An automatic watering device for seedling planting

Abstract

An automatic watering device for seedling planting includes a cylindrical water storage tube, a top cover, a locking cap, a bottom cover, an inlet pipe, an outlet nozzle, a sealing gasket, a float valve, and absorbent material. The top and bottom covers seal the cylindrical water storage tube from both ends, forming a cylindrical water storage tube. The inlet pipe, outlet nozzle, sealing gasket, and float valve constitute a water level controller. The absorbent material wraps around the float valve, and water stored in the water storage tube is transported upwards from the bottom of the tube to the top of the float valve by the adsorption of the absorbent material. The seedling planting protection device and the automatic watering device together create a semi-enclosed microenvironment that extends deep below the ground, providing watering and sufficient light, thus promoting seedling growth and development.

Description

Technical Field

[0001] This invention belongs to the forestry field and relates to protective devices and watering devices for afforestation, and particularly to an automatic watering device for seedling planting. Background Technology

[0002] Afforestation is an important means of preventing wind erosion and sandstorms, addressing desertification in my country, reducing soil erosion, and improving the ecological environment. Sowing, seedling planting, and cutting propagation are commonly used methods. These methods require specific land conditions, such as soil structure, temperature, and humidity. Because the conditions in afforestation areas are often unfavorable, the survival rate of sown seeds and planted seedlings is low due to the poor environment, affecting the afforestation effect. Therefore, carrying out seedling tending and protection, and improving the local survival conditions of seedlings, is a crucial step in ensuring seedling survival. Existing tree protection devices and methods are costly and mostly used in small areas such as landscape trees, making them unsuitable for large-scale afforestation projects. Therefore, there is a need to provide a low-cost forestry protection tool and automatic irrigation device to improve the survival rate of planted trees. Summary of the Invention

[0003] To address the protection of seedlings, this invention provides a seedling planting protection device, characterized in that: the seedling planting protection device includes a light-transmitting protective cover and a protective cylinder; the light-transmitting protective cover is a transparent plastic cover with a cap formed by multiple protruding fan-shaped cylindrical surfaces, and the inner side of the light-transmitting protective cover is partially covered with a reflective layer, the upper edge of the reflective layer forming a beveled surface with a certain angle, forming a light-transmitting window, through which light enters the light-transmitting protective cover; the protective cylinder is a cylindrical double-layer structure formed by combining multiple double-layer hollow insulation materials, the inner side of the protective cylinder is set as a prism surface formed by multiple protruding fan-shaped cylindrical surfaces, and the inner surface is covered with a reflective layer.

[0004] To achieve the seedling planting protection device described in this invention, the following technical solution is proposed: the seedling planting protection device includes a light-transmitting protective cover and a protective cylinder.

[0005] The light-transmitting protective cover is a transparent plastic cover with a top sealed by multiple raised fan-shaped cylindrical surfaces. The top of the light-transmitting protective cover is pointed to prevent dust from accumulating. Multiple perforated ventilation holes are provided on the cover to allow air circulation. The top and some sides of the cover remain transparent, while the rest of the inner part is covered with a silver reflective layer. The upper edge of the reflective layer forms a beveled surface with a certain angle, creating a transparent light-transmitting window at the top of the cover, allowing light to enter. The surface of the reflective layer is made of raised fan-shaped cylindrical surfaces, creating a convex mirror effect that scatters incoming light, preventing the convergence of light on the reflective surface and the formation of high-temperature scorching spots that could burn the seedlings. The lower edge of the cover has inner and outer side rails, which are used to fix the cover to the top of the protective cylinder in a nested manner.

[0006] The protective cylinder has a double-layer structure, consisting of multiple layers of hollow insulation material arranged together to form a cylindrical shape. One side of the hollow insulation material is a convex, wavy cylindrical surface composed of multiple fan-shaped cylindrical surfaces, covered with a silver reflective layer. Connecting joints are located at both ends. These multiple layers of hollow insulation material are joined together to form a cylindrical protective cylinder. The outer layer is a circular thin-walled tube, while the inner layer is a prismatic thin-walled tube composed of multiple convex fan-shaped cylindrical surfaces. The outer and inner layers are connected by a grid-like sheet, forming a hollow double-layer structure. The inner surface of the protective cylinder is covered with a silver reflective layer, creating a convex mirror effect that scatters incoming light, preventing the convergence of light on reflective surfaces and the formation of high-temperature scorching spots that could burn seedlings.

[0007] The beneficial effects of the seedling planting protection device described in this invention are as follows: the light-transmitting protective cover and protective cylinder constituting the seedling planting protection device have a simple structure, low cost, and can be reused; the protective cylinder adopts a double-layer heat insulation structure, which has the functions of high temperature resistance, cold protection, and wind and sand protection, thereby improving the seedlings' ability to resist high temperature and severe cold; the inner wall surface of the seedling planting protection device is a prism surface composed of multiple fan-shaped cylindrical surfaces, and the surface is covered with a reflective layer. After light enters, it is reflected and scattered multiple times, so that it can reach the bottom, providing sufficient light conditions for the seedlings.

[0008] To address the issue of watering and maintaining seedlings, this invention provides an automatic watering device for seedling planting. The device comprises a water storage cylinder, a top cover, a locking cap, a bottom cover, an inlet pipe, an outlet nozzle, a sealing gasket, a float valve, and absorbent material. The top and bottom covers seal the water storage cylinder from both ends, forming a cylindrical water storage cylinder. An overflow hole and an vent are provided on the side of the water storage cylinder. The inlet pipe, outlet nozzle, sealing gasket, and float valve constitute a water level controller for controlling the water level within the storage cylinder. The absorbent material wraps around the float valve, and evenly distributed circular perforations on the absorbent material increase the contact area with air.

[0009] To realize the automatic watering device for seedling planting described in this invention, the following technical solution is proposed: The automatic watering device includes a water storage cylinder, a water storage cylinder top cover, a locking cap, a water storage cylinder bottom cover, a water inlet pipe, a water outlet nozzle, a sealing gasket, a float valve, and water-absorbing material; the water storage cylinder top cover and the water storage cylinder bottom cover seal the water storage cylinder from both ends to form a cylindrical water storage cylinder; an overflow hole and a vent hole are provided on the side of the water storage cylinder, with the overflow hole below the vent hole; the water inlet pipe, the water outlet nozzle, the sealing gasket, and the float valve constitute a water level controller; the float valve is a cylindrical air float with an open bottom and a cylindrical sleeve at the top; the sealing gasket is installed inside the cylindrical sleeve of the float valve; the water outlet nozzle is fixed to the lower end of the water inlet pipe and is inserted into the cylindrical sleeve of the float valve along with the water inlet pipe. Water is injected into the water storage tank through the inlet pipe and outlet nozzle, causing the water level in the tank to rise. This causes the float valve to move upwards, pushing the sealing gasket to block the lower end of the outlet nozzle, preventing water from entering the tank and thus controlling the water level. The water level can be adjusted by controlling the length of the inlet pipe inserted into the tank. The absorbent material is a cylindrical tube, with its lower half wrapping around the float valve and its upper half having evenly spaced circular through-holes to increase the contact area between the absorbent material and air. Water stored in the tank is then transported upwards from the bottom of the tank to above the float valve under the adsorption of the absorbent material.

[0010] The automatic watering device has two operating modes.

[0011] Gaseous water circulation working mode: By installing a pressure reducing device at the water source outlet to reduce the water pressure in the water supply pipeline, the water pressure in the inlet pipe is kept at a low pressure. The water level controller, consisting of the inlet pipe, outlet nozzle, sealing gasket, and float valve, automatically regulates the water level in the storage tank. Adjusting the length of the inlet pipe inserted into the storage tank controls the water level below the overflow hole. At this time, the automatic watering device enters the gaseous water circulation working mode. The water stored in the storage tank cannot flow directly into the soil. Instead, under the adsorption of the water-absorbing material, it is transported from the bottom of the storage tank upward to the top of the float valve. The evenly distributed circular through holes in the upper part of the water-absorbing material increase the contact area between water and air, thereby improving the evaporation efficiency of water and turning water into water vapor. The water vapor enters the soil through the overflow hole and vent hole on the side of the circular pipe of the storage tank, realizing the purpose of watering the soil in the form of gaseous water circulation.

[0012] Direct irrigation mode: The pressure reducing device at the water source outlet is short-circuited, and the water source directly supplies water to the water supply pipeline, increasing the water pressure in the pipeline. This results in a higher water pressure in the inlet pipe. Due to the increased water pressure, the water level balance formed by the automatic watering device in the gaseous water circulation mode is broken, causing more water to be injected into the storage tank. The water level in the storage tank rises, reaching or even exceeding the overflow hole. At this time, the automatic watering device enters the direct irrigation mode. The water stored in the storage tank flows directly into the soil through the overflow hole on the side of the storage tank's circular pipe, directly irrigating the soil and achieving the purpose of applying water to the soil through direct irrigation.

[0013] The beneficial effects of the automatic watering device for seedling planting described in this invention are as follows: By simply controlling the water supply pressure, the device can switch between two working modes: gaseous water circulation and direct irrigation. In the gaseous water circulation mode, water vapor is used to replenish the soil, providing the minimum necessary moisture for seedling growth continuously and achieving maximum water conservation. In the direct irrigation mode, liquid water is directly added to the soil, quickly resolving water shortages in extreme environments. The automatic watering device of this invention replenishes water directly from the soil, resulting in minimal, negligible, water loss, making it more water-efficient than traditional watering methods.

[0014] To fully leverage the advantages of the seedling planting protection device and automatic watering device described in this invention, this invention provides a tree planting method characterized by: planting seedlings in deep pits, where the seedling planting protection device and automatic watering device described in this invention create a microenvironment below ground level with watering capabilities and sufficient sunlight, providing a favorable growth environment for the seedlings, improving their survival rate, and achieving the goal of increasing the survival rate of afforestation.

[0015] The tree planting method of the present invention includes the following steps:

[0016] A. Dig a deep pit with a certain diameter and depth at the location where trees need to be planted, bury the automatic watering device described in this invention in the soil at the bottom edge of the pit, and make the side with the overflow hole and the vent hole face the center of the pit. Add nutrient-rich soil to the bottom of the pit.

[0017] B. Place the protective cylinder described in this invention into a deep pit, with a portion of the protective cylinder protruding above the ground, and fill the surrounding area with soil.

[0018] C. Sow seedling seeds in the nutrient soil at the bottom of the protective tube, or insert seedling cuttings, or plant seedlings to complete the planting steps;

[0019] D. Place the light-transmitting protective cover over the protective cylinder and supply water to the automatic watering device through the water supply pipeline to form a semi-enclosed microenvironment formed by the seedling planting protective device, which extends deep into the ground and has watering function and sufficient light conditions, to promote the growth and development of seedlings.

[0020] E. Adjust the direction of the light-collecting window of the light-collecting protective cover according to the lighting conditions. When the direction of the light-collecting window is away from the direction of sunlight, the amount of light entering can be reduced, thereby reducing the illuminance inside the seedling planting protective device. Conversely, it can increase the illuminance inside the seedling planting protective device.

[0021] F. When the seedling root system is mature and can adapt to the external environment, remove the light-transmitting protective cover, allowing the seedling to come into direct contact with the outside world, so that the seedling can grow freely, achieve the purpose of hardening off the seedling and improve the seedling's environmental adaptability.

[0022] G. Once the seedlings have fully adapted to the external environment, remove the protective casing and automatic watering device, leaving the deep pit intact, or fill the deep pit to complete the tree planting work.

[0023] The beneficial effects of the tree planting method provided by this invention are as follows: Utilizing the seedling planting protection device and automatic watering device provided by this invention, and employing a deep pit planting method that extends below ground level, the soil's internal moisture can be utilized more fully, reducing water application. Simultaneously, it enhances the seedlings' resistance to high temperatures and severe cold, while also providing wind protection. Light enters the seedling planting protection device through a light-transmitting protective cover, and after multiple reflections by the reflective layer, enters the bottom of the protective cylinder, providing ample sunlight for the seedlings. By controlling the water pressure to adjust the working mode of the automatic watering device, the necessary water for seedling growth is provided continuously over a long period, achieving water conservation. Under the protection of the favorable microenvironment created by the seedling planting protection device and automatic watering device, the seedling survival rate is greatly improved, enabling afforestation in water-scarce, severely desertified, and otherwise unsuitable environments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the application of the automatic watering device for seedling planting described in this invention.

[0025] Figure 2 This is an exploded view of the structure of the light-transmitting protective cover of a seedling planting protection device according to the present invention.

[0026] Figure 3 This is an exploded view of the protective cylinder structure of a seedling planting protection device according to the present invention.

[0027] Figure 4 This is an exploded view of the structure of an automatic watering device for seedling planting according to the present invention.

[0028] Figure 5 This is a schematic diagram of the gaseous water circulation working mode of an automatic watering device for seedling planting according to the present invention.

[0029] Figure 6 This is a schematic diagram of the direct irrigation working mode of an automatic watering device for seedling planting according to the present invention.

[0030] In the diagram: 1. Light-transmitting protective cover, 2. Protective cylinder, 3. Automatic watering device, 4. Water supply pipeline, 5. Soil, 6. Seedlings and plants, 7. Nutrient soil, 101. Light-transmitting protective cover shell, 102. Ventilation hole, 103. Reflective layer of light-transmitting protective cover, 201. Protective cylinder assembly, 202. Reflective layer of protective cylinder, 203. Convex joint, 204. Concave joint, 301. Locking cap, 302. Water storage cylinder top cover, 303. Water storage cylinder round pipe, 304. Vent hole, 305. Overflow hole, 306. Water storage cylinder bottom cover, 307. Water-absorbing material, 308. Circular through hole, 309. Float valve, 310. Float valve guide hole, 311. Sealing gasket, 312. Water outlet, 313. Water inlet pipe, 314. Water level in water storage cylinder, 315. Water level in float valve cavity. Implementation

[0031] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] Figure 1 The diagram illustrates the application of the automatic watering device for seedling planting described in this invention.

[0033] like Figure 1As shown, the light-transmitting protective cover 1 and the protective cylinder 2 constitute a seedling planting protective device. Part of the protective cylinder 2 is exposed above the ground, and the rest is buried in the soil 5, forming a deep pit that extends below the ground. The automatic watering device 3 is buried at the edge of the deep pit, and the water supply pipeline 4 provides water to the automatic watering device 3 to complete the automatic watering operation. Nutrient soil 7 is placed at the bottom of the protective cylinder 2, and seedling plants 6 are planted in the nutrient soil 7. Alternatively, seedling seeds can be sown in the nutrient soil 7, or seedling cuttings can be inserted to complete the planting work.

[0034] Figure 2 An exploded view of the structure of the light-transmitting protective cover 1 of the seedling planting protection device described in this invention is shown.

[0035] like Figure 2 As shown, the light-transmitting protective cover 1 consists of a light-transmitting protective cover shell 101 and a light-transmitting protective cover reflective layer 103. The light-transmitting protective cover shell 101 is a transparent plastic cover with a top cap formed by multiple protruding fan-shaped cylindrical surfaces. The top is pointed to prevent dust from accumulating. Ventilation holes 102 are provided on the top of the light-transmitting protective cover shell 101 for air circulation with the outside. The top and some sides of the light-transmitting protective cover shell 101 remain transparent, while the rest of the inner part is covered by the light-transmitting protective cover reflective layer 103. The plane enclosed by the upper edge of the light-transmitting protective cover reflective layer 103 has a... A slanted cut surface at a fixed angle forms a light-transmitting window, through which light enters the light-transmitting protective cover 1. The lower side of the light-transmitting protective cover 101 is provided with inner and outer side rails. The outer side rail of the light-transmitting protective cover 101 is fitted around the outside of the protective cylinder 2, and the inner side rail of the light-transmitting protective cover 101 is fitted inside the protective cylinder 2. The light-transmitting protective cover 101 is fixed to the protective cylinder 2 by the inner and outer side rails. Water droplets condensed inside the light-transmitting protective cover 1 slide down through the inner side rail of the light-transmitting protective cover 101 to the bottom of the protective cylinder 2 and flow into the soil 5, thus playing the role of recycling condensed water.

[0036] Figure 3 An exploded view of the structure of the protective cylinder 2 of the seedling planting protection device described in this invention is shown.

[0037] like Figure 3 As shown, the protective cylinder assembly 201 is a double-layer hollow insulation material. The left and right ends of the protective cylinder assembly 201 are provided with convex connectors 203 and concave connectors 204. Figure 3Partial view A shows the shape of the convex connector 203, and partial view B shows the shape of the concave connector 204. The inner layer of the protective cylinder assembly 201 is set as a wave-shaped thin plate surrounded by multiple convex fan-shaped cylindrical surfaces, and the surface is covered with a protective cylinder reflective layer 202. The outer layer of the protective cylinder assembly 201 is in the shape of a thin plate, and the middle is connected together by a grid-shaped thin sheet to form a hollow double-layer structure. Multiple protective cylinder assemblies 201 are combined together by convex connectors 203 and concave connectors 204 to form a cylindrical double-layer structure, forming the protective cylinder 2.

[0038] The reflective layer 202 of the protective cylinder is a wavy silver reflective layer that forms a convex mirror effect, causing the incoming light to scatter and preventing the reflection surface from converging the light to form a high-temperature spot that could scorch the seedlings.

[0039] Figure 4 An exploded view of the structure of the automatic watering device 3 described in this invention is shown.

[0040] like Figure 4 As shown, the automatic watering device 3 consists of a water storage cylinder pipe 303, a water storage cylinder upper cover 302, a locking cap 301, a water storage cylinder lower cover 306, a water inlet pipe 313, a water outlet nozzle 312, a sealing gasket 311, a float valve 309, and a water-absorbing material 307.

[0041] The upper cover 302 and the lower cover 306 of the water storage cylinder enclose the circular tube 303 of the water storage cylinder from both ends to form a cylindrical water storage cylinder; an overflow hole 305 and an exhaust hole 304 are provided on the side of the circular tube 303 of the water storage cylinder, with the overflow hole 305 located below the exhaust hole 304.

[0042] The water tank cover 302 has a threaded through-hole boss with a conical shape at the middle position. Three notches are evenly arranged on the boss to create a clamping effect. The locking cap 301 has corresponding threads and a conical contact surface. The water inlet pipe 313 is inserted into the through-hole in the middle of the water tank cover 302 and is locked and fixed to the water tank cover 302 by the locking cap 301.

[0043] The float valve 309 is a cylindrical air float with an open lower end and a cylindrical sleeve on the upper part. The cylindrical sleeve of the float valve 309 is provided with a float valve guide hole 310, through which water flows out.

[0044] The sealing gasket 311 is a sheet-shaped circular rubber seal that is installed inside the circular sleeve of the float valve 309.

[0045] The upper part of the water outlet nozzle 312 is in the shape of a round tube, and the lower part is in the shape of a cone with a narrowing lower edge. The water outlet nozzle 312 is inserted into the inlet pipe 313 and combined with the inlet pipe 313. The water outlet nozzle 312 is inserted into the round tube sleeve of the float valve 309 along with the inlet pipe 313. The lower edge of the water outlet nozzle 312 contacts the sealing gasket 311, which can more effectively block the water flow.

[0046] The inlet pipe 313, outlet nozzle 312, sealing gasket 311, and float valve 309 constitute a water level controller for controlling the water level 314 of the water storage tank. Water is injected into the water storage tank through the inlet pipe 313 and outlet nozzle 312, causing the water level 314 to rise. Under the action of buoyancy, the float valve 309 moves upward, pushing the sealing gasket 311 to block the lower end of the outlet nozzle 312, preventing water from being injected into the water storage tank, thus achieving the purpose of controlling the water level 314 of the water storage tank. The lower end of the float valve 309 has an open structure, and under the action of water pressure, a float valve chamber water level 315 is formed inside the cavity of the float valve 309. By controlling the length of the inlet pipe 313 inserted into the water storage tank, the height of the water level 314 of the water storage tank can be adjusted.

[0047] The water-absorbing material 307 is a circular tube with a variable diameter. The lower half of the water-absorbing material 307 wraps around the float valve 309, and the upper half is evenly provided with circular through holes 308. The function of the circular through holes 308 is to increase the contact area between the water-absorbing material 307 and the air. The water stored in the water storage cylinder is transported from the bottom of the water storage cylinder to the top of the float valve 309 under the adsorption of the water-absorbing material 307.

[0048] The automatic watering device 3 has two working modes: a gaseous water circulation mode and a direct watering mode.

[0049] Figure 5 A schematic diagram of the gaseous water circulation working mode of the automatic watering device 3 is shown.

[0050] like Figure 5As shown, by installing a pressure reducing device at the water source outlet to reduce the water pressure in the water supply pipeline 4, the pressure p1 of the water injected into the inlet pipe 313 is controlled to keep p1 at a lower pressure. The water level controller, consisting of the inlet pipe 313, the outlet nozzle 312, the sealing gasket 311, and the float valve 309, realizes the automatic regulation function of the water level 314 in the water storage tank. By adjusting the length of the inlet pipe 313 inserted into the water storage tank, the water level 314 in the water storage tank is controlled below the overflow hole 305, as shown in partial view C. At this time, the automatic water supply device 3 enters the gaseous water circulation. In the working mode, the water stored in the water storage tank cannot flow directly into the soil 5. Instead, under the adsorption of the water-absorbing material 307, it is transported from the bottom of the water storage tank upward to the top of the float valve 309. The circular through holes 308 evenly arranged in the upper part of the water-absorbing material 307 increase the contact area between water and air, thereby improving the evaporation efficiency of water and turning water into water vapor. The water vapor enters the soil 5 through the overflow hole 305 and the vent hole 304 on the side of the water storage tank circular tube 303, realizing the purpose of applying water into the soil 5 in the form of gaseous water circulation.

[0051] Figure 6 This is a schematic diagram of the direct irrigation mode of the automatic watering device 3.

[0052] like Figure 6 As shown, the pressure reducing device at the water source outlet is short-circuited, and the water source directly supplies water to the water supply pipeline 4, so that the water pressure p2 in the inlet pipe 313 is in a high pressure state, p2>p1, which breaks the water level balance state formed by water pressure p1 when the automatic water application device 3 is in the gaseous water circulation working mode. The water level 315 in the float valve chamber rises, the buoyancy of the float valve 309 decreases, which increases the amount of water injected into the water storage tank, and the water level 314 in the water storage tank rises, reaching or even exceeding the overflow hole 305, as shown in partial view D. At this time, the automatic water application device 3 enters the direct irrigation working mode. The water stored in the water storage tank flows directly into the soil 5 through the overflow hole 305 on the side of the water storage tank circular pipe 303, directly irrigating the soil 5 and realizing the purpose of applying water to the soil 5 by direct irrigation.

[0053] like Figure 1 As shown, the tree planting method provided by the present invention includes the following steps:

[0054] A. Dig a deep pit with a certain diameter and depth at the location where trees need to be planted, bury the automatic watering device 3 described in this invention into the soil 5 at the bottom edge of the pit, and make the side with the overflow hole 305 and the vent hole 304 face the center of the pit, and add nutrient soil 7 to the bottom of the pit.

[0055] B. Place the protective cylinder 2 of the present invention into the deep pit, with a portion of the protective cylinder 2 protruding above the ground, and fill the surrounding area with soil;

[0056] C. Taking the planting of seedlings as an example, plant the seedlings 6 into the nutrient soil 7 at the bottom of the protective tube 2 to complete the planting steps.

[0057] D. Place the light-transmitting protective cover 1 on top of the protective cylinder 2, and supply water to the automatic watering device 3 through the water supply pipeline 4 to form a semi-enclosed microenvironment formed by the light-transmitting protective cover 1 and the protective cylinder 2, which extends deep into the ground and has watering function and sufficient light conditions, providing a good living environment for the growth and development of seedlings 6.

[0058] E. Adjust the direction of the light-collecting window of the light-collecting protective cover 1 according to the lighting conditions. When the direction of the light-collecting window is away from the direction of sunlight, the amount of light entering can be reduced, thereby reducing the illuminance inside the seedling planting protective device. Conversely, the illuminance inside the seedling planting protective device can be increased.

[0059] F. When the root system of seedling 6 is mature and can adapt to the external environment, remove the light-transmitting protective cover 1 to allow seedling 6 to directly contact the outside world and grow freely, thereby achieving the purpose of hardening off the seedling and improving the adaptability of seedling 6 to the external environment.

[0060] G. Once the seedlings 6 have fully adapted to the external environment, remove the protective cylinder 2 and the automatic watering device 3, leaving the deep pit intact, or fill the deep pit to complete the tree planting work.

Claims

1. A device for automatically watering seedling planting, characterized by: The automatic water supply device (3) is composed of a water storage cylinder pipe (303), a water storage cylinder upper cover (302), a locking cap (301), a water storage cylinder lower cover (306), a water inlet pipe (313), a water outlet nozzle (312), a sealing gasket (311), a float valve (309), and a water absorbing material (307). The water storage cylinder upper cover (302) and the water storage cylinder lower cover (306) close the water storage cylinder pipe (303) from both ends to form a cylindrical water storage cylinder. The side of the water storage cylinder pipe (303) is provided with an overflow hole (305) and an exhaust hole (304), and the overflow hole (305) is below the exhaust hole (304). The water inlet pipe (313), the water outlet nozzle (312), the sealing gasket (311), and the float valve (309) constitute a water level controller. The water inlet pipe (313) is inserted into the through hole in the middle of the water storage cylinder upper cover (302) and is locked and fixed on the water storage cylinder upper cover (302) by the locking cap (301). The water outlet nozzle (312) is inserted into the water inlet pipe (313) and combined with the water inlet pipe (313). The float valve (309) is a cylindrical air float with an open lower end and a cylindrical sleeve provided on the upper part. The float valve (309) is provided with a float valve flow guide hole (310) on the cylindrical sleeve, and water flows out through the float valve flow guide hole (310). The sealing gasket (311) is a sheet-shaped circular rubber sealing element installed in the cylindrical sleeve of the float valve (309). The water outlet nozzle (312) is inserted into the cylindrical sleeve of the float valve (309) together with the water inlet pipe (313), and when the lower edge of the water outlet nozzle (312) contacts the sealing gasket (311), the water flow is blocked. The water absorbing material (307) is a variable-diameter cylindrical shape, with the lower half wrapped outside the float valve (309) and the upper half uniformly provided with circular through holes (308).

2. The automatic water application device for seedling planting according to claim 1, characterized in that: The upper half of the water absorbing material (307) is uniformly provided with circular through holes (308) to increase the contact area between the water absorbing material (307) and the air. The water stored in the water storage cylinder is transported upward from the bottom of the water storage cylinder to the upper part of the float valve (309) under the adsorption of the water absorbing material (307).

3. The automatic water application device for seedling planting according to claim 1, characterized in that: The water pressure in the water inlet pipe (313) controls the automatic water supply device (3) to switch between the gaseous water circulation working mode and the direct watering working mode. In the gaseous water circulation working mode, water vapor enters the soil through the overflow hole (305) and the exhaust hole (304) on the side of the water storage cylinder pipe (303). In the direct watering working mode, water flows directly into the soil through the overflow hole (305) on the side of the water storage cylinder pipe (303).

4. A tree planting method using the automatic water application device for seedling according to any one of claims 1 to 3, characterized by: The method comprises the following steps: A. A cylindrical pit with a certain diameter and depth is dug at a location where trees are to be planted, and the automatic water supply device (3) is buried in the soil (5) at the edge of the pit bottom. The side of the automatic water supply device (3) with the overflow hole (305) and the exhaust hole (304) faces the center of the pit, and nutrient soil (7) is added at the bottom of the pit; B. The protective cylinder (2) is placed into the cylindrical pit, with a portion of the protective cylinder (2) exposed above the ground and the surrounding soil filled in. C. In the nutrient soil (7) to plant seedlings, sow seeds, insert cuttings, complete the planting steps; D. The light protection cover (1) is sleeved on the upper of the protection cylinder (2), water is supplied to the automatic water supply device (3) through the water supply pipeline (4), a semi-closed microenvironment surrounded by the light protection cover (1) and the protection cylinder (2) and deep into the ground is formed, which has the water supply function and sufficient light conditions, and provides a good living environment for the growth of seedlings; E. According to the light conditions, the direction of the light window of the light protection cover (1) is adjusted, the direction of the light window is away from the incident direction of sunlight, the number of light incidence can be reduced, and the illumination in the seedling planting protection device can be reduced; F. When the root system of the seedling plant (6) is mature and can adapt to the external environment, the light protection cover (1) is removed, the seedling plant (6) is directly contacted with the outside, the purpose of hardening seedlings is achieved, and the adaptability of the seedling plant (6) to the external environment is improved; G. When the seedling plant (6) completely adapts to the external environment, the protection cylinder (2) and the automatic water supply device (3) are removed, the deep pit is retained, or the deep pit is filled, and the tree planting work is completed.

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