Automatic injection device and injection method for soybean pot culture salt-tolerant identification

Abstract

The present application relates to the technical field of soybean cultivation, and discloses a soybean potting salt-tolerant and alkali-tolerant identification automatic injection device and injection method, which comprises a liquid storage tank, which is internally partitioned to form a water storage cavity, an alkali liquid cavity and a recycling cavity; a plurality of soybean potted plants, each soybean potted plant is partitioned by a physical isolation structure to form a water-connected fresh water area, a central planting area and a salt water area; and a fresh water supply pipeline connected with the water storage cavity and the fresh water area and provided with a first conveying pump; the device divides the planting area into a fresh water area, a central planting area and a salt water area by arranging a physical isolation structure in the soybean potted plant, and is respectively provided with a porous water-permeable partition plate and an ion-selective diaphragm, so that the water and salt ions are controlled in different areas; the design can not only simulate the gradient stress environment faced by the root system in the real saline-alkali soil, but also effectively prevent high-concentration salt from directly invading the root area, thereby providing more natural and highly controllable experimental conditions for salt-tolerant and alkali-tolerant identification.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of soybean cultivation, in particular to a device and a method for automatically injecting a pot-cultivated soybean in a saline-alkali environment. BACKGROUND

[0002] Soybean is an important food and oil crop, rich in high-quality plant protein and oil, and plays a key role in global food security and agricultural economy. However, soybean is a crop that is sensitive to salt-alkali stress. Its seed germination, seedling growth and root development are easily inhibited in a saline-alkali soil environment, resulting in low emergence rate, small plants and reduced yield. With the increasing shortage of arable land resources, a large amount of marginal land such as saline-alkali land needs to be developed and utilized. Therefore, cultivating and screening salt-alkali-tolerant soybean varieties has become an important direction of breeding research.

[0003] In order to scientifically evaluate the salt-alkali tolerance of soybean varieties, researchers usually use salt-alkali tolerance identification devices to simulate salt-alkali stress environments and carry out controllable experiments. Traditional identification methods mostly use whole immersion or uniform irrigation treatment, that is, the whole soybean or seeds are placed in a culture dish, a hydroponic box or a potting soil containing a certain concentration of salt solution, and the physiological response (such as germination rate, plant height, chlorophyll content, etc.) is observed to evaluate the tolerance. Although some devices introduce a salt solution supply system, the salt is usually uniformly applied to the entire root zone, which is difficult to simulate the heterogeneous distribution characteristics of salt-alkali soil such as "surface accumulation", "layering" or "lateral seepage" in the natural environment.

[0004] Such traditional devices have obvious limitations. First, the salt-alkali stress method is too simple and static, and it is difficult to dynamically adjust the salt concentration gradient, which cannot reflect the complex and variable salt-alkali environment in the field. Second, there is a lack of effective isolation of the water and salt ion transport paths, resulting in the root system being exposed to high salt and water stress at the same time, which confuses the effects of salt damage and drought damage and affects the accuracy of the identification results. Third, most devices do not have a liquid recovery and purification mechanism, and the salt solution is discarded after one-time use, which not only wastes resources but also may cause experimental conditions to drift due to salt accumulation. In addition, there is a lack of real-time monitoring and feedback control means, and the salt solution concentration and water supply amount are adjusted by manual operation, which has poor experimental repeatability and cannot meet the needs of high-throughput and standardized modern breeding. SUMMARY

[0005] The purpose of the present application is to provide a device for automatically injecting a pot-cultivated soybean in a saline-alkali environment.

[0006] In order to solve the above technical problems, the present application provides the following technical scheme: a device for automatically injecting a pot-cultivated soybean in a saline-alkali environment, comprising:

[0007] a liquid storage tank, which is internally partitioned to form a water storage cavity, an alkali solution cavity and a recycling cavity;

[0008] Multiple soybean potted plants, each separated by a physical isolation structure to form a hydraulically connected freshwater area, a central planting area, and a saline area;

[0009] A freshwater supply pipeline connects the water storage chamber to the freshwater area and is equipped with a first delivery pump.

[0010] The brine dispensing unit includes:

[0011] The premixing cylinder is connected to the water storage chamber and the alkali solution chamber through the first branch pipe and the second branch pipe respectively, and is equipped with a second delivery pump and a third delivery pump respectively;

[0012] The third branch pipe connects the premixing cylinder output end to the area above the brine zone;

[0013] Recycling systems include:

[0014] The first and second collection tanks are respectively located directly below the freshwater zone and the saline zone;

[0015] The first return pipe is connected to the first collection tank and the fresh water area at both ends, and is equipped with a fourth delivery pump and a first flow valve.

[0016] The second return pipe is connected to the second collection tank and the brine zone at both ends, and is equipped with a fifth delivery pump and a second flow valve.

[0017] A switchable tube connects the second collection tank and the reuse chamber;

[0018] The third return tube connects the reuse chamber and the second return tube;

[0019] The biological desalination component is located inside the reuse chamber of the storage tank;

[0020] The opening and closing of the switchable tube is controlled by the salt concentration threshold of the overflow liquid in the brine zone. Under normal conditions, the second return tube directly returns the overflow liquid to the brine zone.

[0021] According to the above technical solution, it also includes a sensing and detection unit, which includes:

[0022] The first salt concentration sensor at the premixing cylinder outlet;

[0023] The second salt concentration sensor is located in the second collection tank.

[0024] Root zone humidity sensor in the central planting area;

[0025] The sensing unit is connected to the controller, and the controller performs the following:

[0026] The flow rates of the second and third delivery pumps are dynamically adjusted based on the first salt concentration sensor.

[0027] When the value detected by the second salt concentration sensor is greater than the threshold, the switchable transistor is turned on.

[0028] The opening degree of the first flow valve is controlled based on feedback from the root zone humidity sensor.

[0029] According to the above technical solution, the physical isolation structure includes:

[0030] Porous permeable partition: Installed between the freshwater area and the central planting area, the porous permeable partition includes:

[0031] Rigid support frame;

[0032] Multi-stage filter media filled within a rigid support frame, comprising a coarse filter layer and a fine filter layer;

[0033] Ion-selective membrane: Located between the brine zone and the central planting zone, the ion-selective membrane includes:

[0034] Polymer base layer;

[0035] An ion-exchange functional layer is coated on the surface of the polymer substrate layer;

[0036] An anti-biofouling coating covers the outer surface of the ion exchange functional layer.

[0037] According to the above technical solution, the premixing cylinder is fixed to the side wall of the storage tank by clamps, and a mixing and stirring assembly is provided inside the premixing cylinder. The mixing and stirring assembly includes:

[0038] A servo motor is fixed to the outer wall of the premixing cylinder;

[0039] The stirring shaft passes through the top cover of the premixing cylinder and connects to the output end of the servo motor.

[0040] The stirring blades are distributed along the stirring shaft axis.

[0041] According to the above technical solution, the biological desalination component includes:

[0042] An algae culture rack is vertically fixed to the inner wall of the reuse chamber, and the surface of the algae culture rack is provided with microgrooves for algae attachment.

[0043] A multispectral light source array is embedded in the sidewall of the reuse cavity; the multispectral light source array includes red light and blue light.

[0044] The microporous aeration disc is laid at the bottom of the reuse chamber and is connected to an external air source through an air pipe.

[0045] The gas-liquid mixing enhancer is located in the middle of the trachea.

[0046] According to the above technical solution, the biological desalination component further includes:

[0047] A semiconductor cooling chip is attached to the outer wall of the reuse cavity;

[0048] The temperature sensor is located in the middle of the algae culture rack.

[0049] According to the above technical solution, a first filter plate can be detachably installed in the first collection tank, and the first filter plate includes:

[0050] The first fixed frame is fixed to the side wall of the first collection tank by bolts;

[0051] The filter consists of a coarse filter, an activated carbon layer, and a fine filter, arranged from top to bottom.

[0052] A second filter plate can be detachably installed in the second collection tank. The second filter plate includes:

[0053] The second fixed frame has the same structure as the first fixed frame of the first filter plate.

[0054] The filter consists of a second coarse filter, an ion exchange resin layer, and a hydrophobic coated fine filter, arranged from top to bottom.

[0055] According to the above technical solution, the ion exchange resin layer is an anion selective exchange resin;

[0056] The hydrophobic coated fine filter screen includes:

[0057] Metal matrix mesh;

[0058] A composite hydrophobic coating covers the surface of a metal substrate mesh. The composite hydrophobic coating contains a fluoropolymer matrix and nanoparticles dispersed therein.

[0059] The surface microstructure layer forms a grid-like flow guiding structure.

[0060] According to the above technical solution, the bottom of the first collection tank is provided with a first slope that is inclined toward the switchable tube, and a first sterilization component is installed on the side wall. The first sterilization component is a first ultraviolet lamp tube.

[0061] The bottom of the second collection tank is provided with a second ramp that tilts towards the switchable tube, and a second sterilization component is installed on the side wall. The second sterilization component includes:

[0062] Second ultraviolet lamp;

[0063] Ozone generator, with its output connected to a vortex mixer;

[0064] The submersible ozone nozzle is connected to a vortex mixer via piping and extends below the liquid surface of the second collection tank.

[0065] A method for identifying salt and alkali resistance through injection, comprising the following steps:

[0066] S1, Freshwater Supply Phase:

[0067] Start the first delivery pump to deliver fresh water from the storage chamber of the liquid storage tank to the fresh water area of ​​each soybean pot through the fresh water supply pipeline;

[0068] S2, dynamic brine dispensing stage:

[0069] Start the second and third delivery pumps, and pump the fresh water in the water storage chamber and the alkali solution in the alkali solution chamber into the premixing cylinder in proportion through the first and second branch pipes;

[0070] The mixing and stirring components stir and mix the solution in the premixing tank;

[0071] After mixing, the salt solution is transported to the saline zone of each soybean pot through the third branch pipe;

[0072] S3, Partitioned Recycling Stage:

[0073] The overflow liquid from the freshwater area enters the first collection tank and is directly returned to the freshwater area through the first return pipe;

[0074] The overflow liquid from the brine zone enters the second collection tank and, under normal conditions, is directly returned to the brine zone via the second return pipe.

[0075] S4, Desalination Triggering Phase:

[0076] When the value detected by the second salt concentration sensor is greater than the threshold, the controller turns on the switchable transistor.

[0077] High-salt overflow is introduced into a biological desalination unit for treatment via a switchable tube;

[0078] S5, Reuse Phase:

[0079] The liquid treated by the biological desalination unit is stored in the reuse chamber.

[0080] The regenerated brine in the cavity is then quantitatively reinjected into the brine zone through the third return pipe.

[0081] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0082] (1) This device divides the planting area into a freshwater zone, a central planting zone and a saline zone by setting up a physical isolation structure inside the soybean pot, and equips each zone with a porous permeable baffle and an ion-selective membrane, thereby realizing the zoned regulation of water and salt ions. This design can not only simulate the gradient stress environment faced by the root system in real saline-alkali soil, but also effectively prevent high concentrations of salt from directly invading the root zone, thus providing more natural and highly controllable experimental conditions for salt tolerance identification.

[0083] (2) By linking the premixing cylinder of the salt solution dispensing unit with the first salt concentration sensor to control the mixing ratio, combined with the threshold-triggered biological desalination of the overflow liquid in the brine zone, the salt concentration fluctuation range in the brine zone is controlled within ±5% of the set value. This mechanism completely solves the problem of osmotic pressure imbalance caused by salt accumulation in traditional identification, ensuring the scientificity and repeatability of soybean salt tolerance experimental data.

[0084] (3) This device integrates a sensing and detection unit and an intelligent controller. Key parameters are collected in real time through the first salt concentration sensor, the second salt concentration sensor and the root zone humidity sensor. The controller dynamically adjusts the flow rate of each delivery pump, the opening degree of the flow valve and the opening and closing state of the switchable tube, realizing closed-loop automatic control of salt solution preparation, water supply and overflow treatment. This intelligent operation mechanism significantly improves experimental accuracy and repeatability, while greatly reducing the need for manual intervention, improving operation efficiency and meeting the needs of high-throughput soybean variety screening.

[0085] (4) This device is equipped with a recycling system, including a first collection tank and a second collection tank corresponding to the fresh water area and the salt water area respectively, and is equipped with a return pipeline and a filter assembly. This system can collect, filter and purify the overflow liquid in stages and reuse it in a targeted manner. While ensuring a stable supply of experimental water, it can effectively reduce water waste and reflect the green and sustainable experimental concept.

[0086] (5) For high-salt overflow liquid, this device introduces biological desalination components. Through algae culture racks, multi-spectral light sources, microporous aeration and temperature control system, an ecological microenvironment suitable for microalgae growth is constructed. The physiological metabolic capacity of microalgae is used to achieve natural reduction of salt and pollutants. This not only reduces the cost of chemical treatment, but also gives the system a self-cleaning and regeneration function, improving the feasibility and environmental friendliness of long-term operation.

[0087] (6) The device is equipped with targeted sterilization components in the first and second collection tanks respectively. The fresh water side uses ultraviolet lamps for basic disinfection, while the saline side combines ultraviolet irradiation and ozone oxidation for dual sterilization. This differentiated sterilization strategy effectively inhibits the growth of microorganisms in different water quality environments, prevents biological pollution from interfering with experimental results, and ensures the hygiene and safety and operational stability of the entire circulation system.

[0088] (7) The filter structure in this device adopts a modular and detachable design. For example, the first filter plate and the second filter plate are installed in the collection tank through a fixed frame, which is convenient for regular maintenance, cleaning or replacement. In particular, the second filter plate integrates anion selective exchange resin and a composite filter with hydrophobic and antifouling properties, taking into account physical interception, ion regulation and anti-clogging functions, which significantly extends the system's trouble-free operation cycle. Attached Figure Description

[0089] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0090] Figure 1 This is a first perspective view of the present invention;

[0091] Figure 2 This is a second perspective view of the present invention;

[0092] Figure 3 This is a third perspective view of the present invention;

[0093] Figure 4 This is a fourth perspective schematic diagram of the present invention;

[0094] Figure 5 This is a first partial three-dimensional schematic diagram of the present invention;

[0095] Figure 6 This is a second partial perspective view of the present invention;

[0096] Figure 7 This is a third partial perspective view of the present invention;

[0097] Figure 8 This is a fourth partial perspective view of the present invention;

[0098] Figure 9 This is a fifth partial perspective view of the present invention;

[0099] Figure 10 This is a sixth partial perspective view of the present invention;

[0100] Figure 11 This is a third-dimensional schematic diagram of the seventh part of the present invention;

[0101] Figure 12 This is the present invention. Figure 10 Enlarged view of point A in the middle;

[0102] Figure 13 This is the present invention. Figure 10 Enlarged view of point B in the middle;

[0103] Figure 14 This is the present invention. Figure 11 Enlarged view of point C in the middle;

[0104] In the diagram: 1-Storage tank, 101-Water storage chamber, 102-Alkali chamber, 103-Reuse chamber, 2-Soybean potted plant, 201-Freshwater zone, 202-Central planting zone, 203-Brine zone, 204-Porous permeable partition, 204a-Rigid support frame, 204b-Multi-stage filter media, 205-Ion selective membrane, 205a-Polymer substrate layer, 205b-Ion exchange functional layer, 205c-Anti-biofouling coating, 3-Freshwater supply pipeline, 301-First delivery pump, 4-Brine dispensing unit, 401-First branch pipe, 402-Second branch pipe 403-Second delivery pump, 404-Third delivery pump, 405-Premixing cylinder, 406-Clamping device, 407-Third branch pipe, 408-Mixing and stirring assembly, 408a-Servo motor, 408b-Stirring shaft, 408c-Stirring blades, 5-Recycling system, 501-First collection tank, 502-Second collection tank, 503-First ramp, 504-Second ramp, 505-First filter plate, 505a-First fixed frame, 505b-First coarse filter screen, 505c-Activated carbon layer, 505d-Fine filter screen, 506-Second filter plate, 506a - Second fixed frame, 506b-Second coarse filter, 506c-Ion exchange resin layer, 506d-Hydrophobic coating fine filter, 506d1-Metal substrate mesh, 506d2-Composite hydrophobic coating, 506d3-Surface microstructure layer, 507-First sterilization component, 507a-First ultraviolet lamp, 508-Second sterilization component, 508a-Second ultraviolet lamp, 508b-Ozone generator, 508c-Vortex mixer, 508d-Immersion ozone nozzle, 509-First return pipe, 510-Second return pipe, 511-Fourth transfer pump, 512-First Flow valve, 513-Fifth delivery pump, 514-Second flow valve, 515-Switchable tube, 516-Third reflux tube, 517-Biological desalination component, 517a-Algae culture rack, 517b-Algae attachment microtrough, 517c-Multispectral light source array, 517d-Microporous aeration disc, 517e-Air pipe, 517f-Gas-liquid mixing enhancer, 517g-Semiconductor cooling chip, 517h-Temperature sensor, 6-Sensing and detection unit, 601-First salt concentration sensor, 602-Second salt concentration sensor, 603-Root zone humidity sensor, 604-Controller. Detailed Implementation

[0105] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0106] Please see Figures 1-14 The present invention provides a technical solution: an automatic injection device for identifying the salt and alkali tolerance of soybean potted plants, comprising:

[0107] The liquid storage tank 1 is internally divided into a water storage chamber 101, an alkali chamber 102, and a reuse chamber 103;

[0108] Multiple soybean pots 2, each soybean pot 2 is separated by a physical isolation structure to form a hydraulically connected freshwater zone 201, a central planting zone 202 and a saltwater zone 203;

[0109] Freshwater supply pipeline 3 connects water storage chamber 101 and freshwater area 201, and is equipped with first delivery pump 301;

[0110] The brine dispensing unit 4 includes:

[0111] The premixing cylinder 405 is connected to the water storage chamber 101 and the alkali chamber 102 through the first branch pipe 401 and the second branch pipe 402 respectively, and is equipped with a second delivery pump 403 and a third delivery pump 404 respectively.

[0112] The third branch pipe 407 connects the output end of the premixing cylinder 405 to the area above the brine zone 203;

[0113] Recycling system 5 includes:

[0114] The first collection tank 501 and the second collection tank 502 are respectively located directly below the fresh water zone 201 and the salt water zone 203;

[0115] The first return pipe 509 is connected to the first collection tank 501 and the fresh water area 201 at both ends, and is equipped with a fourth delivery pump 511 and a first flow valve 512.

[0116] The second return pipe 510 is connected to the second collection tank 502 and the brine zone 203 at both ends, and is equipped with a fifth delivery pump 513 and a second flow valve 514.

[0117] The switchable tube 515 connects the second collection tank 502 and the reuse chamber 103;

[0118] The third return pipe 516 connects the reuse cavity 103 and the second return pipe 510;

[0119] The biological desalination component 517 is installed in the reuse chamber 103 of the storage tank 1;

[0120] The opening and closing of the switchable tube 515 is controlled by the salt concentration threshold of the overflow liquid in the brine zone. Under normal conditions, the second return tube 510 directly returns the overflow liquid to the brine zone 203.

[0121] Specifically, it also includes a sensing and detection unit 6, which includes:

[0122] The first salt concentration sensor 601 at the outlet of the premixing cylinder 405;

[0123] The second salt concentration sensor 602 is located in the second collection tank 502;

[0124] Root zone humidity sensor 603 in central planting area 202;

[0125] The sensing unit 6 is connected to the controller 604, and the controller 604 performs the following:

[0126] The flow rates of the second delivery pump 403 and the third delivery pump 404 are dynamically adjusted based on the first salt concentration sensor 601.

[0127] When the value detected by the second salt concentration sensor 602 is greater than the threshold, the switchable transistor 515 is turned on.

[0128] The opening degree of the first flow valve 512 is controlled based on feedback from the root zone humidity sensor 603.

[0129] The sensing and detection unit 6, serving as the core of the automatic injection device for identifying the salt and alkali tolerance of soybean potted plants, consists of multiple sensors and works in conjunction with the controller 604 to achieve real-time monitoring and intelligent control of the system's operating status. Specifically, the first salt concentration sensor 601 is located at the outlet of the premixing cylinder 405 to monitor the salt concentration of the mixed salt solution output from the premixing cylinder 405 in real time. This first salt concentration sensor 601 transmits the collected salt concentration information to the controller 604, which then dynamically adjusts the operating flow rates of the second and third delivery pumps 403 based on this information. This mechanism... This ensures that the ratio of fresh water to alkali solution entering the premixing cylinder 405 always meets the target salt concentration requirements, thereby guaranteeing a stable and controllable saline-alkali environment for the solution supplied to the brine zone 203. This provides precise stress conditions for the identification of soybean salt and alkali tolerance. The second salt concentration sensor 602 is installed inside the second collection tank 502 to detect the liquid salt concentration overflowing from the brine zone 203 into the second collection tank 502. When the salt concentration detected by the sensor exceeds a preset threshold, it indicates that the salt accumulation in the brine zone 203 has reached a level requiring treatment. At this time, the controller 604 will issue a command to open the switchable tube 515 to allow high-salt overflow. The liquid is no longer directly returned to the saline zone 203, but is instead introduced into the reuse chamber 103 for desalination via the biological desalination component 517. This function effectively prevents the continuous accumulation of salt in the circulation system and maintains the long-term stability of the experimental environment. A root zone humidity sensor 603 is located in the central planting area 202 to monitor the soil or substrate moisture status in the soybean root zone. This sensor feeds back humidity information to the controller 604, which adjusts the opening of the first flow valve 512 accordingly, thereby controlling the amount of water returning to the freshwater zone 201 via the first return pipe 509. Through this closed-loop regulation mechanism, Maintaining a suitable water supply level in the central planting area 202 is crucial to prevent excessive dryness or waterlogging from affecting the normal growth of soybeans and to ensure that the salt tolerance identification results are not interfered with by non-salt factors. In summary, the sensing and detection unit 6 uses the first salt concentration sensor 601, the second salt concentration sensor 602, and the root zone humidity sensor 603 to sense the accuracy of salt solution preparation, the degree of salt accumulation, and the root zone moisture status in real time. The controller 604 coordinates and executes the corresponding control actions, thereby realizing intelligent and precise management of the entire device operation process and providing reliable and stable experimental conditions for soybean salt tolerance identification.

[0130] Specifically, the physical isolation structure includes:

[0131] Porous permeable partition 204: disposed between freshwater zone 201 and central planting zone 202, the porous permeable partition 204 includes:

[0132] Rigid support frame 204a;

[0133] Multi-stage filter media 204b is filled within a rigid support frame 204a. Multi-stage filter media 204b includes a coarse filter layer and a fine filter layer.

[0134] Ion-selective diaphragm 205: disposed between brine zone 203 and central planting zone 202, ion-selective diaphragm 205 includes:

[0135] Polymer substrate 205a;

[0136] An ion exchange functional layer 205b is coated on the surface of the polymer substrate layer 205a;

[0137] An anti-biofouling coating 205c covers the outer surface of the ion exchange functional layer 205b;

[0138] The physical isolation structure plays a crucial role in the partitioning and selective material transfer within the soybean pot 2. It consists of a porous permeable baffle 204 and an ion-selective membrane 205, located between the freshwater zone 201 and the central planting zone 202, and between the saline zone 203 and the central planting zone 202, respectively. This ensures that each functional zone is both independent and has controllable hydraulic or ion exchange connections. The porous permeable baffle 204, positioned between the freshwater zone 201 and the central planting zone 202, primarily facilitates the stable infiltration of freshwater into the central planting zone 202 while preventing substrate particles or roots from entering the freshwater zone. 201. The partition consists of a rigid support frame 204a and a multi-stage filter medium 204b filled within it. The rigid support frame 204a provides structural strength and maintains the shape stability of the partition under long-term humid conditions. The multi-stage filter medium 204b, through a combination of coarse and fine filter layers, progressively intercepts suspended solids and impurities, ensuring the cleanliness of the permeated water and preventing clogging or contamination of the central planting area 202. Simultaneously, it maintains good water permeability, allowing fresh water to be continuously and evenly supplied to the plant root zone. An ion-selective membrane 205 is positioned between the saline zone 203 and the central planting area 202, its function being... Unlike ordinary permeable structures, this membrane exhibits selective regulation of ion migration, aiming to simulate a saline-alkali stress environment while limiting the excessive intrusion of harmful ions into the root zone. The membrane is composed of a three-layer composite structure: a polymer base layer 205a serves as the basic support layer, providing the membrane with the necessary mechanical strength and flexibility; an ion exchange functional layer 205b is coated on the surface of the polymer base layer 205a, possessing the ability to selectively permeate specific ions, and can regulate the migration rate of sodium, chloride, and other salt ions to the central planting area 202, thereby forming a controllable salt gradient; and an anti-biofouling coating 205c covers the ion exchange layer. The outer surface of the functional layer 205b is used to inhibit microbial attachment and biofilm formation, prevent the membrane function from being weakened by biofouling, and ensure the stability of its ion selectivity performance during long-term operation. In summary, the porous permeable baffle 204 and the ion-selective membrane 205 together construct the differentiated interface between the central planting area 202 and the functional areas on both sides. The former ensures a continuous supply of clean fresh water, while the latter realizes intelligent blocking and regulation of salt ions. The two work together to keep the soybean roots in a microenvironment with sufficient water but controlled salt, providing accurate and repeatable experimental conditions for salt and alkali tolerance identification.

[0139] Specifically, the premixing cylinder 405 is fixed to the side wall of the storage tank 1 by a clamp 406, and a mixing and stirring assembly 408 is provided inside the premixing cylinder 405. The mixing and stirring assembly 408 includes:

[0140] Servo motor 408a is fixed to the outer wall of premixing cylinder 405;

[0141] The stirring shaft 408b passes through the top cover of the premixing cylinder 405 and is connected to the output end of the servo motor 408a.

[0142] The stirring blades 408c are distributed along the axial direction of the stirring shaft 408b;

[0143] The premixing cylinder 405 is fixed to the side wall of the storage tank 1 by clamps 406. This fixing method ensures the structural stability of the premixing cylinder 405 during operation and facilitates installation and maintenance. As the core container for brine preparation, the premixing cylinder 405 is equipped with a mixing and stirring assembly 408 inside to achieve uniform mixing of fresh water and alkali solution, ensuring the consistency and accuracy of the output brine concentration. The mixing and stirring assembly 408 consists of three parts: a servo motor 408a, a stirring shaft 408b, and stirring blades 408c. The servo motor 408a is fixed to the outer wall of the premixing cylinder 405 and provides controllable rotational driving force as a power source. The stirring shaft 408b passes through the top cover of the premixing cylinder 405 and is connected to the output end of the servo motor 408a. The direct connection transmits the rotational motion to the interior of the premixing cylinder 405. The stirring blades 408c are distributed along the axial direction of the stirring shaft 408b. Their layout design can effectively agitate the liquid inside the cylinder, promoting the full mixing of the fresh water entering from the first branch pipe 401 and the alkaline solution entering from the second branch pipe 402. Through the coordinated work of the mixing and stirring components 408, the premixing cylinder 405 can quickly and uniformly complete the brine preparation process, avoiding the problem of excessively high local concentration or uneven mixing, thus laying the foundation for the subsequent precise supply of brine zone 203. At the same time, driven by the servo motor 408a, the stirring speed can be adjusted according to actual needs to adapt to the mixing requirements under different ratios or volumes, improving the flexibility and reliability of the system operation.

[0144] Specifically, the biological desalination component 517 includes:

[0145] Algae culture rack 517a is vertically fixed to the inner wall of the reuse cavity 103, and algae attachment microgrooves 517b are provided on the surface of the algae culture rack 517a.

[0146] A multispectral light source array 517c is embedded in the sidewall of the reuse cavity 103. The multispectral light source array 517c includes red LEDs and blue LEDs.

[0147] The microporous aeration disc 517d is laid at the bottom of the reuse chamber 103, and the microporous aeration disc 517d is connected to an external CO2 gas source through the air pipe 517e.

[0148] Gas-liquid mixing enhancer 517f is located in the middle of gas pipe 517e;

[0149] The biological desalination component 517 is installed inside the reuse chamber 103 of the storage tank 1. Its core function is to desalinate and purify the high-salt overflow liquid through biological means, achieving salt reduction and water regeneration, and providing the system with sustainable liquid reuse capabilities. This component consists of multiple cooperating structural units that jointly construct a micro-ecological environment suitable for algae growth and efficient desalination. The algae cultivation rack 517a is vertically fixed to the inner wall of the reuse chamber 103, providing a carrier for algae attachment and growth. Its plate surface is equipped with algae attachment micro-grooves 517b. These microgrooves increase the specific surface area and provide stable attachment points for algal cells, which is conducive to the formation of high-density biofilms, thereby improving the biological desalination efficiency per unit volume. A multispectral light source array 517c is embedded in the sidewall of the reuse cavity 103 to provide the necessary lighting conditions for algal photosynthesis. This array includes red and blue LEDs, corresponding to the main wavelengths of algal chlorophyll absorption spectra, which can effectively stimulate photosynthetic activity, promote algal growth and metabolism, and thus enhance its ability to absorb, enrich, or convert salt ions. Micropores... An aeration disc 517d is placed at the bottom of the reuse chamber 103 and connected to an external CO2 gas source via an air pipe 517e. This allows for a continuous supply of carbon dioxide to the reuse chamber 103. As a key carbon source for algal photosynthesis, a stable supply of carbon dioxide is crucial for maintaining algal physiological activity. The microporous aeration disc 517d disperses the gas into fine bubbles, increasing the gas-liquid contact area and promoting CO2 dissolution. A gas-liquid mixing enhancer 517f is located in the middle of the air pipe 517e. This device further enhances the mixing efficiency of gas and liquid, thus improving the CO2 dissolution rate. The dissolution rate and uniformity in the liquid avoid local carbon source deficiency and ensure that algae can obtain sufficient photosynthetic raw materials in all areas of the reuse chamber 103. In summary, the biological desalination component 517 provides biological carriers through algae culture rack 517a, supplies light energy through multispectral light source array 517c, and supplies carbon in synergy with microporous aeration disc 517d and gas-liquid mixing enhancer 517f. This constructs an efficient and stable algae desalination system, which enables high-salt overflow liquid to be naturally desalinated and purified in the reuse chamber 103, providing water quality assurance for the recycling of brine zone 203.

[0150] Specifically, the biological desalination component 517 further includes:

[0151] A 517g semiconductor cooling chip is attached to the outer wall of the recycling cavity 103.

[0152] Temperature sensor 517h is located in the middle of algae culture rack 517a;

[0153] The biological desalination component 517 further includes a semiconductor cooling chip 517g and a temperature sensor 517h. Together, they constitute a monitoring and control unit for the internal temperature environment of the reuse chamber 103, ensuring that algae efficiently perform their desalination function under suitable temperature conditions. The semiconductor cooling chip 517g is attached to the outer wall of the reuse chamber 103 and acts as an active temperature control actuator, capable of cooling the liquid inside the reuse chamber 103 according to system requirements. The physiological activity of algae is highly sensitive to temperature changes; excessively high or low temperatures may inhibit their growth and metabolic capacity, thus affecting desalination efficiency. Through the thermoelectric cooling effect of the semiconductor cooling chip 517g, the liquid temperature inside the reuse chamber 103 can be effectively reduced when the ambient temperature is high or the water temperature rises due to system operation heat, maintaining the algae's optimal temperature. The optimal temperature zone for algal survival is determined by a temperature sensor 517h located in the middle of the algae culture rack 517a. This sensor directly monitors the real-time temperature of the algae attachment area. This location is representative and can accurately reflect the thermal conditions of the microenvironment in which the algal biofilm is located. The temperature sensor 517h transmits the collected temperature signal to the control system. The control system then determines whether to activate or adjust the working intensity of the semiconductor cooling chip 517g, thereby achieving closed-loop management of the temperature of the reuse chamber 103. Through the coordinated operation of the temperature sensor 517h and the semiconductor cooling chip 517g, the biological desalination component 517 can dynamically maintain a stable temperature environment suitable for algal growth and desalination metabolism under different external environments or operating conditions, ensuring the continuity, efficiency, and reliability of the biological desalination process.

[0154] Specifically, a first filter plate 505 can be detachably installed in the first collection tank 501, and the first filter plate 505 includes:

[0155] The first fixed frame 505a is fixed to the side wall of the first collection tank 501 by bolts;

[0156] The first coarse filter 505b, the activated carbon layer 505c, and the fine filter 505d are arranged from top to bottom;

[0157] A second filter plate 506 can be detachably installed in the second collection tank 502. The second filter plate 506 includes:

[0158] The second fixed frame 506a has the same structure as the first fixed frame 505a of the first filter plate 505.

[0159] The second coarse filter 506b, the ion exchange resin layer 506c, and the hydrophobic coated fine filter 506d are arranged from top to bottom;

[0160] A first filter plate 505 is detachably installed in the first collection tank 501 for multi-stage physical and adsorption purification of liquid overflowing from the freshwater zone 201. The first filter plate 505 consists of a first fixed frame 505a, a first coarse filter 505b, an activated carbon layer 505c, and a fine filter 505d. The first fixed frame 505a is fixed to the side wall of the first collection tank 501 by bolts, providing stable support for the entire filtration structure and facilitating disassembly, cleaning, or replacement. The first coarse filter 505b, the activated carbon layer 505c, and the fine filter 505d arranged from top to bottom form a gradient filtration system. The first coarse filter 505b intercepts larger particulate impurities, the activated carbon layer 505c adsorbs dissolved organic matter, odors, and some trace pollutants, and the fine filter 505d further traps fine suspended matter, ensuring the cleanliness of the water returning to the freshwater zone 201 and avoiding clogging of pipes or pollution of the root zone environment.

[0161] The second collection tank 502 is equipped with a detachable second filter plate 506, which functions to perform preliminary purification and ion regulation on the high-salt overflow liquid from the brine zone 203. The second filter plate 506 includes a second fixed frame 506a, a second coarse filter screen 506b, an ion exchange resin layer 506c, and a hydrophobic coating fine filter screen 506d. The second fixed frame 506a is structurally the same as the first fixed frame 505a and is also quick to install and remove using bolts, which is convenient for maintenance. The filter layers are arranged from top to bottom as follows: the second coarse filter screen 506b is used to remove large particulate impurities; the ion exchange resin layer 506c uses anion selective exchange resin, which can selectively adsorb harmful anions (such as chloride ions) in the solution, thereby reducing the salt load and improving water quality to a certain extent; and the hydrophobic coating fine filter screen 506d is located at the bottom layer, which has both fine filtration and anti-fouling properties, preventing fine particles from penetrating, and its surface properties help reduce clogging caused by salt crystallization or biological adhesion.

[0162] Both filter plates adopt a modular and detachable design, which not only improves the reliability of the device operation, but also facilitates regular cleaning or replacement of consumables, ensuring the long-term stable operation of the circulation system. The first filter plate 505 focuses on conventional purification to maintain the quality of freshwater reuse, while the second filter plate 506 takes into account both physical filtration and ion regulation, providing pretreatment guarantee for whether to enter the biological desalination process later.

[0163] Specifically, the ion exchange resin layer 506c is an anion selective exchange resin;

[0164] The hydrophobic coated fine filter 506d includes:

[0165] Metal matrix mesh 506d1;

[0166] A composite hydrophobic coating 506d2 covers the surface of a metal substrate mesh 506d1, and the composite hydrophobic coating 506d2 contains a fluoropolymer matrix and nanoparticles dispersed therein.

[0167] The surface microstructure layer 506d3 forms a grid-like flow guiding structure;

[0168] The ion exchange resin layer 506c uses anion-selective exchange resin. Its main function is to selectively adsorb and exchange anions (such as chloride ions and sulfate ions) contained in the overflow liquid of the brine zone 203. In a high-salt environment, these anions are important components of salt stress. Through the action of the anion-selective exchange resin, the concentration of specific harmful anions in the solution can be effectively reduced in the preliminary filtration stage, reducing the processing load of the subsequent biological desalination component 517, and to a certain extent, regulating the ionic composition of the reflux brine, providing a more controllable salt environment for salt and alkali tolerance identification experiments. The hydrophobic coated fine filter screen 506d, as the bottom layer of the second filter plate 506, has the dual functions of fine filtration and anti-fouling. Its structure is composed of a metal matrix mesh 506d1, a composite hydrophobic coating 506d2, and a surface microstructure layer 506d3. The metal matrix mesh 506d1 provides mechanical support to ensure that the filter screen is in high-salt conditions. Maintaining structural integrity and durability under salt and high humidity conditions, the composite hydrophobic coating 506d2 covers the surface of the metal substrate mesh 506d1. Composed of a fluoropolymer matrix and uniformly dispersed nanoparticles, it endows the filter with significant hydrophobic properties, effectively inhibiting water retention and salt crystallization, thereby reducing the risk of clogging and delaying dirt accumulation. The surface microstructure layer 506d3 is located on the outermost side, forming a regular grid-like flow guiding structure, which not only further enhances the uniformity of liquid flow and guides the filtrate through in an orderly manner, but also enhances the hydrophobic effect at the microscale, synergistically achieving efficient filtration and self-cleaning functions. In summary, the ion exchange resin layer 506c and the hydrophobic coating fine filter 506d optimize the pretreatment capability of the second collection tank 502 from the perspectives of ion regulation and physical antifouling, respectively, so that the liquid entering the circulation or desalination process is significantly improved in terms of composition and cleanliness, providing key support for the stable operation of the entire system and experimental accuracy.

[0169] Specifically, the bottom of the first collection tank 501 is provided with a first slope 503 that is inclined toward the switchable tube 515, and a first sterilization component 507 is installed on the side wall. The first sterilization component 507 is a first ultraviolet lamp tube 507a.

[0170] The bottom of the second collection tank 502 is provided with a second ramp 504 inclined toward the switchable tube 515, and a second sterilization component 508 is installed on the side wall. The second sterilization component 508 includes:

[0171] Second UV lamp 508a;

[0172] Ozone generator 508b, the output of ozone generator 508b is connected to eddy current mixer 508c;

[0173] The submersible ozone nozzle 508d is connected to the vortex mixer 508c via a pipeline and extends to the liquid surface of the second collection tank 502.

[0174] The bottom of the first collection tank 501 is provided with a first ramp 503 inclined towards the switchable pipe 515. This structural design facilitates the natural collection and flow of overflow liquid from the freshwater zone 201 towards the switchable pipe 515 under the action of gravity, reducing liquid retention, improving drainage efficiency, and providing convenience for possible emergency diversion or maintenance operations. At the same time, a first sterilization component 507 is installed on the side wall of the first collection tank 501. This component is specifically a first ultraviolet lamp 507a. The first ultraviolet lamp 507a continuously or intermittently irradiates the liquid in the tank, using ultraviolet light to destroy the genetic material of microorganisms, effectively inhibiting the growth of bacteria, algae and other organisms in the freshwater circuit. This ensures the biological cleanliness of the reused freshwater and prevents biological contamination of the central planting area 202. The bottom of the second collection tank 502 is equipped with a second slope 504 inclined towards the switchable pipe 515. Its function is similar to the first slope 503, aiming to efficiently collect and direct the high-salt liquid overflowing from the brine zone 203, facilitating its introduction into the reuse chamber 103 for desalination when needed via the switchable pipe 515. This also reduces sediment accumulation at the bottom of the tank. Furthermore, the sidewall of the second collection tank 502 is equipped with a more robust second sterilization component 508 to address the salt-tolerant microorganisms and organic pollutants that are more prone to proliferate in high-salt environments. The secondary sterilization component 508 consists of a second ultraviolet lamp 508a, an ozone generator 508b, a vortex mixer 508c, and a submersible ozone nozzle 508d. The second ultraviolet lamp 508a provides basic ultraviolet sterilization, while the ozone generator 508b produces highly reactive ozone gas. This gas is transported via pipeline to the vortex mixer 508c, where it is thoroughly mixed with a small amount of liquid or gas to form a high-concentration ozone solution. Subsequently, the mixed ozone is released below the liquid surface of the second collection tank 502 through the submersible ozone nozzle 508d, which uniformly disperses the ozone in the form of microbubbles within the liquid. In this system, the contact area and reaction efficiency between ozone and liquid are significantly increased, thereby achieving deep oxidation and inactivation of bacteria, viruses, organic residues and some reducing substances. Through the above structure, the first collection tank 501 and the second collection tank 502 not only achieve efficient liquid drainage, but are also equipped with sterilization systems adapted to their water quality characteristics. The first sterilization component 507 focuses on maintaining the biological stability of the freshwater system, while the second sterilization component 508 adopts a dual sterilization mechanism of "ultraviolet + ozone" to effectively cope with the complex microbial risks in high-salt environments, providing key guarantees for the hygiene safety and long-term stable operation of the entire recycling system.

[0175] A method for identifying salt and alkali resistance through injection, comprising the following steps:

[0176] S1, Freshwater Supply Phase:

[0177] Start the first delivery pump 301 and deliver the fresh water in the water storage chamber 101 of the liquid storage tank 1 to the fresh water area 201 of each soybean pot 2 through the fresh water supply pipeline 3.

[0178] Provide fresh water for the basic growth of soybean plants, maintain the initial humidity environment of the central planting area 202, and achieve slow water infiltration through the porous permeable baffle 204 between the fresh water area 201 and the central planting area 202, simulating the natural soil moisture migration process.

[0179] S2, dynamic brine dispensing stage:

[0180] The second delivery pump 403 and the third delivery pump 404 are started simultaneously. Fresh water is drawn from the water storage chamber 101 through the first branch pipe 401, and alkali solution is drawn from the alkali solution chamber 102 through the second branch pipe 402. The alkali solution is then pumped into the premixing cylinder 405 according to a preset ratio.

[0181] The mixing and stirring assembly 408 inside the premixing cylinder 405 is started, and the servo motor 408a drives the stirring shaft 408b to drive the stirring blades 408c to mix the solution at high speed.

[0182] The well-mixed salt solution is transported through the third branch pipe 407 to the salt water zone 203 of each soybean pot 2;

[0183] The salt concentration of the mixed solution is monitored in real time by the first salt concentration sensor 601, and the flow ratio of the second delivery pump 403 and the third delivery pump 404 is dynamically adjusted by the controller 604 to ensure that the salt concentration error is ≤3%. The salt solution forms an ion gradient permeation through the ion-selective membrane 205 between the brine zone 203 and the central planting zone 202, which accurately simulates the stress effect of the saline-alkali environment on soybean roots.

[0184] S3, Partitioned Recycling Stage:

[0185] The overflow liquid in freshwater zone 201 flows into the first collection tank 501 directly below under the action of gravity. After being filtered through three stages by the coarse filter screen 505b, the activated carbon layer 505c and the fine filter screen 505d of the first filter plate 505, it is returned to freshwater zone 201 by the fourth delivery pump 511 through the first return pipe 509. The first flow valve 512 adjusts the flow rate according to the feedback from the root zone humidity sensor 603.

[0186] The overflow liquid from the brine zone 203 flows into the second collection tank 502 along the second slope 504. When the salt concentration does not exceed the standard, it is treated by the coarse filter 506b, the ion exchange resin layer 506c and the hydrophobic coating fine filter 506d of the second filter plate 506, and then directly returned to the brine zone 203 by the fifth transfer pump 513 through the second return pipe 510.

[0187] The first ultraviolet lamp 507a sterilizes the freshwater overflow and prevents microbial contamination. The surface microstructure layer 506d3 of the hydrophobic coated fine filter screen 506d guides salt crystals and avoids clogging. The independent circulation of the partition reduces cross-contamination between freshwater and saltwater and maintains the stability of the experimental environment.

[0188] S4, Desalination Triggering Phase:

[0189] When the value detected by the second salt concentration sensor 602 in the second collection tank 502 exceeds the preset threshold, the controller 604 automatically turns on the switchable tube 515.

[0190] The high-salt overflow liquid is introduced into the biological desalination component 517 through the switchable tube 515. At the same time, the second sterilization component 508 is activated, and the second ultraviolet lamp tube 508a irradiates and sterilizes. The ozone generator 508b generates ozone, which is mixed by the vortex mixer 508c and then injected into the liquid through the immersion ozone nozzle 508d for deep disinfection.

[0191] To avoid contamination from algae cultivation in high-salt environments and improve biological desalination efficiency, a salt concentration threshold triggering mechanism ensures that desalination is only initiated when necessary, reducing energy consumption by more than 40%.

[0192] S5, Reuse Phase:

[0193] High-salt overflow is treated in biological desalination component 517. Algae are attached to micro-grooves 517b of algae culture rack 517a to absorb salt ions. Multispectral light source array 517c provides red and blue light to promote photosynthesis. Microporous aeration disc 517d introduces CO2 and is enhanced by gas-liquid mixing enhancer 517f. Semiconductor cooling chip 517g maintains constant temperature.

[0194] After desalination, the liquid is stored in the reuse chamber 103, and the regenerated brine in the reuse chamber 103 is quantitatively reinjected into the brine zone 203 through the third return pipe 516.

[0195] Algal metabolism and transformation of Na + / Cl - Plasma reduces salt concentration by 30%-50%, and the regenerated salt solution is directly reinjected into the brine zone 203 to avoid repeated mixing operations and shorten the salt circulation path. The semiconductor cooling chip 517g, together with the temperature sensor 517h, controls the liquid temperature at 25±2℃ to ensure the optimal desalination activity of algae.

[0196] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0197] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic injection device for identifying the salt and alkali tolerance of soybean potted plants, characterized in that, include: The liquid storage tank (1) is internally divided into a water storage chamber (101), an alkali chamber (102), and a reuse chamber (103). Multiple soybean potted plants (2), each soybean potted plant (2) is separated by a physical isolation structure to form a hydraulically connected freshwater area (201), a central planting area (202) and a saltwater area (203). The physical isolation structure includes: Porous permeable partition (204): Located between the freshwater area (201) and the central planting area (202), the porous permeable partition (204) includes: Rigid support frame (204a); Multi-stage filter media (204b) filled within a rigid support frame (204a), the multi-stage filter media (204b) comprising a coarse filter layer and a fine filter layer; Ion-selective diaphragm (205): disposed between the brine zone (203) and the central planting zone (202), the ion-selective diaphragm (205) includes: Polymer substrate (205a); An ion exchange functional layer (205b) is coated on the surface of a polymer substrate layer (205a); An anti-biofouling coating (205c) covers the outer surface of the ion exchange functional layer (205b); A freshwater supply pipeline (3) connects the water storage chamber (101) and the freshwater area (201), and is equipped with a first delivery pump (301). The brine dispensing unit (4) includes: The premixing cylinder (405) is connected to the water storage chamber (101) and the alkali chamber (102) respectively through the first branch pipe (401) and the second branch pipe (402), and is equipped with a second delivery pump (403) and a third delivery pump (404). The third branch pipe (407) connects the output end of the premixing cylinder (405) to the area above the brine zone (203); The recycling system (5) includes: The first collection tank (501) and the second collection tank (502) are respectively located directly below the freshwater zone (201) and the saltwater zone (203); The first return pipe (509) is connected to the first collection tank (501) and the fresh water area (201) at both ends, and is equipped with a fourth delivery pump (511) and a first flow valve (512). The second return pipe (510) is connected to the second collection tank (502) and the brine zone (203) at both ends, and is equipped with a fifth delivery pump (513) and a second flow valve (514). A switchable tube (515) connects the second collection tank (502) and the reuse chamber (103). The third return pipe (516) connects to the reuse chamber (103) and the second return pipe (510); The biological desalination component (517) is located in the reuse chamber (103) of the storage tank (1); The biological desalination component (517) includes: Algae culture rack (517a) is vertically fixed to the inner wall of the reuse chamber (103), and algae attachment microgrooves (517b) are provided on the surface of the algae culture rack (517a). A multispectral light source array (517c) is embedded in the sidewall of the reuse cavity (103). The multispectral light source array (517c) includes red LEDs and blue LEDs. The microporous aeration disc (517d) is laid at the bottom of the reuse chamber (103), and the microporous aeration disc (517d) is connected to an external CO2 gas source through an air pipe (517e); A gas-liquid mixing enhancer (517f) is located in the middle of the gas tube (517e); The opening and closing of the switchable tube (515) is controlled by the salt concentration threshold of the overflow liquid in the brine zone. Under normal conditions, the second return tube (510) directly returns the overflow liquid to the brine zone (203).

2. The automatic injection device for identifying the salt and alkali tolerance of soybean potted plants according to claim 1, characterized in that: It also includes a sensing and detection unit (6), which includes: The first salt concentration sensor (601) at the outlet of the premixing cylinder (405); The second salt concentration sensor (602) is located in the second collection tank (502); Root zone humidity sensor (603) in the central planting area (202); The sensing and detection unit (6) is connected to the controller (604), and the controller (604) executes: The flow rates of the second delivery pump (403) and the third delivery pump (404) are dynamically adjusted based on the first salt concentration sensor (601); When the value detected by the second salt concentration sensor (602) is greater than the threshold, the switchable transistor (515) is turned on. The opening degree of the first flow valve (512) is controlled based on feedback from the root zone humidity sensor (603).

3. The automatic injection device for identifying the salt and alkali tolerance of soybean potted plants according to claim 2, characterized in that: The premixing cylinder (405) is fixed to the side wall of the storage tank (1) by clamps (406). A mixing and stirring assembly (408) is provided inside the premixing cylinder (405). The mixing and stirring assembly (408) includes: A servo motor (408a) is fixed to the outer wall of the premixing cylinder (405); The stirring shaft (408b) passes through the top cover of the premixing cylinder (405) and is connected to the output end of the servo motor (408a); The stirring blades (408c) are distributed axially along the stirring shaft (408b).

4. The automatic injection device for identifying the salt and alkali tolerance of soybean potted plants according to claim 3, characterized in that: The biological desalination component (517) also includes: A semiconductor cooling chip (517g) is attached to the outer wall of the recycling chamber (103); A temperature sensor (517h) is located in the middle of the algae culture rack (517a).

5. The automatic injection device for identifying the salt and alkali tolerance of soybean potted plants according to claim 4, characterized in that: A first filter plate (505) is detachably installed in the first collection tank (501). The first filter plate (505) includes: The first fixed frame (505a) is fixed to the side wall of the first collection tank (501) by bolts; The filter consists of a first coarse filter (505b), an activated carbon layer (505c), and a fine filter (505d) arranged from top to bottom. A second filter plate (506) can be detachably installed in the second collection tank (502). The second filter plate (506) includes: The second fixed frame (506a) has the same structure as the first fixed frame (505a) of the first filter plate (505); The filter consists of a second coarse filter (506b), an ion exchange resin layer (506c), and a hydrophobic coated fine filter (506d), arranged from top to bottom.

6. The automatic injection device for identifying the salt and alkali tolerance of soybean potted plants according to claim 5, characterized in that: The ion exchange resin layer (506c) is an anion selective exchange resin; The hydrophobic coated fine filter (506d) includes: Metal matrix mesh (506d1); A composite hydrophobic coating (506d2) covers the surface of a metal substrate mesh (506d1), and the composite hydrophobic coating (506d2) contains a fluoropolymer matrix and nanoparticles dispersed therein; The surface microstructure layer (506d3) forms a grid-like flow-guiding structure.

7. The automatic injection device for identifying the salt and alkali tolerance of soybean potted plants according to claim 6, characterized in that: The bottom of the first collection tank (501) is provided with a first slope (503) that is inclined toward the switchable tube (515), and a first sterilization component (507) is installed on the side wall. The first sterilization component (507) is a first ultraviolet lamp tube (507a). The bottom of the second collection tank (502) is provided with a second ramp (504) inclined toward the switchable tube (515), and a second sterilization component (508) is installed on the side wall. The second sterilization component (508) includes: Second ultraviolet lamp (508a); Ozone generator (508b), the output of ozone generator (508b) is connected to eddy current mixer (508c); The submersible ozone nozzle (508d) is connected to the vortex mixer (508c) via a pipeline and extends to the liquid surface of the second collection tank (502).

8. The salt and alkali resistance identification injection method based on the device of claim 7, characterized in that, Includes the following steps: S1, Freshwater Supply Phase: Start the first delivery pump (301) and deliver the fresh water in the water storage chamber (101) of the liquid storage tank (1) to the fresh water area (201) of each soybean pot (2) through the fresh water supply pipeline (3). S2, dynamic brine dispensing stage: Start the second delivery pump (403) and the third delivery pump (404) to pump the fresh water in the water storage chamber (101) and the alkaline solution in the alkaline solution chamber (102) into the premixing cylinder (405) in proportion through the first branch pipe (401) and the second branch pipe (402). The mixing and stirring assembly (408) stirs and mixes the solution in the premixing cylinder (405); After mixing, the salt solution is transported through the third branch pipe (407) to the salt water area (203) of each soybean pot (2). S3, Partitioned Recycling Stage: The overflow liquid from the freshwater area (201) enters the first collection tank (501) and is directly returned to the freshwater area (201) through the first return pipe (509); The overflow liquid from the brine zone (203) enters the second collection tank (502) and is normally returned to the brine zone (203) directly through the second return pipe (510). S4, Desalination Triggering Phase: When the value detected by the second salt concentration sensor (602) is greater than the threshold, the controller (604) turns on the switchable transistor (515). The high-salt overflow is introduced into the biological desalination unit (517) for treatment via a switchable tube (515); S5, Reuse Phase: The liquid treated by the biological desalination unit (517) is stored in the reuse chamber (103); The regenerated brine in the reuse chamber (103) is quantitatively reinjected into the brine zone (203) through the third return pipe (516).

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