A smart irrigation system for desert afforestation and its application method

Abstract

This invention relates to an intelligent irrigation system and its application method for desert afforestation. The intelligent irrigation system includes: underground irrigation units, a water storage tank, water delivery tributary pipelines, a central controller, and a weather station, a photovoltaic power generation module, and a soil moisture sensor interconnected with the central controller via the Internet of Things. The central controller includes an artificial intelligence algorithm. The water delivery tributary pipelines are connected to the outlet valves of the water storage tank, and at least three water delivery tributary pipelines are provided. Multiple underground irrigation units are installed near the trees along the water delivery tributary pipelines. The intelligent irrigation system and its application method of this invention introduce artificial intelligence algorithms to achieve precise and automated irrigation. Simultaneously, the number and installation location of the underground irrigation units can be determined as needed and integrated into the drip irrigation system, reducing the waste of labor, water resources, and energy.

Description

Technical Field

[0001] This invention relates to the field of desert afforestation technology, specifically to an intelligent irrigation system for desert afforestation and its application method. Background Technology

[0002] my country is one of the countries most severely affected by desertification in the world. Currently, the total area of ​​desertified land in my country is 2.5737 million square kilometers, accounting for 26.81% of the total land area. After more than half a century of unremitting efforts, my country has made great progress in both theoretical and technological aspects of desertification control. In the process of scientific desertification control and afforestation, besides the scientific selection and layout of vegetation, providing water resources for sand-fixing vegetation is another crucial aspect. Generally, by adopting a series of desert water-saving irrigation technologies such as drip irrigation, zoned irrigation, solar pumps, and irrigation water recycling, it is possible to increase crop yields while reducing water waste, achieving resource conservation and efficient utilization. Traditional drip irrigation is mainly distributed on the ground, and the amount of irrigation water is mainly controlled by experience and manual labor. Furthermore, installing and integrating underground drip irrigation systems presents difficulties, ultimately preventing water from being directly delivered to the roots of vegetation, resulting in a significant waste of water resources. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by providing an intelligent irrigation system for desert afforestation and its application method. The intelligent irrigation system of this invention incorporates artificial intelligence algorithms to assess plant needs, soil moisture, and weather conditions in real time, thereby achieving precise and automated irrigation. Furthermore, the underground irrigation units in the intelligent irrigation system can be integrated into the drip irrigation system according to the required quantity and installation location, reducing the need for specialized tools and the labor required for installation. Simultaneously, the photovoltaic power generation module in the intelligent irrigation system not only provides electricity to the system but also collects rainwater for irrigation. Therefore, the intelligent irrigation system of this invention optimizes water consumption, providing precise water at the required time and place, reducing water and energy waste.

[0004] On one hand, the present invention provides an intelligent irrigation system for desert afforestation, comprising: an underground irrigation unit, a water storage tank, a water conveyance tributary pipeline, a central controller, and a weather station, a photovoltaic power generation module, and a soil moisture sensor that are interconnected with the central controller via the Internet of Things; the central controller includes an artificial intelligence algorithm;

[0005] The water supply tributary pipeline is connected to the outlet valve of the water storage tank. At least three water supply tributary pipelines are provided. Multiple underground irrigation units are installed near the trees on the water supply tributary pipelines. The straight-line distance between each underground irrigation unit and the tree is H=50~80cm.

[0006] The underground irrigation unit includes a water storage column chamber. An irrigation column module communicating with the water storage column chamber is located at one position on the bottom edge of the water storage column chamber. At least one hollow needle is located at the center of the bottom of the water storage column chamber, communicating with the water storage column chamber. The pointed end of the hollow needle faces downwards, and the interior of the hollow needle contains a water-absorbing flexible needle core. One end of the water-absorbing flexible needle core is wrapped around a fixing hook of the water storage column chamber, and the other end extends through the interior of the hollow needle and protrudes from the pointed end of the hollow needle. A fixing column is located at another position on the bottom edge of the water storage column chamber.

[0007] The irrigation column module consists of one deep irrigation column, two middle irrigation columns, and two shallow irrigation columns. One middle irrigation column and one shallow irrigation column are arranged sequentially on each side of the deep irrigation column. The deep irrigation column has a length of h1 and a diameter of D1, the middle irrigation column has a length of h2 and a diameter of D2, and the shallow irrigation column has a length of h3 and a diameter of D3, where h3 < h2 < h1, and D1 < D2 < D3. The ends of all three irrigation columns are pointed. The pointed ends of the middle irrigation columns are tightly fitted to the outer wall of the deep irrigation column, and the pointed ends of the shallow irrigation columns are tightly fitted to the outer wall of the middle irrigation column. Each of the deep, middle, and shallow irrigation columns has multiple water outlets, with the density of the outlets gradually increasing downwards along the column. The soil moisture sensor is located on the outer wall of the shallow irrigation column.

[0008] The underground irrigation unit also includes a cover screwed onto the top of the water storage column chamber. The outer surface of the top of the cover is integrally formed with a needle for piercing and connecting the water delivery tributary pipe and a locking clamp for fixing and clamping the water delivery tributary pipe. The needle has a cavity that connects the water delivery tributary pipe and the water storage column chamber.

[0009] This invention divides the irrigation column module of the underground irrigation unit into three levels based on the different degrees of water loss at different depths of plant roots: deep irrigation column, middle irrigation column, and shallow irrigation column. The deeper the plant roots are, the lower the water loss rate, so most of the water can be supplied to the deep roots. The water around the roots that are closer to the soil surface is more easily lost, so the amount of water that can be irrigated should be greater than that of the deep roots.

[0010] In this invention, the hollow needle utilizes the attraction between the liquid surface and the solid surface, and the capillary action of capillary action to transport water from the water storage column chamber to the plant roots, preventing insufficient water supply to the roots when the drip holes of the irrigation column module become blocked.

[0011] The water outlet of the water storage tank and the water delivery tributary pipeline of the present invention are equipped with water pumps as needed. The water pumps are interconnected with the central controller and their working status is controlled by the central controller.

[0012] Furthermore, in the intelligent irrigation system of the present invention, at least one of the deep irrigation column, the middle irrigation column and the shallow irrigation column is provided with a double-wall structure, including: an inner wall and an outer wall; the holes on the inner wall and the outer wall do not overlap, and the interval between the inner wall and the outer wall is 0.3cm to 1.8cm.

[0013] The present invention provides a double-wall structure to effectively prevent water leakage caused by blockage of the water outlet holes or damage to the outer wall due to prolonged use.

[0014] Furthermore, in the intelligent irrigation system of the present invention, in the initial state, the underground irrigation unit has a 3-5 mm thick solid salt layer coated on the outside of the irrigation column module and the hollow needle, which dissolves upon contact with water.

[0015] Furthermore, in the intelligent irrigation system of the present invention, the solid salt layer is a potassium salt layer or a sodium salt layer.

[0016] After the underground irrigation unit of this invention is initially inserted into the underground soil, it is connected to a water supply branch pipe. Water enters the water storage column chamber and then flows into the irrigation column module, dissolving the solid salt layer and supplying water to the plant roots. Simultaneously, the dissolved solid salt layer can be used to provide nutrients to the plants.

[0017] Furthermore, in the intelligent irrigation system of the present invention, the photovoltaic power generation module includes a PV panel array and a rainwater collection trough. The rainwater collection trough is located below the PV panel array and is provided with a pipe leading to the water storage tank and a rainwater control valve. The rainwater control valve is electrically connected to the central controller.

[0018] Furthermore, in the intelligent irrigation system of the present invention, the PV panel array is arranged along the north-south direction, and the PV panel array is arranged to rotate around the longitudinal axis of the PV panel array in accordance with the sun's movement via a drive system, the drive system including an electric motor and a gear device.

[0019] Furthermore, in the intelligent irrigation system of the present invention, in the underground irrigation unit, at least two stabilizing wings are evenly arranged at the lowest end of both the irrigation column module and the fixed column.

[0020] Furthermore, in the intelligent irrigation system of the present invention, the underground irrigation unit is made of antibacterial material, or the underground irrigation unit has an antibacterial coating.

[0021] In this invention, the antibacterial material and antibacterial coating are used to prevent bacteria from easily growing at the outlet due to prolonged use, as the outlet is always in a moist state. Antibacterial properties can extend the service life of the drip irrigation system inserted underground.

[0022] Furthermore, in the intelligent irrigation system of the present invention, a pressure sensor is provided near the tip of the shallow irrigation column, and the pressure sensor communicates with the central controller via the Internet of Things.

[0023] This invention incorporates a pressure sensor to monitor the depth of the underground irrigation unit. Due to strong winds and sandstorms in arid regions, especially desert areas, the movement of sandstorms causes changes in the depth of the underground irrigation unit. To further prevent water loss, the underground irrigation unit must be maintained at a certain depth; if the depth becomes shallow, adjustments need to be made as needed.

[0024] On the other hand, the present invention provides an application method of the intelligent irrigation system described in any of the above claims, comprising: arranging and fixing the water delivery tributary pipe along the tree planting line, selecting the location of the underground irrigation unit, and using the piercing needle of the underground irrigation unit to pierce the water delivery tributary pipe corresponding to the selected location.

[0025] After collecting data, the central controller analyzes the collected data, generates an irrigation plan, and sends instructions to the outlet valve to control the water flow rate.

[0026] The data collection includes current weather information data provided by meteorological stations and soil moisture data provided by soil moisture sensors.

[0027] The data analysis includes using artificial intelligence algorithms to assess current soil conditions, weather forecasts, and historical data, and then providing an irrigation plan;

[0028] The photovoltaic power generation module provides power to the controller and collects rainwater on rainy days and sends it to the water storage tank.

[0029] Compared with the prior art, the present invention has the following beneficial technical effects:

[0030] This invention discloses an intelligent irrigation system and its application method for desert afforestation. On one hand, it introduces artificial intelligence algorithms to assess plant needs, soil moisture, and weather conditions in real time, thereby achieving precise and automated irrigation. On the other hand, the underground irrigation units in this intelligent irrigation system can be integrated into the drip irrigation system according to the required quantity and installation location, reducing the need for specialized tools and the labor required for installation. Simultaneously, the photovoltaic power generation module in this intelligent irrigation system not only provides electricity to the system but can also collect rainwater for irrigation. Therefore, this intelligent irrigation system optimizes water consumption, providing precise water at the required time and place, reducing water and energy waste. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the framework of an intelligent irrigation system according to a specific embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the application structure layout of the intelligent irrigation system according to a specific embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the underground irrigation unit structure according to a specific embodiment of the present invention;

[0034] Figure 4 This is a structural schematic diagram of the irrigation column module A-A' section according to a specific embodiment of the present invention;

[0035] Figure 5 This is a structural schematic diagram of the irrigation column module A-A' section according to a specific embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the double-layer structure of the deep irrigation column, the middle irrigation column, and the shallow irrigation column according to a specific embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the photovoltaic power generation module structure according to a specific embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the structure of a photovoltaic power generation module for collecting rainwater in rainy weather, according to a specific embodiment of the present invention.

[0039] The components include: 1. Photovoltaic power generation module, 2. Water storage tank, 3. Water transmission tributary pipeline, and 4. Underground irrigation unit.

[0040] 401. Water storage column chamber; 402. Irrigation column module; 403. Hollow needle; 4031. Water-absorbing flexible needle core; 4033. The other end of the water-absorbing flexible needle core; 4032. Tip of the hollow needle; 404. Fixing column.

[0041] 4021. Deep irrigation column; 4022. Middle irrigation column; 4023. Shallow irrigation column; 406. Needle; 405. Locking clamp; 408. Inner wall; 407. Outer wall.

[0042] 101. PV panel array; 103. Rainwater collection trough; 104. Underground water outlet pipe; 102. Support column. Detailed Implementation

[0043] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. The described embodiments are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Where specific conditions are not specified in the specific embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. When the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below by example do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims. The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. Specific Implementation Method 1

[0045] The present invention provides an intelligent irrigation system for desert afforestation, such as... Figure 1 and Figure 2 As shown, it includes: an underground irrigation unit 4, a water storage tank 2, a water conveyance tributary pipeline 3, a central controller, and a weather station, a photovoltaic power generation module 1, and a soil moisture sensor that are interconnected with the central controller via the Internet of Things; the central controller includes artificial intelligence algorithms;

[0046] The water supply tributary pipe 3 is connected to the outlet valve of the water storage tank 2. At least 3 water supply tributary pipes 3 are set up. Multiple underground irrigation units 4 are installed near the trees on the water supply tributary pipe 3. The straight-line distance between each underground irrigation unit 4 and the tree is H=50~80cm.

[0047] like Figure 3As shown, the underground irrigation unit 4 includes a water storage column chamber 401. An irrigation column module 402 communicating with the water storage column chamber 401 is located at one position on the bottom edge of the water storage column chamber 401. At least one hollow needle 403 is located at the center of the bottom of the water storage column chamber 401, communicating with the water storage column chamber 401. The tip of the hollow needle 403 faces downwards, and the interior of the hollow needle is provided with a water-absorbing flexible needle core 4031. One end of the water-absorbing flexible needle core 4031 is wrapped around a fixing hook of the water storage column chamber 401, and the other end 4033 extends through the interior of the hollow needle 403 and protrudes from the tip 4032 of the hollow needle. A fixing column 404 is located at another position on the bottom edge of the water storage column chamber 401.

[0048] The irrigation column module 402 consists of one deep irrigation column 4021, two middle irrigation columns 4022, and two shallow irrigation columns 4023. One middle irrigation column 4022 and one shallow irrigation column 4023 are arranged sequentially on each side of the deep irrigation column 4021. The deep irrigation column 4021 has a length of h1 and a diameter of D1, the middle irrigation column 4022 has a length of h2 and a diameter of D2, and the shallow irrigation column 4023 has a length of h3 and a diameter of D3, where h3 < h2 < h1, and D1 < D2 < D3. The deep irrigation column 4021… Both the middle irrigation column 4022 and the shallow irrigation column 4023 have pointed ends. The pointed end of the middle irrigation column 4022 is tightly attached to the outer wall of the deep irrigation column 4021, and the pointed end of the shallow irrigation column 4023 is tightly attached to the outer wall of the middle irrigation column 4022. The columns of the deep irrigation column 4021, the middle irrigation column 4022, and the shallow irrigation column 4023 are all provided with multiple water outlet holes, and the distribution density of the water outlet holes gradually increases along the column. The soil moisture sensor is installed on the outer wall of the shallow irrigation column 4023.

[0049] The underground irrigation unit 4 also includes a cover screwed onto the top of the water storage column chamber. The outer surface of the top of the cover is integrally formed with a needle 406 for piercing and connecting the water supply branch pipe 3 and a locking clamp 405 for fixing and clamping the water supply branch pipe 3. The needle 403 has a cavity that connects the water supply branch pipe 3 and the water storage column chamber 401.

[0050] Based on the different degrees of water loss at different depths of plant roots, the irrigation column module 402 of the underground irrigation unit 4 is divided into three steps: deep irrigation column 4021, middle irrigation column 4022 and shallow irrigation column 4023. The deeper the plant roots are, the smaller the water loss rate, so most of the water can be supplied to the deep roots. The water around the roots that are closer to the soil surface is more easily lost, so the amount of water that can be irrigated is relatively larger than that of the deep roots.

[0051] The hollow needle 403 utilizes the attraction between the liquid surface and the solid surface, and the capillary action of capillary phenomenon to transport water from the water storage column chamber 401 to the plant roots, preventing insufficient water supply to the roots when the drip holes of the irrigation column module 402 become blocked.

[0052] In some implementations, the tip is conical.

[0053] In some implementations, such as Figure 3 As shown, the cross-section of the irrigation column module 402 is obtained by cutting along A-A'. The arrangement of the deep irrigation column 4021, the middle irrigation column 4022, and the shallow irrigation column 4023 is as follows. Figure 4 or Figure 5 As shown.

[0054] In some embodiments, the walls of the deep irrigation column 4021, the middle irrigation column 4022, and the shallow irrigation column 4023 are interconnected.

[0055] In some embodiments, the walls of the deep irrigation column 4021, the middle irrigation column 4022, and the shallow irrigation column 4023 are not interconnected.

[0056] In some implementations, water pumps are installed at the outlet of the water storage tank 2 and on the water supply branch pipe 3 as needed. The water pumps are interconnected with the central controller, and their working status is controlled by the central controller.

[0057] In some implementations, such as Figure 5 As shown, the deep irrigation column 4021 is designed with a double-wall structure, including an inner wall 408 and an outer wall 407; the holes on the inner wall 408 and the outer wall 407 do not overlap, and the interval between the inner wall and the outer wall is 0.3cm to 1.8cm.

[0058] In some implementations, such as Figure 5 As shown, the central irrigation column is designed with a double-wall structure, including an inner wall 408 and an outer wall 407; the holes on the inner wall 408 and the outer wall 407 do not overlap, and the interval between the inner wall and the outer wall is 0.3cm to 1.8cm.

[0059] In some implementations, such as Figure 5 As shown, the shallow irrigation column 4023 is designed with a double-wall structure, including an inner wall 408 and an outer wall 407; the holes on the inner wall 408 and the outer wall 407 do not overlap, and the interval between the inner wall and the outer wall is 0.3cm to 1.8cm.

[0060] In some implementations, such as Figure 5As shown, the deep irrigation column 4021, the middle irrigation column 4022 and the shallow irrigation column 4023 are all designed with a double-wall structure, including an inner wall 408 and an outer wall 407; the holes on the inner wall 408 and the outer wall 407 do not overlap, and the interval between the inner wall and the outer wall is 0.3cm to 1.8cm.

[0061] In some implementations, such as Figure 5 As shown, both the deep irrigation column 4021 and the middle irrigation column are designed with a double-wall structure, including an inner wall 408 and an outer wall 407.

[0062] In some implementations, such as Figure 5 As shown, both the central irrigation column 4022 and the shallow irrigation column 4023 are designed with a double-wall structure.

[0063] In some implementations, such as Figure 5 As shown, both the deep irrigation column 4021 and the shallow irrigation column 4023 are designed with a double-wall structure.

[0064] The present invention provides a double-wall structure to effectively prevent water leakage caused by blockage of the water outlet holes or damage to the outer wall due to prolonged use.

[0065] In some embodiments, when the underground irrigation unit 4 is in its initial state, the exterior of the irrigation column module 402 and the hollow needle 403 are coated with a solid salt layer of 3-5 mm thickness, which dissolves upon contact with water.

[0066] In some implementations, the solid salt layer is a potassium salt layer or a sodium salt layer.

[0067] After the underground irrigation unit 4 of the present invention is initially inserted into the underground soil, it is connected to the water supply branch pipe 3. Water enters the water storage column chamber 401 and then flows into the irrigation column module 402, dissolving the solid salt layer and supplying water to the roots of the vegetation. At the same time, the dissolved solid salt layer can be used to provide plant nutrients.

[0068] In some implementations, such as Figure 7 As shown, the photovoltaic power generation module 1 includes a PV panel array 101 and a rainwater collection tank 103. The rainwater collection tank 103 is located below the PV panel array 101. The rainwater collection tank 103 is provided with a pipe leading to the water storage tank 2 and a rainwater control valve. The rainwater control valve is electrically connected to the central controller.

[0069] In some implementations, such as Figure 7 As shown, the PV panel array 101 is arranged along the north-south direction. The PV panel array 101 is arranged to rotate around the longitudinal axis of the PV panel array 101 in accordance with the remote motion of the sun via a drive system. The drive system includes an electric motor and a gear mechanism.

[0070] In some implementations, such as Figure 7 As shown, the rainwater collection tank 103 is configured as an underground water outlet pipe 104.

[0071] In some implementations, such as Figure 8 As shown, the acute angle between the PV panel array 101 and the support column 102 perpendicular to the ground is θ. In rainy weather, the central controller adjusts θ within the range of 45° to 75° through the drive system to ensure a high rainwater collection rate.

[0072] In some embodiments, in the underground irrigation unit 4, at least two stabilizing wings are evenly provided at the bottom of both the irrigation column module 402 and the fixed column 404.

[0073] In some embodiments, the underground irrigation unit 4 is made of antibacterial material, or the underground irrigation unit 4 has an antibacterial coating.

[0074] In this invention, the antibacterial material and antibacterial coating are used to prevent bacteria from easily growing at the outlet due to prolonged use, as the outlet is always in a moist state. Antibacterial properties can extend the service life of the drip irrigation system inserted underground.

[0075] In some implementations, a pressure sensor is provided near the tip of the shallow irrigation column 4023, and the pressure sensor communicates with a central controller via the Internet of Things.

[0076] This invention uses a pressure sensor to monitor the depth of the underground irrigation unit 4. Due to the strong winds and sandstorms in arid areas, especially desert areas, the movement of sandstorms causes changes in the depth of the underground irrigation unit 4. In order to further prevent water loss, it is necessary to ensure that the underground irrigation unit 4 is maintained at a certain depth; if the depth becomes shallow, it needs to be adjusted at any time. Specific Implementation Method Two

[0078] An application method of the intelligent irrigation system according to the above-described specific embodiment of the present invention includes: arranging and fixing the water delivery branch pipe 3 along the tree planting line; selecting the location of the underground irrigation unit 4; using the piercing needle 406 of the underground irrigation unit 4 to pierce the water delivery branch pipe 3 corresponding to the selected location; after the central controller collects data, it performs data analysis based on the collected data, then generates an irrigation plan and sends a command to the outlet valve to control the water flow rate;

[0079] Data collection includes current weather information provided by meteorological stations and soil moisture data provided by soil moisture sensors.

[0080] Data analysis involves using artificial intelligence algorithms to assess current soil conditions, weather forecasts, and historical data, and then generating irrigation plans.

[0081] The photovoltaic power generation module 1 provides power to the controller and collects rainwater on rainy days and sends it into the water storage tank 2.

[0082] This invention has been described through the specific embodiments and examples described above. Those skilled in the art should understand that various modifications and equivalent substitutions can be made to this invention without departing from its scope. Parts not described in detail in this specification are well-known to those skilled in the art. Furthermore, various modifications can be made to this invention for specific situations or circumstances without departing from its scope. Therefore, this invention is not limited to the specific embodiments disclosed, but should include all embodiments falling within the scope of the claims.

Claims

1. An intelligent irrigation system for desert afforestation, characterized in that, include: The system includes an underground irrigation unit, a water storage tank, water delivery tributary pipelines, a central controller, and a weather station, a photovoltaic power generation module, and a soil moisture sensor that are interconnected with the central controller via the Internet of Things; the central controller includes an artificial intelligence algorithm. The water supply tributary pipeline is connected to the outlet valve of the water storage tank. At least three water supply tributary pipelines are provided. Multiple underground irrigation units are installed near the trees on the water supply tributary pipelines. The straight-line distance between each underground irrigation unit and the tree is H=50~80cm. The underground irrigation unit includes a water storage column chamber. An irrigation column module communicating with the water storage column chamber is located on one side of the bottom edge of the water storage column chamber. At least one hollow needle is located at the center of the bottom of the water storage column chamber, communicating with the water storage column chamber. The pointed end of the hollow needle faces downwards, and the interior of the hollow needle contains a water-absorbing flexible needle core. One end of the water-absorbing flexible needle core is wrapped around a fixing hook of the water storage column chamber, and the other end extends through the interior of the hollow needle and protrudes from the pointed end of the hollow needle. A fixing column is located on the other side of the bottom edge of the water storage column chamber. The irrigation column module consists of one deep irrigation column, two middle irrigation columns, and two shallow irrigation columns. One middle irrigation column and one shallow irrigation column are arranged sequentially on each side of the deep irrigation column. The deep irrigation column has a length of h1 and a diameter of D1, the middle irrigation column has a length of h2 and a diameter of D2, and the shallow irrigation column has a length of h3 and a diameter of D3, where h3 < h2 < h1, and D1 < D2 < D3. The ends of all three irrigation columns are pointed. The pointed ends of the middle irrigation columns are tightly fitted to the outer wall of the deep irrigation column, and the pointed ends of the shallow irrigation columns are tightly fitted to the outer wall of the middle irrigation column. Each of the deep, middle, and shallow irrigation columns has multiple water outlets, with the density of the outlets gradually increasing downwards along the column. The soil moisture sensor is located on the outer wall of the shallow irrigation column. The underground irrigation unit also includes a cover screwed onto the top of the water storage column chamber. The outer surface of the top of the cover is integrally formed with a needle for piercing and connecting the water delivery tributary pipe and a locking clamp for fixing and clamping the water delivery tributary pipe. The needle has a cavity that connects the water delivery tributary pipe and the water storage column chamber.

2. The intelligent irrigation system according to claim 1, characterized in that, At least one of the deep irrigation column, the middle irrigation column, and the shallow irrigation column is provided with a double-wall structure, including an inner wall and an outer wall; the holes on the inner wall and the outer wall do not overlap, and the interval between the inner wall and the outer wall is 0.3cm to 1.8cm.

3. The intelligent irrigation system according to claim 2, characterized in that, In its initial state, the underground irrigation unit has a 3-5 mm thick solid salt layer coated on the outside of both the irrigation column module and the hollow needle. The solid salt layer dissolves upon contact with water.

4. The intelligent irrigation system according to claim 3, characterized in that, The solid salt layer is a potassium salt layer or a sodium salt layer.

5. The intelligent irrigation system according to claim 4, characterized in that, The photovoltaic power generation module includes a PV panel array and a rainwater collection tank. The rainwater collection tank is located below the PV panel array and is equipped with a pipe leading to the water storage tank and a rainwater control valve. The rainwater control valve is electrically connected to the central controller.

6. The intelligent irrigation system according to claim 5, characterized in that, The PV panel array is arranged along a north-south direction, and the PV panel array is arranged to rotate around the longitudinal axis of the PV panel array in accordance with the sun's movement via a drive system, the drive system including an electric motor and a gear mechanism.

7. The intelligent irrigation system according to claim 6, characterized in that, In the underground irrigation unit, at least two stabilizing wings are evenly arranged at the bottom of both the irrigation column module and the fixed column.

8. The intelligent irrigation system according to claim 7, characterized in that, The underground irrigation unit is made of antibacterial material, or the underground irrigation unit has an antibacterial coating.

9. The intelligent irrigation system according to claim 8, characterized in that, A pressure sensor is installed near the tip of the shallow irrigation column, and the pressure sensor communicates with the central controller via the Internet of Things.

10. An application method based on the intelligent irrigation system according to any one of claims 1 to 9, characterized in that, include: The water supply tributary pipes are arranged and fixedly installed along the tree planting line. The location of the underground irrigation unit is selected, and the needle of the underground irrigation unit is used to pierce the water supply tributary pipe corresponding to the selected location. After collecting data, the central controller analyzes the collected data, generates an irrigation plan, and sends instructions to the outlet valve to control the water flow rate. The data collection includes current weather information data provided by the meteorological station and soil moisture data provided by the soil moisture sensor; The data analysis includes using artificial intelligence algorithms to assess current soil conditions, weather forecasts, and historical data, and then providing an irrigation plan; The photovoltaic power generation module provides power to the controller and collects rainwater on rainy days and sends it to the water storage tank.

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