Fertilization device and system with automatic fertilizer shortage protection

Abstract

The present application discloses a fertilizing device and system with automatic fertilizer shortage protection, which specifically relates to the technical field of agricultural equipment. The scheme of the present application uses the above structure to send water into the mother liquid barrel through the first passage, mix it with the mother liquid in the mother liquid barrel under the action of the fertilizer pump, and pump the mixed mother liquid barrel out to complete the action of fertilizing. State 1, the water supply valve is closed, and the fertilizer pump is turned on, thereby completing the variable frequency flow regulation of the fertilizing device; state 2, the fertilizer dilution state, open the water supply valve, close the fertilizer pump or close the water supply valve, open the fertilizer pump, and under the control of the program, the time for diluting the fertilizer and fertilizing can be set at intervals to complete the dilution and fertilization of the fertilizer; state 3, cleaning equipment, close the water supply valve, reverse the fertilizer pump, so that the water flow in the first passage, the second passage, and the third passage is reversed, thereby completing the cleaning of the equipment. Therefore, the scheme of the present application has the advantages of simple scheme, uniform fertilization, and good stability.

Description

Technical Field

[0001] The present application relates to the technical field of agricultural equipment, and in particular to a fertilizing device and system with automatic fertilizer shortage protection. Background Art

[0002] In the prior art, agricultural irrigation mainly refers to the watering and irrigation of crops such as farmland or gardens in agricultural cultivation areas. The irrigation principle is that the irrigation amount, number of irrigations and time should be determined according to the water demand characteristics of the crops, climate, soil conditions, etc.; and the irrigation amount refers to the amount of water output from the output end of a single irrigation. In actual applications, due to the influence of factors such as climate and water demand characteristics, the irrigation amount will also be different. Therefore, the output water pressure needs to be adjusted each time irrigation is carried out so that the water output from the output end at a single time meets the actual water demand.

[0003] In the prior art, agricultural irrigation is no longer limited to irrigation water, but can also be used to irrigate pesticides and fertilizers. However, in the process of irrigating pesticides and fertilizers, the concentration of waste or pesticides will be controlled. In practical applications, the amount of water required is generally calculated first, and then the amount of corresponding pesticides or fertilizers is calculated. However, this will not only cause uneven stirring and incomplete dissolution of pesticides or fertilizers, which will lead to waste of pesticides or fertilizers, but also make the final output of the pesticide or fertilizer liquid concentration less accurate.

[0004] In order to solve the above problems, the present application proposes a fertilizing device and system with automatic fertilizer shortage protection to solve the above problems.

[0005] Application Contents

[0006] In a first aspect, an embodiment of the present application provides a fertilizing device with automatic fertilizer shortage protection, the fertilizing device comprising: a water supply valve, a one-way valve, a flow meter, a fertilizer pump, a liquid level gauge, a mother liquid barrel and a pipeline; the fertilizing device comprises a first passage, a second passage and a third passage, the two ends of the first passage are respectively connected to the first connection port of the second passage and the second connection port of the third passage, the water supply valve is arranged between the first connection port and the second connection port, one end of the second passage is connected to the third connection port of the third passage, and the other end of the second passage is connected to the mother liquid barrel, the one-way valve, the flow meter, and the fertilizer pump are arranged in sequence between the third connection port and the second connection port on the second passage, the liquid level gauge is arranged between the second connection port on the second passage and the mother liquid barrel, the end of the third passage close to the first connection port is the input end, and the end of the third passage close to the third connection port is the output end.

[0007] Optionally, the fertilization device further includes a second flow meter, which is disposed between the water supply valve of the first passage and the second connecting port and is used to monitor the water supply flow of the first passage.

[0008] Optionally, the fertilization device further comprises a pressure sensor, which is connected to a pipeline between the one-way valve and the flow meter on the second passage and is used to monitor the pressure of the second passage.

[0009] Optionally, the fertilization device further comprises a circulation passage, one end of which is connected to the second connecting port, and the other end of which is connected to the mother liquid barrel, and a pressure pump is provided on the circulation passage.

[0010] Optionally, a filtering device is provided between the liquid level meter and the mother liquid barrel on the second passage.

[0011] Optionally, the liquid level meter is any one of a 5G radar liquid level meter, a radar liquid level meter, a magnetic float liquid level meter, a capacitive liquid level meter, an ultrasonic liquid level meter, a servo liquid level meter, and a radio frequency admittance liquid level meter.

[0012] Optionally, the fertilizing device further comprises a stirring device, and the stirring device is arranged in the mother liquid barrel.

[0013] In a second aspect, the present application provides a fertilization system with automatic fertilizer deficiency protection, and the precision fertilization system comprises: a water pump, a first valve actuator, a second valve actuator, a third valve actuator and the fertilization device with automatic fertilizer deficiency protection; the water pump is arranged on the side of the first connecting port of the third passage of the fertilization device close to the input end, and the first valve actuator, the second valve actuator, and the third valve actuator are sequentially connected in parallel to the output end of the third passage, so that the liquid to be fertilized mixed by the fertilization device is sequentially transported to the first valve actuator, the second valve actuator, and the third valve actuator through the second passage and the third passage under the action of the fertilizer pump.

[0014] The fertilization device with automatic fertilizer shortage protection used in the embodiment of the present application comprises: a water supply valve, a one-way valve, a flow meter, a fertilizer pump, a liquid level gauge, a mother liquid barrel and a pipeline; the fertilization device comprises a first passage, a second passage and a third passage, the two ends of the first passage are respectively connected with the first connection port of the second passage and the second connection port of the third passage, the water supply valve is arranged between the first connection port and the second connection port, one end of the second passage is connected with the third connection port of the third passage, and the other end of the second passage is connected with the mother liquid barrel, the one-way valve, the flow meter and the fertilizer pump are arranged in sequence between the third connection port and the second connection port on the second passage, the liquid level gauge is arranged between the second connection port on the second passage and the mother liquid barrel, the end of the third passage close to the first connection port is the input end, and the end of the third passage close to the third connection port is the output end. The scheme of the present application uses the above structure to send water into the mother liquid barrel through the first passage, mix it with the mother liquid in the mother liquid barrel under the action of the fertilizer pump, and pump the mixed mother liquid barrel out to complete the action of fertilizing. In this process, it can be divided into three operating states: state 1, the water supply valve is closed, and the fertilizer pump is turned on, thereby completing the variable frequency flow regulation of the fertilization device; state 2, the fertilizer dilution state, open the water supply valve, close the fertilizer pump or close the water supply valve, open the fertilizer pump, and under the control of the program, the time for diluting the fertilizer and fertilizing can be set at intervals to complete the dilution and fertilization of the fertilizer; state 3, cleaning the equipment, close the water supply valve, reverse the operation of the fertilizer pump, so that the water flow in the first passage, the second passage, and the third passage is reversed, thereby completing the cleaning of the equipment. Therefore, the scheme of the present application has the advantages of simple scheme, uniform fertilization, and good stability.

[0015] Other optional features and technical effects of the embodiments of the present application are partially described below, and partially can be understood by reading this document. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Hereinafter, embodiments of the present application will be described in detail in conjunction with the accompanying drawings. The elements shown are not limited by the proportions shown in the accompanying drawings. The same or similar reference numerals in the accompanying drawings represent the same or similar elements, wherein:

[0017] Figure 1 A schematic diagram of a fertilizing device with automatic fertilizer shortage protection according to an embodiment of the present application is shown;

[0018] Figure 2 A schematic diagram of the structure of a Venturi pump of another fertilization device with automatic fertilizer shortage protection according to an embodiment of the present application is shown;

[0019] Figure 3 A schematic diagram of the structure of a Venturi pump of another fertilization device with automatic fertilizer shortage protection according to an embodiment of the present application is shown;

[0020] Figure 4 A schematic diagram of a fertilization system with automatic fertilizer deficiency protection according to an embodiment of the present application is shown.

[0021] Figure numerals: 11-water supply valve; 12-check valve; 13-flow meter; 14-fertilizer pump; 15-liquid level meter; 16-mother liquid barrel; 17-second flow meter; 18-pressure sensor; 20-water pump; 21-first valve actuator; 22-second valve actuator; 23-third valve actuator. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with specific implementation methods and drawings. Here, the illustrative implementation methods and descriptions of the present application are used to explain the present application, but are not intended to limit the present application.

[0023] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0024] Figure 1 A schematic diagram of a fertilizing device with automatic fertilizer shortage protection according to an embodiment of the present application is shown; Figure 1As shown, the embodiment of the present application provides a fertilizing device with automatic fertilizer shortage protection, the fertilizing device comprising: a water supply valve 11, a one-way valve 12, a flow meter 13, a fertilizer pump 14, a liquid level meter 15, a mother liquid barrel 16 and a pipeline; the fertilizing device comprises a first passage, a second passage and a third passage, the two ends of the first passage are respectively connected to the first connection port of the second passage and the second connection port of the third passage, the water supply valve 11 is arranged between the first connection port and the second connection port, one end of the second passage is connected to the third connection port of the third passage, and the other end of the second passage is connected to the mother liquid barrel 16, the one-way valve 12, the flow meter 13, and the fertilizer pump 14 are arranged in sequence between the third connection port and the second connection port on the second passage, the liquid level meter 15 is arranged between the second connection port on the second passage and the mother liquid barrel 16, the end of the third passage close to the first connection port is the input end, and the end of the third passage close to the third connection port is the output end. For further explanation, the liquid flow path of the fertilization device is described here. Specifically, when the fertilization device needs to be used, the water flowing in through the water supply valve 11 can be opened, and the fertilizer pump 14 can be opened, so that the water flowing in through the water supply valve 11 can flow into the mother liquid barrel 16, and the mother liquid in the mother liquid barrel 16 is sucked out by the fertilizer pump 14 and mixed with the water flow to be mixed, thereby completing the basic mixing of the fertilizer, and then output to the first passage through the flow meter 13 and the one-way valve 12 in turn, thereby completing the basic fertilization. In actual application, the fertilization device of the scheme of the present application includes three There are three states: state 1, the water supply valve 11 is closed, and the fertilizer pump 14 is turned on, so as to complete the variable frequency flow regulation of the fertilizing device; state 2, the fertilizer dilution state, the water supply valve 11 is opened, and the fertilizer pump 14 is closed, or the water supply valve 11 is closed and the fertilizer pump 14 is opened, and the time for diluting the fertilizer and fertilizing can be set at intervals under the control of the program to complete the dilution and fertilization of the fertilizer; state 3, cleaning the equipment, the water supply valve 11 is closed, and the fertilizer pump 14 is reversed to reverse the water flow in the first passage, the second passage, and the third passage, so as to complete the cleaning of the equipment.

[0025] Specifically, in state 1, the water supply valve 11 is closed, and the fertilizer pump 14 is turned on, that is, by mixing water with the mother liquor in the mother liquor barrel 16, the fertilizer mixing is preliminarily completed, and by changing the operating time of the fertilizer pump 14, variable frequency fertilization can be completed. That is, if the opening time of the fertilizer pump 14 is controlled to be one minute and the closing time is three minutes, then the fertilizing device in state 1 fertilizes for one minute and mixes the fertilizer for three minutes. If the fertilizing device is also provided with a stirring device, the state 1 of the fertilizing device is to fertilize for one minute and stir the mixed fertilizer for three minutes.

[0026] In practical applications, the mixed fertilizer and the time of fertilization are determined according to actual needs and are not specifically limited here.

[0027] State 2, fertilizer dilution state, open the water supply valve 11, close the fertilizer pump 14 or close the water supply valve 11 and open the fertilizer pump 14, and under the control of the program, the time for diluting the fertilizer and applying the fertilizer can be set at intervals to complete the dilution and fertilization of the fertilizer. This state can be divided into the water supply valve opening part and the water supply valve closing part, wherein the water supply valve opening part is to open the water supply valve, close the fertilizer pump 14, and turn on the stirring device, so as to stir and dilute the mother liquid in the mother liquid barrel 16; the water supply valve closing part is to monitor that the concentration of the mother liquid in the mother liquid barrel 16 reaches the preset threshold, which means that the concentration of the mother liquid barrel 16 reaches the fertilizer concentration, then close the water supply valve 11, open the fertilizer pump 14, and send the mother liquid in the mother liquid barrel 16 into the third passage to complete the fertilization.

[0028] In actual applications, the concentration of the mother liquid in the mother liquid barrel 16 reaches a preset threshold value, which is determined according to actual needs. According to the preset threshold value and the power of the fertilizer pump 14, the time for opening and closing the water supply valve part of state 2 can be controlled by controlling the working time of the fertilizer pump 14.

[0029] State 3, cleaning the equipment, closing the water supply valve 11, and operating the fertilizer pump 14 in reverse, so that the water flow in the first passage, the second passage, and the third passage is reversed, thereby completing the cleaning of the equipment.

[0030] In practical applications, the time for cleaning the equipment depends on the type of fertilizer, the time of fertilizer application and the power of the fertilizer pump 14, and is not specifically limited here.

[0031] Specifically, the alarm or threshold of the following states can be changed by setting the parameters of the fertilizer pump 14 and the flowmeter 13. By setting the parameters of the liquid level meter 15, it can be determined when the mother liquid barrel 16 is full, that is, the water supply of the water supply valve 11 is stopped when the barrel is full, that is, the fertilization device stops when the barrel is full; by calculating the amount of water supplied by the water supply valve 11 and the fertilizer absorption power of the fertilizer pump 14, the remaining fertilizer absorption concentration of the mother liquid barrel 16 can be calculated, so that when the fertilizer concentration in the mother liquid barrel 16 is insufficient or excessive, fertilization is stopped, and non-protection is completed; by monitoring the pressure in the second passage, if the pressure is insufficient or too high, the pressure in the second passage is changed, so as to protect the fertilization equipment; by monitoring the second flowmeter 17 and the flowmeter 13 respectively monitor the flow in the first passage and the second passage, it is calculated whether the flow of the equipment is insufficient. If the flow is insufficient, the flow can be adjusted by adjusting the switching amplitude of the water supply valve 11.

[0032] Figure 2 FIG. 2 shows a schematic structural diagram of a venturi pump of another fertilization device with automatic fertilizer shortage protection according to an embodiment of the present application; Figure 2As shown, optionally, the fertilization device further comprises a second flow meter 17, and the second flow meter 17 is arranged between the water supply valve 11 of the first passage and the second connecting port, and is used for monitoring the water supply flow of the first passage.

[0033] The second flow meter 17 is used to monitor the water flow rate of the first passage. If the flow rates in the first passage and the second passage are monitored by the second flow meter 17 and the flow meter 13 respectively, it is calculated whether the flow rate of the device is insufficient. If the flow rate is insufficient, the flow rate can be adjusted by adjusting the opening and closing amplitude of the water supply valve 11.

[0034] Figure 3 FIG. 2 shows a schematic structural diagram of a venturi pump of another fertilization device with automatic fertilizer shortage protection according to an embodiment of the present application; Figure 3 As shown, optionally, the fertilizing device further comprises a pressure sensor 18, and the pressure sensor 18 is connected to a pipeline between the one-way valve 12 and the flow meter 13 on the second passage, and is used for monitoring the pressure of the second passage.

[0035] The pressure sensor 18 is used to monitor the pressure in the second passage. By monitoring the pressure in the second passage, if the pressure is insufficient or too high, the pressure in the second passage is changed, thereby protecting the fertilizing equipment.

[0036] Optionally, the fertilizing device further comprises a circulation passage, one end of which is in communication with the second connecting port, and the other end of which is in communication with the mother liquid barrel 16, and a pressure pump is provided on the circulation passage.

[0037] Since the fertilizer contains more insoluble fertilizers or insoluble small granular fertilizers, a circulation passage is set on the fertilization device so that the mother liquid in the mother liquid barrel 16 can be circulated once through the circulation passage, thereby reducing the probability of the fertilizer containing more insoluble fertilizers or insoluble small granular fertilizers.

[0038] Optionally, a filter device is provided between the liquid level gauge 15 and the mother liquid barrel 16 on the second passage. Since there are many poorly soluble fertilizers or insoluble small granular fertilizers in the fertilizer, the type of the filter device can be a filter screen, a filter cotton, or other types of filter structures, which are not specifically limited here. The number of the filter devices can be one or more, and the specific number and type are set according to actual needs. It should be noted that the filter device is used to block undissolved fertilizers or pesticide residues, so that the dissolved fertilizers or pesticide residues can pass through unimpeded.

[0039] Optionally, the liquid level meter 15 is any one of a 5G radar liquid level meter 15, a radar liquid level meter 15, a magnetic float ball liquid level meter 15, a capacitive liquid level meter 15, an ultrasonic liquid level meter 15, a servo liquid level meter 15, and a radio frequency admittance liquid level meter 15.

[0040] Optionally, the fertilizing device further includes a stirring device, and the stirring device is disposed in the mother liquid barrel 16 .

[0041] The stirring device is arranged in the mother liquid barrel 16 to fully melt the mother liquid in a solid state. The type, quantity, size and other parameters of the stirring device are determined according to actual needs and are not specifically limited here.

[0042] Optionally, a water check valve is provided at the output end.

[0043] In order to prevent the sucked solution from returning to the fertilizing device, a water check valve is provided at the output end, and the water check valve is used to prevent water from returning to the fertilizing device.

[0044] The fertilization device with automatic fertilizer shortage protection used in the embodiment of the present application comprises: a water supply valve 11, a one-way valve 12, a flow meter 13, a fertilizer pump 14, a liquid level meter 15, a mother liquid barrel 16 and a pipeline; the fertilization device comprises a first passage, a second passage and a third passage, the two ends of the first passage are respectively connected to the first connection port of the second passage and the second connection port of the third passage, the water supply valve 11 is arranged between the first connection port and the second connection port, one end of the second passage is connected to the third connection port of the third passage, and the other end of the second passage is connected to the mother liquid barrel 16, the one-way valve 12, the flow meter 13, and the fertilizer pump 14 are arranged in sequence between the third connection port and the second connection port on the second passage, the liquid level meter 15 is arranged between the second connection port on the second passage and the mother liquid barrel 16, the end of the third passage close to the first connection port is the input end, and the end of the third passage close to the third connection port is the output end. The scheme of the present application uses the above structure to send water into the mother liquid barrel 16 through the first passage, mixes with the mother liquid in the mother liquid barrel 16 under the action of the fertilizer pump 14, and pumps out the mixed mother liquid barrel 16 to complete the action of fertilization. In this process, it can be divided into three operating states: state 1, the water supply valve 11 is closed, and the fertilizer pump 14 is opened, so as to complete the variable frequency flow regulation of the fertilization device; state 2, the fertilizer dilution state, open the water supply valve 11, close the fertilizer pump 14 or close the water supply valve 11, open the fertilizer pump 14, and under the control of the program, the time for diluting the fertilizer and fertilizing can be set at intervals to complete the dilution and fertilization of the fertilizer; state 3, cleaning equipment, close the water supply valve 11, reverse the operation of the fertilizer pump 14, so that the water flow in the first passage, the second passage, and the third passage is reversed, thereby completing the cleaning of the equipment. Therefore, the scheme of the present application has the advantages of simple scheme, uniform fertilization, and good stability.

[0045] Figure 4 FIG. 2 shows a schematic diagram of a fertilization system with automatic fertilizer shortage protection according to an embodiment of the present application. Figure 4 As shown, an automatic fertilizer shortage protection fertilization system of an embodiment of the present application, the precision fertilization system comprises: a water pump 20, a first valve actuator 21, a second valve actuator 22, a third valve actuator 23 and an automatic fertilizer shortage protection fertilization device as described in any one of the above; the water pump 20 is arranged on the side of the first connecting port of the third passage of the fertilization device close to the input end, and the first valve actuator 21, the second valve actuator 22, and the third valve actuator 23 are sequentially connected in parallel to the output end of the third passage, so that the liquid to be fertilized mixed by the fertilization device is sequentially transported to the first valve actuator 21, the second valve actuator 22, and the third valve actuator 23 through the second passage and the third passage under the action of the fertilizer pump 14.

[0046] In the main pipeline, the solution enters the fertilization device through the input end of the fertilization device, and the pesticide or fertilizer is mixed by the fertilization device. The mixed solution containing the pesticide or fertilizer is output to the output end of the third passage through the output end of the fertilization device. At the output end of the third passage, the mixed pesticide or fertilizer solution reaches the first valve actuator 21, the second valve actuator 22, and the third valve actuator 23. The first valve actuator 21, the second valve actuator 22, and the third valve actuator 23 are arranged in the farmland that needs to be fertilized or irrigated. When the farmland needs to be irrigated, the valve actuator corresponding to the farmland is controlled to open the valve actuator to release the mixed pesticide or fertilizer solution to complete the irrigation of the farmland.

[0047] It should be noted that the number and type of the valve actuator are set according to actual needs and are not specifically limited here. As long as the valve actuator is set in the farmland, when the farmland needs to be irrigated, the irrigation can be completed by opening the corresponding valve actuator.

[0048] The systems, devices, modules or units described in the above embodiments may be implemented by computers or their associated components.

[0049] The methods, programs, systems, devices, etc. of the embodiments of the present application may be executed or implemented in a single or multiple networked computers, or may be practiced in a distributed computing environment. In the embodiments of the present specification, in these distributed computing environments, tasks may be performed by remote processing devices connected via a communication network.

[0050] Those skilled in the art should understand that the embodiments of the present specification can be provided as methods, systems or computer program products. Therefore, those skilled in the art can imagine that the implementation of the functional modules / units or controllers and related method steps described in the above embodiments can be implemented in software, hardware or a combination of software / hardware.

[0051] Unless explicitly stated, the actions or steps of the methods, programs, and embodiments of the present application do not have to be performed in a specific order and can still achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0052] In this article, multiple embodiments of the present application are described, but for the sake of simplicity, the description of each embodiment is not exhaustive, and the same or similar features or parts between the various embodiments may be omitted. In this article, "one embodiment", "some embodiments", "example", "specific example", or "some examples" are intended to be applicable to at least one embodiment or example according to the present application, rather than all embodiments. The above terms do not necessarily mean to refer to the same embodiment or example. In the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0053] The exemplary systems and methods of the present application have been specifically shown and described with reference to the above embodiments, which are merely examples of the best modes for implementing the present systems and methods. It will be appreciated by those skilled in the art that various changes may be made to the embodiments of the systems and methods described herein when implementing the present systems and / or methods without departing from the spirit and scope of the present application as defined in the appended claims.

Claims

1. A fertilizing device with automatic fertilizer shortage protection, characterized in that: The fertilization device includes: a water supply valve, a one-way valve, a flow meter, a fertilizer pump, a liquid level meter, a mother liquid barrel and a pipeline; the fertilization device includes a first passage, a second passage and a third passage, the two ends of the first passage are respectively connected to the first connection port of the second passage and the second connection port of the third passage, the water supply valve is arranged between the first connection port and the second connection port, one end of the second passage is connected to the third connection port of the third passage, and the other end of the second passage is connected to the mother liquid barrel, the one-way valve, the flow meter, and the fertilizer pump are arranged in sequence between the third connection port and the second connection port on the second passage, the liquid level meter is arranged between the second connection port on the second passage and the mother liquid barrel, the end of the third passage close to the first connection port is the input end, and the end of the third passage close to the third connection port is the output end.

2. The fertilizing device with automatic fertilizer shortage protection according to claim 1, characterized in that: The fertilizing device further includes a second flow meter, which is disposed between the water supply valve of the first passage and the second connecting port and is used to monitor the water supply flow of the first passage.

3. The fertilizing device with automatic fertilizer shortage protection according to claim 2 is characterized in that: The fertilizing device further comprises a pressure sensor, which is connected to a pipeline between the one-way valve and the flow meter on the second passage and is used for monitoring the pressure of the second passage.

4. The fertilizing device with automatic fertilizer shortage protection according to claim 3 is characterized in that: The fertilizing device further comprises a circulation passage, one end of which is communicated with the second connecting port, and the other end of which is communicated with the mother liquid barrel, and a pressure pump is arranged on the circulation passage.

5. The fertilizing device with automatic fertilizer shortage protection according to claim 4 is characterized in that: A filtering device is provided between the liquid level meter and the mother liquid barrel on the second passage.

6. The fertilizing device with automatic fertilizer shortage protection according to claim 5, characterized in that: The liquid level meter is any one of a 5G radar liquid level meter, a radar liquid level meter, a magnetic float liquid level meter, a capacitive liquid level meter, an ultrasonic liquid level meter, a servo liquid level meter, and a radio frequency admittance liquid level meter.

7. The fertilizing device with automatic fertilizer shortage protection according to claim 1, characterized in that: The fertilizing device also includes a stirring device, and the stirring device is arranged in the mother liquid barrel.

8. A fertilization system with automatic fertilizer deficiency protection, characterized in that: The fertilization system comprises: a water pump, a first valve actuator, a second valve actuator, a third valve actuator and a fertilization device with automatic fertilizer deficiency protection as described in any one of claims 1 to 7; the water pump is arranged on the side of the first connecting port of the third passage of the fertilization device close to the input end, and the first valve actuator, the second valve actuator and the third valve actuator are sequentially connected in parallel to the output end of the third passage, so that the liquid to be fertilized mixed by the fertilization device is sequentially transported to the first valve actuator, the second valve actuator and the third valve actuator through the second passage and the third passage under the action of the fertilizer pump.

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