Liquid fertilizer site application apparatus

Abstract

The utility model provides a kind of liquid fertilizer fixed point application device, including mobile car body, fertilizer box and liquid pump, and controller, the distance between ultrasonic sensor detection mobile car body and two sides rubber tree trunk is signal transmission to controller;Optical tracking sensor identifies the ground path feature between rubber tree rows and signal transmission to controller;Color camera gathers the image information of front crop, infrared ranging sensor measures the vertical distance with target point, and information transmission to controller;Fertilization execution component is connected with the outlet of liquid pump by pipeline;Controller receives signal from ultrasonic sensor, optical tracking sensor, color camera and infrared ranging sensor, controls the travel of mobile car body and the orientation of fertilization end of fertilization execution component. Overcome the problem of complex light by a variety of sensors and controller combination, accurately position the position of fertilization point, ensure that fertilizer can be accurately applied in crop root system, greatly improve fertilizer efficiency.

Description

Technical Field

[0001] This utility model relates to the field of agricultural technology, and in particular to a device for targeted application of liquid fertilizer. Background Technology

[0002] Rubber plantations possess abundant understory land resources, and developing understory economy is an important way to help growers increase output value and improve economic benefits. The dominant model in rubber plantation economy is understory planting, i.e., intercropping, with crops such as bananas, peppers, cardamom, and coffee currently widely planted. These intercropped crops coexist with rubber trees, and their growth space, light, and nutrient access are all somewhat limited. Therefore, precise and efficient fertilization management is a key measure to ensure the normal growth of understory crops and improve overall yield. An ideal fertilization plan requires the ability to dynamically adjust the location, depth, and pattern of fertilization according to crop type, growth cycle, and fertilizer characteristics, thereby achieving concentrated fertilizer effectiveness and avoiding resource waste and environmental pollution.

[0003] Currently, fertilization operations in rubber plantation intercropping still predominantly rely on traditional manual labor or simple machinery. The common practice involves operators carrying backpack or hand-pushed fertilizer applicators, moving through the rubber trees, visually determining the location of each intercropped plant, and manually controlling the fertilizer applicator or nozzle for irrigation. For crops requiring deeper application, a handheld drill is used to create holes, which are then manually injected into the holes – a cumbersome process. The accuracy of the entire fertilization process – including the distance between the fertilization point and the crop roots, the fertilization depth, and the amount of fertilizer applied to each plant – is highly dependent on the operator's responsibility, skill, and fatigue level, making it a labor-intensive and low-automation operation.

[0004] However, existing simple mechanical fertilization methods generally have a low level of intelligence and rely heavily on the personal experience of operators. The determination of fertilization location depends entirely on human observation and manual operation, which makes it difficult to meet the needs of precision agriculture and results in low fertilizer utilization efficiency. Utility Model Content

[0005] Therefore, it is necessary to provide a liquid fertilizer application device to address the aforementioned technical problems.

[0006] A liquid fertilizer application device includes a mobile vehicle, a fertilizer tank and a liquid pump mounted on the mobile vehicle, and a controller, wherein the inlet of the liquid pump is connected to the outlet of the fertilizer tank.

[0007] An ultrasonic sensor is installed at the front end of the mobile vehicle body, with the detection direction of the ultrasonic sensor facing the side front. It is used to detect the distance between the mobile vehicle body and the trunks of the rubber trees on both sides and transmit the signal to the controller.

[0008] An optical tracking sensor is installed at the bottom of the mobile vehicle body. The detection direction of the optical tracking sensor is perpendicular to the ground. It is used to identify the ground path features between the rubber tree rows and transmit the signal to the controller.

[0009] A color camera and an infrared ranging sensor are provided. The color camera is used to acquire image information of crops in front, and the infrared ranging sensor is used to measure the vertical distance to the target point and transmit the information to the controller.

[0010] A fertilizer application execution component is mounted on the mobile vehicle body, and the fertilizer application execution component is connected to the outlet of the liquid pump via a pipeline;

[0011] The controller receives signals from the ultrasonic sensor, the optical tracking sensor, the color camera, and the infrared ranging sensor, and controls the movement of the mobile vehicle and the orientation of the fertilization end of the fertilization execution component.

[0012] In one embodiment, the fertilization execution component includes:

[0013] A Y-axis linear slide bar is mounted on the support of the moving vehicle body. A Y-axis slider is slidably mounted on the Y-axis linear slide bar. The movement direction of the Y-axis slider is parallel to the travel direction of the moving vehicle body.

[0014] An X-axis linear slide bar is mounted on the Y-axis slider, and an X-axis slider is slidably mounted on the X-axis linear slide bar. The movement direction of the X-axis slider is perpendicular to the travel direction of the moving vehicle.

[0015] A Z-axis linear slider is mounted on the X-axis slider, and a Z-axis slider is slidably mounted on the Z-axis linear slider. The Z-axis slider moves in a direction perpendicular to the ground.

[0016] The fertilization end of the fertilization execution component is located on the Z-axis slider.

[0017] In one embodiment, the fertilizer tank includes a main fertilizer tank and a secondary fertilizer tank, wherein the main fertilizer tank and the secondary fertilizer tank are respectively filled with liquid fertilizers for different crops;

[0018] The liquid pump includes a first liquid pump and a second liquid pump. The inlet of the first liquid pump is connected to the main fertilizer tank through a pipeline, and the inlet of the second liquid pump is connected to the auxiliary fertilizer tank through a pipeline. The first liquid pump and the second liquid pump are controlled by the controller.

[0019] In one embodiment, both the main fertilizer tank and the auxiliary fertilizer tank are equipped with stirring blades, which are connected to the output shaft of a micro motor located outside the tank via a rotating shaft.

[0020] In one embodiment, the outlet of the first liquid pump is provided with a fertilizer injection needle through a connecting pipe, and the side wall of the fertilizer injection needle has several fertilizer outlet holes.

[0021] In one embodiment, the end of the fertilizer injection needle is provided with a micro-auger bit.

[0022] In one embodiment, a high-frequency micro-vibrator is provided on the wall of the fertilizer injection needle, and the wires of the high-frequency micro-vibrator are electrically connected to the controller.

[0023] In one embodiment, the outlet of the second liquid pump is provided with a fan-shaped atomizing nozzle via a pipeline.

[0024] In one embodiment, both the first and second liquid pumps are equipped with electrically controlled valves at their outlets.

[0025] In one embodiment, the left and right wheel sets of the mobile vehicle body are connected to the frame via a wheelbase adjustment mechanism. The wheelbase adjustment mechanism includes a rocker arm with its top surface hinged to the bottom surface of the mobile vehicle body. The left and right wheel sets are respectively mounted on both ends of the rocker arm. The end of the rocker arm is provided with a sliding hole. The left and / or right wheel sets are slidably inserted into the sliding hole via a plug rod. The wall of the sliding hole is provided with a insertion hole. The side of the plug rod is provided with multiple positioning holes. A locking pin passes through the insertion hole and is inserted into one of the positioning holes. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure;

[0027] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle;

[0028] Figure 3 This is a schematic diagram used to illustrate the structure of the Y-axis linear slide bar, the X-axis linear slide bar, and the Z-axis linear slide bar.

[0029] Figure 4 This is a schematic diagram used to illustrate the internal structure of the fertilizer container;

[0030] Figure 5 This is a schematic diagram used to illustrate the structure of the fertilizer injection needle;

[0031] Figure 6 This is a schematic diagram used to illustrate the structure of the wheel track adjustment mechanism.

[0032] 100. Mobile vehicle body; 110. Fertilizer tank; 111. Main fertilizer tank; 112. Secondary fertilizer tank; 113. Agitator blades; 114. Miniature motor; 120. Controller; 130. Ultrasonic sensor; 140. Optical tracking sensor; 150. Color camera; 160. Infrared ranging sensor; 171. First liquid pump; 172. Second liquid pump; 1721. Fan-shaped atomizing nozzle; 173. Fertilizer injection needle; 1731. Fertilizer outlet. ; 1732, Miniature auger drill bit; 1733, High-frequency miniature vibrator; 174, Electrically controlled valve; 180, Rocker arm; 181, Sliding hole; 182, Insertion hole; 183, Locking pin; 190, Insert rod; 191, Positioning hole; 200, Fertilizer application actuator; 210, Y-axis linear slide bar; 211, Y-axis slider; 220, X-axis linear slide bar; 221, X-axis slider; 230, Z-axis linear slide bar; 231, Z-axis slider. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0034] like Figure 1 and Figure 2 As shown, a liquid fertilizer application device is provided, which includes: a mobile vehicle 100, a fertilizer tank 110 and a liquid pump installed on the mobile vehicle 100, and a controller 120, wherein the inlet of the liquid pump is connected to the outlet of the fertilizer tank 110.

[0035] An ultrasonic sensor 130 is disposed at the front end of the mobile vehicle body 100. The detection direction of the ultrasonic sensor 130 is facing the side front. It is used to detect the distance between the mobile vehicle body 100 and the trunks of the rubber trees on both sides and transmit the signal to the controller 120.

[0036] An optical tracking sensor 140 is disposed at the bottom of the mobile vehicle body 100. The detection direction of the optical tracking sensor 140 is perpendicular to the ground. It is used to identify the ground path features between the rubber tree rows and transmit the signal to the controller 120.

[0037] A color camera 150 and an infrared ranging sensor 160 are provided. The color camera 150 is used to acquire image information of crops in front, and the infrared ranging sensor 160 is used to measure the vertical distance to the target point and transmit the information to the controller 120.

[0038] A fertilizer application execution component 200 is mounted on the mobile vehicle body 100, and the fertilizer application execution component 200 is connected to the outlet of the liquid pump through a pipeline;

[0039] The controller 120 receives signals from the ultrasonic sensor 130, the optical tracking sensor 140, the color camera 150, and the infrared ranging sensor 160, and controls the movement of the mobile vehicle 100 and the orientation of the fertilization end of the fertilization execution component 200.

[0040] In this embodiment, when traveling through the rubber plantation, the ultrasonic sensor 130 continuously detects the distance to the tree trunks on both sides and sends the data to the controller 120. The controller 120 calculates the vehicle's centerline based on this data. If it deviates from the centerline, it generates instructions to adjust the wheel steering, ensuring the vehicle always travels safely along the centerline between the rubber tree rows and avoiding collisions. The optical tracking sensor 140 simultaneously identifies path features on the ground, such as furrows or grass strips. It provides auxiliary navigation signals, which are fused with the ultrasonic data to further enhance navigation reliability. When the vehicle approaches the target crop, the color camera 150 captures an image ahead and identifies the crop type and the base of the crop stem using an image recognition algorithm. The infrared ranging sensor 160 simultaneously measures the precise distance between the sensor and the ground at the base of the crop roots. The controller 120 integrates visual and distance information to calculate the three-dimensional coordinates of the fertilization point, and then controls the fertilization end of the fertilization execution component 200 to move and align with the coordinate point. Simultaneously, it controls the fertilization execution component 200 to begin fertilization.

[0041] By combining multiple sensors and controllers (120), the system avoids the traditional reliance on human judgment and manual operation, achieving autonomous navigation, obstacle avoidance, and automated point-finding. Furthermore, through visual recognition and infrared ranging, it precisely locates the fertilization point, ensuring accurate application of fertilizer near the crop roots and significantly improving fertilizer efficiency. The multi-sensor combination overcomes the challenges of complex lighting conditions, guaranteeing the system's stability and reliability under various rubber plantation environments.

[0042] like Figure 2 and Figure 3 As shown, in one embodiment, the fertilization execution component 200 includes:

[0043] Y-axis linear slide bar 210, the Y-axis linear slide bar 210 is mounted on the bracket of the mobile vehicle body 100, and a Y-axis slider 211 is slidably mounted on the Y-axis linear slide bar 210. The movement direction of the Y-axis slider 211 is parallel to the travel direction of the mobile vehicle body 100.

[0044] X-axis linear slide bar 220, the X-axis linear slide bar 220 is disposed on the Y-axis slider 211, the X-axis slider 221 is slidably disposed on the X-axis linear slide bar 220, and the movement direction of the X-axis slider 221 is perpendicular to the travel direction of the moving vehicle body 100;

[0045] Z-axis linear slide bar 230, the Z-axis linear slide bar 230 is disposed on the X-axis slider 221, the Z-axis slider 231 is slidably disposed on the Z-axis linear slide bar 230, and the movement direction of the Z-axis slider 231 is perpendicular to the ground;

[0046] The fertilization end of the fertilization execution component 200 is located on the Z-axis slider 231.

[0047] In this embodiment, the Y-axis slider 211, X-axis slider 221, and Z-axis slider 231 are respectively sleeved on the Y-axis linear slide bar 210, X-axis linear slide bar 220, and Z-axis linear slide bar 230. Each of the Y-axis linear slide bar 210, X-axis linear slide bar 220, and Z-axis linear slide bar 230 is equipped with a drive motor, and a screw is mounted on the output shaft of the drive motor. The bottom ends of the Y-axis slider 211, X-axis slider 221, and Z-axis slider 231 have threaded holes, and the screw threads pass through these holes. Multiple drive motors drive the Y-axis slider 211, X-axis slider 221, and Z-axis slider 231 to slide along the Y-axis linear slide bar 210, X-axis linear slide bar 220, and Z-axis linear slide bar 230 respectively via the screws. The color camera 150 and the infrared ranging sensor 160 are both mounted on the Z-axis slider 231.

[0048] The controller 120 drives the drive motors on the three linear slide bars according to the calculated three-dimensional coordinates of the fertilization point, thereby moving the Y-axis slider 211, X-axis slider 221 and Z-axis slider 231 in sequence, so as to quickly and accurately move the fertilization end fixed on the Z-axis slider 231 to any target point in three-dimensional space.

[0049] like Figure 1 and Figure 2 As shown, in one embodiment, the fertilizer tank 110 includes a main fertilizer tank 111 and a secondary fertilizer tank 112, and the main fertilizer tank 111 and the secondary fertilizer tank 112 are respectively filled with liquid fertilizers for different crops;

[0050] The liquid pumps include a first liquid pump 171 and a second liquid pump 172. The inlet of the first liquid pump 171 is connected to the main fertilizer tank 111 through a pipeline, and the inlet of the second liquid pump 172 is connected to the auxiliary fertilizer tank 112 through a pipeline. The first liquid pump 171 and the second liquid pump 172 are controlled by the controller 120.

[0051] In this embodiment, the controller 120 can determine the fertilization plan based on the crop type identified by the color camera 150. When the controller 120 identifies the crop as a chili pepper, it activates the first liquid pump 171 to extract fertilizer suitable for chili peppers from the main fertilizer tank 111. When the controller 120 identifies the crop as a banana, it activates the second liquid pump 172 to extract fertilizer suitable for bananas from the secondary fertilizer tank 112. This achieves precise fertilization for different crops. One set of equipment can meet the fertilizer needs of multiple crops intercropped under forest cover, enhancing the equipment's versatility and economy, and avoiding the hassle of purchasing multiple dedicated devices or frequently changing fertilizers.

[0052] like Figure 4 As shown, in one embodiment, both the main fertilizer box 111 and the auxiliary fertilizer box 112 are equipped with stirring blades 113, and the stirring blades 113 are connected to the output shaft of a micro motor 114 located outside the box via a rotating shaft.

[0053] In this embodiment, before, during, or after fertilization, the controller 120 activates the micro motor 114 to slowly rotate the stirring blades 113, agitating the liquid fertilizer in the fertilizer tank 110. This prevents the solid components in the liquid fertilizer from settling and clumping, ensuring a consistent fertilizer concentration each time it is pumped out, thereby guaranteeing consistent fertilization results.

[0054] like Figure 5 As shown, in one embodiment, the outlet of the first liquid pump 171 is provided with a fertilizer injection needle 173 through a connecting pipe, and the side wall of the fertilizer injection needle 173 has a plurality of fertilizer outlet holes 1731.

[0055] In this embodiment, the fertilizer injection needle 173 is used to inject fertilizer into the soil. The fertilizer injection needle 173 has a hollow needle-like structure. When performing deep fertilization, the liquid pump pumps fertilizer into the fertilizer injection needle 173, and the fertilizer flows out from the fertilizer outlet hole 1731 on the side wall, seeping into the surrounding soil. The design of the fertilizer outlet hole 1731 on the side wall allows the fertilizer to diffuse more evenly in multiple directions in the soil, avoiding root burn caused by single-point liquid discharge. This directly delivers fertilizer to the deep soil layer where crop roots are dense, reducing fertilizer volatilization and surface runoff, and improving utilization efficiency.

[0056] like Figure 5 As shown, in one embodiment, the end of the fertilizer injection needle 173 is provided with a micro spiral drill bit 1732.

[0057] In this embodiment, before fertilization, the controller 120 controls the micro-auger drill bit 1732 to rotate and press down, drilling a guide hole in hard or compacted soil. Subsequently, the fertilization needle 173 descends along the guide hole to a predetermined depth to inject fertilizer. This ensures that the fertilization needle 173 can easily and accurately reach the predetermined deep fertilization depth, guaranteeing the deep fertilization effect.

[0058] like Figure 5As shown, in one embodiment, a high-frequency micro vibrator 1733 is provided on the tube wall of the fertilizer injection needle 173, and the wires of the high-frequency micro vibrator 1733 are electrically connected to the controller 120.

[0059] In this embodiment, during the fertilization process, the controller 120 activates the high-frequency micro-vibrator 1733, causing it to generate high-frequency, low-amplitude mechanical vibrations. This vibration effectively prevents viscous fertilizer from adhering to and clogging the fertilizer outlet 1731, ensuring a continuous and smooth fertilization process. It also helps the fertilizer solution diffuse more quickly into the surrounding soil after leaving the outlet 1731.

[0060] like Figure 1 and Figure 2 As shown, in one embodiment, the outlet of the second liquid pump 172 is provided with a fan-shaped atomizing nozzle 1721 via a pipeline.

[0061] In this embodiment, when surface fertilization or foliar fertilization is required, the controller 120 activates the second liquid pump 172, and the fertilizer is sprayed out in a fan-shaped mist through the atomizing nozzle, covering the soil surface or leaves around the crop. This is suitable for shallow-rooted crops that require large-area moist fertilization or for foliar fertilization. The fan-shaped atomizing nozzle 1721 can provide a wide and uniform fertilizer solution coverage, which is more effective than a direct current nozzle.

[0062] like Figure 1 As shown, in one embodiment, both the first liquid pump 171 and the second liquid pump 172 are provided with an electrically controlled valve 174 at their outlet ends.

[0063] In this embodiment, the controller 120 precisely controls the start / stop and flow rate of fertilizer application by controlling the opening / closing or the opening degree of the electronically controlled valve 174. This facilitates precise control of the amount of fertilizer applied in a single application and is a key component for adjusting the amount of fertilizer according to crop needs and ensuring consistent fertilization. The electronically controlled valve 174 has a fast opening and closing speed, enabling rapid response to the controller 120's commands and achieving precise switching of fertilizer application.

[0064] like Figure 6 As shown, in one embodiment, the left and right wheel sets of the mobile vehicle body 100 are connected to the frame via a wheelbase adjustment mechanism. The wheelbase adjustment mechanism includes a rocker arm 180 whose top surface is hinged to the bottom surface of the mobile vehicle body 100. The left and right wheel sets are respectively installed at both ends of the rocker arm 180. A sliding hole 181 is provided at the end of the rocker arm 180. The left wheel set and / or the right wheel set are slidably inserted into the sliding hole 181 via a plug rod 190. A insertion hole 182 is provided on the wall of the sliding hole 181. A plurality of positioning holes 191 are provided on the side of the plug rod 190. A locking pin 183 passes through the insertion hole 182 and is inserted into one of the positioning holes 191.

[0065] In this embodiment, the top surface of the rocker arm 180 is hinged to the bottom surface of the mobile vehicle body 100, and the rocker arm 180 is arranged along the width direction of the mobile vehicle body 100. Sliding holes 181 are provided at both ends of the rocker arm 180 along its length. Insert rods 190 are installed on the left and / or right wheel sets, and the insert rods 190 are slidably inserted into the sliding holes 181. When it is necessary to adapt to different rubber plantation row spacings, the locking pin 183 is pulled out, and the position of the insert rod 190 on the rocker arm 180 in the left and / or right wheel sets is manually slid to adjust to the required wheel spacing. After adjusting, the locking pin 183 is inserted into the new positioning hole 191 to fix it, and the distance between the left and right wheel sets is adjusted. This allows one device to adapt to different specifications of rubber plantation row spacings, greatly improving the versatility and application range of the equipment. Furthermore, relying on a purely mechanical structure, it is low-cost, not easily damaged, and its adjustment is intuitive and reliable, making it very suitable for the use environment of agricultural equipment.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A liquid fertilizer application device, comprising a mobile vehicle, a fertilizer tank and a liquid pump mounted on the mobile vehicle, and a controller, wherein the inlet of the liquid pump is connected to the outlet of the fertilizer tank, characterized in that: An ultrasonic sensor is installed at the front end of the mobile vehicle body, with the detection direction of the ultrasonic sensor facing the side front. It is used to detect the distance between the mobile vehicle body and the trunks of the rubber trees on both sides and transmit the signal to the controller. An optical tracking sensor is installed at the bottom of the mobile vehicle body. The detection direction of the optical tracking sensor is perpendicular to the ground. It is used to identify the ground path features between the rubber tree rows and transmit the signal to the controller. A color camera and an infrared ranging sensor are provided. The color camera is used to acquire image information of crops in front, and the infrared ranging sensor is used to measure the vertical distance to the target point and transmit the information to the controller. A fertilizer application execution component is mounted on the mobile vehicle body, and the fertilizer application execution component is connected to the outlet of the liquid pump via a pipeline; The controller receives signals from the ultrasonic sensor, the optical tracking sensor, the color camera, and the infrared ranging sensor, and controls the movement of the mobile vehicle and the orientation of the fertilization end of the fertilization execution component.

2. The liquid fertilizer application device according to claim 1, characterized in that, The fertilization execution component includes: A Y-axis linear slide bar is mounted on the support of the moving vehicle body. A Y-axis slider is slidably mounted on the Y-axis linear slide bar. The movement direction of the Y-axis slider is parallel to the travel direction of the moving vehicle body. An X-axis linear slide bar is mounted on the Y-axis slider, and an X-axis slider is slidably mounted on the X-axis linear slide bar. The movement direction of the X-axis slider is perpendicular to the travel direction of the moving vehicle. A Z-axis linear slider is mounted on the X-axis slider, and a Z-axis slider is slidably mounted on the Z-axis linear slider. The Z-axis slider moves in a direction perpendicular to the ground. The fertilization end of the fertilization execution component is located on the Z-axis slider.

3. The liquid fertilizer application device according to claim 1, characterized in that, The fertilizer tank includes a main fertilizer tank and a secondary fertilizer tank, and the main fertilizer tank and the secondary fertilizer tank are respectively filled with liquid fertilizers for different crops; The liquid pump includes a first liquid pump and a second liquid pump. The inlet of the first liquid pump is connected to the main fertilizer tank through a pipeline, and the inlet of the second liquid pump is connected to the auxiliary fertilizer tank through a pipeline. The first liquid pump and the second liquid pump are controlled by the controller.

4. The liquid fertilizer application device according to claim 3, characterized in that, Both the main fertilizer box and the auxiliary fertilizer box are equipped with stirring blades, which are connected to the output shaft of a micro motor located outside the box via a rotating shaft.

5. The liquid fertilizer application device according to claim 3, characterized in that, The outlet of the first liquid pump is equipped with a fertilizer injection needle through a connecting pipe, and the side wall of the fertilizer injection needle has several fertilizer outlet holes.

6. The liquid fertilizer application device according to claim 5, characterized in that, The fertilizer injection needle is equipped with a miniature auger bit at its end.

7. The liquid fertilizer application device according to claim 5, characterized in that, A high-frequency micro-vibrator is installed on the wall of the fertilizer injection needle, and the wires of the high-frequency micro-vibrator are electrically connected to the controller.

8. The liquid fertilizer application device according to claim 3, characterized in that, The outlet of the second liquid pump is equipped with a fan-shaped atomizing nozzle via a pipeline.

9. The liquid fertilizer application device according to claim 3, characterized in that, Both the first and second liquid pumps are equipped with electrically controlled valves at their outlet ends.

10. The liquid fertilizer application device according to any one of claims 1 to 9, characterized in that, The left and right wheel sets of the mobile vehicle body are connected to the frame via a wheelbase adjustment mechanism. The wheelbase adjustment mechanism includes a rocker arm with its top surface hinged to the bottom surface of the mobile vehicle body. The left and right wheel sets are respectively installed at both ends of the rocker arm. The end of the rocker arm is provided with a sliding hole. The left wheel set and / or the right wheel set are slidably inserted into the sliding hole via a plug rod. The wall of the sliding hole is provided with a insertion hole. The side of the plug rod is provided with multiple positioning holes. A locking pin passes through the insertion hole and is inserted into one of the positioning holes.

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