A stress simulation device for screening soybean saline-alkali tolerant varieties and a method of using the same

Abstract

This invention relates to the field of soybean cultivation and screening technology, specifically to a stress simulation device for screening salt-alkali tolerant soybean varieties and its usage method. The device includes a planting box lined with soil, and a blower pipe installed on one side of the upper end of the planting box. The blower pipe houses a main fan, with its exhaust end facing the upper surface of the soil. A C-shaped pipe is fixedly installed on the other side of the planting box, with its lower end facing the output end of the blower pipe and its upper end facing the soil. A spray pipe is also included, fixedly installed on the upper port of the planting box, with a nozzle installed at its lower end. This invention, by setting up mutually circulating air-blowing structures on both sides of the planting box, makes the soybean planting environment closer to the actual saline-alkali soil environment, thereby improving the accuracy of soybean seedling screening and ensuring the survival rate of subsequent soybean planting.

Description

Technical Field

[0001] This invention belongs to the field of soybean cultivation screening technology, specifically, it relates to a stress simulation device for screening salt-tolerant soybean varieties. Background Technology

[0002] As a crop of significant economic value, soybean cultivation is expanding into marginal lands such as saline-alkali lands thanks to advancements in agricultural technology. However, excessively high salt and alkalinity in saline-alkali lands directly cause osmotic stress and ion toxicity to soybean plants, severely restricting their germination, growth, and final yield. Therefore, the key to successfully cultivating soybeans in such lands lies in selecting varieties with strong salt and alkali tolerance.

[0003] Before cultivation, breeders typically need to plant soybeans in simulated saline-alkali soil environments for tolerance screening. However, existing screening models mainly focus on simple salinity and alkalinity adjustments of the soil and water, which differs significantly from the real saline-alkali environment. The actual saline-alkali environment is more complex: for example, due to the high salt and alkali content on the surface of saline-alkali soil, the surface vegetation is relatively sparse, thus promoting the circulation of natural wind. The continuous circulation of natural wind will also exacerbate the evaporation of surface water and lift some fine salt and alkali particles from the surface, causing them to adhere directly to the plant leaves. This saline-alkali environment, composed of multiple factors, cannot be simulated by the current simplified screening environment, resulting in insufficient accuracy of the tolerance assessment results of the selected varieties, ultimately affecting their performance and success rate in large-scale actual planting. Summary of the Invention

[0004] This invention provides a stress simulation device for screening salt-tolerant soybean varieties. By setting up circulating airflow structures on both sides of the planting box, it solves the problems mentioned in the background art, namely: the screening environment cannot simulate the actual saline-alkali soil environment, and the tolerance assessment results of the screened varieties are not accurate enough.

[0005] To address the aforementioned technical problems, a stress simulation device for screening salt-tolerant soybean varieties is provided, comprising a planting box filled with soil, and an air blower installed on one side of the upper end of the planting box, wherein a main fan is installed inside the air blower and the exhaust end of the air blower faces the upper surface of the soil. A C-shaped pipe is fixedly installed on the other side of the planting box, with the lower end of the C-shaped pipe facing the output end of the air blower and the upper end of the C-shaped pipe facing the upper surface of the soil. The device also includes a spray pipe fixedly installed on the upper port of the planting box, with a nozzle installed at the lower end of the spray pipe.

[0006] In addition, the upper end of the C-shaped tube is connected to a movable tube through a first elastic flexible hose, and an inverted L-shaped tube is fixedly connected to the planting box. The upper end of the inverted L-shaped tube faces the output end of the movable tube, and the lower end of the inverted L-shaped tube is connected to the input end of the blower tube through a second elastic flexible hose. A filter element is installed inside the inverted L-shaped tube to make full use of the airflow.

[0007] Secondly, a U-shaped frame is slidably installed at the bottom of the planting box. Both ends of the U-shaped frame are fixedly connected to pull ropes. The ends of the two pull ropes are respectively fixedly connected to the movable tube and the blower tube. The bottom of the planting box is provided with a lifting part to drive the U-shaped frame to rise and fall, so as to make the airflow more evenly act on the soil and plants.

[0008] Furthermore, a water tank is fixedly installed on the planting box, and a water pump is fixedly installed on the water tank. The input end of the water pump extends into the water tank, and the output end of the water pump is fixedly connected to the spray pipe through a delivery pipe, mainly to facilitate water supply to the spray pipe.

[0009] Furthermore, two pulleys are installed on the outer wall of the planting box and inside the water tank. Belts are installed on the four pulleys, and the belts have two symmetrical mounting slots. The filter element is elongated and there are two sets of filter elements. The other filter element is located inside the water tank, and the two sets of filter elements are installed in the two mounting slots respectively. The side wall of the inverted L-shaped tube has an opening, through which the belt passes. A second motor is fixedly installed on the planting box to drive one of the pulleys to rotate, so that the collected salt and alkali particles can be reused.

[0010] Therefore, by setting up mutually circulating air-blowing structures on both sides of the planting box, the soybean planting environment is made closer to the actual saline-alkali soil environment, thereby improving the accuracy of soybean seedling selection and ensuring the survival rate of subsequent soybean planting.

[0011] A method for using a stress simulation device for screening salt-tolerant soybean varieties includes the following steps: S1. Plant different soybean seedlings in the soil of the planting box; S2. Water is sprayed onto the soil through the nozzles on the nozzle; S3. Blow air onto the surface of the soil through the air blower; S4. Collect the evaporated air and salt particles, and blow them onto the soybean seedling stems and leaves through the output end of the active tube; S5. Collect and filter part of the gas discharged from the movable pipe through the inverted L-shaped pipe, and replenish the filtered gas to the system air path; S6. After planting for the preset time, select soybean seedlings in good condition.

[0012] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: 1. This invention uses a blower inside a blower pipe to blow air onto the surface of the soil, simulating the desolate and wind-prone environment of saline-alkali land. This allows the irrigation water to dry out more quickly, similar to saline-alkali land, making the screening environment more realistic and thus improving screening accuracy and ensuring the survival rate of soybeans.

[0013] 2. This invention, during the blowing process of the air blower, ensures that the final airflow enters the lower port of the C-shaped tube, then enters the movable tube from the upper port of the C-shaped tube, and then blows from the output end of the movable tube towards the soybean seedling stems and leaves. As a result, water vapor evaporated from the soil and some salt and alkali particles carried by the water vapor are blown towards the soybean stems and leaves, and some water vapor and salt and alkali particles adhere to the soybean stems and leaves. At this time, soybean seedlings that are intolerant to salt and alkali are unlikely to survive, while soybean seedlings that are tolerant to salt and alkali are basically unaffected, significantly improving the accuracy of soybean selection.

[0014] 3. In this invention, when the blower tube is continuously venting air, the blower tube will draw air into the lower port of the inverted L-shaped tube through the second elastic hose, and the inverted L-shaped tube will draw air into the movable tube through the upper port. As a result, some of the air and salt particles discharged from the movable tube will enter the inverted L-shaped tube, and the filter element inside the inverted L-shaped tube can filter out some of the salt particles in the air, thereby reducing the amount of salt particles entering the surrounding environment.

[0015] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0016] In the attached diagram: Figure 1 This is a three-dimensional structural schematic diagram of a stress simulation device for screening salt-tolerant soybean varieties proposed in this invention. Figure 2 This is a schematic diagram of the stress simulation device for screening salt-tolerant soybean varieties proposed in this invention under usage conditions. Figure 3 This is a partial structural diagram of a stress simulation device for screening salt-tolerant soybean varieties proposed in this invention. Figure 1 ; Figure 4 This is a partial structural diagram of a stress simulation device for screening salt-tolerant soybean varieties proposed in this invention. Figure 2 ; Figure 5 This is a schematic diagram of the airflow in a stress simulation device for screening salt-tolerant soybean varieties proposed in this invention. Figure 6 This is a schematic diagram of the cross-sectional structure of the water tank in a stress simulation device for screening salt-tolerant soybean varieties proposed in this invention. Figure 7 This invention proposes a stress simulation device for screening salt-tolerant soybean varieties. Figure 6 Schematic diagram of part A in the middle; Figure 8 This is a schematic diagram of the inverted L-shaped tube structure of a stress simulation device for screening salt-tolerant soybean varieties proposed in this invention.

[0017] In the diagram: 1. Planting box; 2. Soil; 3. Air blower; 4. Main fan; 5. C-shaped pipe; 6. First flexible hose; 7. Movable pipe; 8. Inverted L-shaped pipe; 9. Second flexible hose; 10. U-shaped frame; 11. Spring; 12. First motor; 13. Cam; 14. Pull rope; 15. Spray pipe; 16. Nozzle; 17. Water tank; 18. Water pump; 19. Delivery pipe; 20. Belt; 21. Mounting groove; 22. Filter element; 23. Opening; 24. Second motor; 25. Water inlet pipe; 26. Nozzle; 27. Divider plate; 28. Permeable plate; 29. ​​Water storage chamber; 30. Support leg; 31. Perforated plate; 32. Chamfer; 33. U-shaped cover; 34. Top cover; 35. Light panel; 36. Pulley. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0019] Example 1: Refer to Figures 3-5 A stress simulation device for screening salt-tolerant soybean varieties includes a planting box 1 with an open top and a drainage pipe at the bottom for draining excess water. Soil 2 for planting soybean seedlings is laid inside the planting box 1, with the upper layer of soil having a higher salt content than the lower layer. The device also includes a blower pipe 3 installed on one side of the upper end of the planting box 1, with a main fan 4 installed inside the blower pipe 3 and the exhaust end of the blower pipe 3 facing the upper surface of the soil 2. A C-shaped pipe 5 is fixedly installed on the other side of the planting box 1, with the lower end of the C-shaped pipe 5 facing the output end of the blower pipe 3 and the upper end of the C-shaped pipe 5 facing upwards from the soil 2. In practice, a secondary fan with the same airflow direction as the main fan 4 can also be installed inside the C-shaped pipe 5. The device also includes a water supply nozzle 15 fixedly installed on the upper port of the planting box 1, with a nozzle 16 for spraying liquid at the lower end of the nozzle 15. The liquid can be ordinary tap water or water with salt and alkali components.

[0020] Specifically, when soybeans need to be screened, different soybean seedlings are planted in the soil 2 of the planting box 1. When irrigation is needed, water is sprayed onto the soil 2 through the nozzle 16 on the spray pipe 15. During the planting and screening period, the main fan 4 in the air blower 3 is turned on, so the air blower 3 can blow air onto the surface of the soil 2 to simulate the desolate and windy environment of saline-alkali land. This allows the water used for irrigation to dry out faster, just like in saline-alkali land, making the screening environment more closely resemble reality. This can improve the screening accuracy and ensure the survival rate of the soybeans.

[0021] Reference Figure 3 and Figure 5 The bottom of the planting box 1 is fixedly connected with a plurality of equally spaced partition plates 27, and a perforated plate 31 perpendicular to the partition plates 27 is fixedly connected inside the planting box 1. The height difference of the soil 2 on both sides of the perforated plate 31 is 2mm-6mm, and a chamfer 32 is provided on the upper side of the perforated plate 31 to reduce airflow resistance.

[0022] Therefore, the partition plate 27 can divide the planting box 1 into multiple planting chambers. Different soils 2 with different salinity can be used in different planting chambers, which will make the soybean screening work more flexible. Since the perforated plate 31 will make the soil 2 on both sides different in height, it can simulate the uneven state caused by the surface hardening of the saline-alkali soil 2. The raised parts will be drier, while the sunken parts are prone to water accumulation. This will make the soybean screening environment more closely resemble reality.

[0023] Reference Figure 5 The bottom of the planting box 1 is provided with a permeable plate 28 that allows water to pass through. The bottom of the permeable plate 28 is fixedly connected with a support leg 30. A water storage cavity 29 is provided between the permeable plate 28 and the bottom of the planting box 1. The soil 2 is located on the upper surface of the permeable plate 28. Thus, excess water in the soil 2 will pass through the permeable plate 28 and enter the water storage cavity 29, which can reduce the phenomenon of water accumulation and root rot in soybean seedlings.

[0024] It should be noted that, referring to Figure 1 and Figure 2 The upper end of the planting box 1 is also fixedly connected with a U-shaped cover 33 surrounding it in three directions, and an arc-shaped top cover 34 is rotatably installed on the top of the U-shaped cover 33, and a lamp panel 35 for providing lighting is installed on the lower end face of the arc-shaped top cover 34.

[0025] Example 2: Refer to Figures 5-7 A stress simulation device for screening salt-tolerant soybean varieties is basically the same as that in Example 1, but with a further improvement: The upper end of the C-shaped tube 5 is connected to the movable tube 7 via the first elastic hose 6. An inverted L-shaped tube 8 is fixedly connected to the planting box 1. The upper end of the inverted L-shaped tube 8 faces the output end of the movable tube 7. The lower end of the inverted L-shaped tube 8 is connected to the input end of the blower tube 3 via the second elastic hose 9. A filter element 22 for filtering salt and alkali particles is installed inside the inverted L-shaped tube 8.

[0026] Specifically, during the blowing process of the blower pipe 3, the final airflow enters the lower port of the C-shaped pipe 5, and then enters the movable pipe 7 from the upper port of the C-shaped pipe 5. Immediately afterwards, it is blown from the output end of the movable pipe 7 towards the soybean seedling stems and leaves. As a result, the water vapor evaporated from the soil 2 and some of the salt and alkali particles carried by the water vapor are blown towards the soybean stems and leaves. Some of the water vapor and salt and alkali particles will adhere to the soybean stems and leaves. At this time, soybean seedlings that are not tolerant to salt and alkali will have difficulty surviving, while soybean seedlings that are tolerant to salt and alkali will be basically unaffected, which significantly improves the accuracy of soybean selection.

[0027] In addition, when the blower pipe 3 continues to exhaust air, the blower pipe 3 will draw air into the lower port of the inverted L-shaped pipe 8 through the second flexible hose 9, and the inverted L-shaped pipe 8 will draw air into the movable pipe 7 through the upper port. As a result, some of the air and salt particles discharged from the movable pipe 7 will enter the inverted L-shaped pipe 8. The filter element 22 inside the inverted L-shaped pipe 8 can filter out some of the salt particles in the air, thereby reducing the amount of salt particles entering the surrounding environment. Furthermore, the gas that enters the inverted L-shaped pipe 8 will re-enter the blower pipe 3, thus achieving airflow circulation and reducing resource consumption.

[0028] Example 3: Reference Figure 4 and Figure 5 A stress simulation device for screening salt-tolerant soybean varieties is basically the same as that in Example 2, but with a further improvement: A U-shaped frame 10 is slidably installed at the bottom of the planting box 1. Both ends of the U-shaped frame 10 are fixedly connected to pull ropes 14. The ends of the two pull ropes 14 are fixedly connected to the movable tube 7 and the blower tube 3, respectively. The bottom of the planting box 1 is provided with a lifting part for driving the U-shaped frame 10 to rise and fall. The lifting part includes a first motor 12 fixedly installed at the bottom of the planting box 1. A cam 13 is fixedly installed on the output shaft of the first motor 12. The outer wall of the cam 13 is attached to the bottom of the U-shaped frame 10. A spring 11 is installed between the U-shaped frame 10 and the bottom of the planting box 1.

[0029] Specifically, during the screening process, the first motor 12 is activated, which drives the cam 13 to rotate. The cam 13 intermittently lifts the U-shaped frame 10 upwards. When the U-shaped frame 10 is lifted upwards, the exhaust end of the blower pipe 3 is lifted upwards, and the movable end of the movable pipe 7 is pulled upwards by the pull rope 14. When the cam 13 stops lifting the U-shaped frame 10, the spring 11 drives the U-shaped frame 10 to slide downwards and reset. Then, the exhaust end of the blower pipe 3 is pulled downwards and resets by the pull rope 14. The movable pipe 7 is also moved downwards and resets due to the elasticity of the first elastic hose 6. Thus, the up-and-down movement of the U-shaped frame 10 causes the blower pipe 3 and the movable pipe 7 to swing up and down, thereby significantly increasing the airflow area. This makes the environment for soybean seedling cultivation closer to reality, further improving the screening accuracy.

[0030] Example 4: Reference Figure 6 and Figure 7 A stress simulation device for screening salt-tolerant soybean varieties is basically the same as that in Example 3, but with a further improvement: A water tank 17 for storing irrigation water is fixedly installed on the planting box 1. A water pump 18 is fixedly installed on the water tank 17. The input end of the water pump 18 extends into the water tank 17, and the output end of the water pump 18 is fixedly connected to and communicates with the spray pipe 15 through the delivery pipe 19. Two pulleys 36 are installed on the outer wall of the planting box 1 and inside the water tank 17. Belts 20 are installed on the four pulleys 36. Two symmetrical mounting grooves 21 are opened on the belts 20. The filter element 22 is long and narrow. The material can be a sponge. There are two sets of filter elements 22. The other filter element 22 is located in the water tank 17, and the two sets of filter elements 22 are installed in two mounting slots 21 respectively. The side wall of the inverted L-shaped tube 8 has an opening 23. The belt 20 passes through the opening 23. A second motor 24 that drives one of the pulleys 36 to rotate is fixedly installed on the planting box 1. A water inlet pipe 25 extending into the water tank 17 is fixedly installed on the water tank 17. A nozzle 26 facing the upper surface of the filter element 22 is fixedly installed at the bottom of the water inlet pipe 25.

[0031] Specifically, after the filter element 22 has been used for a preset time, the second motor 24 is started. The second motor 24 will drive one of the pulleys 36 to rotate, and the pulley 36 will cause the belt 20 to transport the filter element 22. After the two filter elements 22 switch positions, that is, the filter element 22 in the inverted L-shaped tube 8 enters the water tank 17, and the filter element 22 in the water tank 17 enters the inverted L-shaped tube 8, the second motor 24 is turned off, and water is then supplied to the water inlet pipe 25. The water will be sprayed from the nozzle 26 at the lower end of the water inlet pipe 25 onto the upper surface of the filter element 22, thus washing the salt and alkali particles adsorbed on the filter element 22 into the water tank 17. At this time, if the water pump 18 is turned on, the water in the water tank 17 can be supplied to the spray pipe 15. The spray pipe 15 can spray water with salt and alkali properties onto the soil 2, thereby realizing the recovery and utilization of salt and alkali particles.

[0032] Example 5: Refer to Figures 1-8 A method for using a stress simulation device for screening salt-tolerant soybean varieties includes the following steps: S1. Plant different soybean seedlings in the soil 2 of planting box 1; S2. Water is sprayed onto the soil 2 through the nozzle 16 on the nozzle 15; S3. Blow air onto the surface of the soil 2 through the air blower 3; S4. Collect the evaporated air and salt particles, and blow them onto the stems and leaves of soybean seedlings through the output end of the active tube 7. S5. Collect and filter part of the gas discharged from the movable pipe 7 through the inverted L-shaped pipe 8, and replenish the filtered gas to the system air path; S6. After planting for the preset time, select soybean seedlings in good condition.

[0033] When soybeans need to be screened, different soybean seedlings are planted in the soil 2 of the planting box 1. When irrigation is needed, water is sprayed onto the soil 2 through the nozzle 16 on the spray pipe 15. During the planting and screening period, the main fan 4 in the air blower 3 is turned on, so that the air blower 3 can blow air onto the surface of the soil 2 to simulate the desolate and windy environment of saline-alkali land. This allows the irrigation water to dry out faster like in saline-alkali land, making the screening environment more closely resemble reality, thereby improving the screening accuracy and ensuring the survival rate of subsequent soybeans.

[0034] During the blowing process of the air blower 3, the final airflow will enter the lower port of the C-shaped tube 5, and then enter the movable tube 7 from the upper port of the C-shaped tube 5. Then, it will be blown from the output end of the movable tube 7 towards the soybean seedling stems and leaves. As a result, the water vapor evaporated from the soil 2 and some of the salt and alkali particles carried by the water vapor will be blown towards the soybean stems and leaves. Some of the water vapor and salt and alkali particles will adhere to the soybean stems and leaves. At this time, soybean seedlings that are not tolerant to salt and alkali will have difficulty surviving, while soybean seedlings that are tolerant to salt and alkali will be basically unaffected, which significantly improves the accuracy of soybean selection.

[0035] When the blower pipe 3 continuously exhausts air, it draws air into the lower port of the inverted L-shaped pipe 8 through the second flexible hose 9. The inverted L-shaped pipe 8 then draws air into the movable pipe 7 through its upper port. As a result, some of the air and salt particles discharged from the movable pipe 7 enter the inverted L-shaped pipe 8. The filter element 22 inside the inverted L-shaped pipe 8 can filter out some of the salt particles in the air, thereby reducing the amount of salt particles entering the surrounding environment. Furthermore, the air that enters the inverted L-shaped pipe 8 will re-enter the blower pipe 3, thus achieving airflow circulation and reducing resource consumption.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been described above with reference to preferred embodiments, it is not intended to limit the present invention. Any modifications or alterations made by those skilled in the art without departing from the scope of the present invention using the above-described technical content can be considered as equivalent embodiments. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A stress simulation device for screening salt-tolerant soybean varieties, comprising a planting box (1) filled with soil (2), characterized in that, Also includes: The air blower (3) is installed on one side of the upper end of the planting box (1). The blower pipe (3) is equipped with a main fan (4), and the exhaust end of the blower pipe (3) faces the upper surface of the soil (2). A C-shaped pipe (5) is fixedly installed on the other side of the planting box (1). The lower end of the C-shaped pipe (5) faces the output end of the blower pipe (3), and the upper end of the C-shaped pipe (5) faces the top of the soil (2). The nozzle (15) is fixedly installed on the upper port of the planting box (1), and the nozzle (16) is installed at the lower end of the nozzle (15).

2. The stress simulation device for screening salt-tolerant soybean varieties according to claim 1, characterized in that, The upper end of the C-shaped tube (5) is connected to the movable tube (7) through the first elastic hose (6). The planting box (1) is fixedly connected to the inverted L-shaped tube (8). The upper end of the inverted L-shaped tube (8) faces the output end of the movable tube (7). The lower end of the inverted L-shaped tube (8) is connected to the input end of the blower tube (3) through the second elastic hose (9). A filter element (22) is provided inside the inverted L-shaped tube (8).

3. The stress simulation device for screening salt-tolerant soybean varieties according to claim 2, characterized in that, The bottom of the planting box (1) is slidably fitted with a U-shaped frame (10). Both ends of the U-shaped frame (10) are fixedly connected to pull ropes (14). The ends of the two pull ropes (14) are fixedly connected to the movable tube (7) and the blower tube (3) respectively. The bottom of the planting box (1) is provided with a lifting part for driving the U-shaped frame (10) to rise and fall.

4. The stress simulation device for screening salt-tolerant soybean varieties according to claim 3, characterized in that, The lifting unit includes a first motor (12) fixedly installed at the bottom of the planting box (1). The output shaft of the first motor (12) is fixedly mounted with a cam (13). The outer wall of the cam (13) is attached to the bottom of the U-shaped frame (10). A spring (11) is installed between the U-shaped frame (10) and the bottom of the planting box (1).

5. The stress simulation device for screening salt-tolerant soybean varieties according to claim 2, characterized in that, A water tank (17) is fixedly installed on the planting box (1), and a water pump (18) is fixedly installed on the water tank (17). The input end of the water pump (18) extends into the water tank (17), and the output end of the water pump (18) is fixedly connected to the spray pipe (15) through the delivery pipe (19).

6. The stress simulation device for screening salt-tolerant soybean varieties according to claim 5, characterized in that, Two pulleys (36) are installed on the outer wall of the planting box (1) and inside the water tank (17). A belt (20) is installed on the four pulleys (36). Two symmetrical mounting slots (21) are opened on the belt (20). The filter element (22) is long and narrow. There are two sets of filter elements (22). The other filter element (22) is located inside the water tank (17). The two sets of filter elements (22) are installed in the two mounting slots (21) respectively. The side wall of the inverted L-shaped tube (8) has an opening (23). The belt (20) passes through the opening (23). A second motor (24) that drives one of the pulleys (36) to rotate is fixedly installed on the planting box (1).

7. The stress simulation device for screening salt-tolerant soybean varieties according to claim 6, characterized in that, A water inlet pipe (25) extending into the water tank (17) is fixedly installed on the water tank (17), and a nozzle (26) facing the upper surface of the filter element (22) is fixedly installed at the bottom of the water inlet pipe (25).

8. The stress simulation device for screening salt-tolerant soybean varieties according to claim 1, characterized in that, The bottom of the planting box (1) is fixedly connected with a plurality of equally spaced partition plates (27), and a perforated plate (31) perpendicular to the partition plates (27) is fixedly connected inside the planting box (1). The height difference between the soil (2) on both sides of the perforated plate (31) is 2mm-6mm.

9. The stress simulation device for screening salt-tolerant soybean varieties according to claim 1, characterized in that, The bottom of the planting box (1) is provided with a permeable plate (28), and the bottom of the permeable plate (28) is fixedly connected with a support leg (30). A water storage cavity (29) is provided between the permeable plate (28) and the bottom of the planting box (1). The soil (2) is located on the upper surface of the permeable plate (28).

10. A method of using a stress simulation device for screening salt-tolerant soybean varieties, characterized in that, The stress simulation device for screening salt-tolerant soybean varieties as described in claim 2 includes the following steps: S1. Plant different soybean seedlings in the soil (2) of the planting box (1); S2. Water is sprayed onto the soil (2) through the nozzle (16) on the nozzle (15); S3. Blow air onto the surface of the soil (2) through the air blower (3); S4. Collect the evaporated air and salt particles, and blow them onto the stems and leaves of soybean seedlings through the output end of the active tube (7); S5. Collect and filter part of the gas discharged from the movable pipe (7) through the inverted L-shaped pipe (8), and replenish the filtered gas to the system air path; S6. After planting for the preset time, select soybean seedlings in good condition.

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