A soil moisture detection system and method

Abstract

This invention discloses a soil moisture monitoring system, comprising a detection rod with several monitoring modules mounted on it. Each monitoring module is connected to a processing module, which is connected to a battery. Several detection rods are provided, and the processing module on each rod is wirelessly connected to a terminal device via a communication module. Each monitoring module includes a heating device and a temperature sensor. The temperature sensor monitors the rate of temperature rise in the environment. The processing module acquires the rate of temperature rise and calculates the soil moisture using a temperature rise rate-soil moisture correspondence table. The communication module transmits the soil moisture to the terminal device, which summarizes the soil moisture and outputs a soil moisture distribution map. This invention innovatively uses the soil temperature rise rate to calculate soil moisture, addressing the problem that current conductivity calculation methods are easily affected by plant roots in the soil, thus improving the accuracy of soil moisture measurement.

Description

Technical Field

[0001] This invention relates to the field of agricultural irrigation, and more specifically, to a soil moisture detection system and method. Background Technology

[0002] Soil moisture is an important parameter of soil humidity and plays a vital role in fields such as automatic irrigation in large farms, precision agricultural production, and water-saving agricultural irrigation. In order to more accurately grasp soil moisture, it is necessary to detect soil moisture at different depths.

[0003] Most existing soil moisture monitoring devices are probes, such as the soil moisture meter with publication number CN111175351A, which has several humidity sensors mounted on a metal rod. These humidity sensors are all traditional humidity detection devices such as conductivity detection modules. In actual use, the conductivity detection is often greatly affected by plant roots, insects, earthworms, and garbage in the soil. For example, the roots between the electrodes act similarly to wires and have a higher conductivity than soil, which reduces the accuracy of soil moisture detection data. Moreover, existing soil moisture monitoring devices only detect data at a single point and cannot achieve the function of large-scale data collection and aggregation, which is not conducive to the development trend of automatic irrigation and water-saving irrigation in large farms.

[0004] Therefore, a new technical solution for soil moisture monitoring is needed to solve the above problems. Summary of the Invention

[0005] One objective of this invention is to provide a new technology solution for soil moisture detection, which innovatively uses the soil heating rate to calculate soil moisture, thereby solving the problem that current conductivity calculation methods are easily affected by plant roots in the soil, and improving the accuracy of soil moisture measurement.

[0006] According to a first aspect of the present invention, a soil moisture detection system is provided, comprising a detection rod, wherein a plurality of monitoring modules are disposed on the detection rod, the monitoring modules are connected to a processing module, a battery is connected to the processing module, and a plurality of detection rods are disposed thereon, wherein the processing module on each detection rod is wirelessly connected to a terminal device via a communication module; the monitoring module includes a heating device and a temperature sensor, the temperature sensor is used to monitor the rate of temperature rise of the environment, the processing module is used to acquire the rate of temperature rise and calculate the soil moisture using a rate of temperature rise-soil moisture correspondence table, the communication module is used to transmit the soil moisture to the terminal device, and the terminal device is used to summarize the soil moisture and output a soil moisture distribution map.

[0007] This solution utilizes the correlation between soil heating rate and soil moisture to calculate soil moisture. The soil moisture of each layer is then transmitted to the terminal device via a communication module, thereby generating a soil moisture distribution map.

[0008] Preferably, the detection rod includes a fixed plate, a telescopic rod, and a push rod. The monitoring module is evenly arranged on the telescopic rod. The push rod is fixed to the bottom end of the telescopic rod for controlling the telescopic movement. The top end of the telescopic rod is fixed to the fixed plate. The processing module and the communication module are both installed in the control box of the fixed plate.

[0009] This solution allows the push rod to drive the telescopic rod into the soil for data collection. The fixed plate is placed on the ground as a reference for soil depth measurement. The telescopic rod can extend into the soil to a certain depth. The current depth in the soil can be determined by the length of the push rod that is exposed. This avoids the depth measurement error caused by the obstruction of stones or other obstacles when inserting the traditional rigid measuring rod, thus improving the measurement accuracy in the vertical direction.

[0010] Preferably, the telescopic rod includes a plurality of nested measuring cylinders, the heating device and the temperature sensor are embedded in the outer surface of the measuring cylinder, and the wires of the heating device and the temperature sensor are connected to the processing module through the gaps between the measuring cylinders; the push rod is connected to the bottom measuring cylinder through the cavity in the middle of the measuring cylinder.

[0011] With this design, the bottommost measuring cylinder has the smallest diameter and is equipped with a cone-shaped soil-breaking head. When inserted into the soil, it can extend downwards from the inside to the outside. The temperature of each temperature sensor can be used to determine the current measuring cylinder inserted into the soil, and the depth of each temperature sensor can be determined based on the length of the measuring cylinder.

[0012] Preferably, the heating device includes a heating plate made of metal, in which heating wires are arranged, and the heating plate is arranged at least on the upper and lower sides of the temperature sensor.

[0013] This solution, with heating plates installed on both the top and bottom sides, ensures reliable heating and avoids the inability to accurately measure the soil temperature after heating due to water flow during the heating process.

[0014] Preferably, a second temperature sensor is provided on the side of the measuring cylinder that is not equipped with the heating device, and the second temperature sensor is connected to the processing module.

[0015] With this solution, the second temperature sensor can measure the unheated soil, thereby comparing it with the heated soil to obtain a more accurate soil heating rate, and can also determine whether the heating device is working properly.

[0016] Preferably, a wiring groove is provided on the inner wall of the measuring cylinder, through which the wires of the heating device, the temperature sensor, and the second temperature sensor extend into the control box.

[0017] This solution allows the cable trays to protect the wiring and also reduces the gaps between the measuring cylinders, preventing moisture or soil from entering and causing short circuits.

[0018] Preferably, it further includes a positioning module, which is used to detect the current position of the detection rod and send it to the processing module.

[0019] This solution enables the positioning module to locate the position of each detection rod, thereby forming a horizontal detection point matrix. Combined with the soil moisture measurements at different depths by each monitoring module, a precise three-dimensional distribution of soil moisture can be obtained.

[0020] Preferably, the fixing plate is hinged to two pedals on both sides, and the pedals can be rotated upward to a vertical storage position and flipped downward to a horizontal fixing position.

[0021] With this design, the pedal can be unfolded to secure the device in place after being stepped on, and to facilitate the insertion of the telescopic rod into the soil without lateral displacement. When folded into its storage position, it reduces the volume occupied and makes it easy to transport and move.

[0022] According to a second aspect of the present invention, a method for detecting soil moisture using the above-described soil moisture detection system is provided, comprising the following steps:

[0023] Step 1: Insert the test rods into the soil to be tested one by one to obtain the initial temperature of each layer of soil;

[0024] Step 2: Start the heating device to heat each layer of soil, and the temperature sensor periodically collects the real-time temperature of the current soil layer;

[0025] Step 3: The processing module obtains the initial temperature and real-time temperature, and calculates the heating rate of each soil layer based on time;

[0026] Step 4: Query the heating rate-soil moisture correspondence table to obtain the soil moisture of each layer based on the heating rate;

[0027] Step 5: The terminal device acquires the soil moisture of each layer collected by all the probes, summarizes and draws a soil moisture distribution map.

[0028] Preferably, the geographical coordinates of each probe are obtained at each test, and the soil moisture distribution map is drawn based on the geographical coordinates and the soil moisture.

[0029] According to one embodiment of this disclosure, the present invention innovatively uses the rate of soil warming to calculate soil moisture. Compared with traditional conductivity calculation, this can greatly reduce the impact of plant roots, soil-dwelling organisms, and soil debris, thus improving the accuracy of soil moisture calculation. Using this system, the three-dimensional distribution of soil moisture can be accurately obtained, which facilitates precise water supply for irrigation of soils with different moisture levels, providing accurate data for agricultural automation.

[0030] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0032] Figure 1 This is a schematic diagram of the soil moisture detection system according to an embodiment of the present invention;

[0033] Figure 2 yes Figure 1 Circuit structure block diagram of the soil moisture monitoring system;

[0034] Figure 3 yes Figure 1 Schematic diagram of the structure of the detection rod;

[0035] Figure 4 yes Figure 3 A schematic diagram of the structure when the detection rod is retracted;

[0036] Figure 5 yes Figure 3 A schematic diagram of the structure when the detection rod is not fully extended;

[0037] Figure 6 for Figure 3 Schematic diagram of the middle measuring cylinder;

[0038] Figure 7 for Figure 6 A cross-sectional view of the measuring cylinder.

[0039] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along the AA direction;

[0040] Figure 9 for Figure 6 Schematic diagram of the heating device;

[0041] Figure 10 for Figure 3A schematic diagram of the duplex structure of the central fixed plate;

[0042] Figure 11 A table showing the heating rate versus soil moisture correspondence in one embodiment of this application. Detailed Implementation

[0043] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0044] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0045] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0046] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0047] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0048] like Figure 1 and Figure 2 As shown, a soil moisture monitoring system in one embodiment of this application includes a detection rod 10, on which several monitoring modules 20 are mounted. The monitoring modules 20 are connected to a processing module 11, and a battery 12 is connected to the processing module 11. Several detection rods 10 are provided, and the processing module 11 on each detection rod 10 is wirelessly connected to a terminal device 30 via a communication module 14. The monitoring module 20 includes a heating device 211 and a temperature sensor 212. The temperature sensor 212 is used to monitor the heating rate of the environment. The processing module 11 is used to obtain the heating rate and calculate the soil moisture using a heating rate-soil moisture correspondence table. The communication module 14 is used to transmit the soil moisture to the terminal device 30. The terminal device 30 is used to summarize the soil moisture and output a soil moisture distribution map.

[0049] This embodiment of the system innovatively utilizes the correlation between soil heating rate and soil moisture to calculate soil moisture. Because there are numerous plant root remnants in arable land, compared to traditional methods of measuring moisture using conductivity, this significantly reduces the impact of soil root conductivity, thereby improving the accuracy of soil moisture measurement.

[0050] In this embodiment, the processing module 11 is an embedded module, such as a microcontroller, capable of receiving and processing data, and outputting corresponding data values. The terminal device 30 is a host computer or handheld device, such as a tablet computer or microcomputer, capable of processing large amounts of data and generating a visual interface for human-computer interaction.

[0051] Soil moisture content is related to the rate of temperature rise. Since water has a higher specific heat capacity than soil, soil with a higher moisture content will heat up more slowly when absorbing the same amount of heat. Even if there are many impurities such as plant roots in the soil, the rate of temperature rise will vary because its moisture content is different from that of the surrounding soil.

[0052] The monitoring module 20 is evenly arranged along the direction of the probe 10, so that the soil moisture of each layer can be measured. Each probe 10 is then transmitted to the terminal device 30 through the communication module 14. The computing power of the terminal device 30 is used to calculate the soil moisture distribution map.

[0053] In this embodiment, the detection rod 10 is equipped with a battery 12, a control box, and a switch. The battery 12 and the switch are both connected to the processing module 11 in the control box. The processing module 11 distributes power and processes data. When the switch is turned on, the processing module 11 provides equal power to each heating device 211 to ensure that the temperature of each heating device 211 is consistent.

[0054] In this embodiment, a positioning module 13 is also included. The positioning module 13 is used to detect the current position of the detection rod 10 and send it to the processing module 11. The positioning module 13 can locate the position of each detection rod 10, thereby forming a horizontal detection point matrix. Combined with the soil moisture at different depths measured by each monitoring module 20, an accurate three-dimensional soil moisture distribution can be obtained.

[0055] The positioning module 13, such as a GPS satellite positioning module 13 or a Beidou satellite positioning module 13, can accurately locate the coordinates of the detection rod 10, thereby accurately drawing a distribution map.

[0056] like Figure 3As shown, in one embodiment of this application, the detection rod 10 includes a fixed plate 100, a telescopic rod 200, and a push rod 300. The monitoring module 20 is evenly arranged on the telescopic rod 200. The push rod 300 is fixed to the bottom of the telescopic rod 200 for controlling its extension and retraction. The top of the telescopic rod 200 is fixed to the fixed plate 100. The processing module 11 and the communication module 14 are both installed in the control box of the fixed plate 100. The push rod 300 can drive the telescopic rod 200 to insert into the soil for data collection. The fixed plate 100 is placed on the ground as a reference for measuring soil depth. The telescopic rod 200 can extend into the soil to a certain depth. The current depth in the soil can be determined by the length of the push rod 300 that is exposed. This avoids the depth measurement error caused by the obstruction of stones or other obstacles when inserting a traditional rigid measuring rod, thus improving the measurement accuracy in the vertical direction.

[0057] like Figure 6 As shown, the telescopic rod 200 includes several nested measuring cylinders 210. A heating device 211 and a temperature sensor 212 are embedded in the outer surface of the measuring cylinder 210. The wires of the heating device 211 and the temperature sensor 212 are connected to the processing module 11 through the gaps between the measuring cylinders 210. The push rod 300 is connected to the bottom measuring cylinder 210 through the cavity in the middle of the measuring cylinder 210. The bottom measuring cylinder 210 has the smallest diameter and is equipped with a conical soil-breaking head 211 at the bottom. Figure 5 As shown, when inserted into the soil, it can be inserted downwards from the inside to the outside. The temperature of each temperature sensor 212 can be used to determine the current depth of the measuring cylinder 210 inserted into the soil. The depth of each temperature sensor 212 can be determined based on the length of the measuring cylinder 210.

[0058] To prevent debris from entering the measuring cylinder 210 and affecting its extension and retraction, a spring rubber sleeve 201 is provided on the outer sleeve of the push rod 300 to isolate the inside of the telescopic rod 200 from the outside world, thus preventing dirt adhering to the push rod 300 from being brought into the telescopic rod 200 and affecting its extension and retraction, or causing corrosion to the internal wiring.

[0059] The measuring cylinder 210 in this embodiment is made of metal, which has high rigidity and corrosion resistance, and can be inserted into the soil under the pushing force of the push rod 300. The upper end of the measuring cylinder 210 is provided with a flange, and the lower end of the measuring cylinder 210 is provided with a boss. The boss and the flange cooperate with each other to allow adjacent measuring cylinders 210 to slide and extend.

[0060] The bottom end of the push rod 300 is inserted into the telescopic rod 200 and fixed to the bottom of the bottom measuring cylinder 210. The top of the push rod 300 extends upward through the fixing plate 100 and is slidably connected to the fixing plate 100. A conical soil-breaking head 211 is fixed at the bottom of the bottom measuring cylinder 210. The push rod 300 is a metal rod with high rigidity, and its end is fixed with a handle 301 for easy pushing and pulling operation.

[0061] like Figure 7 and Figure 9 As shown, the heating device 211 includes a metal heating plate 2111, in which heating wires 2112 are arranged. The heating plate 2111 is arranged at least on the upper and lower sides of the temperature sensor 212. The presence of heating plates 2111 on both the upper and lower sides ensures the reliability of heating and avoids the inability to accurately measure the temperature of the heated soil due to water flow during the heating process.

[0062] like Figure 6 and Figure 7 As shown, a second temperature sensor 213 is installed on the side of the measuring cylinder 210 that is not equipped with the heating device 211. The second temperature sensor 213 is connected to the processing module 11. The second temperature sensor 213 can measure the unheated soil, thereby comparing it with the heated soil to obtain a more accurate soil heating rate, and can also determine whether the heating device 211 is working properly.

[0063] A conductivity sensor 214 is also installed at the second temperature sensor 213 to detect the conductivity of the soil, which serves as an auxiliary humidity detection. It is matched and integrated with the humidity measured by the monitoring module 20 to select a more accurate value as the humidity of the current soil layer. When the temperature sensor 212 or heating device 211 on a certain measuring cylinder 210 malfunctions, the humidity detected by the conductivity sensor 214 is used as the humidity of the current soil layer to avoid erroneous data that could lead to an inaccurate distribution map.

[0064] like Figure 7 and Figure 8 As shown, a wiring groove 215 is provided on the inner wall of the measuring cylinder 210. The wires of the heating device 211, the temperature sensor 212, and the second temperature sensor 213 all extend into the control box through the wiring groove. The wiring groove 215 can protect the wiring and also make the gaps between the measuring cylinders 210 smaller, preventing moisture or soil from entering and causing short circuits.

[0065] like Figure 10As shown, pedals 120 are hinged to both sides of the fixing plate 100. The pedals 120 can be rotated upwards to a vertical storage position and flipped downwards to a horizontal fixed position. The pedals 120 can be unfolded to facilitate fixing the position of the device after stepping on it, and to facilitate applying force to insert the telescopic rod 200 into the soil without lateral displacement; when folded into the storage position, it can reduce the volume occupied and facilitate transportation and movement.

[0066] The pedal 120 is hinged to the fixed plate 100 by two connecting rods. The space between the two connecting rods allows the control box and battery 12 on the fixed plate 100 to pass through without interference. The surface of the pedal 120 is provided with anti-slip patterns.

[0067] In one embodiment of this application, the soil moisture detection method using the above-mentioned soil moisture detection system includes the following steps:

[0068] Step 1: Insert the test rod 10 into the soil to be tested in sequence to obtain the initial temperature of each layer of soil;

[0069] In this step, multiple test rods 10 can be operated simultaneously, or a single test rod 10 can be used to measure sequentially. When using, place the fixing plate 100 at the position to be measured, hold the push rod 300 and push the telescopic rod 200 downwards to insert the telescopic rod 200 into the soil until it can no longer be pushed down.

[0070] Step 2: Start the heating device 211 to heat each layer of soil, and the temperature sensor 212 periodically collects the real-time temperature of the current layer of soil;

[0071] In this step, after the switch is turned on, the temperature sensor 212 first collects the temperature as the initial temperature. After the heating device 211 starts and reaches a constant temperature value for a certain period of time, it then periodically collects the real-time temperature. This periodicity can be, for example, every 30 seconds or 1 minute, and can be set according to soil type, season, etc., to ensure that the temperature rises to the threshold within the collection period. For example, in winter, the period can be set to be longer.

[0072] Step 3: Processing module 11 acquires the initial temperature and real-time temperature, and calculates the heating rate of each soil layer based on time;

[0073] In this step, the processing module 11 acquires the corresponding temperature on each measuring cylinder 210 and then calculates the heating rate of each layer. Since the telescopic rod 200 may not be fully inserted into the soil due to obstruction by stones, only the data from the measuring cylinders 210 inserted into the soil are used as valid data for calculation and transmission.

[0074] Since the data collected by the measuring cylinder 210, which is not inserted into the soil, are all outdoor temperatures, and the heating rate is the same as the heating rate in the air, when judging valid data, the heating rate can be compared with the heating rate in the air. If the heating rate is the same as the heating rate in the air, the data is judged to be invalid.

[0075] Step 4: Query the heating rate-soil moisture correspondence table to obtain the soil moisture of each layer based on the heating rate;

[0076] In this step, the corresponding table for heating rate and soil moisture is as follows: Figure 11 As shown, the heating rate-soil moisture correspondence table is completed before step 1. Multiple copies of this table can be made, each tailored to different seasons and soil types, to select different heating rate-soil moisture correspondence tables in different environments, thereby improving the accuracy of soil moisture detection.

[0077] Step 5: The terminal device 30 acquires the soil moisture of each layer collected by all the detection rods 10, summarizes and draws a soil moisture distribution map.

[0078] In this step, it is also necessary to obtain the geographical coordinates of each probe 10 at each test based on satellite positioning, and draw a three-dimensional distribution map of soil moisture based on the geographical coordinates and soil moisture at different depths.

[0079] The distribution map marks the soil moisture in the region using different colors or contour lines, thereby enabling refined agricultural production in different regions or providing accurate data for automated agricultural irrigation.

[0080] According to one embodiment of this disclosure, the present invention innovatively uses the rate of soil warming to calculate soil moisture. Compared with traditional conductivity calculation, this can greatly reduce the impact of plant roots, soil-dwelling organisms, and soil debris, thus improving the accuracy of soil moisture calculation. Using this system, the three-dimensional distribution of soil moisture can be accurately obtained, which facilitates precise water supply for irrigation of soils with different moisture levels, providing accurate data for agricultural automation.

[0081] It should be noted that the above detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0082] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0083] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0084] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0085] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, such as rotated 90 degrees or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0086] In the detailed description above, reference has been made to the accompanying drawings, which form part of this document. In the drawings, similar symbols typically identify similar parts unless the context otherwise indicates otherwise. The illustrated embodiments described in the detailed specification, drawings, and claims are not intended to be limiting. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the subject matter presented herein.

[0087] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A soil moisture monitoring system, comprising a detection rod, wherein a plurality of monitoring modules are disposed on the detection rod, the monitoring modules are connected to a processing module, and a battery is connected to the processing module, characterized in that, The detection rods are arranged in several sections, and the processing module on each detection rod is wirelessly connected to a terminal device via a communication module. The monitoring module includes a heating device and a temperature sensor. The temperature sensor monitors the rate of temperature rise in the environment. The processing module acquires the rate of temperature rise and calculates the soil moisture using a temperature rise rate-soil moisture correspondence table. The communication module transmits the soil moisture to the terminal device, which summarizes the soil moisture and outputs a soil moisture distribution map. Each detection rod includes a fixing plate, a telescopic rod, and a push rod. The monitoring modules are evenly distributed on the telescopic rod, and the push rod is fixed to the bottom end of the telescopic rod. For controlling telescopic movement, the top end of the telescopic rod is fixed to the fixed plate, and the processing module and the communication module are both installed in the control box of the fixed plate; the telescopic rod includes several nested measuring cylinders, the heating device and the temperature sensor are embedded in the outer surface of the measuring cylinders, and the wires of the heating device and the temperature sensor are connected to the processing module through the gaps between the measuring cylinders; the push rod is connected to the bottom measuring cylinder through the cavity in the middle of the measuring cylinders; the heating device includes a metal heating plate, in which heating wires are arranged, and the heating plate is arranged at least on the upper and lower sides of the temperature sensor.

2. The soil moisture monitoring system according to claim 1, characterized in that, A second temperature sensor is provided on the side of the measuring cylinder that is not equipped with the heating device, and the second temperature sensor is connected to the processing module.

3. The soil moisture monitoring system according to claim 2, characterized in that, The inner wall of the measuring cylinder is provided with a wiring groove, through which the wires of the heating device, the temperature sensor, and the second temperature sensor extend into the control box.

4. The soil moisture monitoring system according to claim 1, characterized in that, It also includes a positioning module, which is used to detect the current position of the detection rod and send it to the processing module.

5. The soil moisture monitoring system according to claim 1, characterized in that, The fixed plate is hinged to two pedals on both sides. The pedals can be rotated upwards to a vertical storage position and flipped downwards to a horizontal fixed position.

6. A method for detecting soil moisture using the soil moisture detection system according to any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1: Insert the test rods into the soil to be tested one by one to obtain the initial temperature of each layer of soil; Step 2: Start the heating device to heat each layer of soil, and the temperature sensor periodically collects the real-time temperature of the current soil layer; Step 3: The processing module obtains the initial temperature and real-time temperature, and calculates the heating rate of each soil layer based on time; Step 4: Query the heating rate-soil moisture correspondence table to obtain the soil moisture of each layer based on the heating rate; Step 5: The terminal device acquires the soil moisture of each layer collected by all the probes, summarizes and draws a soil moisture distribution map.

7. The soil moisture detection method according to claim 6, characterized in that, Obtain the geographic coordinates of each probe at each test, and draw the soil moisture distribution map based on the geographic coordinates and the soil moisture.

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