A method of conditioning the electrical conductivity of a fertilizer and a mobile irrigation header

Abstract

The application provides a method for adjusting the conductivity of fertilizer and a mobile irrigation head applied to the field of agriculture. Since the jurisdiction of the fixed head is limited, the mobile irrigation head is more applied to agricultural production. The mobile irrigation head provided by the application can automatically adjust the conductivity of the fertilizer. Under the premise of ensuring the fertilization effect, the conductivity of the fertilizer is not too high, the problem of seedling burning is avoided, and the adjustment process is automatic, so that the agricultural producers do not need to operate, and the development of intelligent agriculture is promoted.

Description

Technical Field

[0001] This application relates to the field of agricultural technology, and more specifically, to a method for regulating the electrical conductivity of fertilizers and a mobile irrigation head. Background Technology

[0002] Fixed pumping stations are typically designed for use with field wells, irrigation canals, and other similar structures. They form the core of the field irrigation system for water supply and fertilization. However, their coverage area is limited, usually less than 500 mu (approximately 33 hectares), and rarely exceeding 1000 mu (approximately 67 hectares). The main reasons for this limited coverage are threefold: 1. Insufficient groundwater or water supply systems make it difficult to meet the irrigation needs of large areas; 2. Large areas require high-performance pumps with high power and large pipe diameters, resulting in high initial and maintenance costs; 3. Large areas lead to complex field pipeline networks, with pressure loss increasing with distance from the pumping station, making it difficult to maintain pressure and flow balance across irrigation areas. Therefore, more and more agricultural producers are choosing mobile pumping stations. However, current mobile pumping stations have relatively limited functionality, especially during fertilization, where the electrical conductivity (EC) of the fertilizer needs to be manually adjusted, which is time-consuming and labor-intensive. Therefore, achieving automatic EC adjustment has become a pressing technical problem. Summary of the Invention

[0003] This application provides a method for adjusting the electrical conductivity of fertilizer and a mobile irrigation head that can automatically adjust the electrical conductivity of fertilizer. While ensuring the fertilization effect, the electrical conductivity of fertilizer will not be too high, avoiding the problem of burning seedlings. Moreover, the adjustment process is automatic and does not require operation by agricultural producers, which helps to promote the development of smart agriculture.

[0004] In a first aspect, a method for adjusting the electrical conductivity of fertilizer is provided, the method being applied to a mobile irrigation head, the method comprising: responding to a first command to activate a pump (1428) and a fertilizer inlet valve (1427) in a first operating condition, wherein the first command is used to instruct the initiation of fertilization, the pump (1428) is used for fertilizer suction, the fertilizer inlet valve (1427) is a ball valve, the frequency of the pump (1428) corresponding to the first operating condition is full frequency, and the electrical conductivity of the fertilizer inlet valve (1427) is... The opening degree is the minimum opening degree; when the conductivity of the fertilizer is detected to be greater than the target value, the frequency of the pump (1428) is reduced so that the difference between the conductivity and the target value is less than or equal to the first threshold; or when the conductivity is detected to be less than the target value, the opening degree of the fertilizer suction port valve (1427) is first increased so that the conductivity is greater than the target value, and after the conductivity is greater than the target value, the frequency of the pump (1428) is reduced so that the difference between the conductivity and the target value is less than or equal to the first threshold.

[0005] In this embodiment, after the mobile irrigation head receives the first instruction, it can start the pump at full frequency and open the fertilizer inlet valve at minimum opening. When the conductivity of the fertilizer is detected to be greater than the target value, the conductivity can be reduced by decreasing the pump frequency. When the conductivity of the fertilizer is detected to be less than the target value, the opening of the fertilizer inlet valve can be increased first to make the conductivity of the fertilizer greater than the target value, and then the conductivity can be reduced by decreasing the pump frequency, so that the difference between the conductivity and the target value is less than or equal to a first threshold.

[0006] In conjunction with the first aspect, in some implementations of the first aspect, after reducing the frequency of the pump (1428), or after first increasing the opening of the fertilizer inlet valve (1427) and then reducing the frequency of the pump (1428), the method further includes: when the conductivity is detected to be greater than the target value, reducing the frequency of the pump (1428), or reducing the opening of the fertilizer inlet valve (1427), or first reducing the opening of the fertilizer inlet valve (1427), and when the conductivity is less than the target value... Then, the frequency of the pump (1428) is increased so that the difference between the conductivity and the target value is less than or equal to the first threshold. When the conductivity is detected to be less than the target value, the frequency of the pump (1428) is increased, or the opening of the fertilizer inlet valve (1427) is increased, or the opening of the fertilizer inlet valve (1427) is increased first, and after the conductivity is greater than the target value, the frequency of the pump (1428) is decreased so that the difference between the conductivity and the target value is less than or equal to the first threshold.

[0007] In conjunction with the first aspect, in certain implementations of the first aspect, when the conductivity is detected to be greater than the target value, the frequency of the pump (1428) is reduced, or the opening of the fertilizer inlet valve (1427) is reduced, or the opening of the fertilizer inlet valve (1427) is reduced first, and the frequency of the pump (1428) is increased after the conductivity is less than the target value, including: when the ratio of the conductivity to the target value is greater than a second threshold, the opening of the fertilizer inlet valve (1427) is reduced, or the opening of the fertilizer inlet valve (1427) is reduced first, and the frequency of the pump (1428) is increased after the conductivity is less than the target value; or when the ratio of the conductivity to the target value is less than or equal to the second threshold, the frequency of the pump (1428) is reduced.

[0008] In conjunction with the first aspect, in certain implementations of the first aspect, when the conductivity is detected to be less than the target value, the frequency of the pump (1428) is increased, or the opening of the fertilizer inlet valve (1427) is increased, or the opening of the fertilizer inlet valve (1427) is increased first, and the frequency of the pump (1428) is decreased after the conductivity is greater than the target value, including: when the ratio of the conductivity to the target value is less than a third threshold, the opening of the fertilizer inlet valve (1427) is increased, or the opening of the fertilizer inlet valve (1427) is increased first, and the frequency of the pump (1428) is decreased after the conductivity is greater than the target value; or when the ratio of the conductivity to the target value is greater than or equal to the third threshold, the frequency of the pump (1428) is increased.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the adjustment step of the fertilizer inlet valve (1427) and the pump (1428) is determined based on the ratio of the conductivity to the target value.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, when the conductivity of the fertilizer is detected to be greater than the target value, the frequency of the pump (1428) is reduced, including: when the conductivity is detected to be greater than the target value, determining the reduction step of the pump (1428); and reducing the frequency of the pump (1428) according to the reduction step.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, determining the reduction step of the pump (1428) includes: determining the ratio of the conductivity to the target value; and determining the reduction step of the pump (1428) based on the ratio of the conductivity to the target value.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, when the conductivity is detected to be less than the target value, the opening of the fertilizer inlet valve (1427) is first increased to make the conductivity greater than the target value, and after the conductivity is greater than the target value, the frequency of the pump (1428) is then reduced, including: when the conductivity is detected to be less than the target value, determining the increment of the fertilizer inlet valve (1427), and after the conductivity is greater than the target value, determining the decrement of the pump (1428); increasing the opening of the fertilizer inlet valve (1427) according to the increment of the fertilizer inlet valve (1427), and after the conductivity is greater than the target value, reducing the decrement of the pump (1428) according to the decrement of the pump (1428).

[0013] In conjunction with the first aspect, in some implementations of the first aspect, determining the increasing step of the fertilizer inlet valve (1427) and the decreasing step of the pump (1428) after the conductivity is greater than the target value includes: determining the increasing step of the fertilizer inlet valve (1427) and the decreasing step of the pump (1428) based on the ratio of the conductivity to the target value.

[0014] Secondly, a mobile irrigation head is provided, comprising a mobile compartment (110), an irrigation pipeline system (120), a fertilizer system (130), and a fertilizer and irrigation control system (140). The mobile compartment (110) is provided with an inlet (111) and an outlet (112). The inlet (111) is connected to a water source, in which a water pump is installed. The outlet (111) is connected to an irrigation channel in the farmland. The irrigation pipeline system (120) is housed within the mobile compartment (110) and includes an inlet pipe (121) and an outlet pipe (122). The inlet pipe (121) is connected to the inlet (111), and the outlet pipe... (122) Connected to the outlet (112), the fertilizer system (130) is housed in the mobile container (110). The fertilizer system (130) includes a fertilizer tank (131) and a water injection pipe (132). The water injection pipe (132) is connected to the outlet pipe (122) in the irrigation pipeline system (120) for injecting water into the fertilizer tank (131). The fertilization and irrigation control system (140) is housed in the mobile container (110) and includes a control module (141) and a pipe assembly (142). The pipe assembly (142) is connected to the irrigation pipeline system (120) and the fertilizer system (130). The pipe assembly (142) includes: an inlet assembly (1401) and an outlet assembly. The system comprises a fertilizer system (120), a fertilizer suction assembly (1402), a fertilizer mixing assembly (1403), and a fertilizer mixing assembly (1404). The water inlet assembly (1401) and the water outlet assembly (1402) are connected to the irrigation pipeline system (120). The water inlet assembly (1401) includes an inlet sub-pipe (1424), and the water outlet assembly (1402) includes an outlet sub-pipe (1425). The inlet sub-pipe (1424) and the outlet sub-pipe (1425) are connected to the outlet pipe (122) of the irrigation pipeline system (1220). The fertilizer suction assembly (1403) is connected to the fertilizer system (130). The fertilizer suction assembly (1403) includes a fertilizer suction sub-pipe (1426) and a fertilizer suction port valve (1427). The fertilizer mixing assembly (1404)... 1404) includes: a pump (1428), a first fertilizer mixing pipe (1429) and a second fertilizer mixing pipe (1430), the fertilizer mixing assembly (1404) is provided with a conductivity detector (1433), one end of the first fertilizer mixing pipe (1429) is connected to the water inlet sub-pipe (1424) and the fertilizer suction sub-pipe (1426), the other end of the first fertilizer mixing pipe (1429) is connected to the pump (1428), one end of the second fertilizer mixing pipe (1430) is connected to the pump (1428), the other end of the second fertilizer mixing pipe (1430) is connected to the water outlet sub-pipe (1425), and the control module (141) is used to execute the first aspect and any possible implementation of the first aspect.

[0015] Thirdly, a mobile irrigation head is provided, comprising a mobile compartment (110), an irrigation pipeline system (120), a fertilizer system (130), and a fertilizer and irrigation control system (140). The irrigation pipeline system (120), the fertilizer system (130), and the fertilizer and irrigation control system (140) are housed in the mobile compartment (110). The fertilizer and irrigation control system (140) includes a control module (141) and a pipeline assembly (142). The component (142) is connected to the irrigation pipeline system (120) and the fertilizer system (130) for water and fertilizer mixing. The pipeline component (142) includes a fertilizer inlet valve (1427) and a pump (1428) for controlling the flow rate of fertilizer. The pipeline component (142) is equipped with a conductivity detector (1433). The control module (141) is used to perform the first aspect and any possible implementation of the first aspect. Attached Figure Description

[0016] Figure 1 This is a schematic structural block diagram of a movable irrigation head provided in an embodiment of this application.

[0017] Figure 2 This is a schematic side view of a mobile warehouse provided in an embodiment of this application.

[0018] Figure 3 This is a schematic three-dimensional structural diagram of an irrigation head provided in an embodiment of this application.

[0019] Figure 4 This is another schematic three-dimensional structural diagram of the irrigation head provided in the embodiments of this application.

[0020] Figure 5 This is a schematic perspective view of a pipeline component in the fertilization and irrigation control system provided in the embodiments of this application.

[0021] Figure 6 yes Figure 5 A magnified view of part A in the diagram.

[0022] Figure 7 This is a schematic flowchart illustrating the method for adjusting the electrical conductivity of fertilizer provided in the embodiments of this application. Detailed Implementation

[0023] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0024] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, “at least one” and “one or more” refer to one, two, or more than two. The term “and / or” is used to describe the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can indicate: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship.

[0025] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0026] Fixed pumping stations are typically designed for use with field wells, irrigation canals, and other similar structures. They form the core of the field irrigation system for water supply and fertilization. However, their coverage area is limited, usually less than 500 mu (approximately 33 hectares), and rarely exceeding 1000 mu (approximately 67 hectares). The main reasons for this limited coverage are threefold: 1. Insufficient groundwater or water supply systems make it difficult to meet the irrigation needs of large areas; 2. Large areas require high-performance pumps with high power and large pipe diameters, resulting in high initial and maintenance costs; 3. Large areas lead to complex field pipeline networks, with pressure loss increasing with distance from the pumping station, making it difficult to maintain pressure and flow balance across irrigation areas. Therefore, more and more agricultural producers are choosing mobile pumping stations. However, current mobile pumping stations have relatively limited functionality, especially during fertilization, where the electrical conductivity (EC) of the fertilizer needs to be manually adjusted, which is time-consuming and labor-intensive. Therefore, achieving automatic EC adjustment has become a pressing technical problem.

[0027] The following text will first combine Figures 1-6This application describes a mobile irrigation head provided in an embodiment.

[0028] Figure 1 A schematic structural diagram of a movable irrigation head provided in an embodiment of this application is shown.

[0029] like Figure 1 As shown, the mobile irrigation head 100 includes: a mobile compartment 110, an irrigation pipeline system 120, a fertilizer system 130, and a fertilizer and irrigation control system 140.

[0030] The mobile container 110 is equipped with a water inlet and a water outlet. The water inlet is connected to a water source, which contains a water pump, and the water outlet is connected to an irrigation channel in the farmland.

[0031] The irrigation piping system 120 is housed within the mobile chamber 110. The irrigation piping system 120 includes an inlet pipe, an outlet pipe, and a filter assembly. The inlet pipe is connected to the inlet of the mobile chamber 110, the outlet pipe is connected to the outlet of the mobile chamber 110, and the filter assembly is connected between the inlet pipe and the outlet pipe.

[0032] The fertilizer system 130 is housed in the mobile container 110. The fertilizer system 130 includes a fertilizer tank and a water injection pipe connected to the outlet pipe of the irrigation pipeline system 120 for injecting water into the fertilizer tank.

[0033] The fertilization and irrigation control system 140 is also housed within the mobile container 110. This fertilization and irrigation control system 140 includes a control module and a piping assembly connected to the irrigation piping system 120 and the fertilizer system 130 for mixed fertilizer application. The control module controls the water pump regulating module to adjust the irrigation parameters of the irrigation head 100, and also controls the piping assembly to adjust the fertilization parameters of the irrigation head 100.

[0034] As an example, Figure 2 A schematic side view of a mobile compartment 110 is shown.

[0035] like Figure 2 As shown, the mobile container 110 can be equipped with a water inlet 111 and a water outlet 112 on the same side wall. The water inlet 111 can be connected to a water source via a pipe, and water from the water source can enter the water inlet 111 through the pipe under the action of a water pump. The water outlet 112 can be connected to an irrigation channel in the farmland via a pipe. The water entering through the water inlet 111 is processed by various systems inside the mobile container 110 before flowing out through the water outlet 112, achieving precise irrigation and fertilization of crops in the farmland.

[0036] In addition to having a water inlet 111 and a water outlet 112, the mobile container 110 can also be equipped with a power interface and a water pump control interface for connecting power cables and water pump control cables. These power cables and water pump control cables can be connected to the control system inside the mobile container 110 through the interfaces on the mobile container 110.

[0037] The irrigation pipeline system 120 includes an inlet pipe, an outlet pipe, and a filter assembly. The inlet pipe can be connected to the inlet 111 of the mobile chamber 110, and the outlet pipe can be connected to the outlet 112 of the mobile chamber 110. A filter assembly is connected between the inlet pipe and the outlet pipe. The filter assembly is used to filter the water entering through the inlet pipe, so that the filtered water flows into the farmland through the outlet pipe for irrigation.

[0038] The fertilizer system 130 includes a fertilizer tank and a water injection pipe. The fertilizer tank holds the raw fertilizer, and the water injection pipe is positioned corresponding to the inlet of the fertilizer tank and can be connected to the outlet pipe of the irrigation system 120. Water from the outlet pipe can flow into the farmland for irrigation, and can also flow into the fertilizer tank through the water injection pipe to dilute the raw fertilizer, thereby adjusting fertilizer parameters such as electrical conductivity (EC) and potential hydrogen pH.

[0039] In addition to the aforementioned mobile container 110, irrigation pipeline system 120, and fertilizer system 130, the irrigation head 100 also includes a core component—a fertilizer irrigation control system 140. This fertilizer irrigation control system 140 can be used to control the fertilization parameters of the irrigation head 100, wherein the fertilization parameters may include the EC of the fertilizer.

[0040] Specifically, the fertilization and irrigation control system 140 may include a control module and a piping assembly. The piping assembly may include multiple pipes and valves, etc., for connecting the irrigation piping system 120 and the fertilizer system 130. Specifically, the piping assembly may be connected to the water outlet pipe in the irrigation piping system 120 and the fertilizer tank in the fertilizer system 130.

[0041] In addition, since the pipe assembly is connected to the irrigation pipe system 120 and the fertilizer system 130 to achieve the fertilizer mixing effect, the control module can also be used to control the components in the pipe assembly (such as valves) to control the ratio of water and fertilizer and the time of water or fertilizer addition during the fertilizer mixing process, thereby controlling and adjusting the fertilization parameters of the irrigation head 100.

[0042] By way of example and not limitation, the control module mentioned above includes, but is not limited to, a programmable logic controller (PLC), a programmable automation controller (PAC), an embedded controller, etc. The embodiments of this application do not limit the specific type of control module.

[0043] Figure 3 A schematic three-dimensional structural diagram of an irrigation head 100 provided in an embodiment of this application is shown. In this schematic diagram, in order to facilitate observation of the various system structures inside the mobile chamber 110, the four side walls and the top wall of the mobile chamber 110 are hidden, and only the bottom plate and traction structure of the mobile chamber 110 are retained.

[0044] See Figure 3 The irrigation head 100 mainly houses three parts: an irrigation pipeline system 120, a fertilizer system 130, and a fertilizer and irrigation control system 140.

[0045] Below, firstly, in combination with Figure 3 The specific structure of the irrigation pipeline system 120 in the irrigation head 100 is described.

[0046] like Figure 3 As shown, the irrigation pipeline system 120 mainly includes: inlet pipe 121, outlet pipe 122, and intermediate pipe 123.

[0047] Next, let's combine Figure 3 The specific structure of the fertilizer system 130 in the irrigation head 100 is described.

[0048] like Figure 3 As shown, the fertilizer system 130 mainly includes a fertilizer tank 131 and a water injection pipe 132. The fertilizer tank 131 can be installed between the inlet pipe 121 and the outlet pipe 122 in the irrigation pipe system 120. One end of the water injection pipe 132 can be connected to the top of the fertilizer tank 131, and the other end can be connected to the outlet pipe 122 in the irrigation pipe system 120, so that the aqueous solution flowing out of the outlet pipe 122 can enter the fertilizer tank 131 through the water injection pipe 132 to dilute the source fertilizer in the fertilizer tank 131.

[0049] Optionally, a water injection valve may be installed on the water injection pipe 132. The water injection valve can be connected to the fertilizer irrigation control system 140 via wired or wireless means, so that the fertilizer irrigation control system 140 can control the opening and closing state of the water injection valve, thereby controlling the dilution of fertilizer in fertilizer tank 131.

[0050] Figure 4Another schematic perspective view of the irrigation head 100 provided in an embodiment of this application is shown. Figure 4 and Figure 3 These are three-dimensional images of the same irrigation head 100 from different perspectives.

[0051] like Figure 4 As shown, the fertilization and irrigation control system 140 can be an integrated machine for realizing fertilization, irrigation, and water pump regulation. Specifically, the fertilization and irrigation control system 140 may include: a control module 141 and a pipeline assembly 142.

[0052] As described above, control module 141 may include, for example, a control system of the type of PLC.

[0053] The pipe assembly 142 can be connected to the irrigation pipe system 120 and the fertilizer system 130 via external connecting pipes. Specifically, the pipe assembly 142 may include an inlet sub-pipe, an outlet sub-pipe, and a fertilizer suction sub-pipe, which can be connected to the irrigation pipe system 120 and the fertilizer system 130 respectively via three connecting pipes.

[0054] Figure 5 A schematic perspective view of the pipe assembly 142 in the fertilization and irrigation control system 140 provided in this application embodiment is shown. In this schematic diagram, the left side wall of the cabinet where the pipe assembly 142 is located is hidden to facilitate observation of the specific structure of the pipe assembly 142.

[0055] like Figure 5 As shown, the pipeline assembly 142 includes: a water inlet assembly 1401, a water outlet assembly 1402, a fertilizer absorption assembly 1403, and a fertilizer mixing assembly 1404. The water inlet assembly 1401 and the water outlet assembly 1402 are connected to the irrigation pipeline system 120, the fertilizer absorption assembly 1403 is connected to the fertilizer system 130, and the fertilizer mixing assembly 1404 is used to mix the water in the water inlet assembly 1401 and the fertilizer in the fertilizer system 130 for transmission to the water outlet assembly 1402.

[0056] Figure 6 It shows Figure 5 A magnified view of part A in the diagram.

[0057] like Figure 6 As shown, Figure 6 The water inlet component 1401 may include a water inlet sub-pipe 1424, the water inlet 1421 of which is connected to the water outlet pipe 122 of the irrigation pipe system 120.

[0058] Figure 6The water outlet component 1402 may include a water outlet sub-pipe 1425, the water outlet 1425 having an outlet 1422 connected to the water outlet pipe 122 of the irrigation pipe system 120. Optionally, the location where the water outlet 1422 is connected to the water outlet pipe 122 may be upstream of the location where the water inlet 1421 is connected to the water outlet pipe 122.

[0059] See also Figure 6 The above Figure 5 The fertilizer suction component 1403 may include a fertilizer suction sub-pipe 1426, the fertilizer suction port 1423 of which is connected to the fertilizer tank 131 of the fertilizer system 130.

[0060] The fertilizer suction pipe 1426 may be equipped with a fertilizer suction port valve 1427, which can control the flow rate of fertilizer passing through the fertilizer suction pipe 1426. In some examples, the fertilizer suction port valve 1427 can be an electric ball valve, in which the opening ratio of the valve can be controlled by controlling the rotation of the ball in the valve.

[0061] In some embodiments, the fertilizer suction port valve 1427 can be connected to the control module 141 in the fertilizer irrigation control system 140 via wired or wireless means. The control module 141 can control the opening ratio of the fertilizer suction port valve 1427, thereby controlling the flow rate of fertilizer in the fertilizer suction sub-pipe 1426, so as to control the EC of fertilizer in the irrigation head 100.

[0062] See also Figure 6 As shown above, Figure 5 The fertilizer mixing assembly 1404 includes a pump 1428, a first fertilizer mixing pipe 1429, and a second fertilizer mixing pipe 1430. One end of the first fertilizer mixing pipe 1429 is connected to the water inlet sub-pipe 1424 and the fertilizer suction sub-pipe 1426, and the other end of the first fertilizer mixing pipe 1429 is connected to the pump 1428. One end of the second fertilizer mixing pipe 1430 is connected to the pump 1428, and the other end of the second fertilizer mixing pipe 1430 is connected to the water outlet sub-pipe 1425. The control module 141 can control the frequency of the pump 1428 to control the EC of the fertilizer in the irrigation head 100.

[0063] The first fertilizer mixing pipe 1429 is located below the second fertilizer mixing pipe 1430. The first fertilizer mixing pipe 1429 is equipped with a water outlet valve 1431, which is used to discharge the liquid remaining in the pump 1428 when the irrigation head 100 stops working.

[0064] Optionally, in this embodiment of the application, the first fertilizer mixing pipe 1429 can be connected to the water inlet sub-pipe 1424 and the fertilizer suction sub-pipe 1426 via the jet injector 1432.

[0065] Optionally, in addition to the components described above, the fertilizer mixing assembly 1404 is provided with an EC detector 1433.

[0066] As an example, such as Figure 6 As shown, an EC detector 1433 may be installed in the fertilizer mixing assembly 1404, which can detect EC. The detection inlet of the EC detector 1433 may be located in the water inlet sub-pipe 1424, and the detection outlet of the EC detector 1433 may be located in the first fertilizer mixing pipe 1429. Specifically, the EC of the solution in the water inlet sub-pipe 1424 detected by the EC detector 1433 is the EC of the fertilizer solution that has entered the water outlet pipe 122 after being mixed with fertilizer, thus it can more effectively characterize the EC of the fertilizer solution provided to the farmland by the irrigation head 100.

[0067] Optionally, the EC detector can be connected to the control module 141 via wired or wireless means, so that the control module 141 can receive the real-time detected parameter values ​​to control the relevant components and thereby adjust the fertilization parameters of the irrigation head 100.

[0068] Optionally, in some embodiments of this application, the fertilization and irrigation control system 140 further includes a wireless communication module, which is used to receive wireless control commands and transmit the wireless control commands to the control module 141, so that the control module 141 controls the EC of the fertilizer in the irrigation head 100 according to the wireless control commands.

[0069] As an example, the wireless communication module includes, but is not limited to, wireless local area network (WLAN) communication modules and wireless wide area network (WAN) communication modules. WAN communication modules include cellular network (e.g., 2G, 3G, 4G, 5G, etc.) modules and satellite communication modules. WLAN communication modules include Wi-Fi communication modules and Bluetooth communication modules. This application does not limit the specific method of wireless communication in its embodiments.

[0070] In a specific implementation, users can send relevant instructions to the fertilizer irrigation control system 140 through an application (App) on a smart terminal and a wireless network, so that the fertilizer irrigation control system 140 can control the EC of fertilizer according to the user's instructions.

[0071] Optionally, in some embodiments of this application, the fertilization and irrigation control system 140 further includes a user interaction module for receiving user input commands and sending the input commands to the control module 141, so that the control module 141 can control the EC of the fertilizer in the irrigation head 100 according to the input commands.

[0072] As an example, see [link / reference] Figure 4 and Figure 5As shown, in the fertilization and irrigation control system 140, the cabinet where the control module 141 is located can be equipped with a display panel and user interaction modules such as buttons. Users can input commands to the control module 141 through buttons or a display panel with touch function, such as the target EC of fertilizer.

[0073] It is understood that, in addition to the display panel and buttons shown in the figure, the user interaction module can also be a keyboard, microphone, handwriting tablet, and other types of user input devices. This application does not make any specific limitations on this.

[0074] Figure 7 A schematic flowchart of a method 700 for adjusting fertilizer conductivity according to an embodiment of this application is shown. This method 700 is applied to the mobile irrigation head described above, such as... Figure 7 As shown, the method 700 includes:

[0075] S701, in response to the first command, the pump 1428 and the fertilizer inlet valve 1427 are opened under the first operating condition. The first command is used to indicate the start of fertilization. The frequency of the pump 1428 corresponding to the first operating condition is the full frequency, and the fertilizer inlet valve 1427 is at its minimum opening.

[0076] After receiving the first instruction, the mobile irrigation head determines that the first instruction is for starting fertilization. It can start the pump 1428 at full frequency and open the fertilizer inlet valve 1427 at minimum opening.

[0077] In some embodiments, the minimum opening degree of the fertilizer inlet valve 1427 is 2%.

[0078] In some embodiments, the full frequency is 50 Hz.

[0079] In some embodiments, the first instruction may be given by the user through a user interaction module.

[0080] In some embodiments, the first instruction may be issued by a smart agriculture processing platform, that is, the smart agriculture processing platform can detect various data in agricultural production and determine that fertilization is needed based on the data, and can issue the first instruction to the mobile irrigation head.

[0081] In some embodiments, the first instruction may be issued by the user through a terminal device.

[0082] S702, when the conductivity of the fertilizer is detected to be greater than the target value, the frequency of the pump 1428 is reduced so that the difference between the conductivity and the target value is less than or equal to the first threshold.

[0083] S703, when the conductivity is detected to be less than the target value, the opening of the fertilizer inlet valve 1427 is first increased to make the conductivity greater than the target value, and after the conductivity is greater than the target value, the frequency of the pump 1428 is reduced so that the difference between the conductivity and the target value is less than or equal to the first threshold.

[0084] In this embodiment, the movable irrigation head can adjust the pump 1428 and / or the fertilizer suction valve 1427. It is understood that when the frequency of the pump 1428 is reduced, the conductivity of the fertilizer decreases; when the frequency of the pump 1428 is increased, the conductivity of the fertilizer increases. Similarly, when the opening of the fertilizer suction valve 1427 is reduced, the conductivity of the fertilizer decreases; when the opening of the fertilizer suction valve 1427 is increased, the conductivity of the fertilizer increases.

[0085] Understandably, when the first threshold is 0, the electrical conductivity of the fertilizer is equal to the target value after the mobile irrigation head performs step S702 or S703.

[0086] In some embodiments, the first instruction includes a target value, which the mobile irrigation head can determine by the first instruction.

[0087] The mobile irrigation head can detect the electrical conductivity of the fertilizer when the pump 1428 and the fertilizer inlet valve 1427 have been running in the first operating condition for a first duration.

[0088] In some embodiments, the first duration is 30 seconds.

[0089] When the mobile irrigation head detects that the conductivity of the fertilizer is greater than the target value, since the opening of the fertilizer inlet valve 1427 is at its minimum and the frequency of the pump 1428 is at its full frequency, the mobile irrigation head can reduce the frequency of the pump 1428, thereby making the difference between the conductivity of the fertilizer and the target value less than or equal to the first threshold.

[0090] In some embodiments, when the mobile irrigation head reduces the frequency of the pump 1428, the reduction step can be determined based on the ratio of the fertilizer's conductivity to the target value. The reduction step of the pump 1428 can also be referred to as the frequency reduction step.

[0091] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than 1.1, the reduction step is 0.3 Hz.

[0092] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than or equal to 1.05 and less than or equal to 1.1, the reduction step is 0.15 Hz.

[0093] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than 1 and less than or equal to 1.05, the reduction step is 0.05 Hz.

[0094] In this embodiment of the application, the duration corresponding to the reduction in stride length is not specifically limited. The duration corresponding to the reduction in stride length can be determined based on factors such as the type of fertilizer and the size of the fertilizer particles.

[0095] For example, when the fertilizer is liquid fertilizer, the duration corresponding to the reduction in stride is duration #1, and when the fertilizer is granular fertilizer, the duration corresponding to the reduction in stride is duration #2. Therefore, duration #1 is less than duration #2.

[0096] It is understood that when the mobile irrigation head performs step S702, the step reduction may remain constant, or in other embodiments, the step reduction may vary.

[0097] For example, when the ratio of the fertilizer's conductivity to the target value is greater than 1.1, the mobile irrigation head can first reduce the frequency of pump 1428 by a reduction step of 0.3 Hz. When the ratio of the fertilizer's conductivity to the target value becomes greater than or equal to 1.05 and less than or equal to 1.1, the reduction step is adjusted from 0.3 Hz to 0.15 Hz. Similarly, when the ratio of the fertilizer's conductivity to the target value becomes greater than or equal to 1 and less than or equal to 1.05, the reduction step is adjusted from 0.15 Hz to 0.05 Hz. That is, when the mobile irrigation head performs step S702, the reduction step can be varied and gradually decreases.

[0098] For example, when the ratio of the fertilizer's electrical conductivity to the target value is greater than or equal to 1 and less than or equal to 1.05, the reduction step is 0.05 Hz. That is, when the mobile irrigation head performs step S702, the reduction step can remain unchanged.

[0099] When the mobile irrigation head detects that the conductivity is less than the target value, since the opening of the fertilizer inlet valve 1427 is at its minimum and the frequency of the pump 1428 is at its full frequency, in order to increase the conductivity of the fertilizer, the opening of the fertilizer inlet valve 1427 can be increased to make the conductivity greater than the target value. After the conductivity is greater than the target value, the frequency of the pump 1428 can be reduced so that the difference between the conductivity and the target value is less than or equal to the first threshold.

[0100] In this embodiment, since the minimum adjustment opening of the fertilizer inlet valve 1427 has a greater impact on the conductivity of the fertilizer than the minimum adjustment frequency of the pump 1428, the method by which the mobile irrigation head adjusts the opening of the fertilizer inlet valve 1427 is called coarse adjustment, and the method by which the mobile irrigation head adjusts the frequency of the pump 1428 is called fine adjustment. In other words, when the mobile irrigation head activates the fertilization function, if the conductivity of the fertilizer is detected to be less than or equal to the target value, coarse adjustment can be performed first, followed by fine adjustment.

[0101] In some embodiments, when the movable irrigation head increases the opening of the fertilizer inlet valve 1427, the step size can be determined based on the ratio of the fertilizer's conductivity to the target value.

[0102] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is less than 0.5, the increment is 10%.

[0103] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than or equal to 0.5 and less than 0.8, the increment is 5%.

[0104] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than or equal to 0.8 and less than 1, the increment is 2%.

[0105] It is understood that when the mobile irrigation head performs step S703, the increase in step length may remain constant, or in other embodiments, the increase in step length may vary.

[0106] For example, when the ratio of the fertilizer's conductivity to the target value is less than 0.5, the mobile irrigation head can initially increase the opening of the fertilizer inlet valve 1427 by an increment of 10%. When the ratio of the fertilizer's conductivity to the target value becomes greater than or equal to 0.5 and less than 0.8, the increment is adjusted from 10% to 5%. Similarly, when the ratio of the fertilizer's conductivity to the target value becomes greater than or equal to 0.8 and less than 1, the increment is adjusted from 5% to 2%. That is, when the mobile irrigation head performs step S703, the increment can vary and gradually decrease.

[0107] For example, when the ratio of the fertilizer's electrical conductivity to the target value is greater than or equal to 0.8 and less than 1, the step size is increased by 2%. That is, when the mobile irrigation head performs step S703, the step size can remain unchanged.

[0108] It is understandable that since the minimum adjustment opening of the fertilizer inlet valve 1427 has a significant impact on the conductivity of the fertilizer, increasing the opening of the fertilizer inlet valve 1427 may cause the conductivity of the fertilizer to exceed the target value. Therefore, the mobile irrigation head may no longer need to adjust the opening of the fertilizer inlet valve 1427, but instead reduce the frequency of the pump 1428.

[0109] It should be understood that when the mobile irrigation head determines that the conductivity of the fertilizer is greater than the target value, the frequency of the pump 1428 can be reduced as described above. For details, please refer to the above text. For the sake of brevity, it will not be repeated here.

[0110] In this embodiment, after the mobile irrigation head receives the first instruction, it can start the pump at full frequency and open the fertilizer inlet valve at minimum opening. When the conductivity of the fertilizer is detected to be greater than the target value, the conductivity can be reduced by decreasing the pump frequency. When the conductivity of the fertilizer is detected to be less than the target value, the opening of the fertilizer inlet valve can be increased first to make the conductivity of the fertilizer greater than the target value, and then the conductivity can be reduced by decreasing the pump frequency, so that the difference between the conductivity and the target value is less than or equal to a first threshold.

[0111] As described above, when the mobile irrigation head activates the fertilization function, the frequency of the pump 1428 and the opening of the fertilizer inlet valve 1427 can be adjusted so that the difference between the fertilizer conductivity and the target value is less than or equal to a first threshold. In some other embodiments of this application, the mobile irrigation head can also dynamically adjust the fertilizer conductivity during the fertilization process.

[0112] In some embodiments, after reducing the frequency of pump 1428, or after first increasing the opening of fertilizer inlet valve 1427 and then reducing the frequency of pump 1428, the method 700 further includes:

[0113] When the conductivity is detected to be greater than the target value, the frequency of the pump 1428 is reduced, or the opening of the fertilizer inlet valve 1427 is reduced, or the opening of the fertilizer inlet valve 1427 is reduced first, and after the conductivity is less than the target value, the frequency of the pump 1428 is increased, so that the difference between the conductivity and the target value is less than or equal to the first threshold.

[0114] As mentioned above, when the mobile irrigation head activates the fertilization function, it adjusts the frequency of the pump 1428 and the opening of the fertilizer inlet valve 1427. Therefore, the frequency of the pump 1428 may no longer be at full frequency, and the opening of the fertilizer inlet valve 1427 may no longer be at its minimum opening. When the mobile irrigation head performs the fertilization function, the conductivity of the fertilizer may fluctuate. When the conductivity is detected to be greater than the target value, the mobile irrigation head can reduce the frequency of the pump 1428, or reduce the opening of the fertilizer inlet valve 1427, or first reduce the opening of the fertilizer inlet valve 1427, and then increase the frequency of the pump 1428 after the conductivity is less than the target value.

[0115] It should be noted that the reason why the mobile irrigation head first reduces the opening of the fertilizer inlet valve 1427 and then increases the frequency of the pump 1428 after the conductivity is less than the target value is that the fertilizer inlet valve 1427 is a ball valve, and the minimum adjustment opening has a significant impact on the conductivity of the fertilizer. Therefore, in the process of reducing the opening, the conductivity of the fertilizer may be lower than the target value. In this case, the frequency of the pump 1428 can be increased.

[0116] In this embodiment of the application, when the electrical conductivity of the fertilizer is greater than the target value during the fertilization process, the mobile irrigation head can be adjusted in the above three ways. The mobile irrigation head can ultimately determine the adjustment method based on the ratio of electrical conductivity to the target value.

[0117] In some embodiments, when the ratio of conductivity to the target value is greater than a second threshold, the mobile irrigation head can reduce the opening of the fertilizer inlet valve 1427, or first reduce the opening of the fertilizer inlet valve 1427, and then increase the frequency of the pump 1428 after the conductivity is less than the target value.

[0118] In some embodiments, when the ratio of conductivity to the benchmark value is less than or equal to a second threshold, the mobile irrigation head can reduce the frequency of the pump 1428.

[0119] For example, when the ratio of conductivity to the target value is greater than 1.1, the mobile irrigation head can reduce the opening of the fertilizer inlet valve 1427, or first reduce the opening of the fertilizer inlet valve 1427, and then increase the frequency of the pump 1428 after the conductivity is less than the target value. When the ratio of conductivity to the target value is less than or equal to 1.1, the mobile irrigation head can reduce the frequency of the pump 1428.

[0120] In some embodiments, the adjustment step of the mobile irrigation head when reducing the frequency of the pump 1428, or reducing the opening of the fertilizer inlet valve 1427, or first reducing the opening of the fertilizer inlet valve 1427 and then increasing the frequency of the pump 1428 after the conductivity is less than the target value, can be determined based on the ratio of the fertilizer conductivity to the target value, wherein the adjustment step includes reducing the step and increasing the step.

[0121] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than 1.1, the reduction step of the pump 1428 is 0.3 Hz.

[0122] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than or equal to 1.05 and less than or equal to 1.1, the reduction step of the pump 1428 is 0.15 Hz.

[0123] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than 1 and less than or equal to 1.05, the reduction step of the pump 1428 is 0.05 Hz.

[0124] In some embodiments, when the ratio of the fertilizer's conductivity to the target value is greater than 1.1, the reduction step of the fertilizer inlet valve 1427 is 10%.

[0125] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than or equal to 1.05 and less than or equal to 1.1, the reduction step of the fertilizer inlet valve 1427 is 5%.

[0126] In some embodiments, when the ratio of the fertilizer's conductivity to the target value is greater than 1 and less than or equal to 1.05, the reduction step of the fertilizer inlet valve 1427 is 2%.

[0127] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is less than 0.9, the increment of the pump 1428 is 0.3 Hz.

[0128] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than or equal to 0.9 and less than or equal to 0.95, the increment of the pump 1428 is 0.15 Hz.

[0129] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than 0.95 and less than 1, the increment of the pump 1428 is 0.05 Hz.

[0130] In some embodiments, after reducing the frequency of the pump 1428, or after first increasing the opening of the fertilizer inlet valve 1427 and then reducing the frequency of the pump 1428, the method further includes:

[0131] When the conductivity is detected to be less than the target value, the frequency of the pump 1428 is increased, or the opening of the fertilizer inlet valve 1427 is increased, or the opening of the fertilizer inlet valve 1427 is increased first, and after the conductivity is greater than the target value, the frequency of the pump 1428 is reduced, so that the difference between the conductivity and the target value is less than or equal to the first threshold.

[0132] As mentioned above, when the mobile irrigation head activates the fertilization function, it adjusts the frequency of the pump 1428 and the opening of the fertilizer inlet valve 1427. Therefore, the frequency of the pump 1428 may no longer be at full frequency, and the opening of the fertilizer inlet valve 1427 may no longer be at its minimum opening. When the mobile irrigation head performs the fertilization function, the conductivity of the fertilizer may fluctuate. When the conductivity is detected to be lower than the target value, the mobile irrigation head can increase the frequency of the pump 1428, or increase the opening of the fertilizer inlet valve 1427, or first increase the opening of the fertilizer inlet valve 1427, and then decrease the frequency of the pump 1428 after the conductivity is lower than the target value.

[0133] It should be noted that the reason for first increasing the opening of the fertilizer inlet valve 1427 in the mobile irrigation head, and then reducing the frequency of the pump 1428 after the conductivity is greater than the target value, is that the fertilizer inlet valve 1427 is a ball valve, and the minimum adjustment opening has a significant impact on the conductivity of the fertilizer. Therefore, in the process of reducing the opening, the conductivity of the fertilizer may be greater than the target value. In this case, the frequency of the pump 1428 can be reduced further.

[0134] In this embodiment of the application, when the electrical conductivity of the fertilizer is less than the target value during the fertilization process, the mobile irrigation head can adjust it in the above three ways. The mobile irrigation head can ultimately determine the adjustment method based on the ratio of electrical conductivity to the target value.

[0135] In some embodiments, when the ratio of conductivity to the target value is less than a third threshold, the mobile irrigation head can first increase the opening of the fertilizer inlet valve 1427, and after the conductivity is greater than the target value, reduce the frequency of the pump 1428 or increase the opening of the fertilizer inlet valve 1427.

[0136] In some embodiments, the frequency of pump 1428 is increased when the ratio of conductivity to the specified value is greater than or equal to a third threshold.

[0137] For example, when the ratio of conductivity to the target value is less than 0.9, the mobile irrigation head can first increase the opening of the fertilizer inlet valve 1427, and then, after the conductivity exceeds the target value, reduce the frequency of the pump 1428 or increase the opening of the fertilizer inlet valve 1427. When the ratio of conductivity to the target value is less than or equal to 0.9, the mobile irrigation head can increase the frequency of the pump 1428.

[0138] In some embodiments, the adjustment step of the mobile irrigation head when increasing the frequency of the pump 1428, or increasing the opening of the fertilizer inlet valve 1427, or first increasing the opening of the fertilizer inlet valve 1427 and then decreasing the frequency of the pump 1428 after the conductivity is greater than the target value, can be determined based on the ratio of the conductivity of the fertilizer to the target value, wherein the adjustment step includes decreasing the step and increasing the step.

[0139] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is less than 0.9, the increment of the pump 1428 is 0.3 Hz.

[0140] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than or equal to 0.9 and less than or equal to 0.95, the increment of the pump 1428 is 0.15 Hz.

[0141] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than 0.95 and less than 1, the increment of the pump 1428 is 0.05 Hz.

[0142] In some embodiments, when the ratio of the fertilizer's conductivity to the target value is less than 0.5, the increment of the fertilizer inlet valve 1427 is 10%.

[0143] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than or equal to 0.5 and less than 0.8, the increment of the fertilizer inlet valve 1427 is 5%.

[0144] In some embodiments, when the ratio of the fertilizer's conductivity to the target value is greater than or equal to 0.8 and less than 1, the increment of the fertilizer inlet valve 1427 is 2%.

[0145] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than 1.1, the reduction step of the pump 1428 is 0.3 Hz.

[0146] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than or equal to 1.05 and less than or equal to 1.1, the reduction step of the pump 1428 is 0.15 Hz.

[0147] In some embodiments, when the ratio of the fertilizer's electrical conductivity to the target value is greater than 1 and less than or equal to 1.05, the reduction step of the pump 1428 is 0.05 Hz.

[0148] In this embodiment, the mobile irrigation head can dynamically adjust the electrical conductivity of the fertilizer during the fertilization process, and the electrical conductivity can be maintained at the target value, thereby ensuring the fertilization effect.

[0149] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described device can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0150] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative.

[0151] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0152] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for adjusting the electrical conductivity of fertilizer, characterized in that, The method is applied to a mobile irrigation head, and the method includes: In response to a first command, the pump (1428) and the fertilizer inlet valve (1427) are activated under a first operating condition, wherein the first command is used to instruct the start of fertilization, the pump (1428) is used to draw fertilizer, the fertilizer inlet valve (1427) is a ball valve, the frequency of the pump (1428) corresponding to the first operating condition is the full frequency, and the opening degree of the fertilizer inlet valve (1427) is the minimum opening degree; When the electrical conductivity of the fertilizer is detected to be greater than the target value, the frequency of the pump (1428) is reduced so that the difference between the electrical conductivity and the target value is less than or equal to a first threshold; or When the conductivity is detected to be less than the target value, the opening of the fertilizer inlet valve (1427) is first increased to make the conductivity greater than the target value. After the conductivity is greater than the target value, the frequency of the pump (1428) is reduced so that the difference between the conductivity and the target value is less than or equal to a first threshold. After reducing the frequency of the pump (1428), or after first increasing the opening of the fertilizer inlet valve (1427) and then reducing the frequency of the pump (1428), the method further includes: When the conductivity is detected to be greater than the target value, the frequency of the pump (1428) is reduced, or the opening of the fertilizer inlet valve (1427) is reduced, or the opening of the fertilizer inlet valve (1427) is reduced first, and after the conductivity is less than the target value, the frequency of the pump (1428) is increased, so that the difference between the conductivity and the target value is less than or equal to a first threshold; or When the conductivity is detected to be less than the target value, the frequency of the pump (1428) is increased, or the opening of the fertilizer inlet valve (1427) is increased, or the opening of the fertilizer inlet valve (1427) is increased first, and after the conductivity is greater than the target value, the frequency of the pump (1428) is reduced, so that the difference between the conductivity and the target value is less than or equal to a first threshold. The step of reducing the frequency of the pump (1428) or reducing the opening of the fertilizer inlet valve (1427) when the conductivity is detected to be greater than the target value, or first reducing the opening of the fertilizer inlet valve (1427), and then increasing the frequency of the pump (1428) after the conductivity is less than the target value, includes: When the ratio of the conductivity to the target value is greater than the second threshold, the opening of the fertilizer inlet valve (1427) is reduced, or the opening of the fertilizer inlet valve (1427) is reduced first, and after the conductivity is less than the target value, the frequency of the pump (1428) is increased; or When the ratio of the conductivity to the target value is less than or equal to the second threshold, the frequency of the pump (1428) is reduced.

2. The method according to claim 1, characterized in that, When the conductivity is detected to be less than the target value, the frequency of the pump (1428) is increased, or the opening of the fertilizer inlet valve (1427) is increased, or the opening of the fertilizer inlet valve (1427) is increased first, and the frequency of the pump (1428) is decreased after the conductivity is greater than the target value, including: When the ratio of the conductivity to the target value is less than a third threshold, increase the opening of the fertilizer inlet valve (1427), or first increase the opening of the fertilizer inlet valve (1427), and then decrease the frequency of the pump (1428) after the conductivity is greater than the target value; or When the ratio of the conductivity to the target value is greater than or equal to the third threshold, the frequency of the pump (1428) is increased.

3. The method according to claim 1 or 2, characterized in that, The adjustment steps of the fertilizer inlet valve (1427) and the pump (1428) are determined based on the ratio of the conductivity to the target value.

4. The method according to claim 1 or 2, characterized in that, When the detected conductivity of the fertilizer is greater than the target value, reducing the frequency of the pump (1428) includes: When the conductivity is detected to be greater than the target value, the reduction step of the pump (1428) is determined; The frequency of the pump (1428) is reduced according to the reduction step size.

5. The method according to claim 4, characterized in that, Determining the reduction step of the pump (1428) includes: Determine the ratio of the conductivity to the target value; The reduction step of the pump (1428) is determined based on the ratio of the conductivity to the target value.

6. The method according to claim 1 or 2, characterized in that, When the conductivity is detected to be less than the target value, the opening of the fertilizer inlet valve (1427) is first increased to make the conductivity greater than the target value, and after the conductivity is greater than the target value, the frequency of the pump (1428) is then reduced, including: When the conductivity is detected to be less than the target value, the increase step of the fertilizer inlet valve (1427) is determined, and when the conductivity is greater than the target value, the decrease step of the pump (1428) is determined. The opening degree of the fertilizer inlet valve (1427) is increased according to the increasing step of the fertilizer inlet valve (1427), and after the conductivity is greater than the target value, the step of the pump (1428) is reduced according to the decreasing step of the pump (1428).

7. The method according to claim 6, characterized in that, The determination of the increment of the fertilizer inlet valve (1427) and the determination of the decrement of the pump (1428) after the conductivity is greater than the target value include: The increase step of the fertilizer inlet valve (1427) and the decrease step of the pump (1428) are determined based on the ratio of the conductivity to the target value.

8. A mobile irrigation head, characterized in that, The mobile irrigation head includes a mobile compartment (110), an irrigation pipeline system (120), a fertilizer system (130), and a fertilizer irrigation control system (140). The irrigation pipeline system (120), the fertilizer system (130), and the fertilizer irrigation control system (140) are housed in the mobile compartment (110). The fertilizer irrigation control system (140) includes a control module (141) and a pipeline assembly (142). The pipeline assembly (142) is connected to the irrigation pipeline system (120) and the fertilizer system (130) for water and fertilizer mixing. The pipeline assembly (142) includes a fertilizer inlet valve (1427) and a pump (1428). The fertilizer inlet valve (1427) and the pump (1428) are used to control the flow rate of fertilizer. The pipeline assembly (142) is equipped with a conductivity detector (1433). The control module (141) is used to perform the method as described in any one of claims 1 to 7.

Images