Aquatic plant growing device for closed loop rice field cultivation

Abstract

The utility model provides a water plant planting device for closed loop type rice field planting, including planting frame for fitting canal wall, a plurality of planting cups are detachably arranged on the planting frame, the planting cup includes casing, the inside of casing is provided with planting cavity for containing water plant and soil, and the casing is provided with opening communicated to planting cavity, the utility model fixes the planting cup on the planting frame after concentration, realizes the controllable position of water plant in ecological restoration canal, simultaneously, still allows according to the difference of nitrogen and phosphorus content of water body in different stages of rice growth in closed loop flow to adjust the quantity of planting cup and increase or reduce, thereby controls the total amount of water plant, realizes better water purification and water management.

Description

Technical Field

[0001] This utility model relates to the technical field of water management equipment for paddy field planting, specifically to an aquatic plant planting device for closed-loop paddy field planting. Background Technology

[0002] As the old saying goes, "Water is the lifeblood of rice, but also its disease," highlighting the crucial role of water management in rice cultivation. Currently, traditional methods of long-term flooding and intermittent irrigation are gradually being replaced by standardized models, resulting in grid-based irrigation and shallow-moist control irrigation techniques. For example, a 3-cm shallow water layer is maintained during the tillering stage, and field drying is implemented at the end of the tillering period based on seedling condition. Another example is maintaining a 3-5 cm water layer during the young panicle stage, and using intermittent moist irrigation during the grain-filling stage.

[0003] Existing paddy field irrigation methods can effectively regulate water level at different stages of rice growth. However, for water conservation purposes, the overall irrigation strategy employs a combination of static water storage and flowing water replenishment. Static water storage involves keeping the water in the planting area stagnant for a certain period during the same stage. For example, during the greening and tillering stages, the water in the planting area is kept stagnant; during the booting-heading stage, water is irrigated during the day and then kept stagnant, with drainage at night. However, when the water is stagnant, if plants die, they are prone to decay and methane emissions. Furthermore, the dissolved oxygen in stagnant water is lower than in flowing water. The "daytime irrigation, nighttime drainage" flowing water replenishment method can reduce methane emissions and increase dissolved oxygen in the water to some extent. However, the replenishment process also increases the total water usage. More importantly, if the water to be discharged contains abundant nitrogen and phosphorus, its direct discharge not only causes the loss of nutrient-rich substances but also leads to pollution of downstream waterways.

[0004] The inventors disclosed a planting method in their patent "A Closed-Loop Paddy Field Planting System and Method" that uses a closed-loop flowing water body to maintain the water level in the planting area. This method utilizes aquatic plants to reduce the nitrogen and phosphorus content in the closed-loop flowing water body and increase the dissolved oxygen content. However, in existing technologies, aquatic plants are usually planted extensively in arbitrary locations within ecological restoration ditches, making them difficult to manage and unable to meet the stage control requirements of the closed-loop flowing water body. Utility Model Content

[0005] The purpose of this invention is to provide an aquatic plant planting device for closed-loop rice paddy cultivation. It can carry multiple planting cups and plant aquatic plants in each cup, thereby allowing various aquatic plants to be placed into the ecological restoration channel as needed to purify the water. At the same time, the detachable planting cups also allow the number of planting cups on the planting device to be increased or decreased according to different growth stages of rice, thereby adjusting the total amount of aquatic plants to meet the stage control requirements of the closed-loop flowing water.

[0006] The above objectives are achieved through the following technical solutions:

[0007] Aquatic plant cultivation device for closed-loop paddy field cultivation includes a planting frame for conforming to the canal wall, a plurality of planting cups are detachably mounted on the planting frame, each planting cup includes a shell, the interior of the shell is provided with a planting cavity for accommodating aquatic plants and soil, and the shell has an opening communicating with the planting cavity.

[0008] In this technical solution, the aquatic plant planting device includes a planting frame, which has a contact surface and a planting surface. When the planting frame is placed in the ecological restoration ditch of a closed-loop paddy field planting system, the contact surface of the planting frame is attached to the ditch wall, while the opposite planting surface is used to install planting cups for planting aquatic plants. In one or more embodiments, the planting frame can be a flat plate structure or a frame structure.

[0009] In this technical solution, a plurality of planting cups are detachably mounted on the planting rack. The detachable connection between the planting cups and the planting rack can be a snap-fit ​​or a threaded connection. For example, a snap-fit ​​protrusion can be provided on the planting cup, and a snap-fit ​​groove can be provided on the planting rack, allowing the planting cup to be snapped into the planting rack. Alternatively, both the planting cup and the planting rack can be provided with threaded holes, and the planting cup can be detachably mounted on the planting rack by means of a bolt and the threaded connection of the threaded holes. In some preferred embodiments, the planting cups can be indirectly mounted on the planting rack using fasteners.

[0010] In this technical solution, the planting cup includes a shell, and the planting cavity inside the shell is used to place soil and aquatic plants. After the aquatic plants grow inside the planting cavity, their stems and leaves can grow out from the opening, purifying the flowing water.

[0011] When using the planter, place the soil into the planting cup and plant the required aquatic plants in the soil. Install the required number of planting cups on the planting rack and then install the planting rack inside the wall of the ecological restoration ditch. When water flows through the planting cup, it can enter the planting cavity through the opening, prolonging the contact time between the water flow and the aquatic plants. The aquatic plants continuously purify the closed-loop water in the ecological restoration ditch, reducing the nitrogen and phosphorus content in the water and increasing the dissolved oxygen content.

[0012] In this technical solution, after the planting cups are fixed together on the planting rack, the position of aquatic plants in the ecological restoration canal can be controlled. At the same time, by setting the planting rack on the wall of the ecological restoration canal, not only can the impact of aquatic plants and planting devices on water flow be reduced, but also the aquatic plants will not intercept or entangle floating or carried substances in the water, such as branches and straw, thus avoiding damage to the aquatic plants and facilitating the subsequent retrieval and removal of floating or carried substances.

[0013] In this technical solution, by installing detachable planting cups on the planting rack, the quantity and even the species of aquatic plants in the ecological restoration canal can be relatively controlled. Controlling the quantity of aquatic plants is crucial for the water quality in a closed-loop rice paddy planting system. This is because the nitrogen and phosphorus content in the water varies at different stages of rice growth. For example, in the days following fertilization, the nitrogen and phosphorus content in the ecological restoration canal is significantly higher, requiring more aquatic plants during this stage; otherwise, the nitrogen and phosphorus content will exceed the absorption limit of the aquatic plants, resulting in poor purification. However, in the middle and later stages of rice growth, close to harvest, the nitrogen and phosphorus content in the water is significantly lower, requiring fewer aquatic plants during this stage; otherwise, the growth of the aquatic plants will be affected, or they may even die, polluting the water. In this technical solution, the planting device allows for adjusting the number of planting cups based on the differences in nitrogen and phosphorus content in the closed-loop flowing water at different stages of rice growth, thereby controlling the total amount of aquatic plants. Furthermore, by planting different aquatic plants in different planting cups, such as planting cups of different colors, the quantity of various aquatic plants in the current closed-loop rice paddy planting system can be further controlled, achieving better water purification and water management.

[0014] Furthermore, the planting rack is equipped with several fixing components, and at least one planting cup is detachably connected to each fixing component. In this technical solution, by connecting at least one planting cup to the fixing component, the planting cup can be modularly installed or removed. For example, planting cups on the same fixing component can be planted with the same type of aquatic plant. When it is necessary to add or remove aquatic plants, the same fixing component can be directly installed on the planting rack or removed from the planting rack, improving the flexibility and efficiency of adjusting the number of aquatic plants.

[0015] Furthermore, the planting rack adopts a frame structure. Specifically, the planting rack includes several horizontal bars and several vertical bars, which are perpendicularly connected to form several placement holes for placing the fixing components. In this technical solution, the planting rack with a frame structure formed by the connection of horizontal and vertical bars can effectively reduce the total weight of the planting rack and facilitates adjusting the height of the planting rack and increasing or decreasing the number of fixing components and planting cups on the planting rack during use.

[0016] Furthermore, the horizontal bar is provided with a slot for connecting a mounting plate, and the mounting plate is provided with mounting holes; the bottom of the fastener is provided with a mounting rod that matches the mounting holes.

[0017] Furthermore, the planting rack can move up and down along the canal wall. At various stages of rice growth, the water level in the planting area needs to be adjusted via a reservoir; for example, the water level needs to be lowered during the tillering stage when the field is being dried. Since the planting area is connected to the ecological restoration canal, the water level in the canal will also change accordingly. However, aquatic plants require a stable water depth for growth. Therefore, in this technical solution, the planting rack can move up and down along the canal wall to adjust the height of the aquatic plants, ensuring they are at a stable water depth, improving their survival rate, and ensuring they can continuously and stably absorb eutrophic substances and release dissolved oxygen from the water.

[0018] In a preferred embodiment of the present invention, the planting frame is driven to move along the canal wall. The planting frame is connected to a traction rope, which is connected to a rope roller set on the canal bank. The rope roller can pull the planting frame up and down along the canal wall by rotating.

[0019] In this technical solution, rope rollers are installed on the banks of the ecological restoration canal. These rollers can be rotated manually or by a motor. By rotating the rollers, the traction ropes can be wound up or released, thereby raising or lowering the height of the planting racks relative to the canal wall, allowing the aquatic plants to be maintained at the desired water depth according to changes in the water level.

[0020] As another preferred embodiment of the present invention for driving the planting frame to move along the canal wall, the surface of the planting frame for fitting the canal wall, i.e. the fitting surface, is provided with a groove, and a rack is provided in the groove. A drive motor is also provided on the canal bank, and the output end of the drive motor is connected to a gear that meshes with the rack.

[0021] In this technical solution, a drive motor is installed on the canal bank, and a gear is connected to the output end of the drive motor. The gear meshes with a rack in a groove, thereby rotating the gear to drive the planting frame to move up and down along the canal wall. In one or more embodiments, an extension rod is also connected to the planting frame, and the groove and rack may be entirely or partially located on the extension rod.

[0022] Furthermore, the shell of the planting cup has several through holes located below the opening, and these through holes connect to the planting cavity. In this technical solution, several through holes are provided on the shell, connecting the planting cavity to the external space. When the roots of aquatic plants grow in the soil, they can extend out through the through holes, which facilitates the release of dissolved oxygen into the water through the roots.

[0023] Furthermore, the shell has a water-facing surface and a water-repellent surface, wherein when water flows through the shell, the impact force of the water flow on the water-facing surface is greater than the impact force of the water flow on the water-repellent surface, and the through hole is provided on the water-repellent surface.

[0024] In this technical solution, the outer wall of the shell includes a water-facing surface and a water-repellent surface. The water-facing surface is the surface facing the water flow when it impacts the shell, while the water-repellent surface is the surface opposite to the water-facing surface. Therefore, when water flows in a specific direction in the ecological restoration channel, the impact on the water-facing surface will be greater than the impact on the water-repellent surface. By placing the through-holes on the water-repellent surface, not only can the impact of the water flow on the roots of aquatic plants be reduced, but the impact of the water flow on the soil inside the through-holes is also prevented.

[0025] Furthermore, the shell of the planting cup is shaped like a hemisphere or a semi-ellipsoid. By making the outer wall of the shell curved, it is beneficial to reduce the impact of the shell surface on the closed-loop flow of water.

[0026] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0027] 1. This utility model achieves controllable position of aquatic plants in ecological restoration canals by fixing the planting cups together on the planting rack. At the same time, it also allows for adjusting the number of planting cups to increase or decrease according to the difference in nitrogen and phosphorus content of the closed-loop water body at different stages of rice growth, thereby controlling the total amount of aquatic plants and achieving better water purification and water management.

[0028] 2. The planting rack of this utility model can move up and down along the wall of the ecological restoration ditch, thereby adjusting the height of the aquatic plants, so that the aquatic plants are at a stable water depth, improving the survival rate of the aquatic plants, and ensuring that the aquatic plants can continuously and stably absorb eutrophic substances in the water and release dissolved oxygen.

[0029] 3. The planting rack of this utility model adopts a frame structure, which can effectively reduce the total weight of the planting rack and facilitate the adjustment of the height of the planting rack and the increase or decrease of the number of fixing parts and planting cups on the planting rack during use;

[0030] 4. The planting cup of this utility model is provided with several through holes. When the roots of aquatic plants grow in the soil, they can extend out through the through holes, which is conducive to releasing dissolved oxygen into the water through the roots. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram of the aquatic plant planting device installed on the wall of an ecological restoration canal in a specific embodiment of this utility model;

[0033] Figure 2This is a schematic diagram of the structure of the planting rack in a specific embodiment of this utility model;

[0034] Figure 3 This is a schematic diagram of the structure of the gear and rack transmission planting frame in a specific embodiment of this utility model;

[0035] Figure 4 This is a schematic diagram of the structure of the fixing member with the planting cup fixed in a specific embodiment of this utility model;

[0036] Figure 5 This is a schematic diagram of the water circulation structure in a closed-loop paddy field planting system according to a specific embodiment of this utility model.

[0037] The attached diagram shows the markings and corresponding component names:

[0038] 1-Planting rack, 2-Mounting plate, 3-Fixed component, 31-Mounting rod, 4-Planting cup, 41-Water-facing side, 42-Water-repellent side, 43-Opening, 44-Planting cavity, 45-Through hole, 5-Aquatic plant, 6-Traction rope, 7-Rope roller, 8-Support, 9-Pulley, 10-Ditch wall, 11-Horizontal bar, 12-Vertical bar, 13-Slot, 14-Placement hole, 15-Extension rod, 16-Groove, 17-Rack, 18-Gear;

[0039] 21-Planting area, 22-Inlet pond, 23-First ecological restoration canal, 24-Second ecological restoration canal, 25-Irrigation pipe, 26-Water storage pond, 27-Drainage gate, 28-Aquatic plant area, 29-Water pump, 210-Water-blocking platform, 211-Canal bank. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0041] In the description of this utility model, it should be understood that the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0042]

Example 1

[0043] like Figures 1 to 4The aquatic plant planting device shown for closed-loop paddy field planting includes a planting frame 1 for conforming to the canal wall 10. Several planting cups 4 are detachably installed on the planting frame 1. Each planting cup 4 includes a shell. The interior of the shell is provided with a planting cavity 44 for accommodating aquatic plants and soil. An opening 43 is provided on the shell to communicate with the planting cavity 44.

[0044] In one or more embodiments, the aquatic plants can be selected from common non-floating aquatic plants according to actual needs, such as cattails, water celery, hornwort, water bamboo, etc.

[0045] In one or more embodiments, depending on the water depth, multiple rows of planting cups can be set on the planting rack, and the aquatic plants planted in the planting cups in different rows can be the same or different.

[0046] In this embodiment, by setting detachable planting cups on the planting rack, the quantity and even the species of aquatic plants in the ecological restoration canal can be relatively controlled. Controlling the quantity of aquatic plants is crucial for the water quality in a closed-loop rice paddy planting system. This is because the nitrogen and phosphorus content in the water varies at different stages of rice growth. For example, in the days following fertilization, the nitrogen and phosphorus content in the ecological restoration canal is significantly higher, requiring more aquatic plants during this stage; otherwise, the nitrogen and phosphorus content will exceed the absorption limit of the aquatic plants, resulting in poor purification. However, in the middle and later stages of rice growth, close to harvest, the nitrogen and phosphorus content in the water is significantly lower, requiring fewer aquatic plants during this stage; otherwise, the growth of the aquatic plants will be affected, or they may even die, polluting the water. In this technical solution, the planting device allows for adjusting the number of planting cups based on the differences in nitrogen and phosphorus content in the closed-loop flowing water at different stages of rice growth, thereby controlling the total amount of aquatic plants. Furthermore, by planting different aquatic plants in different planting cups, such as planting cups of different colors, the quantity of various aquatic plants in the current closed-loop rice paddy planting system can be further controlled, achieving better water purification and water management.

[0047] In some preferred embodiments, the planting rack 1 is provided with a plurality of fixing members 3, and at least one planting cup 4 is detachably connected to the fixing member 3.

[0048] In one or more embodiments, 2 to 5 planting cups 4 are connected to the fastener 3.

[0049] In one or more embodiments, the fixing member can be a permeable brick with a slot on it and a protrusion on the shell of the planting cup. The planting cup can be detachably fixed to the permeable brick by the cooperation of the protrusion and the slot.

[0050] In some preferred embodiments, such as Figure 2As shown, the planting frame 1 includes several horizontal rods 11 and several vertical rods 12. The horizontal rods 11 and vertical rods 12 are vertically connected to form several placement holes 14, which are used to place the fixing member 3.

[0051] In some preferred embodiments, the horizontal bar 11 is provided with a slot 13 for connecting the mounting plate 2, and the mounting plate 2 is provided with a mounting hole; the bottom of the fixing member 3 is provided with a mounting rod 31, and the mounting rod 31 matches the mounting hole.

[0052] During assembly, the mounting plate's latches engage with the slots to form a stable connection between the mounting plate and the planting frame. Then, the mounting rod of the fastener is inserted into the mounting hole on the mounting plate, and bolts are used to connect the fastener to the mounting plate. In one or more embodiments, the mounting plate and the planting frame can also be detachably connected using screws and bolts.

[0053]

Example 2

[0054] Based on Example 1, such as Figure 1 As shown, the planting frame 1 can move up and down along the channel wall 10. A traction rope 6 is connected to the planting frame 1. The traction rope 6 is connected to a rope roller 7 set on the channel bank 211. The rope roller 7 can pull the planting frame 1 up and down along the channel wall 10 by rotating.

[0055] In one or more embodiments, such as Figure 1 As shown, a support post 8 is also installed on the canal bank 211, and a fixed pulley 9 is installed on the support post 8. The traction rope 6 passes around the fixed pulley 9. The fixed pulley 9 provides a higher fulcrum for the traction rope 6, allowing the planting frame to move up and down along the canal wall 10 more effectively.

[0056]

Example 3

[0057] Based on Example 1, such as Figure 1 As shown, the planting frame 1 can move up and down along the channel wall 10. The surface of the planting frame 1 that is used to fit the channel wall 10 is provided with a groove 16. A rack 17 is provided in the groove 16. A drive motor is also provided on the channel bank 211. The output end of the drive motor is connected to a gear 18 that meshes with the rack 17.

[0058] In one or more embodiments, the planting rack is also connected to an extension rod 15, and the groove 16 and the rack 17 may be all or partly provided on the extension rod 15.

[0059]

Example 4

[0060] Based on the above embodiments, such as Figure 4As shown, the shell of the planting cup 4 has several through holes 45 located below the opening 43. These through holes 45 connect to the planting cavity 44. The shell has a water-facing surface 41 and a water-repellent surface 42. As shown, when water flows through the shell from right to left, the impact force of the water flow on the water-facing surface 41 is greater than that on the water-repellent surface 42. The through holes 45 are located on the water-repellent surface 42. By placing the through holes on the water-repellent surface, not only is the impact of the water flow on the roots of the aquatic plants reduced, but the impact of the water flow on the soil inside the through holes is also prevented.

[0061] In some preferred embodiments, the shell of the planting cup 4 is shaped as a hemisphere or a semi-ellipsoid.

[0062]

Example 5

[0063] like Figure 5 The diagram illustrates a closed-loop paddy field planting system. A first ecological restoration canal 23 and a second ecological restoration canal 24 are positioned along the edges of the planting areas. A water storage tank 26 is located near the outlet of the second ecological restoration canal 24, and a water-blocking platform 210 is installed between the tank and the canal. Water from the second ecological restoration canal 24 is pumped into the water storage tank 26 via a water pump 29. The water storage tank 26 is connected to an inlet pool 22, the outlet of which is connected to the inlet of the first ecological restoration canal 23. The first ecological restoration canal 23 extends between the two planting areas 21 and irrigates the two planting areas 21 using an irrigation pipe 25.

[0064] In any of the foregoing embodiments, the aquatic plant planting device is set in the aquatic plant area 28 of the first and second solid restoration channels.

[0065] In some embodiments, a drainage gate 27 is provided between the planting area 21 and the second ecological restoration canal 24. During the fertilization stage, the drainage gate 27 can be closed to allow the rice to fully absorb nutrients from the fertilizer-containing water, while reducing the absorption pressure on the aquatic plants in the second ecological restoration canal. During closed-loop flow, the drainage gate 27 is opened, and the water in the planting area 21 continuously flows through the drainage gate 27 into the second ecological restoration canal 24 and moves along the canal. During this movement, the aquatic plants act on the water they pass through, reducing its nitrogen and phosphorus content and increasing its dissolved oxygen content.

[0066] In use, the water in the reservoir 26 is irrigated to the planting area 21 via the first ecological restoration channel 23, and the water in the planting area 21 is returned to the reservoir 26 via the second ecological restoration channel 24. As the water flows through the first ecological restoration channel 23 and / or the second ecological restoration channel 24, the aquatic plants 5 in the planting cups of the aquatic plant planting device in the aquatic plant area 28 reduce nitrogen and phosphorus levels in the water and increase dissolved oxygen levels.

[0067] The terms "first," "second," etc., used in this utility model (e.g., first ecological restoration canal, second ecological restoration canal, etc.) are merely for the purpose of clarity in description and are not intended to limit any order or emphasize importance. Furthermore, the term "connection" used in this utility model, unless otherwise specified, can refer to a direct connection or an indirect connection via other components.

[0068] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An aquatic plant cultivation device for closed-loop paddy field cultivation, characterized in that, The planter includes a planting rack (1) for fitting against the channel wall (10), and a plurality of planting cups (4) are detachably provided on the planting rack (1). Each planting cup (4) includes a shell, and the interior of the shell is provided with a planting cavity (44) for accommodating aquatic plants and soil. An opening (43) is provided on the shell to communicate with the planting cavity (44).

2. The aquatic plant cultivation device for closed-loop paddy field cultivation according to claim 1, characterized in that, The planting rack (1) is provided with several fasteners (3), and at least one planting cup (4) is detachably connected to the fasteners (3).

3. The aquatic plant cultivation device for closed-loop paddy field cultivation according to claim 2, characterized in that, The planting frame (1) includes several horizontal rods (11) and several vertical rods (12). The horizontal rods (11) and vertical rods (12) are vertically connected to form several placement holes (14). The placement holes (14) are used to place the fixing member (3).

4. The aquatic plant cultivation device for closed-loop paddy field cultivation according to claim 3, characterized in that, The horizontal bar (11) is provided with a slot (13) for connecting the mounting plate (2), and the mounting plate (2) is provided with a mounting hole; the bottom of the fastener (3) is provided with a mounting rod (31) that matches the mounting hole.

5. The aquatic plant cultivation device for closed-loop paddy field cultivation according to any one of claims 1 to 4, characterized in that, The planting rack (1) can move up and down along the channel wall (10).

6. The aquatic plant cultivation device for closed-loop paddy field cultivation according to claim 5, characterized in that, The planting frame (1) is connected to a traction rope (6), which is connected to a rope roller (7) set on the canal bank (211). The rope roller (7) can rotate to pull the planting frame (1) up and down along the canal wall (10).

7. The aquatic plant cultivation device for closed-loop paddy field cultivation according to claim 5, characterized in that, The planting frame (1) has a groove (16) on the surface for fitting the channel wall (10), and a rack (17) is provided in the groove (16). A drive motor is also provided on the channel bank (211), and the output end of the drive motor is connected to a gear (18) that meshes with the rack (17).

8. The aquatic plant cultivation device for closed-loop paddy field cultivation according to any one of claims 1 to 4, characterized in that, The implantation cup (4) has several through holes (45) located below the opening (43) on its shell, and the through holes (45) are connected to the implantation cavity (44).

9. The aquatic plant cultivation device for closed-loop paddy field cultivation according to claim 8, characterized in that, The shell has a water-facing surface (41) and a water-repellent surface (42). When water flows through the shell, the water-facing surface (41) is subjected to a greater impact force from the water flow than the water-repellent surface (42). The through hole (45) is provided on the water-repellent surface (42).

10. The aquatic plant cultivation device for closed-loop paddy field cultivation according to claim 8, characterized in that, The shell of the planting cup (4) is shaped as a hemisphere or a semi-ellipsoid.

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