A soil pH detection device and detection method

Abstract

The application discloses a soil pH detection device and method, and belongs to the technical field of agriculture. The device comprises a base, a detection cabinet arranged on the base, a touch screen arranged on the detection cabinet, a program control unit connected to the touch screen, a software control system and a hardware driving unit of the program control unit; a screening device is arranged on one side of the detection cabinet, a moving mechanism is arranged in the detection cabinet, a first electric push rod is arranged on the moving mechanism, and a detection probe is arranged at the bottom of the first electric push rod; three calibration devices are arranged at the bottom of the detection probe, sample storage boxes and cleaning devices are arranged on the two sides of the three calibration devices; the screening device comprises a crushing cylinder, a screening groove, a coarse filter plate, a crushing mechanism, a discharge pipe and a fine filter plate, the crushing cylinder is obliquely arranged on the detection cabinet, the screening groove is arranged at the top of the crushing cylinder, the coarse filter plate is arranged at the bottom of the screening groove, the crushing mechanism and the fine filter plate are arranged in the crushing cylinder, and the calibration device comprises a solution tank and a sealing assembly. The application can improve the detection accuracy and prolong the service life of the equipment.

Description

Technical Field

[0001] This invention belongs to the field of agricultural technology and relates to soil testing, specifically to a soil pH testing device and testing method. Background Technology

[0002] Crops require a good soil environment to grow, and different crops, or even the same crop at different growth stages, have different soil requirements. Soil pH, also known as soil acidity or alkalinity, is an indicator of the strength of soil acidity or alkalinity. It is mainly determined by the concentration of hydrogen and hydroxide ions in the soil. Soil pH not only affects plant growth and development but also has a significant impact on soil fertility and microbial activity. By monitoring changes in soil pH, users can understand changes in the basic soil conditions in a timely manner, thereby ensuring that plants grow in a more ideal soil environment and achieving the goal of increasing yield and income.

[0003] Existing detection instruments typically insert probes directly into the soil for testing. Hard clods or stones in the soil can easily damage the probes, resulting in a short lifespan for the equipment. In addition, the probes of the detection equipment are not easy to clean and tend to accumulate dirt, which reduces the accuracy of the detection.

[0004] To address the aforementioned shortcomings of existing technologies, a soil pH testing device and method have been developed. Summary of the Invention

[0005] The purpose of this invention is to provide a soil pH testing device.

[0006] Another objective of this invention is to provide a method for detecting soil pH.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A soil pH testing device includes a base, a testing cabinet mounted on the base, a touch screen mounted on the testing cabinet, and a program control unit externally connected to the touch screen. The program control unit includes a software control system and a hardware driver unit, the software control system controlling the hardware driver unit to operate. The testing cabinet has a door. A screening device is installed on one side of the testing cabinet. A moving mechanism is installed inside the testing cabinet, and a first electric actuator is mounted on the moving mechanism. A testing probe is mounted at the bottom end of the first electric actuator. The testing probe moves left and right and up under the action of the moving mechanism and the first electric actuator. The device moves downwards; three calibration devices are installed at the bottom of the detection probe, and sample storage boxes and cleaning devices are respectively installed on both sides of the three calibration devices; the screening device cooperates with the sample storage box; the screening device includes a crushing cylinder, a sieving tank, a coarse filter plate, a crushing mechanism, a discharge pipe and a fine filter plate. The crushing cylinder is installed at an incline on the detection cabinet. A sieving tank is provided at the top of one end of the crushing cylinder. A coarse filter plate is installed at the bottom of the sieving tank. A crushing mechanism is installed inside the crushing cylinder. A fine filter plate is installed inside the other end of the crushing cylinder, and a discharge pipe is fitted to the outside of the crushing cylinder; the calibration device includes a solution tank and a sealing assembly.

[0008] Furthermore, the crushing mechanism includes a first motor, a rotating rod, a spiral conveying blade, and a crushing blade. The output end of the first motor is connected to the rotating rod, and the spiral conveying blade and the crushing blade are arranged on the rotating rod.

[0009] The moving mechanism includes a second motor, a lead screw, slide rails, and a slide base. The second motor is installed on the inner wall of the testing cabinet. The output end of the second motor is connected to the lead screw. Slide rails are provided on both sides of the lead screw. A slide base is sleeved on the lead screw. The slide base is slidably connected to the two slide rails, and the first electric push rod is installed on the slide base.

[0010] The cleaning device includes a cleaning cylinder, a drain pipe, a drain valve, a water injection pipe, a first connector, an air duct, a second connector, a water spray nozzle, and an air blower. The cleaning cylinder is installed at the bottom of the testing cabinet, and a drain pipe with a drain valve is installed at the bottom of the cleaning cylinder. The water injection pipe is arranged around the wall of the cleaning cylinder, and the inner wall of the cleaning cylinder surrounding the cleaning cylinder has three or more water spray nozzles evenly distributed. The water injection pipe is connected to the first connector, which is connected to a water pump supplying distilled water. The air duct is arranged around the cleaning cylinder wall above the water spray nozzles, and the inner wall of the cleaning cylinder surrounding the air duct has three or more air blower nozzles evenly distributed. The air duct is connected to the second connector, which is connected to a fan.

[0011] The water nozzles and air blowers are arranged in a ring.

[0012] The solution tank includes a tank body, a tank opening, a fixing box, and a guide groove. The tank body has a tank opening at the top, a fixing box is provided on one side of the tank opening, and a guide groove is provided inside the fixing box.

[0013] The sealing assembly includes a second electric push rod and a sealing plate. The second electric push rod is installed on the outside of the fixed box, and the telescopic end of the second electric push rod is connected to the sealing plate which is slidably connected to the guide groove.

[0014] The detection method using the soil pH testing device described above includes the following steps: S1: Soil samples taken from farmland are placed in a sieve trough, and stones in the soil samples are sieved out through a coarse filter plate. S2: The sieved soil enters the crushing cylinder and is conveyed by the crushing mechanism. After crushing, it is filtered by the fine filter plate. In conjunction with the operation of the discharge pipe, the discharge end is positioned above the sample storage box to receive soil samples that meet the requirements. S3: The moving mechanism operates, first moving the detection probe directly above the cleaning device, and then, in conjunction with the first electric push rod, inserting the detection probe into the cleaning device. The cleaning device cleans and dries the surface dust of the detection probe, maintaining its cleanliness. S4: After the detection probe is cleaned, it enters the three solution tanks in sequence with the moving mechanism and the first electric push rod. The three solution tanks contain acid and alkali calibration solutions with different pH values ​​for accuracy calibration. After each test of the corresponding calibration solution, the cleaning device needs to be cleaned to ensure calibration accuracy. S5: After the detection probe is calibrated and the soil sample is received in the sample storage box, the moving mechanism, in conjunction with the first electric actuator, performs pH testing on the soil sample in the sample storage box. S6: After a set of soil samples has been tested, the sample storage box is removed and replaced. Then, the above steps are repeated to test multiple sets of samples. After multiple tests, the data from each test is displayed on the touch screen, and the soil pH is automatically calculated by the system to complete the soil test.

[0015] The software control system controls the hardware drive unit to operate. The hardware drive unit includes a first motor, a second motor, a first electric actuator, a drain valve, a second electric actuator, and a water pump and a fan for controlling the water injection pipe and the air duct. These are electrically connected to the software control system. During operation, the first motor drives the rotating rod to rotate, which causes the spiral conveyor blade and the crushing blade to rotate synchronously. During rotation, the spiral conveyor blade transports the soil that has fallen off the screening tank to the position of the crushing blade. After the crushing blade crushes the soil, it is quickly screened out through the fine filter plate. The spiral conveyor blade not only increases the feeding speed but also works with the crushing blade to quickly crush the soil, thereby improving the crushing efficiency. This increases the processing speed of soil samples and improves the convenience of soil sample processing. The second motor drives the lead screw to rotate, allowing the slide to move along the slide rail. This moves the detection probe mounted on the telescopic end of the first electric actuator, facilitating the positioning of the detection probe. The first electric actuator also allows for adjustment of the probe's descent height. After the detection probe is inserted into the cleaning cylinder, a water pump draws distilled water into the water injection pipe, which sprays it diagonally downwards from various nozzles onto the detection probe, cleaning any adhering substances. During the cleaning process, the detection probe slowly moves upwards, and the rinsing process makes it easier and more thorough to remove adhering substances, preventing residue. As the cleaned detection probe moves to the air outlet, the fan operates, blowing air through the air duct and out of the various nozzles to clean the probe. Water droplets on the probe are blown away quickly, ensuring the probe remains dry after removal and preventing excessive moisture from affecting the pH test of the soil sample. During the cleaning process, opening the drain valve allows wastewater to drain from the drain pipe, and the combined effect of airflow helps to flush away the wastewater accumulated at the bottom, improving drainage efficiency. The extension and retraction of the second electric actuator allows the sealing plate to move back and forth in the guide groove, thereby controlling the opening and closing of the tank opening. This allows the tank opening to be opened when the probe needs calibration and closed when calibration is not required, preventing the calibration solution inside the tank from evaporating and causing pH changes. It also prevents external contamination and improves the accuracy of probe calibration.

[0016] Compared with existing technologies, the present invention can significantly improve the accuracy of detection and extend the service life of equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the internal structure of the test cabinet of the present invention.

[0019] Figure 3This is a schematic diagram of the screening device of the present invention.

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of the screening cylinder of the present invention.

[0021] Figure 5 This is a schematic diagram of the crushing mechanism of the present invention.

[0022] Figure 6 This is a schematic diagram of the moving mechanism of the present invention.

[0023] Figure 7 This is a schematic diagram of the calibration device of the present invention.

[0024] Figure 8 This is a schematic diagram of the solution tank of the present invention.

[0025] Figure 9 This is a schematic diagram of the sealing assembly of the present invention.

[0026] Figure 10 This is a schematic diagram of the cleaning device of the present invention.

[0027] Figure 11 This is a schematic diagram of the top inner wall structure of the cleaning device of the present invention.

[0028] The attached diagram is labeled as follows: 1. Base; 2. Testing cabinet; 3. Touch screen; 4. Cabinet door; 5. Screening device; 51. Crushing cylinder; 52. Screening trough; 53. Coarse filter plate; 54. Crushing mechanism; 5401. First motor; 5402. Rotating rod; 5403. Screw conveyor blade; 5404. Crushing blade; 55. Discharge pipe; 56. Fine filter plate; 6. Sample storage box; 7. Moving mechanism; 701. Second motor; 702. Lead screw; 703. Slide rail; 704. Slide seat; 8. First electric actuator; 9. Detection probe; 10. Cleaning device; 101. Cleaning cylinder; 102. Drain pipe; 103. Drain valve; 104. Water injection pipe; 105. First connector; 106. Air duct; 107. Second connector; 108. Spray nozzle; 109. Air outlet; 11. Calibration device; 111. Solution tank; 1111. Tank body; 1112. Tank opening; 1113. Fixing box; 1114. Guide groove; 112. Sealing assembly; 1121. Second electric actuator; 1122. Sealing plate. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figure 1-11 The soil pH testing device shown includes a base 1, a testing cabinet 2 mounted on the base 1, a touch screen 3 mounted on the testing cabinet 2, and a program control unit externally connected to the touch screen 3. The program control unit includes a software control system and a hardware driver unit, with the software control system controlling the hardware driver unit to operate. The testing cabinet 2 has a cabinet door 4. A screening device 5 is installed on one side of the testing cabinet 2. A moving mechanism 7 is installed inside the testing cabinet 2, with a first electric push rod 8 mounted on the moving mechanism 7. A testing probe 9 is mounted at the bottom of the first electric push rod 8. The testing probe 9 moves left and right and up and down under the action of the moving mechanism 7 and the first electric push rod 8. Three calibration devices 11 are provided at the bottom, and sample storage boxes 6 and cleaning devices 10 are respectively provided on both sides of the three calibration devices 11; the screening device 5 cooperates with the sample storage box 6; the screening device 5 includes a crushing cylinder 51, a sieving tank 52, a coarse filter plate 53, a crushing mechanism 54, a discharge pipe 55 and a fine filter plate 56. The crushing cylinder 51 is installed at an incline on the testing cabinet 2. A sieving tank 52 is provided at the top of one end of the crushing cylinder 51. A coarse filter plate 53 is installed at the bottom of the sieving tank 52. A crushing mechanism 54 is installed inside the crushing cylinder 51. A fine filter plate 56 is installed inside the other end of the crushing cylinder 51, and a discharge pipe 55 is fitted to the outside of the crushing cylinder 51; the calibration device 11 includes a solution tank 111 and a sealing assembly 112.

[0031] like Figure 3-5 The crushing mechanism 54 shown includes a first motor 5401, a rotating rod 5402, a spiral conveyor blade 5403, and a crushing blade 5404. The output end of the first motor 5401 is connected to the rotating rod 5402. The spiral conveyor blade 5403 and the crushing blade 5404 are mounted on the rotating rod 5402. During operation, the first motor 5401 drives the rotating rod 5402 to rotate, thereby causing the spiral conveyor blade 5403 and the crushing blade 5404 to rotate synchronously. During the rotation, the spiral conveyor blade 5403 conveys the soil screened from the screening trough 52 to the position of the crushing blade 5404. After the crushing blade 5404 crushes the soil, it is quickly screened out from the fine filter plate 56. The spiral conveyor blade 5403 not only improves the feeding speed but also works with the crushing blade 5404 to quickly crush the soil.

[0032] like Figure 6The moving mechanism 7 shown includes a second motor 701, a lead screw 702, a slide rail 703, and a slide block 704. The second motor 701 is installed on the inner wall of the testing cabinet 2. The output end of the second motor 701 is connected to the lead screw 702. Slide rails 703 are provided on both sides of the lead screw 702. The slide block 704 is sleeved on the lead screw 702. The slide block 704 is slidably connected to the two slide rails 703, and the first electric push rod 8 is installed on the slide block 704. The operation of the second motor 701 drives the lead screw 702 to rotate, thereby enabling the slide block 704 to move along the slide rails 703. This causes the testing probe 9 installed on the telescopic end of the first electric push rod 8 to move accordingly, so as to move and position the testing probe 9. The descent height of the testing probe 8 can be adjusted by the telescopic extension of the first electric push rod 8.

[0033] like Figure 10 , 11 The cleaning device 10 shown includes a cleaning cylinder 101, a drain pipe 102, a drain valve 103, a water injection pipe 104, a first connector 105, an air duct 106, a second connector 107, a water spray nozzle 108, and an air blower 109. The cleaning cylinder 101 is installed at the bottom of the inside of the testing cabinet 2. The bottom of the cleaning cylinder 101 has a drain pipe 102, and a drain valve 103 is installed on the drain pipe 102. The water injection pipe 104 is arranged around the wall of the cleaning cylinder 101. The inner wall of the cleaning tank 101, which is surrounded by a cleaning cylinder 101, is evenly provided with three or more water spray nozzles 108. The water injection pipe 104 is connected to a first connector 105, which is connected to a water pump supplying distilled water. The air guide pipe 106 is arranged around the wall of the cleaning tank 101 above the water spray nozzles 108. The inner wall of the cleaning tank 101 with the air guide pipe 106 is evenly provided with three or more air blowing nozzles 109. The air guide pipe 106 is connected to a second connector 109. 07. The second connector 107 is connected to a blower. The water spray nozzles 108 and air blowers 109 are arranged in a ring with their openings facing downwards. After the detection probe 9 is inserted into the cleaning cylinder 101, the water pump draws distilled water into the water injection pipe 104 and sprays it obliquely downwards from each water spray nozzle 108 onto the detection probe 9 to clean the deposits on the detection probe 9. During the cleaning process, the detection probe 9 moves slowly upwards, and the rinsing makes it easier to clean the deposits and ensures thorough cleaning, avoiding any residue. As the detection probe 9 moves to the air blower 109, the blower runs, blowing air through the air duct 106 and blowing it out from each air blower to remove the water droplets on the detection probe 9. This ensures that the attached water droplets are quickly blown away, keeping the detection probe 9 dry after it is removed, and preventing excessive moisture from affecting the pH test of the soil sample. During the cleaning process, opening the drain valve 103 allows the wastewater to be discharged from the drain pipe 102.

[0034] like Figure 7-9The solution tank 111 shown includes a tank body 1111, a tank opening 1112, a fixing box 1113, and a guide groove 1114. The tank body 1111 has a tank opening 1112 at its top. A fixing box 1113 is provided on one side of the tank opening 1112. A guide groove 1114 is provided inside the fixing box 1113. The sealing assembly 112 includes a second electric actuator 1121 and a sealing plate 1122. The second electric actuator 1121 is installed on the outside of the fixing box 1113. The telescopic end of the second electric actuator 1121 is connected to the sealing plate 1122, which is slidably connected to the guide groove 1114. By extending and retracting the second electric actuator, the sealing plate can move back and forth in the guide groove, thereby controlling the opening and closing of the tank opening. This allows the tank opening to be opened when the detection probe needs to be calibrated, and the tank opening to be closed when the detection probe does not need to be calibrated.

[0035] During use, the three solution containers 111 contain calibration solutions with pH values ​​of 4.0, 7.0, and 10.0, respectively. The specific testing method includes the following steps: Soil samples taken from farmland are placed in a sieve trough 52, and stones in the soil samples are sieved out through a coarse filter plate 53. After screening, the soil enters the crushing cylinder 51 and is conveyed and crushed by the crushing mechanism 54. After crushing, it is filtered by the fine filter plate 56. In conjunction with the operation of the discharge pipe 55, the discharge end is positioned above the sample storage box 6 to receive soil samples that meet the requirements. The moving mechanism 7 operates, first moving the detection probe 9 directly above the cleaning device 10, and then, in conjunction with the first electric push rod 8, inserting the detection probe 9 into the cleaning device 10. The cleaning device 10 cleans and dries the surface dust of the detection probe 9, maintaining the cleanliness of the detection probe 9. After the detection probe 9 is cleaned, it enters the three solution tanks 111 in sequence with the moving mechanism 7 and the first electric push rod 8. The three solution tanks 111 contain calibration solutions with pH values ​​of 4.0, 7.0 and 10.0 respectively for accuracy calibration. After each test of the corresponding calibration solution, the cleaning device 10 needs to clean it to ensure calibration accuracy. After the calibration of the detection probe 9 and the receipt of soil samples in the sample storage box 6 are completed, the moving mechanism 7, in conjunction with the first electric push rod 8, performs pH testing on the soil samples in the sample storage box 6. After a set of soil samples is tested, the sample storage box 6 is removed and replaced. Then the above steps are repeated to test multiple sets of samples. After multiple tests, the data of each test is displayed on the touch screen 3, and the soil pH is automatically calculated by the system to complete the soil test.

[0036] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A soil pH testing device, comprising a base (1), a testing cabinet (2) mounted on the base (1), a touch screen (3) mounted on the testing cabinet (2), a program control unit externally connected to the touch screen (3), the program control unit comprising a software control system and a hardware drive unit, wherein the software control system controls the hardware drive unit to operate, and a cabinet door (4) is provided on the testing cabinet (2); characterized in that, A screening device (5) is installed on one side of the testing cabinet (2); a moving mechanism (7) is installed inside the testing cabinet (2), a first electric push rod (8) is installed on the moving mechanism (7), and a testing probe (9) is installed at the bottom of the first electric push rod (8). The testing probe (9) moves left and right and up and down under the action of the moving mechanism (7) and the first electric push rod (8). The bottom of the detection probe (9) is equipped with three calibration devices (11), and the two sides of the three calibration devices (11) are respectively equipped with a sample storage box (6) and a cleaning device (10); the screening device (5) is equipped with the sample storage box (6); The screening device (5) includes a crushing cylinder (51), a screening trough (52), a coarse filter plate (53), a crushing mechanism (54), a discharge pipe (55), and a fine filter plate (56). The crushing cylinder (51) is installed at an incline on the testing cabinet (2). A screening trough (52) is provided at the top of one end of the crushing cylinder (51). A coarse filter plate (53) is installed at the bottom of the screening trough (52). A crushing mechanism (54) is installed inside the crushing cylinder (51). A fine filter plate (56) is installed inside the other end of the crushing cylinder (51). A discharge pipe (55) is fitted around the outside of the crushing cylinder (51). The crushing mechanism (54) includes a first motor (5401), a rotating rod (5402), a spiral conveying blade (5403), and a crushing knife (5404). The output end of the first motor (5401) is connected to the rotating rod (5402). A spiral conveying blade (5403) and a crushing knife (5404) are provided on the rotating rod (5402). The cleaning device (10) includes a cleaning cylinder (101), a drain pipe (102), a drain valve (103), a water injection pipe (104), a first connector (105), a duct pipe (106), a second connector (107), a water spray nozzle (108), and an air blower (109). The cleaning cylinder (101) is installed at the bottom of the testing cabinet (2). A drain pipe (102) is provided at the bottom of the cleaning cylinder (101), and a drain valve (103) is installed on the drain pipe (102). The water injection pipe (104) is arranged around the wall of the cleaning cylinder (101), and more than three water spray nozzles (108) are evenly provided on the inner wall of the cleaning cylinder (101) surrounding the cleaning cylinder (101). The water injection pipe (104) is connected to the first connector (105), and the first connector (105) is connected to a water pump that supplies distilled water; the air guide pipe (106) is arranged around the wall of the cleaning cylinder (101) above the water spray nozzle (108), and the inner wall of the cleaning cylinder (101) with the air guide pipe (106) is evenly provided with more than 3 air outlets (109); the air guide pipe (106) is connected to the second connector (107), and the second connector (107) is connected to a fan; The calibration device (11) includes a solution tank (111) and a sealing assembly (112). The solution tank (111) includes a tank body (1111), a tank opening (1112), a fixing box (1113), and a guide groove (1114). The tank body (1111) has a tank opening (1112) at the top. A fixing box (1113) is provided on one side of the tank opening (1112). A guide groove (1114) is provided inside the fixing box (1113). The sealing assembly (112) includes a second electric push rod (1121) and a sealing plate (1122). The second electric push rod (1121) is installed on the outside of the fixing box (1113). The telescopic end of the second electric push rod (1121) is connected to the sealing plate (1122) which is slidably connected to the guide groove (1114).

2. The soil pH testing device according to claim 1, characterized in that, The moving mechanism (7) includes a second motor (701), a lead screw (702), a slide rail (703), and a slide base (704). The second motor (701) is installed on the inner wall of the testing cabinet (2). The output end of the second motor (701) is connected to the lead screw (702). Slide rails (703) are provided on both sides of the lead screw (702). A slide base (704) is sleeved on the lead screw (702). The slide base (704) is slidably connected to the two slide rails (703), and the first electric push rod (8) is installed on the slide base (704).

3. The soil pH testing device according to claim 1, characterized in that, The water nozzles (108) and air nozzles (109) are arranged in a ring.

4. A method for detecting soil pH using the apparatus described in any one of claims 1-3, characterized in that, Includes the following steps: 1) Place the soil sample into the sieve trough (52), sieve it through the coarse filter plate (53), and then the sieved soil enters the crushing cylinder (51) and is conveyed and crushed by the crushing mechanism (54). After crushing, it is filtered by the fine filter plate (56) and fed into the sample storage box (6) through the discharge pipe (55). 2) The moving mechanism (7) operates, first moving the detection probe (9) directly above the cleaning device (10), and the first electric push rod (8) inserts the detection probe (9) into the cleaning device (10) for cleaning and drying; 3) After the detection probe (9) is cleaned, it is moved into the three solution tanks (111) in sequence with the moving mechanism (7) and the first electric push rod (8). The three solution tanks (111) contain calibration solutions with different pH values ​​respectively for accuracy calibration. Each time the corresponding calibration solution is tested, the cleaning device (10) is required to clean it to ensure the calibration accuracy. 4) The detection probe (9) is sent into the sample storage box (6) by the action of the moving mechanism (7) and the first electric push rod (8) to detect the acidity and alkalinity of the soil sample; 5) After a set of soil samples is tested, the sample storage box (6) is taken out and replaced. Then the above steps are repeated to test multiple sets of samples. After multiple tests, the data of each test is displayed on the touch screen (3), and the soil pH is automatically calculated by the system to complete the soil test.

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