Farmland irrigation fertilizer blending device

By using a venturi pipe and a branch pipeline system to mix fertilizer and water during irrigation, the problem of fertilizer preparation requiring prior irrigation in existing technologies is solved, improving operational efficiency and reducing equipment space requirements.

CN223885712UActive Publication Date: 2026-02-10CHONGQING SATLIC TECH DEV
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Patent Information

Application Number
CN202520216432.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-11
Publication Date
2026-02-10
Estimated Expiration
2035-02-11

AI Technical Summary

Technical Problem

Existing fertigation systems require fertilizer to be prepared before irrigation, making it impossible to prepare fertilizer simultaneously with irrigation. This results in time-consuming operations, and the weighing and dilution tanks take up a lot of space.

Method used

A fertilizer mixing device for farmland irrigation was designed. It uses a Venturi tube and a distribution pipeline system to mix the liquid fertilizer in the fertilizer tank with the irrigation water. The real-time mixing of fertilizer is achieved through the Venturi effect, and the fertilizer is mixed and applied during the irrigation process.

Benefits of technology

It enables real-time fertilizer dispensing during irrigation, reducing reliance on symmetrical weighing and dilution tanks, improving work efficiency, reducing space occupation, and eliminating the need for secondary fertilizer dilution.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model relates to a farmland irrigation fertilizer blending device. Comprising a water pump, a water supply pipeline connected to the water inlet end of the water pump, an irrigation pipeline connected to the water outlet end of the water pump, a flow dividing pipeline with one end connected with the irrigation pipeline and the other end connected with the water supply pipeline, a Venturi tube arranged on the flow dividing pipeline and a fertilizer supply pipeline connected to the throat position of the Venturi tube. The flow dividing pipeline is used for dividing water in the irrigation pipeline and guiding the divided water into the water supply pipeline, and the fertilizer supply pipeline is used for guiding liquid fertilizer in the fertilizer barrel into the Venturi tube. Due to the adoption of the technical scheme, the farmland irrigation fertilizer blending device disclosed by the utility model can fertilize a farmland while irrigating the farmland, can blend the fertilizer when irrigating the farmland, and is more convenient and time-saving when irrigating the farmland.
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Description

TECHNICAL FIELD

[0001] The utility model relates to agricultural equipment technical field, concretely relates to a farmland irrigation fertilizer blending device. BACKGROUND

[0002] Water and fertilizer integration technology is a new agricultural technology that integrates irrigation and fertilization. Water and fertilizer integration technology uses a pressure irrigation system to mix fertilizer and irrigation water, and then forms drip irrigation or sprinkler irrigation through pipes and emitters, which can uniformly, regularly and quantitatively irrigate the root development and growth area of crops. This technology can provide water and nutrients directly to crops in a timely, quantitative and proportional manner according to the fertilizer requirements of crops and the soil environment.

[0003] The current water and fertilizer integration system includes a fertilizer mixing machine, fertilizer barrels, a weighing barrel, a dilution barrel and a pipeline system. The fertilizer barrels are usually multiple, and the multiple fertilizer barrels are used to hold different types of liquid fertilizer. Before using the water and fertilizer integration system to irrigate and fertilize farmland, the fertilizer mixing machine is used to send water and different types of fertilizer into the weighing barrel according to the set ratio, and then the fertilizer mixing machine is used to send the fertilizer in the weighing barrel into the dilution barrel for secondary dilution to complete the blending of the fertilizer. After the blending of the fertilizer is completed, the fertilizer in the dilution barrel is sent to the farmland to achieve irrigation and fertilization of the farmland.

[0004] The existing water and fertilizer integration system must first blend the fertilizer before irrigation, which cannot blend the fertilizer at the same time as irrigation. The fertilizer needs to be blended first, and then the farmland is irrigated. This is time-consuming when irrigating the farmland. The weighing barrel and the dilution barrel in the existing water and fertilizer integration system occupy a large space. SUMMARY

[0005] Therefore, the purpose of the utility model is to provide a farmland irrigation fertilizer blending device to solve the technical problem that the existing water and fertilizer integration system must first blend the fertilizer before irrigation, which cannot blend the fertilizer at the same time as irrigation, and is time-consuming when blending the fertilizer.

[0006] The utility model realizes the following technical scheme:

[0007] A farmland irrigation fertilizer blending device, comprising a water pump, a water supply pipeline connected to the water inlet end of the water pump, an irrigation pipeline connected to the water outlet end of the water pump, a shunt pipeline with one end connected to the irrigation pipeline and the other end connected to the water supply pipeline, a Venturi tube provided on the shunt pipeline, and a fertilizer supply pipeline connected to the throat position of the Venturi tube, the shunt pipeline is used to shunt the water in the irrigation pipeline and guide the shunted water into the water supply pipeline, and the fertilizer supply pipeline is used to guide the liquid fertilizer in the fertilizer barrel into the Venturi tube.

[0008] Further, the Venturi tubes are multiple, and the multiple Venturi tubes are arranged on the shunt pipeline.

[0009] Further, the shunt pipeline comprises a first pipe body in communication with the irrigation pipeline, a second pipe body in communication with the water supply pipeline, and multiple third pipe bodies connected at one end to the first pipe body and at the other end to the second pipe body, and the multiple Venturi tubes are arranged one-to-one on the multiple third pipe bodies.

[0010] Further, the second pipe body is provided with a valve.

[0011] Further, the fertilizer supply pipeline is provided with a high-frequency electromagnetic valve, and the first pipe body is provided with a PH sensor and an EC sensor; and the controller, the high-frequency electromagnetic valve, the PH sensor, and the EC sensor are electrically connected to the controller.

[0012] Further, a pressure transmitter is further included, which is arranged on the irrigation pipeline and located between the position where the shunt pipeline is connected to the irrigation pipeline and the water outlet end of the water pump.

[0013] Further, a pressure holding valve is further included, which is arranged on the irrigation pipeline and located on the side opposite to the water outlet end of the water pump at the position where the shunt pipeline is connected to the irrigation pipeline.

[0014] Further, a filter is further included, which is arranged on the irrigation pipeline and located between the position where the shunt pipeline is connected to the irrigation pipeline and the water outlet end of the water pump.

[0015] Further, the irrigation pipeline comprises a first irrigation pipe segment connected between the water inlet end of the filter and the water pump, and a second irrigation pipe segment connected to the water outlet end of the filter; and the filter comprises a laminated filter and a mixing part, the water inlet end of the laminated filter being the water inlet end of the filter, the mixing part being connected to the water outlet end of the laminated filter and the second irrigation pipe segment, the mixing part being used for guiding the water mixed with the fertilizer discharged from the laminated filter into the second irrigation pipe segment, and the mixing part being further used for mixing the water mixed with the fertilizer flowing through the inside thereof.

[0016] Further, the mixing part comprises a mixing part body, a water inlet channel, two water distribution channels, a mixing cavity and a water outlet channel, the water inlet channel is connected with the water outlet end of the laminated filter, the two water distribution channels are symmetrically arranged on the two sides of the water inlet channel, one end of the water distribution channel is communicated with the water inlet channel, the other end of the water distribution channel is communicated with the mixing cavity, the ports of the other ends of the two water distribution channels are opposite to each other, one end of the water outlet channel is connected with the mixing cavity, and the other end of the water outlet channel is connected with the second irrigation pipe section.

[0017] The utility model discloses beneficial effect lies in:

[0018] The farmland irrigation fertilizer blending device can fertilize farmland while irrigating farmland, can blend fertilizer while irrigating farmland, does not need to dilute fertilizer secondly, directly discharges water mixed with fertilizer to plant, is more convenient, saves time when irrigating farmland, can improve work efficiency.

[0019] The other advantages, objects and features of the utility model will be set forth in the subsequent description, and to some extent, it will be obvious to those skilled in the art based on the study of the following, or can be taught from the practice of the utility model. The objects and other advantages of the utility model can be realized and obtained by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is the structure schematic drawing when the farmland irrigation fertilizer blending device of the utility model is observed from one angle.

[0021] Fig. 2 It is the structure schematic drawing when the farmland irrigation fertilizer blending device of the utility model is observed from another angle.

[0022] Fig. 3 It is the sectional view of the mixing part body in the farmland irrigation fertilizer blending device of the utility model.

[0023] In the figure: water pump-1; water supply pipeline-2; fertilizer supply pipeline-3; first pipe body-4; second pipe body-5; third pipe body-6; valve-7; high-frequency electromagnetic valve-8; PH sensor-9; EC sensor-10; controller-11; first filter-12; exhaust valve-13; display-14; sampling valve-15; second pressure transmitter-16; pressure maintaining valve-17; first irrigation pipe section-18; second irrigation pipe section-19; laminated filter-20; mixing part body-21; water inlet channel-22; shunt channel-23; mixing cavity-24; water outlet channel-25; venturi-26. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0026] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] In the above description of the present application, it should be noted that the orientation or position relationship indicated by the terms "one side", "the other side" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0028] In addition, the term "same" and the like do not mean that the components must be absolutely the same, but there can be slight differences. The term "vertical" only means that the position relationship between the components is relatively more vertical than "parallel", and does not mean that the structure must be completely vertical, but can be slightly inclined.

[0029] Please refer to Figs. 1-3 The utility model provides a technical scheme: a farmland irrigation fertilizer blending device, including water pump 1, the water supply line 2 of connecting in water pump 1 water inlet end, the irrigation pipeline of connecting in water pump 1 water outlet end, one end is connected irrigation pipeline, the shunt pipeline of another end connection water supply line 2, be located on the venturi tube 26 of shunt pipeline and be connected in the throat position of venturi tube 26 and supply fertilizer pipeline 3, the shunt pipeline is used to the water in irrigation pipeline is shunted and is guided into to water supply line 2 after shunting, the supply fertilizer pipeline 3 is used to the liquid fertilizer in fertilizer barrel is guided into to venturi tube 26.

[0030] Before using the farmland irrigation fertilizer blending device of the utility model to carry out farmland irrigation, the water supply line 2 is connected to the water source, and the fertilizer supply line 3 is connected to the fertilizer barrel containing liquid fertilizer.

[0031] When using the farmland irrigation fertilizer blending device of the utility model to carry out farmland irrigation, the water pump 1 is started, and under the pumping action of the water pump 1, the water of the water source enters the irrigation pipeline and is discharged to the farmland through the irrigation pipeline to irrigate the farmland. In the process of irrigating the farmland, part of the water in the irrigation pipeline can be returned to the water supply line 2 through the shunt pipeline. During the water flow through the shunt pipeline, the water will pass through the venturi tube 26, forming a negative pressure at the throat position of the venturi tube 26, and the liquid fertilizer in the fertilizer barrel can be sucked into the venturi tube 26 through the fertilizer supply line 3. The liquid fertilizer entering the venturi tube 26 can mix with the water flowing through the shunt pipeline and enter the water supply line 2 with the water in the shunt pipeline. The fertilizer mixes with the water in the water supply line 2 when entering the water supply line 2, so that the water entering the irrigation pipeline is mixed with liquid fertilizer, and the water discharged to the farmland through the irrigation pipeline is mixed with fertilizer.

[0032] The farmland irrigation fertilizer blending device can irrigate and fertilize the farmland at the same time, and can blend fertilizer when irrigating the farmland, without the need for secondary dilution of the fertilizer. The water mixed with the fertilizer is directly discharged to the plant, which is more convenient and time-saving when irrigating the farmland, and can improve work efficiency. When using the farmland irrigation fertilizer blending device of the utility model to blend fertilizer, a weighing barrel and a dilution barrel are not needed, which can reduce the occupation of space.

[0033] Since one end of the diversion pipe is connected to the irrigation pipe and the other end is connected to the water supply pipe 2, during the operation of the water pump 1, the pressure in the irrigation pipe is positive, and the pressure in the water supply pipe 2 is negative. This allows a portion of the water in the irrigation pipe to be smoothly diverted to the diversion pipe and then returned to the water supply pipe 2.

[0034] In this embodiment, there are multiple Venturi tubes 26, all of which are located on the branch pipe. There are also multiple fertilizer supply pipes 3, which are connected one-to-one to the throat positions of the multiple Venturi tubes 26.

[0035] Before irrigating farmland using the farmland irrigation fertilizer mixing device of this invention, multiple fertilizer supply pipes 3 can be connected one-to-one to multiple fertilizer tanks containing liquid fertilizer, with each tank containing a different type of fertilizer. When irrigating farmland using the farmland irrigation fertilizer mixing device of this invention, the liquid fertilizer in each of the multiple fertilizer tanks can be drawn one-to-one through the multiple fertilizer supply pipes 3 into the corresponding Venturi tubes 26. The liquid fertilizer entering each Venturi tube 26 can mix with the water flowing through the branch pipes and enter the water supply pipes 2 along with the water in the branch pipes, ensuring that the water discharged into the farmland through the irrigation pipes is water mixed with multiple fertilizers. Therefore, when irrigating farmland, the farmland irrigation fertilizer mixing device of this invention can simultaneously mix multiple fertilizers in the water.

[0036] In this embodiment, the diversion pipeline includes a first pipe body 4 connected to the irrigation pipeline, a second pipe body 5 connected to the water supply pipeline 2, and multiple third pipe bodies 6 connected at one end to the first pipe body 4 and at the other end to the second pipe body 5. The multiple Venturi tubes 26 are respectively arranged on the multiple third pipe bodies 6.

[0037] During the process of a portion of the water in the irrigation pipeline returning to the water supply pipeline 2 via the diversion pipeline, a portion of the water in the irrigation pipeline can first enter the first pipe body 4. The water flowing through the first pipe body 4 can be diverted to multiple third pipe bodies 6. The water flowing through the multiple third pipe bodies 6 can converge to the second pipe body 5 and then flow back to the water supply pipeline 2 from the second pipe body 5. Since multiple venturi tubes 26 are correspondingly arranged on multiple third pipe bodies 6, when water flows through multiple third pipe bodies 6, the liquid fertilizer in multiple fertilizer tanks can be correspondingly drawn into the corresponding venturi tube 26 through multiple fertilizer supply pipelines 3.

[0038] In this embodiment, the second pipe body 5 is equipped with a valve 7. When the valve 7 is closed, the water in the irrigation pipeline cannot enter the diversion pipeline. At this time, the venturi tube 26 cannot draw the liquid fertilizer in the fertilizer tank into the diversion pipeline. When the valve 7 is closed, the farmland irrigation fertilizer mixing device of this invention can irrigate the farmland without fertilizing it.

[0039] In this embodiment, the fertilizer supply pipeline 3 is equipped with a high-frequency solenoid valve 8, which may be a high-frequency solenoid valve 8 of model HOPE91. The first pipe body 4 is equipped with a pH sensor 9 and an EC sensor 10. It also includes a controller 11, which may be a PLC controller 11. The high-frequency solenoid valve 8, the pH sensor 9 and the EC sensor 10 are all electrically connected to the controller 11.

[0040] The pH sensor 9 and the EC sensor 10 can respectively detect the pH value and EC value of the water diverted from the irrigation pipeline to the first pipe body 4. The pH sensor 9 and the EC sensor 10 can also convert the pH value and EC value parameters into electrical signals and transmit them to the controller 11. The controller 11 can compare the preset pH value and EC value parameters with the received pH value and EC value parameters. When the preset pH value and EC value parameters are different from the received pH value and EC value parameters, the controller 11 can control the opening degree of the high-frequency solenoid valve 8, thereby adjusting the speed at which liquid fertilizer enters the diversion pipeline through the fertilizer supply pipeline 3, and can more accurately control the fertilizer ratio in the water discharged from the irrigation pipeline to the farmland.

[0041] In this embodiment, a first filter 12 is provided on the fertilizer supply pipeline 3. The first filter 12 can filter solid impurities in the liquid fertilizer that enters the Venturi tube 26 through the fertilizer tank.

[0042] In this embodiment, an exhaust valve 13 is provided on the first pipe body 4, which is used to discharge the gas inside the first pipe body 4. By discharging the gas inside the first pipe body 4 through the exhaust valve 13, water hammer and cavitation are less likely to occur in the diversion pipeline and irrigation pipeline.

[0043] In this embodiment, the farmland irrigation fertilizer mixing device of the present invention further includes a display 14, which is electrically connected to the controller 11. The display 14 can display the pH value and EC value detected by the pH sensor 9 and the EC sensor 10.

[0044] In this embodiment, a sampling valve 15 is provided on the first tube 4. A certain amount of water sample can be taken from the first tube 4 through the sampling valve 15 and sent to the laboratory to test the pH and EC values ​​of the water sample. Then, the pH and EC values ​​detected in the laboratory are compared with the pH and EC values ​​detected by the pH sensor 9 and the EC sensor 10 to determine whether the pH and EC values ​​detected by the pH sensor 9 and the EC sensor 10 are correct.

[0045] In this embodiment, the farmland irrigation fertilizer dispensing device of this utility model further includes a first pressure transmitter. The first pressure transmitter is disposed on the irrigation pipeline and located between the location where the branch pipeline connects to the irrigation pipeline and the outlet end of the water pump 1. The pressure in the irrigation pipeline can be measured through the first pressure transmitter.

[0046] In this embodiment, a second pressure transmitter 16 is also provided on the first pipe body 4. The pressure inside the first pipe body 4 can be measured by the second pressure transmitter 16.

[0047] In this embodiment, the farmland irrigation fertilizer mixing device of this utility model further includes a pressure-holding valve 17 disposed on the irrigation pipeline. The pressure-holding valve 17 is located on the side opposite to the outlet end of the water pump 1 where the branch pipeline connects to the irrigation pipeline. The pressure-holding valve 17 is used to control the fluid pressure in the irrigation pipeline, and can reduce the pressure on the side of the irrigation pipeline opposite to the water pump 1 located on the pressure-holding valve 17 to the required pressure range, thereby protecting downstream equipment of the irrigation pipeline from damage caused by excessive pressure.

[0048] In this embodiment, the farmland irrigation fertilizer mixing device of the present invention further includes a second filter disposed on the irrigation pipeline. The second filter is located between the location where the diversion pipeline connects to the irrigation pipeline and the outlet end of the water pump 1.

[0049] The second filter can filter the water discharged from the water pump 1 into the irrigation pipeline. When the water entering the water supply pipe from the water source and the water mixed with fertilizer entering the water supply pipe from the branch pipe pass through the second filter, the fertilizer and water can be mixed more evenly. This allows the pH value and EC value detected by the pH sensor 9 and the EC sensor 10 to more accurately reflect the actual pH value and EC value of the water flowing through the irrigation pipeline.

[0050] In this embodiment, a flow meter is installed on the irrigation pipeline, and the flow meter is located on the side of the branch pipeline opposite to the outlet end of the water pump 1. By installing the flow meter, the amount of water discharged from the irrigation pipeline to the farmland can be monitored.

[0051] In this embodiment, the irrigation pipeline includes a first irrigation pipe section 18 connecting the inlet end of the second filter and the water pump 1, and a second irrigation pipe section 19 connecting the outlet end of the second filter; the second filter includes a disc filter 20 and a mixing section, the inlet end of the disc filter 20 is the same as the inlet end of the second filter, the mixing section connects the outlet end of the disc filter 20 and the second irrigation pipe section, the mixing section is used to guide the water mixed with fertilizer discharged from the disc filter 20 into the second irrigation pipe section, and the mixing section is also used to mix the water mixed with fertilizer flowing through its interior.

[0052] After the water mixed with fertilizer is discharged from the outlet of the water pump 1, it passes sequentially through the first irrigation pipe section 18, the disc filter 20, and the mixing section before entering the second irrigation pipe section 19. As the water flows through the disc filter 20, it mixes the fertilizer and water. As the water flows through the mixing section, the mixing section further mixes the fertilizer and water, making the mixture more uniform. This allows the pH sensor 9 and the EC sensor 10 to more accurately reflect the actual pH and EC values ​​of the water flowing through the irrigation pipe.

[0053] In this embodiment, the mixing section includes a mixing section body 21, an inlet channel 22, a diversion channel 23, a mixing chamber 24, and an outlet channel 25. The inlet channel 22 is connected to the outlet end of the disc filter 20. There are two diversion channels 23, which are symmetrically arranged on both sides of the inlet channel 22. One end of the diversion channel 23 is connected to the inlet channel 22, and the other end of the diversion channel 23 is connected to the mixing chamber 24. The ports of the other ends of the two diversion channels 23 are directly opposite each other. One end of the outlet channel 25 is connected to the mixing chamber 24, and the other end is connected to the second irrigation pipe section 19.

[0054] When water mixed with fertilizer flows through the mixing section, it passes through the disc filter 20 and enters the inlet channel 22. The fertilizer-mixed water in the inlet channel 22 is divided into two streams by two diversion channels 23, flowing into the mixing chamber 24. The water exiting from the two diversion channels 23 impacts each other, further mixing the fertilizer and water. Then, the water in the mixing chamber 24 is discharged from the outlet channel 25 into the second irrigation pipe section 19. With this structure, the mixing section can mix the fertilizer-mixed water flowing through it.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A fertilizer mixing device for farmland irrigation, characterized in that: The system includes a water pump, a water supply pipeline connected to the water pump inlet, an irrigation pipeline connected to the water pump outlet, a branch pipeline connected at one end to the irrigation pipeline and at the other end to the water supply pipeline, a venturi tube installed on the branch pipeline, and a fertilizer supply pipeline connected to the throat of the venturi tube. The branch pipeline is used to divert water in the irrigation pipeline and guide the diverted water to the water supply pipeline, and the fertilizer supply pipeline is used to guide liquid fertilizer from the fertilizer tank to the venturi tube.

2. The farmland irrigation fertilizer mixing device according to claim 1, characterized in that: There are multiple Venturi tubes, all of which are located on the branch pipe. There are also multiple fertilizer supply pipes, which are connected one-to-one to the throat positions of the multiple Venturi tubes.

3. The farmland irrigation fertilizer mixing device according to claim 2, characterized in that: The diversion pipeline includes a first pipe body connected to the irrigation pipeline, a second pipe body connected to the water supply pipeline, and multiple third pipe bodies with one end connected to the first pipe body and the other end connected to the second pipe body. The multiple Venturi tubes are correspondingly arranged on the multiple third pipe bodies.

4. The farmland irrigation fertilizer mixing device according to claim 3, characterized in that: The second pipe body is equipped with a valve.

5. The farmland irrigation fertilizer mixing device according to claim 3, characterized in that: The fertilizer supply pipeline is equipped with a high-frequency solenoid valve, and the first pipe body is equipped with a pH sensor and an EC sensor; it also includes a controller, and the high-frequency solenoid valve, the pH sensor and the EC sensor are all electrically connected to the controller.

6. The farmland irrigation fertilizer mixing device according to claim 1, characterized in that: It also includes a pressure transmitter, which is installed on the irrigation pipeline and located between the branch pipeline connecting to the irrigation pipeline and the outlet of the water pump.

7. The farmland irrigation fertilizer mixing device according to claim 1, characterized in that: It also includes a pressure-holding valve installed on the irrigation pipeline, the pressure-holding valve being located on the side opposite to the water pump outlet at the location where the diversion pipeline connects to the irrigation pipeline.

8. The farmland irrigation fertilizer mixing device according to claim 1, characterized in that: It also includes a filter installed on the irrigation pipeline, the filter being located between the location where the branch pipeline connects to the irrigation pipeline and the outlet end of the water pump.

9. The farmland irrigation fertilizer mixing device according to claim 1, characterized in that: The irrigation pipeline includes a first irrigation pipe section connecting the inlet end of the filter and the water pump, and a second irrigation pipe section connecting the outlet end of the filter; the filter includes a disc filter and a mixing section, the inlet end of the disc filter is the same as the inlet end of the filter, the mixing section connects the outlet end of the disc filter and the second irrigation pipe section, the mixing section is used to guide the water mixed with fertilizer discharged from the disc filter into the second irrigation pipe section, and the mixing section is also used to mix the water mixed with fertilizer flowing through its interior.

10. The farmland irrigation fertilizer mixing device according to claim 1, characterized in that: The mixing section includes a mixing section body, an inlet channel, a branch channel, a mixing chamber, and an outlet channel. The inlet channel is connected to the outlet end of the disc filter. There are two branch channels, which are symmetrically arranged on both sides of the inlet channel. One end of each branch channel is connected to the inlet channel, and the other end is connected to the mixing chamber. The ports of the other ends of the two branch channels are directly opposite each other. One end of the outlet channel is connected to the mixing chamber, and the other end is connected to the second irrigation pipe section.