A saline-alkali soil rainwater collection, irrigation and fertilization integrated system

Abstract

The application relates to a saline-alkali soil rainwater collection, irrigation and fertilization integrated system, belonging to the technical field of saline-alkali soil planting, which comprises a drip irrigation pipe and a fertilization pool, the drip irrigation pipe is laid on the saline-alkali soil and one end of the drip irrigation pipe is inserted into the fertilization pool, further comprising a water collecting pipe and a collection tank, the water collecting pipe and the collection tank are both buried underground of the saline-alkali soil, and the collection tank is located below the water collecting pipe; the collection tank is connected with a water inlet pipe and a water outlet pipe, one end of the water inlet pipe far from the collection tank is communicated with the water collecting pipe, and one end of the water outlet pipe far from the collection tank is communicated with the inside of the fertilization pool; the water collecting pipe is laid along the horizontal direction, a plurality of water permeable holes are arranged on the top of the water collecting pipe, and the water permeable holes are arranged at intervals along the length direction of the water collecting pipe; a first pressure pump and an open-close valve are arranged on the water outlet pipe, and a second pressure pump is arranged on the drip irrigation pipe, the application has the effects of recycling the precipitation resources and realizing the integration of the saline-alkali soil rainwater accumulation, irrigation and fertilization.

Description

Technical Field

[0001] This application relates to the technical field of planting on saline-alkali land, and in particular to an integrated system for rainwater harvesting, irrigation, and fertilization of saline-alkali land. Background Technology

[0002] Severely saline-alkali land refers to soil types with very high salt and alkali content, which severely inhibits plant growth. Soil salinization refers to the process by which salts from the subsoil or groundwater rise to the surface via capillary action, and then accumulate in the topsoil after water evaporation. When the soil salinity reaches a severe level, most crops will struggle to grow normally or even fail to grow at all. Electrical conductivity is an important indicator of soil salinity; a value greater than 16 dS / m is generally considered severely saline-alkali land.

[0003] Compared to traditional flood irrigation, drip irrigation provides precise water supply, avoiding the situation where large amounts of irrigation water flow across the ground and carry large amounts of underground salts to the surface. In severely saline-alkali land, where salt mainly accumulates in the topsoil, drip irrigation only wets the local soil around the crop roots, diluting the salt concentration in this area and creating a favorable soil environment for vegetation growth.

[0004] During the rainy season, rainwater seeps into the ground, which is essentially flood irrigation, resulting in a waste of rainwater resources and easily leading to soil salinization. Summary of the Invention

[0005] To improve the utilization rate of natural precipitation and achieve integrated rainwater harvesting, irrigation, and fertilization, this application provides an integrated rainwater harvesting, irrigation, and fertilization system for saline-alkali land. This system effectively improves the utilization rate of natural precipitation and prevents soil salinization by recycling natural precipitation and using freshwater for drip irrigation.

[0006] The integrated rainwater harvesting, irrigation, and fertilization system for saline-alkali land provided in this application adopts the following technical solution: An integrated system for rainwater harvesting, irrigation, and fertilization in saline-alkali land includes drip irrigation pipes and a fertilization tank. The drip irrigation pipes are laid on the saline-alkali land with one end extending into the fertilization tank. The system also includes a water collection pipe and a storage tank, both buried underground in the saline-alkali land, with the storage tank located below the water collection pipe. The storage tank is connected to an inlet pipe and an outlet pipe. The inlet pipe, at its end furthest from the storage tank, connects to the water collection pipe, and the outlet pipe, at its end furthest from the storage tank, connects to the interior of the fertilization tank. The water collection pipe is laid horizontally, with multiple permeable holes at intervals along its length. The outlet pipe is equipped with a first pressure pump and an on / off valve, and the drip irrigation pipe is equipped with a second pressure pump.

[0007] By adopting the above technical solution, rainwater infiltrates through permeable holes into the collection pipe, and then flows into the storage tank through the inlet pipe. The flow process utilizes the pressure difference between the inside and outside of the storage tank. In severely saline-alkali land, at the beginning of rainfall, the soil, due to its long-term saline-alkali state, contains a high concentration of salt and alkali components in its pores. When rainwater begins to infiltrate, the gaps between soil particles are filled by the rainwater. Because the soil structure of saline-alkali land is relatively compact, the infiltration rate of rainwater is relatively slow. At this time, the water pressure in the soil outside the storage tank and collection pipe gradually increases. Due to the accumulation of rainwater and the poor permeability of the soil, a high water pressure area is formed. Rainwater is collected in the storage tank. When irrigation is needed, the first pressure pump, in conjunction with the outlet pipe, pumps the collected rainwater from the storage tank to the fertilizer mixing tank. Fertilizer is added in the fertilizer mixing tank, and then the second pressure pump and drip irrigation pipes are used for precise drip irrigation of the vegetation, thereby improving the utilization rate of natural precipitation and achieving the integrated effect of rainwater collection, irrigation, and fertilization.

[0008] Optionally, a one-way valve is installed on the water inlet pipe.

[0009] By adopting the above technical solution, the water pressure inside the storage tank will rise rapidly as rainwater flows in. Once the internal water level reaches a certain height, the rate of increase in internal water pressure will gradually balance with the rate of increase in external water pressure. This is because the inflow rate of the storage tank and the infiltration rate of the external soil reach a dynamic equilibrium to a certain extent. The presence of a one-way valve prevents rainwater inside the storage tank from flowing back to the outside.

[0010] Optionally, both the inlet and outlet pipes are vertically arranged, and the storage tank is equipped with a pressurizing mechanism. The pressurizing mechanism includes a partition plate, a motor, a drive pipe, and a start / stop button. The partition plate is located inside the storage tank, and its outer circumferential wall slides against the inner wall of the storage tank. The drive pipe, inlet pipe, and outlet pipe all pass through the partition plate. The drive pipe is vertically arranged and threadedly connected to the partition plate. The inlet and outlet pipes are slidably connected to the partition plate. The motor is used to provide power for the rotation of the drive pipe, and the start / stop button is used to control the start and stop of the motor.

[0011] By adopting the above technical solution, both the inlet and outlet pipes are vertically installed and pass through the partition plate, which serves to limit the partition plate and restrict its horizontal rotation. The motor drives the drive pipe to rotate, and the drive pipe is threadedly connected to the partition plate. Eventually, the partition plate begins to move upward, and the pressure below the partition plate decreases, causing the water pressure inside and outside the storage tank to become unbalanced again. Rainwater outside the storage tank can then collect back into the storage tank, improving the utilization rate of the internal space of the storage tank.

[0012] Optionally, a pressing assembly is provided between the motor and the drive tube. The pressing assembly includes a positioning tube, a vertical rod, a cage gear, a special-shaped gear ring, a spur gear, and a spur gear ring. The positioning tube is vertically arranged with its top end extending out of the ground. The bottom end of the positioning tube passes through the storage tank and is rotatably connected to the top of the drive tube. The drive tube rotates relative to the positioning tube. The center lines of the vertical rod, the drive tube, and the positioning tube are collinear. The top end of the vertical rod extends out of the top end of the positioning tube. The bottom end of the vertical rod passes through the positioning tube and extends into the drive tube, where it is fixed to the cage gear. The special-shaped gear ring is fixed on the inner wall of the drive tube for meshing with the cage gear. The spur gear ring is fixed in the area where the vertical rod extends out of the top end of the positioning tube. The spur gear is fixed to the output end of the motor and meshes with the spur gear ring.

[0013] By adopting the above technical solution, the setting of the pressure component makes the state of starting the motor and thus driving the tube to rotate controllable. Only when the special-shaped gear ring meshes with the cage gear can the starting motor make the drive tube rotate. The motor drives the vertical rod to rotate through the spur gear and the spur gear ring, and the vertical rod drives the drive rod to rotate through the special-shaped gear ring and the cage gear ring.

[0014] Optionally, a spring is looped around the vertical rod, with the top end of the spring fixed to the bottom surface of the spur gear ring and the bottom end of the spring fixed to the top end of the positioning tube; a pedal is fixed to the top end of the vertical rod, with the bottom surface of the pedal used to press down the start / stop button, and the vertical rod is slidably arranged relative to the positioning tube and the drive tube in the vertical direction.

[0015] By adopting the above technical solution, pressing down on the pedal moves the vertical rod downwards, compressing the spring. This engages the cage gear with the special-shaped gear ring. Pressing down the start / stop button on the bottom of the pedal starts the motor, causing the drive tube to rotate. After the operator's foot leaves the pedal, the spring moves the vertical rod upwards, stopping the motor.

[0016] Optionally, the circumferential edge of the cage gear slides against the inner wall of the drive tube, and a notch is provided on the cage gear for the irregular gear ring to pass through the cage gear in the vertical direction.

[0017] By adopting the above technical solution, the circumferential edge of the cage gear slides against the inner wall of the drive tube, thereby limiting the position of the vertical rod inside the drive tube and the positioning tube, ensuring the stability of the vertical rod's position. The notch provides a disengagement channel for the cage gear to detach from the irregular gear ring.

[0018] Optionally, a pad is fixed on the positioning tube, the top of the positioning tube passes through the pad, the pad is fixed on the ground of the saline-alkali land, and the motor and start / stop button are both fixed on the pad.

[0019] By adopting the above technical solution, the pad provides an installation position for the motor and start / stop button, avoiding the dampness or rainwater of the saline-alkali surface.

[0020] Optionally, a left shell and a right shell are slidably disposed on the pad, and the left shell and the right shell slide in a direction that approaches or moves away from each other; after the edges of the left shell and the right shell approach each other, they form a covered space, and the motor, start / stop button and spur gear are all located between the left shell and the right shell.

[0021] By adopting the above technical solution, the arrangement of the left and right shells creates a protective space for the motor, start / stop button, and spur gear ring, preventing rainwater erosion.

[0022] Optionally, the edges of the left and right shells that are close to each other are magnetically attracted.

[0023] By adopting the above technical solution, magnetic adsorption makes it easier to merge or separate the left and right shells.

[0024] Optionally, when the pedal is pressed down to start / stop the button, the left and right shells move toward each other until they form an abutment area with the top edge of the pedal to limit the pedal from moving upward.

[0025] By adopting the above technical solution, when the operator starts the motor by pressing the pedal, if the operator wants to temporarily leave the pedal, the left and right shells can be slid to vertically limit the top of the pedal, thus keeping the pedal pressed down on the start / stop button.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. Rainwater is collected in a storage tank. When irrigation is needed, the first pressure pump, together with the outlet pipe, draws the collected rainwater from the storage tank to the fertilizer mixing tank. Fertilizer is added to the fertilizer mixing tank, and then the second pressure pump and drip irrigation pipe are used to precisely drip the water onto the vegetation, thereby improving the utilization rate of natural precipitation and achieving the integrated effect of rainwater collection, irrigation and fertilization. 2. The setting of the pressure component makes the state of starting the motor and thus driving the tube to rotate controllable. The starting motor can only make the drive tube rotate when the special-shaped gear ring meshes with the cage gear. 3. When the operator starts the motor by pressing the pedal, if the operator wants to temporarily leave the pedal, the left and right shells can be slid to vertically limit the top of the pedal, keeping the pedal pressed down on the start / stop button. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a schematic diagram showing the location of the permeable holes; Figure 3 This is a partial structural cross-sectional view showing the location of the motor and the internal structure of the storage tank; Figure 4 yes Figure 3A magnified view of part A in the diagram.

[0028] In the diagram: 1. Storage tank; 11. Inlet pipe; 111. Check valve; 12. Outlet pipe; 121. First pressure pump; 122. On / off valve; 2. Water collection pipe; 21. Water permeable hole; 3. Fertilizer tank; 4. Drip irrigation pipe; 41. Second pressure pump; 5. Pressurization mechanism; 51. Partition plate; 52. Motor; 53. Drive pipe; 54. Start / stop button; 6. Downward pressing assembly; 61. Positioning pipe; 62. Vertical rod; 621. Spring; 622. Pedal; 63. Cage gear; 631. Notch; 64. Special-shaped gear ring; 65. Spur gear; 66. Spur gear ring; 7. Pad; 71. Left shell; 72. Right shell. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0030] This application discloses an integrated system for rainwater harvesting, irrigation, and fertilization in saline-alkali land.

[0031] refer to Figure 1 A rainwater harvesting, irrigation, and fertilization system for saline-alkali land includes a rainwater collection tank 1, a water collection pipe 2, a drip irrigation pipe 4, and a fertilization pond 3. Both the rainwater collection tank 1 and the water collection pipe 2 are buried underground in the saline-alkali land, while the drip irrigation pipe 4 and the fertilization pond 3 are located on the surface of the saline-alkali land. The rainwater collection tank 1 is equipped with an inlet pipe 11 and an outlet pipe 12, both vertically arranged. The water collection pipe 2 is located above the rainwater collection tank 1. The top end of the inlet pipe 11 connects to the interior of the water collection pipe 2, and the bottom end of the inlet pipe 1 extends into the interior of the rainwater collection tank 1, near its bottom. The bottom end of the outlet pipe 12 extends into the interior of the rainwater collection tank 1, near its bottom, and the top end of the outlet pipe 12 connects to the interior of the fertilization pond 3. The outlet pipe 12 is equipped with a first pressure pump 121 and an on / off valve 122. One end of the drip irrigation pipe 4 extends into the fertilization tank 3, and a second pressure pump 41 is installed on the drip irrigation pipe 4.

[0032] refer to Figure 1 and Figure 2 The water collection pipe 2 has multiple water permeable holes 21, which are located at the top of the water collection pipe 2 and are spaced apart from each other along the length of the water collection pipe 2. The inlet pipe 11 is equipped with a one-way valve 111, which only allows rainwater to flow into the storage tank 1.

[0033] refer to Figure 2 and Figure 3Rainwater seeps into the saline-alkali land, enters the water collection pipe 2 through the permeable hole 21, and then enters the storage tank 1 through the inlet pipe 11. When drip irrigation is needed for the vegetation, the open / close valve 122 is turned on, and the first pressure pump 121, together with the outlet pipe 12, pumps the rainwater in the storage tank 1 into the fertilization pond 3. After adding the corresponding fertilizer to the fertilization pond 3, the second pressure pump 41, together with the drip irrigation pipe 4, pumps the liquid in the fertilization pond 3 and drips it onto the corresponding vegetation.

[0034] refer to Figure 2 and Figure 3 The storage tank 1 is equipped with a pressurization mechanism 5. After the pressure inside and outside the storage tank 1 is balanced, the pressurization mechanism 5 is activated to change the internal pressure of the storage tank 1, so that the rainwater outside the storage tank 1 continues to flow into the storage tank 1.

[0035] refer to Figure 2 , Figure 3 and Figure 4 The pressurizing mechanism 5 includes a partition plate 51, a motor 52, a drive pipe 53, and a start / stop button 54. A pressing assembly 6 is provided between the motor 52 and the drive pipe 53. The pressing assembly 6 includes a positioning pipe 61, a vertical rod 62, a cage gear 63, a special-shaped gear ring 64, a spur gear 65, and a spur gear ring 66. The vertical rod 62, the drive pipe 53, and the positioning pipe 61 are all vertically arranged and their center lines are collinear. The positioning pipe 61 is located above the drive pipe 53. The drive pipe 53 is rotatably installed inside the storage tank 1. The positioning pipe 61 is fixed to the saline-alkali land. The bottom end of the positioning pipe 61 passes through the top of the storage tank 1 and is rotatably connected to the drive pipe 53. The rotation axis of the drive pipe 53 is its own vertical center axis. The top end of the positioning pipe 61 extends out of the saline-alkali land surface. A pad 7 is provided on the positioning pipe 61, and the top end of the positioning pipe 61 passes through the pad 7. The pad 7 is fixed to the saline-alkali land surface. Both ends of the drive pipe 53 and the positioning pipe 61 are closed.

[0036] refer to Figure 2 and Figure 3 The partition plate 51 is located inside the storage tank 1, and its outer circumferential wall slides against the inner wall of the storage tank 1. The partition plate 51 slides vertically relative to the storage tank 1. The drive pipe 53, the inlet pipe 11, and the outlet pipe 12 all pass through the partition plate 51. The drive pipe 53 is threadedly connected to the partition plate 51, and the inlet pipe 11 and the outlet pipe 12 are slidably connected to the partition plate 51.

[0037] refer to Figure 2 and Figure 3The motor 52 and start / stop button 54 are both fixed to the top of the pad 7, and the output end of the motor 52 is fixedly connected to the spur gear 65. The top of the vertical rod 62 extends out of the top of the positioning tube 61, and a pedal 622 is fixed to the top of the vertical rod 62. A spur gear ring 66 is fixedly sleeved on the outer wall of the vertical rod 62, and the spur gear ring 66 is located between the pedal 622 and the top of the positioning tube 61. The spur gear ring 66 meshes with the spur gear 65. A spring 621 is sleeved on the vertical rod 62. The top of the spring 621 is fixedly connected to the bottom surface of the spur gear ring 66, and the bottom of the spring 621 is fixedly connected to the top end face of the positioning tube 61. The vertical rod 62 is slidably arranged relative to the positioning tube 61 and the drive tube 53 in the vertical direction. The sliding distance of the vertical rod 62 does not exceed the vertical thickness of the spur gear ring 66, that is, the spur gear ring 66 and the spur gear 65 are always in a meshing state during the sliding of the vertical rod 62.

[0038] refer to Figure 3 and Figure 4 The bottom end of the vertical rod 62 is fixedly connected to the cage gear 63, and the circumferential sidewall of the cage gear 63 slides against the inner wall of the drive tube 53. A notch 631 is provided on the cage gear 63, which extends from the edge of the cage gear 63 towards the center. The irregular gear ring 64 is fixed on the inner wall of the drive tube 53. When the vertical rod 62 drives the cage gear 63 to move in the vertical direction, the irregular gear ring 64 engages or disengages with the cage gear 63 through the notch 631.

[0039] refer to Figure 3 A left shell 71 and a right shell 72 are slidably mounted on the pad 7, located on both sides of the vertical rod 62. The left shell 71 and right shell 72 move in directions that bring them closer together or further apart. The edges of the left shell 71 and right shell 72 that are close together are made of magnetic material; that is, the edge of the left shell 71 has anode magnetism, and the edge of the right shell 72 has cathode magnetism. When the edges of the left shell 71 and right shell 72 come into contact, they are in a magnetic adsorption state. In the natural state, the space formed by the contact of the edges of the left shell 71 and right shell 72 encloses the motor 52, spur gear 65, spur gear ring 66, start / stop button 54, and spring 621. At this time, the tops of the left shell 71 and right shell 72 are located between the pedal 622 and the top of the spur gear ring 66.

[0040] refer to Figure 3 and Figure 4 When the spring 621 is compressed, the operator presses down on the pedal 622, the cage gear 63 meshes with the special-shaped gear ring 64, and the start / stop button 54 is pressed down on the bottom surface of the pedal 622. At this time, the motor 52 starts, and after the edges of the left shell 71 and the right shell 72 come into contact with each other, the tops of the left shell 71 and the right shell 72 come into contact with the top surface of the pedal 622, restricting the pedal 622 from moving upward.

[0041] refer to Figure 2The sliding methods of the left shell 71 and the right shell 72 on the pad 7 are not unique. They can be achieved by a combination of groove and slider, or by a slide rail. No further examples will be given.

[0042] The implementation principle of the integrated rainwater harvesting, irrigation, and fertilization system for saline-alkali land in this application embodiment is as follows: Rainwater infiltrates into the saline-alkali land, enters the collection pipe 2 through the permeable hole 21, and then enters the collection tank 1 through the inlet pipe 11 until the pressure inside and outside the collection tank 1 is balanced. Then, the motor 52 is started, the pedal 622 is pressed, and the position of the partition plate 51 is changed, causing the previously balanced water pressure inside and outside the collection tank 1 to become unbalanced again, allowing rainwater outside the collection tank 1 to collect back into the collection tank 1. When drip irrigation of vegetation is needed, the open / close valve 122 is turned, and the first pressure pump 121, in conjunction with the outlet pipe 12, pumps the rainwater in the collection tank 1 into the fertilization tank 3. After adding the corresponding fertilizer to the fertilization tank 3, the second pressure pump 41, in conjunction with the drip irrigation pipe 4, pumps the liquid from the fertilization tank 3 and drips it onto the corresponding vegetation, thereby improving the utilization rate of natural precipitation and achieving the integrated effect of rainwater harvesting, irrigation, and fertilization.

[0043] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rainwater harvesting, irrigation, and fertilization system for saline-alkali land, comprising a drip irrigation pipe (4) and a fertilization pond (3), wherein the drip irrigation pipe (4) is laid on the saline-alkali land and one end extends into the fertilization pond, characterized in that: It also includes a water collection pipe (2) and a storage tank (1), both of which are buried underground in the saline-alkali land. The storage tank (1) is located below the water collection pipe (2). The storage tank (1) is connected to an inlet pipe (11) and an outlet pipe (12). The end of the inlet pipe (11) away from the storage tank (1) is connected to the water collection pipe (2), and the end of the outlet pipe (12) away from the storage tank (1) is connected to the inside of the fertilization tank. The water collection pipe (2) is laid horizontally, and multiple permeable holes (21) are opened at the top of the water collection pipe (2). The permeable holes (21) are spaced apart along the length of the water collection pipe (2). The outlet pipe (12) is equipped with a first pressure. The pump (121) and the on / off valve (122) are provided. A second pressure pump (41) is provided on the drip irrigation pipe (4). The inlet pipe (11) and the outlet pipe (12) are both vertically arranged. A pressurizing mechanism (5) is provided on the storage tank (1). The pressurizing mechanism (5) includes a partition plate (51), a motor (52), a drive pipe (53), and a start / stop button (54). The partition plate (51) is located inside the storage tank (1) and its outer circumferential wall slides against the inner wall of the storage tank (1). The drive pipe (53), the inlet pipe (11), and the outlet pipe (12) all pass through the partition plate (51). The drive pipe (53) is vertically arranged and threadedly connected to the partition plate (51). The inlet pipe (11) and outlet pipe (12) are slidably connected to the partition plate (51). The motor (52) is used to provide power for the rotation of the drive pipe (53). The start / stop button (54) is used to control the start and stop of the motor (52). A pressing assembly (6) is provided between the motor (52) and the drive pipe (53). The pressing assembly (6) includes a positioning pipe (61), a vertical rod (62), a cage gear (63), a special-shaped gear ring (64), a spur gear (65), and a spur gear ring (66). The positioning pipe (61) is vertically set and its top extends out of the ground. The bottom end of the positioning pipe (61) is inserted into the storage tank (1) and rotatably connected to the top of the drive pipe (53). The moving tube (53) rotates relative to the positioning tube (61). The center lines of the vertical rod (62), the driving tube (53), and the positioning tube (61) are collinear. The top of the vertical rod (62) extends out of the top of the positioning tube (61). The bottom of the vertical rod (62) penetrates the positioning tube (61) and extends into the driving tube (53) to be fixed with the cage gear (63). The special-shaped gear ring (64) is fixed on the inner wall of the driving tube (53) for meshing with the cage gear (63). The spur gear ring (66) is fixed in the area where the vertical rod (62) extends out of the top of the positioning tube (61). The spur gear (65) is fixed to the output end of the motor (52). The spur gear (65) meshes with the spur gear ring (66).

2. The integrated system for rainwater harvesting, irrigation, and fertilization of saline-alkali land according to claim 1, characterized in that: A one-way valve (111) is installed on the water inlet pipe (11).

3. The integrated system for rainwater harvesting, irrigation, and fertilization of saline-alkali land according to claim 1, characterized in that: A spring (621) is looped around the vertical rod (62). The top of the spring (621) is fixed to the bottom surface of the straight toothed ring (66), and the bottom of the spring (621) is fixed to the top of the positioning tube (61). A pedal (622) is fixed to the top of the vertical rod (62). The bottom surface of the pedal (622) is used to press down the start / stop button (54). The vertical rod (62) slides vertically relative to the positioning tube (61) and the drive tube (53).

4. The integrated system for rainwater harvesting, irrigation, and fertilization of saline-alkali land according to claim 3, characterized in that: The circumferential edge of the cage gear (63) slides against the inner wall of the drive tube (53), and a notch (631) is provided on the cage gear (63) for the irregular gear ring (64) to pass through the cage gear (63) in the vertical direction.

5. The integrated system for rainwater harvesting, irrigation, and fertilization of saline-alkali land according to claim 3, characterized in that: A pad (7) is fixed on the positioning tube (61), and the top of the positioning tube (61) passes through the pad (7). The pad (7) is fixed on the ground of the saline-alkali land. The motor (52) and the start / stop button (54) are both fixed on the pad (7).

6. The integrated system for rainwater harvesting, irrigation, and fertilization of saline-alkali land according to claim 5, characterized in that: The pad (7) has a left shell (71) and a right shell (72) slidably disposed on it. The left shell (71) and the right shell (72) slide in a direction that is close to or far away from each other. After the edges of the left shell (71) and the right shell (72) come together, they form a covered space. The motor (52), the start / stop button (54) and the spur gear (66) are all located between the left shell (71) and the right shell (72).

7. The integrated system for rainwater harvesting, irrigation, and fertilization of saline-alkali land according to claim 6, characterized in that: The left shell (71) and right shell (72) are magnetically attracted to each other at their edges.

8. The integrated system for rainwater harvesting, irrigation, and fertilization of saline-alkali land according to claim 6, characterized in that: When the pedal (622) presses down the start / stop button (54), the left shell (71) and the right shell (72) move toward each other until they form an abutment area with the top edge of the pedal (622) to limit the pedal (622) from moving upward.

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