At this time, the rotating cylindrical brush 406 will... Rotating the brush to sweep the soil surface (it should be noted that a cylindrical brush 406 with varying density is selected at this time) will cause the acid soil amendment composite system to move on the soil surface. At the same time, it will cause the soil to cover the depressions formed by the pressure pin 103. The acid soil amendment composite system that falls into the depressions formed by the pressure pin 103 will be covered by the soil. The acid soil amendment composite system that does not fall into the depressions formed by the pressure pin 103 will remain on the soil surface. In this way, the acid soil amendment composite system will be present in the soil surface layer and / or the rhizosphere area.

[0025] If the acidic soil amendment compound system is applied only to the surface layer of the soil, the pressure pin 103 needs to be retracted into the housing 101. If the acidic soil amendment compound system is applied only to the rhizosphere, the pressure pin 103 needs to be extended beyond the housing 101. The extension length depends on the depth of the rhizosphere layer. At the same time, a cylindrical brush 406 with a larger density needs to be replaced to remove the acidic soil amendment compound system remaining on the soil surface (increased density will cause more acidic soil amendment compound system to enter the recessed holes formed by the pressure pin 103, and the part that does not enter will be pushed away by the cylindrical brush 406. Finally, depending on the amount of residual acidic soil amendment compound system, the remaining acidic soil amendment compound system on the soil surface can be cleaned up).

[0026] Adjustment of the protrusion of the pressure pin 103 on the disc housing 101: Before fixing all the pressure discs together, adjustment is required. Specifically, remove the cover plate 108 from the disc housing 101, loosen it, rotate the adjustment disc 105, and the adjustment groove 106 will rotate with the adjustment disc 105. At this time, the sliding pin 107 will slide in the adjustment groove 106, thereby driving the corresponding pressure pin 103 to move radially on the disc housing 101, extending or retracting. After the adjustment is completed, tighten the adjustment disc fixing nut 111 to fix the adjustment disc 105 and the disc housing 101 together. Finally, reset the cover plate 108.

Claims

1. A method for improving acid soil, characterized by, Includes the following steps: Step 1: Prepare pH-sensitive microcapsules. The pH-sensitive microcapsules consist of an acid-sensitive polymer shell and an alkaline core material encapsulated inside the acid-sensitive polymer shell. Step 2: Screen and cultivate functional microorganisms suitable for survival in acidic soil environments. These functional microorganisms include calcium carbonate-producing microorganisms and mycorrhizal fungi. Calcium carbonate-producing microorganisms are used to induce the formation of calcium carbonate precipitates in the soil, while mycorrhizal fungi are used to improve the rhizosphere environment of crops and mitigate the adverse effects of aluminum ion activation. Step 3: Provide a biochar carrier, and load the pH-sensing microcapsules obtained in Step 1 and the functional microorganisms obtained in Step 2 onto the biochar carrier to form a concentric layered acidic soil improvement composite system. Step 4: Apply the acid soil amendment composite system to the surface layer and / or rhizosphere of acid soil in agricultural land through the implementation department; Step 5: Under the influence of the natural acidic environment of the soil, the acid-sensitive polymer shell degrades, releasing alkaline core substances to neutralize excess hydrogen ions in the soil. Meanwhile, functional microorganisms gradually colonize under the support of biochar carriers, and continuously participate in soil pH regulation through calcium carbonate precipitation and rhizosphere synergy. Step 6: Through the release of pH-sensitive microcapsules, the continuous metabolic action of functional microorganisms, and the buffering and adsorption effect of biochar carriers, acidic soil gradually forms a stable acid-base buffer system.

2. The method for improving an acid soil according to claim 1, characterized by: The alkaline core material in step 1 includes calcium carbonate, magnesium oxide, or a combination thereof; the acid-sensitive polymer shell is a polymer material that undergoes structural degradation in an acidic environment, so that the alkaline core material is released under soil acidification conditions.

3. The equipment used in the acidic soil improvement method according to claim 1, characterized in that: The execution unit in step 4 includes a pressing assembly and a feeding assembly; wherein the pressing assembly consists of multiple axially stacked and fixed pressing discs, the pressing discs include a disc housing (101) and a cover plate (108), the cover plate (108) is fixed on the disc housing (101), and multiple pressing pin sleeves (102) are fixed at the circumferential edge of the inner side of the disc housing (101), and a pressing pin (103) is slidably inserted into each pressing pin sleeve (102) along the radial direction of the disc housing (101), and the end of the pressing pin (103) located on the outer side of the disc housing (101) is sharp.

4. The equipment used in the acidic soil improvement method according to claim 3, characterized in that: The circumferential edge of the disc housing (101) is provided with a plurality of first positioning through holes (104), and the circumferential surface of the cover plate (108) is provided with the same number of second positioning through holes (109) as the first positioning through holes (104). The positions of each first positioning through hole (104) and second positioning through hole (109) are coaxially aligned.

5. The equipment used in the acidic soil improvement method according to claim 4, characterized in that: The feeding assembly includes a feeding cylinder (301) fixed on a push-pull bracket (402). The top of the feeding cylinder (301) is provided with a feeding channel (306), and the bottom of the feeding cylinder (301) is provided with a feeding hole (304). A feeding body (302) is rotatably arranged inside the feeding cylinder (301). Multiple feeding grooves (303) are evenly opened on the circumferential surface of the feeding body (302), wherein the circumferential surface of the feeding body (302) is in contact with the inner wall surface of the feeding cylinder (301).

6. The equipment used in the acidic soil improvement method according to claim 5, characterized in that: The feeding assembly also includes a storage tank bracket (312) fixed on the push-pull bracket (402). The storage tank bracket (312) is fixed with a storage tank (309) for storing the acid soil improvement composite system. The bottom of the storage tank (309) is connected to the feeding channel (306) for injecting the acid soil improvement composite system into the distribution tank (303) on the distribution body (302).

7. The equipment used in the acidic soil improvement method according to claim 6, characterized in that: Both ends of the feeding channel (306) are slidably inserted with baffle plates (307). The two baffle plates (307) are used to control the effective cross-sectional area of ​​the feeding channel (306). Two permanent magnets (308) are magnetically attached to the outer surface of the distributing cylinder (301). The two permanent magnets (308) are magnetically attached to the corresponding baffle plates (307) in frictional engagement.

8. The equipment used in the acidic soil improvement method according to claim 7, characterized in that: A main motor (404) for driving the rotation of the material distribution body (302) inside the material distribution cylinder (301) is fixedly installed on the push-pull bracket (402). A cylindrical brush (406) is also rotatably mounted on the push-pull bracket (402), and the cylindrical brush (406) is driven by an auxiliary motor (405) fixed on the push-pull bracket (402). The material distribution cylinder (301) is located between the side support plate (201) and the cylindrical brush (406).

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