Soilless plant culture system

Abstract

A soilless plant culture system comprises: a container (10) having an enclosed space provided therein, wherein the enclosed space includes a culture region (202) comprising one germination and seedling growth region (2022) and one cultivation and harvest region (2023). The culture region (202) comprises at least one rack system (2022RS), and each rack system (2022RS) is provided with at least one shelf (2022S) to place components capable of accommodating a culture substrate having a plant placed therein.

Description

Soilless cultivation system for plants Technical Field The present invention relates generally to a plant cultivation system, and more specifically, to a soilless plant cultivation system. Background Technology Plants are typically grown in soil and exposed to the atmosphere. However, their growth is greatly affected by the external environment, especially in harsh conditions where growth may cease or the plant may be damaged. In addition, soil pollution can affect plant growth and damage plant quality. Existing hydroponic systems keep plants in one location throughout the cultivation process, meaning they can only be removed after they are fully mature, resulting in low space and time utilization. The nutrient solution and air circulation systems in current hydroponic systems are also very complex, leading to high overall costs. Furthermore, current hydroponic systems typically occupy a large area, making them unsuitable for use in small spaces. Therefore, a soilless cultivation system is needed that can provide the necessary stable environment for plant growth without contamination. Summary of the Invention A first aspect of the present invention provides a soilless plant cultivation system, comprising: A container, the interior of which provides an enclosed space including a cultivation area. The cultivation area includes a germination and seedling growth zone and a cultivation and harvesting zone; and The cultivation area includes at least one rack system, each rack system having at least one shelf to hold components capable of holding the cultivation substrate, in which plants are placed. According to a preferred embodiment of the first aspect of the invention, the germination and seedling growth zone includes a germination zone and a seedling growth zone. According to a preferred embodiment of a first aspect of the invention, the cultivation and harvesting zone includes a cultivation zone and a harvesting zone, wherein the cultivation zone is interposed between the harvesting zones. According to a preferred embodiment of the first aspect of the invention, the growth cycle of the plant in the cultivation zone is the same as the growth cycle in the harvest zone. According to a preferred embodiment of the first aspect of the invention, the germination zone is an opaque box containing a heater. According to a preferred embodiment of the first aspect of the invention, the germination and seedling growth area is provided with at least one support system, and the component in the germination and seedling growth area capable of containing the cultivation substrate is a tray. According to a preferred embodiment of the first aspect of the invention, the cultivation and harvesting area is provided with at least one support system, and the component in the cultivation and harvesting area capable of containing the cultivation substrate is a cultivation trough. According to a preferred embodiment of the first aspect of the invention, the enclosed space further includes a front area. According to a preferred embodiment of the first aspect of the invention, the front area and the cultivation area are airtightly separated from each other. According to a preferred embodiment of the first aspect of the invention, the front area includes a refrigeration device. According to a preferred embodiment of the first aspect of the invention, the front area includes an air purifier and a sterilization device. According to a preferred embodiment of the first aspect of the invention, a workbench area is provided in the front area or the cultivation area. According to a preferred embodiment of the first aspect of the invention, the workbench area is provided with a sink and a retractable faucet. According to a preferred embodiment of the first aspect of the invention, the soilless plant cultivation system further includes an air circulation system disposed in the cultivation area. According to a preferred embodiment of the first aspect of the invention, the air circulation system includes a heating, ventilation, and air conditioning (HVAC) system, an air supply fan, and a circulation duct system, wherein the HVAC system is connected to the air supply fan, and the circulation duct system is connected to the HVAC system. The circulating piping system includes any one of the following three types: a) Multiple first ports are provided in the two opposite sidewalls of the container. b) Multiple first ports are provided on the upper bottom surface of the container. c) A plurality of first ports are disposed at the top of the container and respectively near two opposite side walls of the container, and a plurality of fans are disposed on the two opposite side walls; and The circulating piping system also includes at least one second port, which is located at the top center of the container. According to a preferred embodiment of the first aspect of the invention, when the circulation piping system includes a), the circulation piping system includes a plurality of wall pipes disposed on the two opposite sidewalls, and the plurality of first ports are a plurality of holes disposed in the plurality of wall pipes and in fluid communication with the cultivation area. According to a preferred embodiment of the first aspect of the invention, the plurality of wall tubes include at least one vertical extension and at least one horizontal extension. According to a preferred embodiment of the first aspect of the invention, when the circulation piping system includes b), the circulation piping system includes at least one sidewall extension disposed on the two opposing sidewalls, and the at least one sidewall extension is in fluid communication with the plurality of first ports on the bottom upper surface of the container. According to a preferred embodiment of the first aspect of the invention, when the circulating piping system includes c), the plurality of fans are spaced apart from and angled to one of the two opposing sidewalls. According to a preferred embodiment of a first aspect of the invention, the plurality of fans draw air from the cultivation area toward a corresponding one of the two opposing sidewalls, causing the air to flow upward along the corresponding one of the two opposing sidewalls into the plurality of first ports. According to a preferred embodiment of a first aspect of the invention, the plurality of first ports are return air ports through which air leaves the cultivation area, and the at least one second port is an air inlet through which air enters the cultivation area. According to a preferred embodiment of a first aspect of the invention, the plurality of first ports are air inlets through which air enters the cultivation area, and the at least one second port is an air outlet through which air leaves the cultivation area. According to a preferred embodiment of the first aspect of the invention, the soilless plant cultivation system further includes a fluid circulation system disposed in the cultivation area for providing nutrient solution to the plants. According to a preferred embodiment of the first aspect of the present invention, the fluid circulation system includes an inlet system, a nutrient solution circulation system for the germination and seedling growth zone, and a nutrient solution circulation system for the cultivation and harvesting zone. According to a preferred embodiment of the first aspect of the present invention, the water inlet system includes an inlet pipe, a flow control regulator, a water meter, a booster pump, and at least one water purification system connected in sequence, wherein the inlet pipe is connected to an external water source. According to a preferred embodiment of the first aspect of the present invention, the nutrient solution circulation system for the germination and seedling growth zone provides nutrient solution to the germination and seedling growth zone, comprising: a water tank for the germination and seedling growth zone, multiple nutrient tanks for the germination and seedling growth zone, a pressure pump for the germination and seedling growth zone, at least one fluid delivery pipe for the germination and seedling growth zone, at least one set of fluid inlet pipes for the germination and seedling growth zone, and at least one fluid outlet pipe for the germination and seedling growth zone. The water inlet system supplies water to the water tank in the germination and seedling growth area. The water tank in the germination and seedling growth area is connected to the multiple nutrient tanks in the germination and seedling growth area. The multiple nutrient tanks in the germination and seedling growth area supply nutrients to the water tank in the germination and seedling growth area, thereby forming a nutrient solution in the water tank in the germination and seedling growth area. The pressure pump in the germination and seedling growth zone pumps the nutrient solution from the water tank in the germination and seedling growth zone to at least one fluid delivery pipe in the germination and seedling growth zone. This at least one fluid delivery pipe is connected to at least one set of fluid inlet pipes in the germination and seedling growth zone to deliver the nutrient solution to these pipes. The at least one set of germination and seedling growth zone fluid inlet pipes introduces nutrient solution into the component containing the cultivation substrate, and the at least one germination and seedling growth zone fluid outlet pipe leads the nutrient solution flowing out from the component containing the cultivation substrate to the germination and seedling growth zone water tank. According to a preferred embodiment of the first aspect of the present invention, the nutrient solution circulation system for the germination and seedling growth zone further includes a fluid output pipe for the germination and seedling growth zone, wherein the at least one fluid outlet pipe for the germination and seedling growth zone is connected to the fluid output pipe for the germination and seedling growth zone, and the fluid output pipe for the germination and seedling growth zone is connected to the water tank for the germination and seedling growth zone, for outputting the nutrient solution drawn out by the at least one fluid outlet pipe for the germination and seedling growth zone to the water tank for the germination and seedling growth zone. According to a preferred embodiment of the first aspect of the invention, the nutrient tank in the germination and seedling growth zone includes a tank containing a substance capable of lowering the pH value of the nutrient solution. According to a preferred embodiment of the first aspect of the invention, in the nutrient solution circulation system of the germination and seedling growth zone, the nutrient solution is continuously circulated, periodically circulated, or irregularly circulated. According to a preferred embodiment of the first aspect of the present invention, the nutrient solution circulation system for the cultivation and harvesting area provides nutrient solution to the cultivation and harvesting area, comprising: a cultivation and harvesting area water tank, multiple cultivation and harvesting area nutrient tanks, a cultivation and harvesting area pressure pump, a cultivation and harvesting area fluid delivery pipeline, at least one row of cultivation and harvesting area fluid inlet pipes, and at least one cultivation and harvesting area fluid outlet tank. The water inlet system supplies water to the water tank in the cultivation and harvesting area. The water tank in the cultivation and harvesting area is connected to the plurality of nutrient tanks in the cultivation and harvesting area. The plurality of nutrient tanks in the cultivation and harvesting area supply nutrients to the water tank in the cultivation and harvesting area, thereby forming a nutrient solution in the water tank in the cultivation and harvesting area. The pressure pump in the cultivation and harvesting area pumps the nutrient solution in the water tank of the cultivation and harvesting area to the fluid delivery pipeline of the cultivation and harvesting area. The fluid delivery pipeline of the cultivation and harvesting area is connected to at least one row of fluid inlet pipelines of the cultivation and harvesting area to deliver the nutrient solution to the at least one row of fluid inlet pipelines of the cultivation and harvesting area. Wherein, the at least one row of fluid inlet pipes in the cultivation and harvesting areas introduces nutrient solution into the component containing the cultivation substrate; and The at least one fluid outlet pipe for the cultivation and harvesting area is located below one end of the component containing the cultivation substrate, so as to draw nutrient solution flowing from the component containing the cultivation substrate to the water tank of the cultivation and harvesting area. According to a preferred embodiment of the first aspect of the invention, the nutrient tank in the cultivation and harvesting area includes a tank containing a substance capable of lowering the pH of the nutrient solution. According to a preferred embodiment of the first aspect of the invention, in the nutrient solution circulation system of the cultivation and harvesting area, the nutrient solution is continuously circulated, periodically circulated, or irregularly circulated. According to a preferred embodiment of the first aspect of the invention, a lighting system is also included. According to a preferred embodiment of the first aspect of the invention, the lighting system is disposed above a component of the cultivation substrate. According to a preferred embodiment of the first aspect of the invention, the distance between the lighting system and the plant is adjustable. According to a preferred embodiment of the first aspect of the invention, at least one of the pressure pump in the germination and seedling growth zone and the pressure pump in the cultivation and harvesting zone is turned on 30 minutes before the lighting system is turned on, and turned off 30 minutes after the lighting system is turned off. According to a preferred embodiment of the first aspect of the invention, the container has a top, a bottom, and four side walls, one of which is provided with a door. According to a preferred embodiment of the first aspect of the invention, the upper surface of the bottom has a V-shaped cross-section. According to a preferred embodiment of the first aspect of the invention, the main body of the top, the main body of the bottom, and the main bodies of the four side walls are all made of steel. According to a preferred embodiment of a first aspect of the invention, a layer of insulating material is attached to the lower surface of the body of the bottom, a concrete layer is provided on the upper surface of the body of the bottom, and a floor is covered on the upper surface of the concrete layer. According to a preferred embodiment of the first aspect of the invention, the floor is made of polyvinyl chloride (PVC). According to a preferred embodiment of the first aspect of the invention, a layer of insulating material is attached to the lower surface of the top body, and a partition plate is attached to the lower surface of the insulating material layer. According to a preferred embodiment of the first aspect of the invention, an insulating material layer is attached to the side of the main body of the four sidewalls facing the interior of the container, and an insulating plate is attached to the side of the insulating material layer facing the interior of the container. According to a preferred embodiment of the first aspect of the present invention, the isolation plate has a sandwich structure, wherein the sandwich structure comprises a steel plate, a foam layer and a steel plate in sequence. According to a preferred embodiment of the first aspect of the invention, the soilless plant cultivation system includes a monitoring system and a control system. According to a preferred embodiment of the first aspect of the present invention, the monitoring system includes, but is not limited to: an air temperature sensor, a humidity sensor, a CO2 level sensor, a liquid temperature sensor, a pH sensor, and a dissolved oxygen sensor. According to a preferred embodiment of the first aspect of the invention, the control system includes one or more controllers. According to a preferred embodiment of the first aspect of the invention, the cultivation substrate is a sponge, rock wool, ceramsite, coconut coir, perlite, or vermiculite. According to a preferred embodiment of the first aspect of the invention, the container is a shipping container. According to a preferred embodiment of the first aspect of the invention, the plant is a leafy green vegetable. A second aspect of the present invention provides a soilless plant cultivation system, comprising: a container having an enclosed space inside the container, the enclosed space including a cultivation area; and an air circulation system disposed within the enclosed space. The air circulation system includes a heating, ventilation, and air conditioning (HVAC) system, an air supply fan, and a circulation duct system. The HVAC system is connected to the air supply fan, and the circulation duct system is connected to the HVAC system. The circulating piping system includes any one of the following three types: a) Multiple first ports are provided in the two opposite sidewalls of the container. b) Multiple first ports are provided on the upper bottom surface of the container. c) A plurality of first ports are disposed at the top of the container and respectively near two opposite side walls of the container, and a plurality of fans are disposed on the two opposite side walls; and The circulating piping system also includes at least one second port, which is located at the top center of the container. According to a preferred embodiment of a second aspect of the invention, when the circulation piping system includes a), the circulation piping system includes a plurality of wall pipes disposed on the two opposite sidewalls, and the plurality of first ports are a plurality of holes disposed in the plurality of wall pipes and in fluid communication with the cultivation area. According to a preferred embodiment of a second aspect of the invention, the plurality of wall tubes include at least one vertical extension and at least one horizontal extension. According to a preferred embodiment of a second aspect of the invention, when the circulation piping system includes b), the circulation piping system includes at least one sidewall extension disposed on the two opposing sidewalls, and the at least one sidewall extension is in fluid communication with the plurality of first ports on the bottom upper surface of the container. According to a preferred embodiment of the second aspect of the invention, when the circulating piping system includes c), the plurality of fans are spaced apart from and angled to one of the two opposing sidewalls. According to a preferred embodiment of a second aspect of the invention, the plurality of fans draw air from the cultivation area toward a corresponding one of the two opposing sidewalls, causing the air to flow upward along the corresponding one of the two opposing sidewalls into the plurality of first ports. According to a preferred embodiment of a second aspect of the invention, the plurality of first ports are return air ports through which air leaves the cultivation area, and the at least one second port is an air inlet through which air enters the cultivation area. According to a preferred embodiment of a second aspect of the invention, the plurality of first ports are air inlets through which air enters the cultivation area, and the at least one second port is an air return port through which air leaves the cultivation area. According to a preferred embodiment of the second aspect of the invention, the cultivation area includes a germination and seedling growth area and a cultivation and harvesting area. According to a preferred embodiment of the second aspect of the invention, the germination and seedling growth zone includes a germination zone and a seedling growth zone. According to a preferred embodiment of a second aspect of the invention, the cultivation and harvesting zone includes a cultivation zone and a harvesting zone, wherein the cultivation zone is interposed between the harvesting zones. According to a preferred embodiment of the second aspect of the invention, the growth cycle of the plant in the cultivation zone is the same as the growth cycle in the harvest zone. According to a preferred embodiment of the second aspect of the invention, the germination zone is an opaque box containing a heater. According to a preferred embodiment of the second aspect of the invention, the germination and seedling growth area is provided with at least one support system, and the component in the germination and seedling growth area capable of holding the cultivation substrate is a tray. According to a preferred embodiment of a second aspect of the invention, the cultivation and harvesting area is provided with at least one support system, and the component in the cultivation and harvesting area capable of containing the cultivation substrate is a cultivation trough. According to a preferred embodiment of a second aspect of the invention, the enclosed space further includes a front area. According to a preferred embodiment of the second aspect of the invention, the front area and the cultivation area are airtightly separated from each other. According to a preferred embodiment of a second aspect of the invention, the front area includes a refrigeration unit. According to a preferred embodiment of a second aspect of the invention, the front area includes an air purifier and a sterilization device. According to a preferred embodiment of the second aspect of the invention, a workbench area is provided in the front area or the cultivation area. According to a preferred embodiment of a second aspect of the invention, the workbench area is provided with a sink and a retractable faucet. According to a preferred embodiment of a second aspect of the invention, the soilless plant cultivation system further includes a fluid circulation system disposed in the cultivation area for providing nutrient solution to the plants. According to a preferred embodiment of a second aspect of the invention, the fluid circulation system includes an inlet system, a nutrient solution circulation system for the germination and seedling growth zone, and a nutrient solution circulation system for the cultivation and harvesting zone. According to a preferred embodiment of a second aspect of the present invention, the water inlet system includes an inlet pipe, a flow control regulator, a water meter, a booster pump, and at least one water purification system connected in sequence, wherein the inlet pipe is connected to an external water source. According to a preferred embodiment of the second aspect of the present invention, the nutrient solution circulation system for the germination and seedling growth zone provides nutrient solution to the germination and seedling growth zone, comprising: a water tank for the germination and seedling growth zone, multiple nutrient tanks for the germination and seedling growth zone, a pressure pump for the germination and seedling growth zone, at least one fluid delivery pipe for the germination and seedling growth zone, at least one set of fluid inlet pipes for the germination and seedling growth zone, and at least one fluid outlet pipe for the germination and seedling growth zone. The water inlet system supplies water to the water tank in the germination and seedling growth area. The water tank in the germination and seedling growth area is connected to the multiple nutrient tanks in the germination and seedling growth area. The multiple nutrient tanks in the germination and seedling growth area supply nutrients to the water tank in the germination and seedling growth area, thereby forming a nutrient solution in the water tank in the germination and seedling growth area. The pressure pump in the germination and seedling growth zone pumps the nutrient solution from the water tank in the germination and seedling growth zone to at least one fluid delivery pipe in the germination and seedling growth zone. This at least one fluid delivery pipe is connected to at least one set of fluid inlet pipes in the germination and seedling growth zone to deliver the nutrient solution to these pipes. The at least one set of germination and seedling growth zone fluid inlet pipes introduces nutrient solution into the component containing the cultivation substrate, and the at least one germination and seedling growth zone fluid outlet pipe leads the nutrient solution flowing out from the component containing the cultivation substrate to the germination and seedling growth zone water tank. According to a preferred embodiment of the second aspect of the present invention, the nutrient solution circulation system for the germination and seedling growth zone further includes a fluid output pipe for the germination and seedling growth zone, wherein the at least one fluid outlet pipe for the germination and seedling growth zone is connected to the fluid output pipe for the germination and seedling growth zone, and the fluid output pipe for the germination and seedling growth zone is connected to the water tank for the germination and seedling growth zone, for outputting the nutrient solution drawn out by the at least one fluid outlet pipe for the germination and seedling growth zone to the water tank for the germination and seedling growth zone. According to a preferred embodiment of a second aspect of the invention, the nutrient tank in the germination and seedling growth zone includes a tank containing a substance capable of lowering the pH of the nutrient solution. According to a preferred embodiment of the second aspect of the invention, in the nutrient solution circulation system of the germination and seedling growth zone, the nutrient solution is continuously circulated, periodically circulated, or irregularly circulated. According to a preferred embodiment of a second aspect of the invention, the nutrient solution circulation system for the cultivation and harvesting area provides nutrient solution to the cultivation and harvesting area, and includes: a cultivation and harvesting area water tank, multiple cultivation and harvesting area nutrient tanks, a cultivation and harvesting area pressure pump, a cultivation and harvesting area fluid delivery pipeline, at least one row of cultivation and harvesting area fluid inlet pipes, and at least one cultivation and harvesting area fluid outlet tank. The water inlet system supplies water to the water tank in the cultivation and harvesting area. The water tank in the cultivation and harvesting area is connected to the plurality of nutrient tanks in the cultivation and harvesting area. The plurality of nutrient tanks in the cultivation and harvesting area supply nutrients to the water tank in the cultivation and harvesting area, thereby forming a nutrient solution in the water tank in the cultivation and harvesting area. The pressure pump in the cultivation and harvesting area pumps the nutrient solution in the water tank of the cultivation and harvesting area to the fluid delivery pipeline of the cultivation and harvesting area. The fluid delivery pipeline of the cultivation and harvesting area is connected to at least one row of fluid inlet pipelines of the cultivation and harvesting area to deliver the nutrient solution to the at least one row of fluid inlet pipelines of the cultivation and harvesting area. Wherein, the at least one row of fluid inlet pipes in the cultivation and harvesting areas introduces nutrient solution into the component containing the cultivation substrate; and The at least one fluid outlet pipe for the cultivation and harvesting area is located below one end of the component containing the cultivation substrate, so as to draw nutrient solution flowing from the component containing the cultivation substrate to the water tank of the cultivation and harvesting area. According to a preferred embodiment of a second aspect of the invention, the nutrient tank in the cultivation and harvesting area includes a tank containing a substance capable of lowering the pH of the nutrient solution. According to a preferred embodiment of the second aspect of the invention, in the nutrient solution circulation system of the cultivation and harvesting area, the nutrient solution is continuously circulated, periodically circulated, or irregularly circulated. According to a preferred embodiment of the second aspect of the invention, a lighting system is also included. According to a preferred embodiment of a second aspect of the invention, the lighting system is disposed above a component of the cultivation substrate. According to a preferred embodiment of a second aspect of the invention, the distance between the lighting system and the plant is adjustable. According to a preferred embodiment of the second aspect of the invention, at least one of the pressure pump in the germination and seedling growth zone and the pressure pump in the cultivation and harvesting zone is turned on 30 minutes before the lighting system is turned on, and turned off 30 minutes after the lighting system is turned off. A third aspect of the present invention provides a soilless plant cultivation system, comprising: A container, the interior of which provides a space. The container has at least one fan on one side and at least one hole on the opposite side. According to a preferred embodiment of a third aspect of the invention, the at least one fan draws outside air into the space through the at least one hole. According to a preferred embodiment of the third aspect of the invention, the side where the at least one fan is located also has at least one hole. According to a preferred embodiment of the third aspect of the invention, at least one fan is also provided on the opposite side. According to a preferred embodiment of a third aspect of the invention, the blowing direction of the fan is variable. According to a preferred embodiment of a third aspect of the invention, the space includes a functional component area and a cultivation area, which are spaced apart from each other, wherein the cultivation area includes at least one shelf in which components capable of accommodating cultivation substrate are placed, and plants are placed in the cultivation substrate. According to a preferred embodiment of a third aspect of the invention, the component capable of containing the cultivation substrate is a tray. According to a preferred embodiment of a third aspect of the invention, the soilless plant cultivation system further includes a fluid circulation system comprising a water tank, multiple nutrient tanks, a pressure pump, and fluid flow pipes. The water tank is connected to the plurality of nutrient tanks, and the plurality of nutrient tanks supply nutrients to the water tank to form a nutrient solution in the water tank. The pressure pump pumps the nutrient solution in the water tank to the fluid flow pipe, which then delivers the nutrient solution to the component containing the cultivation substrate and leads the nutrient solution flowing out of the component containing the cultivation substrate back to the water tank. According to a preferred embodiment of a third aspect of the invention, the fluid circulation system is periodic, continuously circulating 24 hours a day, or circulating irregularly. According to a preferred embodiment of a third aspect of the invention, the nutrient tank includes a tank containing a substance capable of lowering the pH value of the nutrient solution. According to a preferred embodiment of a third aspect of the invention, the shelf is provided with a fluid inlet and a fluid outlet. According to a preferred embodiment of a third aspect of the invention, the fluid flow conduit is connected to the fluid inlet, thereby delivering the nutrient solution to the component containing the cultivation substrate; and The fluid flow pipe is also connected to the fluid outlet, through which the nutrient solution flows out from the component containing the cultivation substrate and is led out to the water tank via the fluid flow pipe. According to a preferred embodiment of a third aspect of the invention, the soilless plant cultivation system further includes a light system. According to a preferred embodiment of a third aspect of the invention, the lighting system is positioned above the plant. According to a preferred embodiment of a third aspect of the invention, the distance between the lighting system and the plant is adjustable. According to a preferred embodiment of a third aspect of the invention, the pressure pump is turned on 30 minutes before the lighting system is turned on, and turned off 30 minutes after the lighting system is turned off. According to a preferred embodiment of a third aspect of the invention, the container is a vertical cabinet. According to a preferred embodiment of a third aspect of the invention, the upper part of the cabinet is the cultivation area, and the lower part of the cabinet is the functional component area. According to a preferred embodiment of a third aspect of the invention, the cabinet includes a door. According to a preferred embodiment of a third aspect of the invention, the door is made of glass. According to a preferred embodiment of a third aspect of the invention, the portion of the glass corresponding to the functional component area is coated with metal powder. According to a preferred embodiment of a third aspect of the invention, the cabinet is provided with a plurality of wheels at its bottom. According to a preferred embodiment of a third aspect of the invention, the shelf is provided with a sliding element, such that the shelf can be pulled out of the container. According to a preferred embodiment of a third aspect of the invention, the cultivation substrate is a sponge, rock wool, ceramsite, coconut coir, perlite, or vermiculite. According to a preferred embodiment of a third aspect of the present invention, the container is provided with a wireless access module. The plant cultivation system according to the present invention, through the setting of zones, has proven to significantly increase yield. This plant cultivation system also optimizes the nutrient solution circulation system and the air circulation system, thereby providing the optimal growing environment for plants in a more cost-effective and efficient manner. The lighting system of this plant cultivation system is adjustable, improving light absorption by the plants. Furthermore, the present invention also provides a small-scale plant cultivation system that can be conveniently used in small spaces, such as restaurants and homes. Attached Figure Description The invention will now be explained in more detail with reference to the accompanying drawings and exemplary embodiments, wherein: Figure 1 is an external perspective view of the container of a plant cultivation system according to an embodiment of the present invention. Figure 2 is a cross-sectional view of the container in Figure 1 along line AA. Figure 3 further illustrates a three-dimensional schematic diagram of the floor in Figure 2. Figure 4 is a three-dimensional schematic diagram of the internal space of the container in Figure 1. Figure 5 is a top view of the interior space in Figure 4. Figure 6 shows a block diagram of a water inlet system according to one embodiment of the present invention. Figure 7a shows a perspective view of a nutrient solution circulation system for a germination and seedling growth zone according to an embodiment of the present invention; Figure 7b shows a front view of a nutrient solution circulation system for a germination and seedling growth zone according to an embodiment of the present invention; Figure 7c1 shows a side view of a nutrient solution circulation system for a germination and seedling growth zone according to an embodiment of the present invention; Figure 7c2 shows another side view of a nutrient solution circulation system for a germination and seedling growth zone according to an embodiment of the present invention; Figure 7d shows a top view of a nutrient solution circulation system for a germination and seedling growth zone according to an embodiment of the present invention. Figure 8a shows a perspective view of a nutrient solution circulation system in the cultivation and harvesting area according to an embodiment of the present invention; Figure 8b shows an enlarged schematic diagram of region K in Figure 8a; Figure 8c shows an enlarged schematic diagram of region J in Figure 8a; Figure 8d shows a side view of a portion of Figure 8a. Figure 9 shows a schematic diagram of an air circulation system according to one embodiment of the present invention. Figure 10 shows a schematic diagram of an air circulation system according to another embodiment of the present invention. Figure 11 shows a schematic diagram of an air circulation system according to another embodiment of the present invention. Figure 12 shows a front view of a plant cultivation system according to another embodiment of the present invention. Figure 13 shows a perspective view of the plant cultivation system in Figure 12. Figure 14a shows a top view of the shelf shown in Figure 13. Figure 14b shows a bottom view of the shelf shown in Figure 13. Figure 15 shows a detailed schematic diagram of the bottom of the container of the plant cultivation system in Figure 12. Figure 16a shows a schematic diagram of one embodiment of the fluid delivery pipeline shared by the two bracket systems shown in Figure 8a. Figure 16b shows a schematic diagram of another embodiment of the fluid delivery pipeline shared by the two bracket systems shown in Figure 8a. It should be understood that the accompanying drawings are for illustrative purposes only and should not be considered as limiting the invention. Detailed Implementation Various embodiments of the present invention are further described below with reference to the accompanying drawings. In all the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. It should be understood that the embodiments described below with reference to the accompanying drawings are merely exemplary and intended to explain the present invention, and are not intended to limit the present invention. Figure 1 is an external perspective view of a container 10 of a plant cultivation system according to an embodiment of the present invention. As shown in Figure 1, the container 10 is generally rectangular, but it should be understood that other suitable shapes are also possible, such as a cube. In this embodiment, the container 10 is a shipping container, preferably without any external protruding parts, and the container as a whole conforms to shipping standards, thus ensuring maximum protection during transportation, operation, and maintenance. As shown in Figure 1, the container 10 includes a top 101, a bottom 102, and four side walls 103. A door 104 is provided in one of the side walls. Figure 2 is a cross-sectional view of the container 10 in Figure 1 along line AA. Figure 2 shows the specific structure of the top 101, bottom 102, and the two side walls 103 of the container 10. As shown in Figure 2, the main body 3 of the top 101, bottom 102, and side walls 103 is made of steel to provide structural strength. As explained below, several other layers are also provided in the top 101, bottom 102, and side walls 103 to provide additional functionality. The lower surface of the main steel plate of the bottom 102 can be sprayed with a 30mm thick insulating material layer 1. This insulating material serves to block heat transfer; it can be polyurethane (PU). It should be understood that the thickness of this insulating material layer is not limited to this, and the insulating material is not limited to polyurethane; other suitable methods can be used to apply other insulating materials. The upper surface of the main steel plate of the bottom 102 can be covered with a 25mm thick concrete layer 4. Concrete improves durability, extends service life, and ensures stability during transportation and daily operation. It should be understood that the thickness of the concrete layer is not limited to this, and other methods can be used to apply other materials that can improve durability. The upper surface of the concrete layer is covered with a 1.8mm thick polyvinyl chloride (PVC) flooring 5, which can extend upwards to a certain distance on both side walls. This PVC material is non-slip and waterproof, and can be non-white, such as blue, to prevent reflection and prevent light from being reflected into the eyes of workers. Similarly, it should be understood that the upper part of the concrete layer can be covered with other materials, and the thickness of the materials is not limited to 1.8mm. Similarly, the lower surface of the top 101 (i.e., the surface facing the interior of the container 10) and the inner surfaces of the two side walls 103 (i.e., the surfaces facing the interior of the container 10) are coated with a 30 mm thick layer of insulating material. This insulating material can be polyurethane (PU). It should be understood that the thickness of the insulating material layer is not limited to this, and the insulating material is not limited to polyurethane; other suitable methods can be used to apply other insulating materials. These insulating material layers allow the system's heat capacity to be maintained at a preset value, ensuring that environmental conditions do not fluctuate significantly throughout the day. As shown in Figure 2, a partition plate 2 is also provided on the top 101 and the side wall 103. This partition plate has a sandwich structure: a 0.5mm thick galvanized steel plate + a 49mm thick polyurethane foam layer + a 0.5mm thick galvanized steel plate. It should be understood that the thickness and form of the partition plate are not limited to this; other suitable materials and forms are feasible. This partition plate can further provide thermal insulation, and other components can be mounted on it. Furthermore, a portion of the light emitted by the light source can be reflected back into the interior space of the container 10 by the partition plate, improving light utilization. Although Figure 2 only shows the structure of two of the sidewalls, it should be understood that the structures of the other two sidewalls are the same as those shown in Figure 2. Furthermore, Figure 2 also shows the shape of the PVC flooring. As shown in Figure 2, the PVC flooring has a V-shaped cross-section, meaning it is high on both sides and low in the middle. The advantage of the sloping floor is that when water leaks inside the container 10, the water will accumulate in the sloping area and then be drained to the outside of the container 10 through the drainage system, thus preventing water accumulation inside the container 10. The angle between the two sloping portions of the V-shaped floor and the horizontal plane is preferably 1 to 2°. Figure 3 further illustrates a three-dimensional diagram of the floor. As shown in Figure 3, the floor is inclined in cultivation zone 202 (described below). It should be understood that the floor may also be inclined in front zone 201 (described below). Figure 4 is a three-dimensional schematic diagram of the internal space 20 of container 10 in Figure 1. As shown in Figure 4, the internal space 20 is divided into two parts along its length: a front area 201 and a cultivation area 202. The cultivation area 202 includes a workbench area 2021, a germination and seedling growth area 2022, and a cultivation and harvesting area 2023. These areas are shown in detail in Figure 5, which is a top view of the internal space 20 in Figure 4. In Figure 5, the upper right part of the cultivation area is the workbench area 2021, the lower right part is the germination and seedling growth area 2022, and the left half is the cultivation and harvesting area 2023. Compared to the cultivation area 202, the front area 201 is smaller and relatively independent of the cultivation area 202. The front area 201 provides refrigeration and pest control functions. Refrigeration equipment, such as a refrigerator, can be installed in the front area 201 to preserve harvested plants. The front area 201 also includes an air purifier, such as a UV-C air purifier, and a sterilization device. In this front area 201, harmful substances such as pests, pollutants, dust, bacteria, viruses, microorganisms, and other airborne particles can be removed, minimizing the risk of contamination of the cultivation area 202 by these harmful substances and maximizing plant yield. The following will provide a detailed introduction to cultivation area 202. As shown in Figures 4 and 5, the cultivation area 202 is airtightly separated from the front area 201, for example, by a door that can seal the cultivation area, which is provided to provide space for plant growth. The workbench area 2021 in cultivation area 202 provides a platform for preparatory work before the growth of vegetables and other plants, as well as related processing work after harvesting. As shown in Figure 4, workbench area 2021 is equipped with a water tank WT, where workers can clean equipment, prepare nutrient solutions, select seeds, clean and / or prepare plants, and perform basic maintenance. A pull-out faucet F is located next to the water tank. A water purifier, booster pump, etc., can be installed below workbench area 2021 (details to be provided later). (As shown in the diagram), the functions of the water purifier and booster pump, etc., will be explained below. It should be understood that the work area can also be located in the front area and may include other components. Sowing can be performed in the workbench area 2021. The process involves placing the seeds in the growing medium and then watering them using the extendable water tap. The growing medium can be sponge, rock wool, LECA (expanded clay aggregate), coconut coir, perlite, vermiculite, etc. Sowing in the workbench area facilitates the handling of the growing medium. The relative positions of the workbench area 2021 with the germination and seedling growth area 2022 and the cultivation and harvesting area 2023 are preferably such that workers can move from the workbench area 2021 to the germination and seedling growth area 2022 and the cultivation and harvesting area 2023 in a single direction, thereby saving labor. As shown in Figure 4, the germination and seedling growth area 2022 is equipped with a rack system 2022RS. This rack system has four shelves 2022S, with trays placed on the bottom three shelves, in which the culture medium is placed. For clarity, the trays are not shown in the figure. The top shelf does not have trays; a lighting system is only provided at the bottom of the shelf, which will be described below. It should be understood that the top shelf can be omitted, and the lighting system can be otherwise attached to the rack system. It should be understood that the number of rack systems can be greater than one, and the number of shelves in each rack system is not limited to that shown in the figure. Furthermore, the spacing between the shelves is adjustable, thus the number of shelf layers within a single rack system is variable. The germination and seedling growth zone 2022 may include a germination zone 2022a and a seedling growth zone 2022b, used for the germination and seedling growth of plants such as vegetables, respectively. As schematically shown in Figure 4, the germination zone 2022a is below the seedling growth zone 2022b, but it should be understood that the relative positions of the germination zone 2022a and the seedling growth zone 2022b are not limited to this. In the germination zone 2022a, seeds do not require light and require higher temperatures and humidity than in the seedling growth zone and the cultivation and harvesting zone. This germination zone 2022a may be an opaque box containing a heater. The germination zone 2022a and the seedling growth zone 2022b are distinguished because the conditions required by the plant during these two growth processes are different. After the seeds germinate in germination zone 2022a, the cultivation substrate is transferred to seedling growth zone 2022b, where vegetables and other plants grow into seedlings. The electrical conductivity (EC) of the nutrient solution in seedling growth zone 2022b can be 50% to 75% of the electrical conductivity of the nutrient solution in cultivation and harvesting zone 2023. The cultivation and harvesting area 2023 has four rack systems 2023RS. Each rack system 2023RS has five shelves 2023S. It should be understood that other suitable numbers of rack systems and shelves are also feasible. Multiple elongated cultivation troughs are arranged side-by-side at intervals above the lower four shelves, and the culture medium is placed in these troughs. For clarity, only the cultivation troughs are shown on the shelves of one of the rack systems in Figure 4. The uppermost shelf does not have cultivation troughs; only a lighting system is provided at the bottom of the shelf, which will be described below. It should be understood that the uppermost shelf can be omitted, and the lighting system can be otherwise attached to the rack system. Furthermore, the spacing between the shelves is adjustable, so the number of shelf layers within a single rack system is variable. Each culture tank can be referred to as a cultivation and harvesting zone, and all culture tanks together form the overall cultivation and harvesting zone 2023. Figure 4 schematically illustrates that for culture tanks in one shelf, the cultivation and harvesting zone includes cultivation zone 2023a and harvesting zone 2023b, used to cultivate seedlings into mature plants. It should be understood that for other culture tanks in other shelves, the cultivation and harvesting zone also includes cultivation zone 2023a and harvesting zone 2023b. Seedlings grown in seedling growth area 2022b are first transferred to cultivation area 2023a. After being cultivated in cultivation area 2023a for a period of time, the cultivation substrate is transferred to harvest area 2023b. Vegetables and other plants can be harvested after growing for a period of time in harvest area 2023b. The growth cycles of plants in cultivation zone 2023a and harvest zone 2023b can be the same, as shown in Figure 4, with cultivation zone 2023a interspersed between harvest zones 2023b. The number of plants in the cultivation zone is the same as the number of plants in the harvest zone. The relative positions of the cultivation and harvest zones allow workers to easily move plants from the cultivation zone to the harvest zone, thus saving manpower. Compared to systems that only include a seedling zone and a finishing zone, introducing a nursery zone can increase yield. With the germination zone, seedling zone, nursery zone, and finishing zone configured as described above, all stages of plant growth can be carried out continuously, while subsequent plants can be introduced without interruption, achieving uninterrupted planting and harvesting and improving efficiency. It should be understood that the diagrams of the above areas are illustrative only and not restrictive. For example, the workbench area may be located in the front area instead of the cultivation area. Figures 6 to 8 show schematic diagrams of a fluid circulation system according to one embodiment of the present invention. According to one embodiment of the present invention, the fluid circulation system includes three subsystems: an inlet water system, a nutrient solution circulation system for the germination and seedling growth zone, and a nutrient solution circulation system for the cultivation and harvesting zone. These three subsystems are illustrated below with reference to Figures 6 to 8. Figure 6 shows a block diagram of a water inlet system 60 according to an embodiment of the present invention. The water inlet system 60 can be located below the water tank WT in the workbench area 2021. As shown in Figure 6, the water inlet system includes an inlet pipe WI connected to an external water source, a flow control regulator V, a water meter M, a booster pump P, and at least one water purification system WP (two are shown in the figure). The flow control regulator can be a manual inlet flow valve, which controls the inflow of water, ensuring control of manual over-limits and preventing any potential water delivery problems. The water meter can be any inlet water meter, providing accurate information about water usage. The booster pump can be a 100W pressure-sensing automatic booster pump, ensuring that the internal water delivery pipes are accurately pressurized to deliver water to where it is needed. The water purification system can be a 25-micron PP mesh carbon filter and a 5-micron PP mesh sediment filter. The water purification system ensures that the quality of the water used by the internal system is maintained at an acceptable and safe level, preventing harm from aquatic contaminants and chemicals. Water flowing from the water purification system flows through wall-mounted pipes installed under the floor to water tanks in the germination and seedling growth area 2022 and the cultivation and harvesting area 2023. The wall-mounted pipes are polypropylene water delivery pipes embedded in the floor, with external quick-connect water delivery inlets. The installation of wall-mounted pipes saves space, prevents safety issues, and facilitates water supply and drainage. It should be understood that the water supply system can be installed in any suitable location and does not necessarily include the described components; for example, some components may be omitted or included. Figure 7a shows a perspective view of a nutrient solution circulation system for the germination and seedling growth area according to an embodiment of the present invention; Figure 7b shows a front view of a nutrient solution circulation system for the germination and seedling growth area according to an embodiment of the present invention; Figure 7c1 shows a side view of a nutrient solution circulation system for the germination and seedling growth area according to an embodiment of the present invention; Figure 7c2 shows another side view of a nutrient solution circulation system for the germination and seedling growth area according to an embodiment of the present invention; Figure 7d shows a top view of a nutrient solution circulation system for the germination and seedling growth area according to an embodiment of the present invention. The nutrient solution circulation system for the germination and seedling growth area shown in Figure 7a includes: a water tank 701, multiple nutrient tanks 702, a pressure pump (not shown), multiple fluid delivery pipes 703, multiple sets of fluid inlet pipes 704, multiple fluid outlet pipes 705, and a fluid output pipe 706. In Figures 7a to 7d, one fluid delivery pipe 703, two sets of fluid inlet pipes 704, and two sets of fluid outlet pipes 705 are provided for each shelf level. The number of fluid inlet pipes 704 is related to the number of trays on the shelf. As shown in Figure 7a, each row of trays on each shelf level is provided with one set of fluid inlet pipes 704. Each fluid delivery pipe 703 branches into two branches at each level, each branch connecting to one set of... Fluid inlet pipe 704. Each set of fluid inlet pipes may include at least one thin tube, and the fluid inlet pipes are positioned above the trays of the corresponding layer. Fluid outlet pipes are connected to fluid output pipes. The advantage of setting up fluid output pipes 706 is that multiple fluid outlet pipes can be connected to it, that is, the nutrient solution can be returned to the water tank through a single component, instead of having multiple fluid outlet pipes connected to the water tank separately. This is particularly advantageous in cases with multiple shelves and multiple rows of trays. When the nutrient solution circulation system in the germination and seedling growth zone is just starting to operate, the water tank 701 contains only water flowing in from the water inlet system 60. At this time, the EC sensor installed in the water tank 701 senses that the EC in the water tank 701 is less than the lower limit value, and the nutrient tank 702 above the water tank 701 begins to deliver nutrients to the water tank 701. At this time, the water mixed with nutrients, i.e., the nutrient solution, is pushed upward from the water tank 701 by the pressure pump to the fluid delivery pipe 703, and then flows through the fluid inlet pipe 704 to the trays on the shelf. The bottom of the tray has holes. After the nutrient solution is absorbed by the plants, any remaining nutrient solution flows through these holes into a fluid outlet pipe 705. The fluid outlet pipe 705 is connected to a fluid output pipe 706, through which the nutrient solution flows back to the water tank 701. The nutrient solution then circulates along this path: fluid is pumped from the water tank to a fluid delivery pipe; the fluid inlet pipe delivers the nutrient solution from the fluid delivery pipe to the tray for absorption by the plants; the remaining nutrient solution flows out of the tray to the fluid outlet pipe; the nutrient solution flowing out of the fluid outlet pipe flows to the fluid output pipe, and then back to the water tank. The nutrient solution in this germination and seedling growth zone nutrient solution circulation system can circulate continuously or periodically / irregularly. Furthermore, compared to a static nutrient solution cultivation system, the circulation of the nutrient solution facilitates air dissolution and inhibits the growth of harmful substances, thus promoting plant growth. A float valve is installed inside the water tank 701 to automatically control the water volume. When the water level is below a certain level, the float valve opens, and the water inlet system 60 supplies water to the water tank 701. In addition, an EC sensor inside the water tank 701 continuously monitors the EC value. When the EC value is below a lower limit, the nutrient tank begins to supply nutrients to the water tank 701. This lower limit varies for different plants. Besides the EC sensor, the water tank 701 may also contain a pH sensor, a water temperature sensor, and a dissolved oxygen sensor. The pH sensor monitors the pH value of the nutrient solution in the water tank 701. If the pH of the nutrient solution in the water tank 701 exceeds a predetermined value or the upper limit of a predetermined range, the nutrient tank 702 will supply an acidic substance to lower the pH of the nutrient solution, causing the pH to drop to the lower limit of the predetermined value or range. For example, when the pH reaches above 6.5, the nutrient tank 702 will supply an acidic substance to the water tank 701 to lower the pH, causing the pH of the nutrient solution to drop below 6.5. A water temperature sensor detects the temperature of the nutrient solution in the water tank 701. A cooler can be installed next to the water tank 701. When the water temperature sensor detects that the temperature of the nutrient solution in the water tank 701 is too high, the cooler can lower the temperature of the nutrient solution in the water tank 701. A dissolved oxygen sensor detects the dissolved oxygen content of the nutrient solution in the water tank 701. When the dissolved oxygen content is too low, air can be added to the water tank 701 using an air pump. The nutrient tank 702 shown in Figures 7a and 7b comprises three tanks. Two of these tanks contain nutrients for plant growth and open when nutrients need to be supplied to the water tank 701. Placing nutrients in different tanks prevents different nutrients from reacting in the same tank. The third tank contains the acidic substance described above for lowering the pH. This tank opens when the pH sensor detects that the pH of the nutrient solution in the water tank 701 is too high. It should be understood that the number of nutrient tanks 702 is not necessarily three. It should be understood that the number and form of the various components described above with respect to Figures 7a to 7d are not limited to those described in this specification and the accompanying drawings, but can vary according to actual needs. Furthermore, not all of the above components are necessary; for example, fluid output pipes may not be provided; for example, a single bracket system may have only one fluid delivery pipe, with branches extending from this pipe at each shelf level; and for example, the fluid delivery pipe and multiple sets of fluid inlet pipes may be integrated. Figure 8a shows a perspective view of a nutrient solution circulation system in the cultivation and harvesting area according to one embodiment of the present invention; Figure 8b shows an enlarged schematic diagram of region K in Figure 8a; Figure 8c shows an enlarged schematic diagram of region J in Figure 8a; Figure 8d shows a side view of a portion of Figure 8a. Two side-by-side support systems are shown in Figure 8a, one of which is not shown with a shelf for clarity. As shown in Figure 8a, the nutrient solution circulation system for the cultivation and harvesting area includes: a water tank 801, multiple nutrient tanks 802, at least one pressure pump (not shown), a fluid delivery pipe 803, multiple rows of fluid inlet pipes 804, and multiple fluid outlet pipes 805. As shown in Figure 8a, the two rack systems share the water tank, nutrient tanks, and pressure pump; this design is preferred as it saves components. However, it should be understood that the water tank, nutrient tank, and pressure pump can be set separately for each rack system. Figure 8c also shows that a valve V can be installed at the connection between each row of fluid inlet pipes 804 and the fluid delivery pipe 803, thereby controlling which shelves' cultivation tanks are supplied with nutrient solution. While Figure 8a shows two rack systems side-by-side, it should be understood that the nutrient solution circulation system setup is similar for other rack systems. As shown in Figures 16a and 16b, two or more side-by-side bracket systems may share a fluid delivery conduit 803, which includes a horizontal section and at least two vertical sections 1608 and 1609. One end of each of the at least two vertical sections is connected to a pressure pump and placed in a water tank 801, and the other end is connected to the horizontal section. A first valve 1601 is arranged on the horizontal section portion between the at least two vertical sections. In one embodiment, each of the two vertical sections is equipped with one-way valves 1602 and 1603, and the first valve 1601 is a manual valve. Typically, the two vertical sections of the fluid delivery pipeline can supply water from the tank to different bracket systems separately. However, when one vertical section fails or is damaged and unable to supply water, the other vertical section can simultaneously supply water to two or more parallel bracket systems. In another alternative embodiment, each of the two vertical sections is equipped with solenoid valves 1604 and 1605 and flow sensors 1606 and 1607 connected thereto, and the first valve 1601 in the horizontal section can also be a solenoid valve. Under normal circumstances, both solenoid valves in the vertical sections are simultaneously open. When one of the vertical sections malfunctions or is damaged and unable to supply water, the flow sensor in that vertical section will detect the change in flow rate and send a signal to the relevant electronic control unit to close the solenoid valve in that vertical section and open the first valve in the horizontal section, allowing fluid to be supplied simultaneously from the opposite vertical section to the two side-by-side bracket systems. Each row of fluid inlet pipes corresponds to one shelf, and the number of fluid inlet pipes in a row corresponds to the number of culture tanks placed on each shelf. A fluid outflow trough is located directly below one end of each culture tank on the shelf. Similar to the nutrient solution circulation system in the germination and seedling growth areas, when the nutrient solution circulation system in the cultivation and harvesting areas first starts operating, the water tank 801 contains only water flowing in from the inlet system 60. At this time, the EC sensor installed in the water tank 801 detects that the EC value in the water tank 801 is lower than the lower limit. The nutrient tank 802 above the water tank 801 begins to supply nutrients to the water tank 801. Then, the water mixed with nutrients, i.e., the nutrient solution, is pushed upwards from the water tank 801 by a pressure pump to the fluid delivery pipe 803, and then flows through the fluid inlet pipe 804 to the culture tanks on the shelf. A fluid outlet trough 805 is located directly below one end of each cultivation tank. Residual nutrient solution after absorption by the plants flows from the cultivation tank to the fluid outlet trough 805, and then back to the water tank 801. As shown in Figure 8d, the height of the cultivation tank at the end near the water tank is lower than the height at the other end, allowing the nutrient solution to flow through the cultivation tank before reaching the fluid outlet trough 805. The nutrient solution then circulates along the aforementioned path: it is pumped from the water tank to the fluid delivery pipe, then flows into the cultivation tank through the fluid inlet pipe, flows out of the cultivation tank to the fluid outlet trough, and finally returns to the water tank. This nutrient solution circulation system covers the cultivation and harvesting areas. The nutrient solution in the culture tank can be continuously circulated or circulated periodically / irregularly. Furthermore, compared to a static nutrient solution cultivation system, the circulation of the nutrient solution facilitates air dissolution and inhibits the growth of harmful substances, thus promoting plant growth. The design of the fluid outlet tank 805 is advantageous, avoiding the need for a separate fluid outlet conduit to the water tank 801 for each culture tank, thereby simplifying the structure. A float valve is installed inside water tank 801 to automatically control the water volume. When the water level is below a certain point, the float valve opens, and the water inlet system 60 supplies water to water tank 801. In addition, an EC sensor inside water tank 801 continuously monitors the EC value. When the EC value is below a lower limit, the nutrient tank begins to supply nutrients to water tank 801. This lower limit varies for different plants. Besides the EC sensor, water tank 801 may also be equipped with a pH sensor, a water temperature sensor, and a dissolved oxygen sensor. The pH sensor monitors the pH value of the nutrient solution in water tank 801. If the pH of the nutrient solution in water tank 801 exceeds a predetermined value or the upper limit of a predetermined range, the nutrient tank 702 will supply an acidic substance to water tank 801 to lower the pH, causing the pH of the nutrient solution to drop below the predetermined value or the lower limit of a predetermined range. For example, when the pH reaches above 6.5, the nutrient tank 702 will supply an acidic substance to the water tank 701 to lower the pH, causing the pH of the nutrient solution to drop below 6.5. A water temperature sensor detects the temperature of the nutrient solution in the water tank 801. A cooler can be installed next to the water tank 801. When the water temperature sensor detects that the temperature of the nutrient solution in the water tank 801 is too high, the cooler can lower the temperature of the nutrient solution in the water tank 801. A dissolved oxygen sensor detects the dissolved oxygen content of the nutrient solution in the water tank 801. When the dissolved oxygen content is too low, air can be added to the water tank 801 using an air pump. Similarly, the nutrient tank 802 shown in Figures 8a and 8b comprises three tanks. Two of these tanks contain nutrients for plant growth and open when nutrients need to be supplied to the water tank 801. Placing nutrients in different tanks prevents different nutrients from reacting in the same tank. The third tank contains the acidic substance described above for lowering the pH. This tank opens when the pH sensor detects that the pH of the nutrient solution in the water tank 801 is too high. It should be understood that the number of nutrient tanks 802 is not necessarily three. It should be understood that the number and form of the various components described above with respect to Figures 8a to 8d are not limited to those described in this specification and the accompanying drawings, but can vary according to actual needs. Furthermore, not all of the above components are necessary; for example, fluid delivery pipes and multiple sets of fluid inlet pipes can be integrated. Figure 9 shows a schematic diagram of an air circulation system 90 according to one embodiment of the present invention. As shown in Figure 9, an air supply fan (not shown) is provided in the cultivation area. This air supply fan is located in the side wall and supplies outside air to the interior of the container 10. The air supply fan is in fluid communication with the HVAC system, thereby supplying air to the HVAC system. The air supply fan may be installed together with an air filter to filter out contaminants such as bacteria from the outside air. The air circulation system 90 also includes a heating, ventilation, and air conditioning (HVAC) system, a first ventilation duct 901a, a second ventilation duct 901b, a third ventilation duct 901c, a fourth ventilation duct 901d, a first controller 902a, a second controller 902b, and a third controller 902c. These components can be embedded in the side walls and top of the container for an aesthetically pleasing effect. The first ventilation duct 901a, the second ventilation duct 901b, and the third ventilation duct 901c are all in fluid communication with the HVAC system, and the first ventilation duct 901a, the second ventilation duct 901b, and the third ventilation duct 901c are all in fluid communication with the fourth ventilation duct 901d. The first controller 902a is located at the connection between the first ventilation duct 901a and the fourth ventilation duct 901d, the second controller 902b is located at the connection between the second ventilation duct 901b and the fourth ventilation duct 901d, and the third controller 902c is located at the connection between the third ventilation duct 901c and the fourth ventilation duct 901d. The lower part of the first ventilation duct 901a may have an opening grille, thereby communicating with the interior of the container 10. The opening grille may be distributed along the entire length of the ventilation duct, so that air is distributed to the maximum extent throughout the internal system. The opening grille may be adjustable. Multiple wall tubes 903 (903b and 903c as shown) are provided in the two side walls of container 10. These wall tubes may include at least one vertical extension and at least one horizontal extension. These wall tubes have multiple holes H on the side facing the interior of container 10, as clearly seen in wall tube 903b (multiple holes exist on the surfaces of the two side walls facing the interior of the container, and these holes correspond to the holes in the wall tubes). The fourth ventilation duct is in fluid communication with these wall tubes. Preferably, these wall tubes are designed such that the airflow increases the further the wall tubes are located from the fourth ventilation duct, which can be achieved by selecting the size of the holes and the cross-sectional area of ​​the tubes. This air circulation system 90 can provide at least several air circulation modes, which will be described below: (1) When the second controller 902b is working, the HVAC sends the air supplied by the air supply fan through the second ventilation duct 901b and the fourth ventilation duct 901d to the wall tube 903b in the side wall near the second ventilation duct 901b. The air flows into the interior of the container 10 through the hole in the wall tube 903b. When the air flows to the other side wall, it enters the wall tube 903c in the side wall through the hole in the wall tube 903c. The third controller 902c is also working. The air flows from the wall tube 903c through the fourth ventilation duct 901d to the third ventilation duct 901c and then back to the HVAC, forming an air circulation. (2) In the opposite direction to mode (1), the third controller 902c works, and the HVAC sends the air supplied by the air supply fan through the third ventilation duct 901c and the fourth ventilation duct 901d to the wall tube 903c in the side wall near the third ventilation duct 901c. The air flows into the interior of the container 10 through the holes in the wall tube 903c. When the air flows to the other side wall, it enters the wall tube 903b in the side wall through the holes in the wall tube 903b. The second controller 902a also works, and the air flows from the wall tube 903b through the fourth ventilation duct 901d to the second ventilation duct 901b, and then returns to the HVAC, forming an air circulation. (3) When the second controller 902b is working, the HVAC sends the air supplied by the air supply fan through the second ventilation duct 901b and the fourth ventilation duct 901d to the wall tube 903b in the side wall near the second ventilation duct 901b. The air flows into the interior of the container 10 through the holes in the wall tube 903b. At the same time, the third controller 903c is working, and the HVAC sends the air supplied by the air supply fan through the third ventilation duct 901c and the fourth ventilation duct 901d to the wall tube 903c in the side wall near the third ventilation duct 901c. The air flows into the interior of the container 10 through the holes in the wall tube 903c. When the first controller 902a is working, it draws the air blown into the interior of the container 10 from the wall tubes 903b and 903c into the first ventilation duct 901a and then back to the HVAC, forming an air circulation. (4) In contrast to mode (3), the first controller 902a operates, and the HVAC pushes the air supplied by the air supply fan into the interior of the container 10 through the first ventilation duct 901a. The air enters the wall duct 903 through the holes on the wall duct 903b and the wall duct 903c. Then the second controller 902a and the third controller 903c operate, and the air enters the second ventilation duct 901b and the third ventilation duct 901c from the wall duct 903b and the wall duct 903c through the fourth ventilation duct 901d, and then returns to the HVAC, forming an air circulation. Multiple air circulation modes allow you to select the appropriate mode according to your actual needs. Figure 10 shows a schematic diagram of an air circulation system 100 according to another embodiment of the present invention. Similar to the air circulation system 90, the air circulation system 100 also includes an air supply fan (not shown), which may be located on a side wall 103. This air supply fan supplies outside air to the interior of the container 10. The air supply fan is in fluid communication with the HVAC system, thereby supplying air to the HVAC system. The fan may be installed in conjunction with an air filter to filter out contaminants such as bacteria from the outside air. The air circulation system 100 also includes a heating, ventilation, and air conditioning (HVAC) system, a first ventilation duct 1001a, a second ventilation duct 1001b, a third ventilation duct 1001c, and multiple wall fans F. The HVAC system is in fluid communication with the first ventilation duct 1001a, the second ventilation duct 1001b, and the third ventilation duct 1001c. The wall fans are suspended from the side walls, and their number may be related to the number of trays or culture tanks. The lower portions of the first ventilation duct 1001a, the second ventilation duct 1001b, and the third ventilation duct 1001c may each have open grilles communicating with the interior of the container 10. The open grilles may be distributed along the entire length of these ventilation ducts to maximize air distribution throughout the internal system. The open grilles may be adjustable. In the air circulation system, the HVAC system supplies air into the container 10 through the first ventilation duct 1001a. The wall fans F on both sides pull the air towards the side walls, causing the air flowing towards the side walls to rise and then return to the HVAC system through the second ventilation duct 1001b and the third ventilation duct 1001c, respectively, thus forming an air circulation. Furthermore, the HVAC system can also blow air towards fan F1 through the third ventilation duct 1001c and towards fan F2 through the second ventilation duct 1001b. Fans F1 and F2 push the air into the container 10, and then it returns to the HVAC system through the first ventilation duct 1001a, forming an air circulation. Multiple wall fans are installed in two opposing side walls. The fans in each side wall are spaced apart and arranged at an angle to the side wall. These fans draw air from the cultivation area towards the two side walls, causing the air to flow upwards along the side walls into the second ventilation duct 1001b and the third ventilation duct 1001c. The second and third ventilation ducts 1001b and 1001c can serve as return vents, through which air leaves the cultivation area, and the first ventilation duct 1001a serves as an intake vent, through which air enters the cultivation area. Alternatively, the second and third ventilation ducts 1001b and 1001c can also serve as intake vents, through which air leaves the cultivation area, and the first ventilation duct 1001a serves as a return vent, through which air enters the cultivation area. The fans F1 and F2 on both sides ensure that the plants receive a uniform wind intensity, allowing plants in different locations to grow at the same rate; at the same time, the use of wall fans can improve air circulation, so as to make the atmospheric environment within the entire system the same. Figure 11 shows a schematic diagram of an air circulation system 110 according to another embodiment of the present invention. Within the cultivation area, an air supply fan (not shown) is provided on a side wall 103, which supplies outside air to the interior of the container 10. The air supply fan is in fluid communication with the HVAC system, thereby supplying air to the HVAC system. The fan may be installed together with an air filter to filter out contaminants such as bacteria from the outside air. The air circulation system 110 also includes a heating, ventilation, and air conditioning (HVAC) system, a first ventilation duct 1101a, a second ventilation duct 1101b, a third ventilation duct 1101c, a fourth ventilation duct 1101d, a first controller 1102a, a second controller 1102b, and a third controller 1102c. The HVAC system is in fluid communication with the first ventilation duct 1101a, the second ventilation duct 1101b, and the third ventilation duct 1101c. The first ventilation duct 1101a, the second ventilation duct 1101b, the third ventilation duct 1101c, and the fourth ventilation duct 1101d are also in fluid communication. The first controller 1102a is located at the connection between the first ventilation duct 1101a and the fourth ventilation duct 1101d, the second controller 1102b is located at the connection between the second ventilation duct 1101b and the fourth ventilation duct 1101d, and the third controller 1102c is located at the connection between the third ventilation duct 1101c and the fourth ventilation duct 1101d. The lower part of the first ventilation duct 1101a may have an open grille, thereby communicating with the interior of the container 10. The open grille may be distributed along the entire length of the ventilation duct, so that air is distributed to the maximum extent throughout the internal system. The open grille may be adjustable. The air circulation system 110 differs from the air circulation system 90 in that it does not have a wall duct 903, but instead has multiple holes 1103 on the upper surface of the floor. The fourth ventilation duct 1101d extends along the side wall and is in fluid communication with the multiple holes 1103 on the bottom upper surface of the container. In this air circulation system 110, the second controller 1102b and the third controller 1102c operate. The HVAC system delivers air supplied by the air supply fan to the floor via the second ventilation duct 1101b and the third ventilation duct 1101c, and then via the fourth ventilation duct 1101d. The air then flows through multiple holes 1103 into the interior of the container 10. At this time, the first controller 1102a operates, drawing the air flowing from the multiple holes 1103 into the first ventilation duct 1101a, and then back to the HVAC system, forming an air circulation. Alternatively, the HVAC system delivers air into the interior of the container 10 via the first ventilation duct 1101a. The air then enters the fourth ventilation duct 1101d through holes in the floor surface, then enters the second ventilation duct 1101b and the third ventilation duct 1101c, and finally returns to the HVAC system, forming an air circulation. The various pipes in Figures 9 to 11 are isolated, custom-designed pipe paths that ensure treated fresh air is evenly distributed throughout the internal system without compression. The air can be effectively and repeatedly circulated to maintain optimal atmospheric conditions. The air circulation system in Figures 9 to 11 ensures multiple air circulations / flows per hour, guaranteeing consistent atmospheric conditions throughout the growth zone. Fresh air is continuously replenished to promote healthy growth, and rapid gas flow ensures that any changes in atmospheric parameters are quickly addressed. Furthermore, multiple air circulation modes allow users to select the appropriate mode as needed, thereby optimizing the system structure. Within the cultivation area, container 10 is also equipped with an atmospheric pressure outlet, which can be located in one of the side walls of the container. This atmospheric pressure outlet can be equipped with a screen to prevent pests from entering. When the pressure inside container 10 is higher than the external atmospheric pressure, the atmospheric pressure outlet opens to release the internal air, thereby creating positive pressure and ensuring that the air pressure in the entire system is substantially equal to the pressure of the atmospheric environment outside container 10. For the air circulation system shown in Figures 9 to 11, the HVAC system also functions as an air conditioner. That is, when the temperature inside the container is too high or too low, the HVAC system can blow cold or hot air into the room. And when the temperature of the air supplied by the air supply fan is too high or too low, the HVAC system can first lower the temperature of the supplied air or raise the temperature of the supplied air. It should be understood that the air circulation systems shown in Figures 9 to 11 are merely exemplary and not limiting. The specific structure of the air circulation system is not limited to the specific forms depicted in the specification and figures. This plant cultivation system may also include multiple circuits, including but not limited to: quick-connect access ports, fuse boxes, wires, cable trays, and wireless access modules. The quick-connect access port may be a 50 amp quick-connect port with an external electrical connection cable head. This quick-connect access port allows power to be input to the internal system through a single insertion point, ensuring easy electrical setup for the user. The fuse box contains an AC contactor, a main switch, 14 fuses, and a grounded electrical box, reducing the risk of electrical hazards and protecting the internal circuitry from external power surges and internal component failures. The wires are solid-core copper wires. Power is supplied to the internal components through the wires, and the current flowing through the entire system can be safely controlled. The cable trays can be waterproof and fireproof PVC cable guides. Arranging the wires in the cable trays minimizes electrical hazards. The wireless access module may be a GSM / CDMA / WCDMA WiFi module, which includes an industrial-grade GSM / CDMA / WCDMA WiFi receiver and transmitter. Using GSM / CDMA / WCDMA WiFi modules enables reliable internet connectivity for the internal system and allows connection to external servers, enabling continuous monitoring, data collection, analysis, and adjustment of the internal system. Internet connectivity allows the system to respond to software updates and operate in the most efficient manner, such as only operating during low-power periods. Start the system. It should be understood that the various components of the internal circuitry described above are merely exemplary, and the various components may be in other forms. According to one embodiment of the present invention, the plant cultivation system may include a monitoring system and a control system. The monitoring system may include: an air temperature sensor, a humidity sensor, a CO2 level sensor, a liquid temperature sensor, a pH sensor, and a dissolved oxygen sensor. It should be understood that the monitoring system may include other sensors besides those described above. Furthermore, the control system may include one or more controllers to control the environment of the internal system. Each sensor senses various parameter values ​​of the internal system in real time and then provides these parameter values ​​to the controller. The controller automatically controls various parts of the internal system based on the received parameter values, thereby forming an automatic feedback loop. The monitoring and control systems can also be operated by mobile devices, allowing the system to be checked and adjusted from any location. As shown in Figures 7a, 7c, and 8a, the plant cultivation system also includes a lighting system L. The lighting system is positioned above the trays and culture troughs to illuminate the plants. The light source used in this lighting system is an 18 W 1.2m² CTW light source with a heat sink or a 16 W Philips LED module. It should be understood that other types of light sources can be used. Depending on the plants being cultivated, light sources emitting different wavelengths and with different power can be used. The height of the light source is adjustable to ensure the optimal distance between the light source and the plant, catering to different plants with varying light requirements. Furthermore, because the light source height is adjustable, it can be positioned very close to the plant, ensuring plant growth with very low energy consumption, improving energy efficiency and reducing the number of LED modules required. The height of the light source can be adjusted manually, for example, by manually rolling up a shutter. Alternatively, sensors, such as lasers, can be used to detect when a plant blocks the laser beam, indicating an increase in plant height, and then adjust the light source height accordingly. Furthermore, the pressure pumps in the nutrient solution circulation system of the germination and seedling growth area and the nutrient solution circulation system of the cultivation and harvesting area can be turned on 30 minutes before the lighting system is turned on and off 30 minutes after the lighting system is turned off. It should be understood that the lighting system can also provide 24-hour illumination. Figure 12 shows a front view of a plant cultivation system according to another embodiment of the present invention. As shown in Figure 12, the plant cultivation system includes a container 120, which can be a cabinet. Container 120 includes an upper cultivation area and a lower functional component area (which will be shown more clearly in Figure 13). It should be understood that the relative positions of the cultivation area and the functional component area are not limited thereto. Container 120 may include a door 1201, which can be a double door as shown in the figure or a single door. Door 1201 may be made of glass G to facilitate observation of the plant growth in the cultivation area. The lower part of door 1201 may be coated with metallic powder M to obscure components in the functional component area, such as water tanks. Multiple wheels W are provided at the bottom of container 120 for easy movement. A lock L may be provided on door 1201 for enhanced security. Figure 13 shows a perspective view of the plant cultivation system of Figure 12. Figure 13 shows the interior of container 120 and an exploded view of a side section. The side of container 120 may be provided with an attachment 1202. The attachment 1202 may have a U-shaped groove UC for holding water pipes and electrical wires. The attachment 1202 may also have multiple height-adjustable holes 12021 located in the cultivation area; each hole 12021 may be equipped with a fan for air circulation. The attachment 1202 can be covered by a metal plate 1203 for a more aesthetically pleasing appearance and to protect the attachment 1202. The metal plate 1203 may have a handle H for easy handling of the container 120. The metal plate 1203 has multiple holes, the function of which will be described below. The container 120 is also equipped with a wireless access module, such as a WiFi access point. A fan mounted on one side rotates to force air through multiple holes in a metal plate on the other side and holes in the attachment 1202 on the other side, thus entering the container. The air is then drawn towards the side where the fan is located and flows out through multiple holes in the metal plate 1203 on that side, thereby achieving airflow from one side to the other. The fan can also cause air to enter the container through holes on one side, flow to the other side, and then flow out through holes on the other side. It should be understood that the side structure shown in Figure 13 is only schematic and may not include attachments and metal plates. Water pipes, wires, and fans may not be included in the attachments. For air circulation in this system, at least one fan can be installed on one side of the container, and at least one hole can be provided on the side opposite to the at least one fan. The fan can draw air in, thereby introducing air into the interior of the container through the at least one hole. The side with at least one fan can also have at least one hole. Alternatively, fans can be provided on both sides of the container. The airflow direction of the fan is variable. Figure 13 also shows a multi-layer shelf 1205. The multi-layer shelf 1205 is arranged in the cultivation area. The shelf is pull-out for easy operation by staff. Preferably, only one shelf is pulled out at a time to prevent the shelf from tipping over. Figure 14a shows a top view of one shelf. Figure 14a also shows a tray placed in shelf 1205 to hold a cultivation substrate S, which can be a sponge, rock wool, LECA (expanded clay aggregate), coconut coir, perlite, vermiculite, etc. Plants to be cultivated are placed in the cultivation substrate S. Figure 14b shows a bottom view of the shelf shown in Figure 13. As shown in Figure 14b, a lighting system LS with at least one light source, which can be an LED, is located below the shelf. The lighting system is positioned above the tray to illuminate the plants. It should be understood that the light source can be other types of light sources. Depending on the plants being cultivated, light sources emitting different wavelengths and with different power can be used. The height of the light source is adjustable to ensure the optimal distance between the light source and the plant, and to meet the different light requirements of different plants. Furthermore, because the height of the light source is adjustable, it can be positioned very close to the plant, thus ensuring plant growth with very low energy consumption, improving energy efficiency, and reducing the number of LED modules required. The height of the light source can be adjusted manually, for example, by manually rolling up a blind. Alternatively, a sensor, such as a laser, can be used to determine when a plant blocks the laser, indicating that the plant's height has increased, and thus adjust the height of the light source accordingly. The shelf is also equipped with a fluid inlet WI and a fluid outlet WO for water circulation. Area 1401 can be used to place water pipes and electrical wires, etc. The tray is also equipped with a slider 1402 to facilitate the sliding of the shelf in and out of the container 120. Figure 15 shows a detailed schematic diagram of the container bottom. The container bottom is the functional component area, which can house the various components required to operate the plant cultivation system. As shown in Figure 15, the container bottom may be equipped with a first control system 1501 and a second control system 1502. These two control systems can control the operation of the entire plant cultivation system, including, for example, a monitoring system and a control system. The monitoring system may include: an air temperature sensor, a humidity sensor, a CO2 level sensor, a liquid temperature sensor, a pH sensor, and a dissolved oxygen sensor. It should be understood that the monitoring system may include other sensors besides those mentioned above. In addition, the control system may include one or more controllers to control the environment of the internal system. Each sensor senses various parameter values ​​of the internal system in real time and then provides these parameter values ​​to the controller. The controller automatically controls various parts of the internal system based on the received parameter values, thus forming an automatic feedback loop. The monitoring system and control system can also be operated by mobile devices, allowing the system to be checked and adjusted from any location. In addition, Figure 15 also shows multiple nutrient tanks 1503 and water tanks 1504. These nutrient tanks 1503 contain nutrients to provide nutrients to the plants placed on the shelves. The nutrient tanks 1503 can be in the form of pumps. It should be understood that this functional component area may also include other components. The nutrient solution circulation system of this plant cultivation system will be described below. When the nutrient solution circulation system first starts operating, the water tank 1504 contains only water. At this time, the EC sensor installed in the water tank detects that the EC value in the water tank 1504 is lower than the lower limit. Then, the nutrient tank 1503 begins to supply nutrients to the water tank. The water mixed with nutrients, i.e., the nutrient solution, is then pumped upwards from the water tank to a fluid flow pipe (e.g., a water pipe, not shown) via a pressure pump (not shown). The fluid flow pipe delivers the nutrient solution to the tray and leads the nutrient solution flowing from the tray back to the water tank. Afterwards, the nutrient solution circulates along the above path. This circulation enhances the fluidity of the nutrient solution, which is beneficial to plant growth. The nutrient solution circulation of the fluid circulation system can be periodic, continuous 24-hour circulation, or irregular circulation. In addition, the fluid flow pipe can also be connected to the fluid inlet WI to deliver the nutrient solution to the tray, and the fluid flow pipe can also be connected to the fluid outlet WO, through which the nutrient solution flows out of the tray and is led out to the water tank through the fluid flow pipe. A float valve is installed inside the water tank to automatically control the water level. When the water level is below a certain point, the float valve opens, supplying water to the tank. In addition, an EC sensor continuously monitors the EC value within the tank. When the EC value falls below a lower limit, the nutrient tank begins supplying nutrients. This lower EC limit varies depending on the plant. Besides the EC sensor, the water tank may also contain a pH sensor, a water temperature sensor, and a dissolved oxygen sensor. The pH sensor detects the pH value of the nutrient solution in the tank. If the pH of the nutrient solution in tank 701 exceeds a predetermined value or the upper limit of a predetermined range, the nutrient tank 702 will supply an acidic substance to lower the pH of the nutrient solution, reducing it to the lower limit of the predetermined value or range. For example, when the pH reaches 6.5 or higher, the nutrient tank 702 will supply an acidic substance to lower the pH of the nutrient solution, reducing it below 6.5. A water temperature sensor detects the temperature of the nutrient solution in the tank. A cooler can be installed next to the tank so that when the water temperature sensor detects that the temperature of the nutrient solution in the tank is too high, the cooler can lower the temperature of the nutrient solution in the tank. A dissolved oxygen sensor detects the dissolved oxygen content of the nutrient solution in the tank. When the dissolved oxygen content is too low, an air pump can be used to add air to the tank. The nutrient tank 1503 shown in the diagram comprises three tanks. Two of these tanks contain nutrients for plant growth and open when nutrients need to be supplied to the water tank 1504. Placing nutrients in different tanks prevents different nutrients from reacting in the same tank. The third tank contains the acidic substance described above for lowering the pH. This tank opens when the pH sensor detects that the pH of the nutrient solution in the water tank 1504 is too high. It should be understood that the number of nutrient tanks 1503 is not necessarily three. The pressure pump can be turned on 30 minutes before the lighting system is turned on and off 30 minutes after the lighting system is turned off. It should be understood that the lighting system can also provide 24-hour illumination. The systems shown in Figures 12 to 15 occupy little space, making them particularly suitable for use in compact spaces such as restaurants. These systems are easy to use and are especially effective at providing a controlled growing environment for plants with short growth cycles. It should be understood that many of the structures used in the systems shown in Figures 1 to 11—such as the lighting system and the nutrient solution circulation system—can be used in the systems shown in Figures 12 to 15. Among the above implementation schemes, the advantage lies in incorporating an air circulation system, which prevents air from blowing directly onto the plant. Instead, it draws air away from the plant, causing it to flow through it. This avoids putting the plant under stress and ensures its growth. The phrase "one embodiment" as used throughout this specification means that a particular feature, structure, or characteristic described for that embodiment is included in at least one embodiment of the invention. Therefore, the phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment. Furthermore, in one or more embodiments, specific features, structures, or characteristics may be combined into any suitable combination and / or sub-combination. Additionally, it should be understood that the accompanying drawings provided herein are for illustrative purposes to those skilled in the art and are not necessarily drawn to scale. The above description of the embodiments of the invention illustrated herein, including those described in the abstract, is not intended to be exclusive or to limit the precise forms disclosed. Rather, the specific embodiments and implementations of the invention are for illustrative purposes, and various equivalent modifications may be made without departing from the broader spirit and scope of the invention. In fact, it should be understood that specific parameter values, ranges, etc., are for illustrative purposes, and other values ​​may be used in other embodiments and implementations according to the teachings of the invention. These modifications can be made to embodiments of the invention based on the above detailed description. The terminology used in the following claims should not be construed as limiting the invention to the specific embodiments disclosed in the specification and claims. Rather, the scope of the invention will be fully determined by the following claims, which will be interpreted in accordance with the legal principles governing the interpretation of claims. Accordingly, this specification and drawings should be considered exemplary rather than restrictive.

Claims

1. A soilless plant culture system , comprising: a container having an enclosed space provided therein, the enclosed space includes a culture zone; and a fluid circulation system provided in the culture zone for providing nutrient solution for the plant, and the fluid circulation system comprises a water inlet system, a nutrient solution circulation system for the germination and seedling zone, and a nutrient solution circulation system for the nursery and finishing zone; wherein the culture zone comprises a germination and seedling zone, a nursery and finishing zone, and at least one rack system, each of which is provided with at least one layer of shelf for placing components that can accommodate a culture substrate, wherein a plant can be placed in the culture substrate; wherein the nutrient solution circulation system for the germination and seedling zone provides nutrient solution for the germination and seedling zone, and comprises: a water tank for the germination and seedling zone, a plurality of nutrient substance channels for the germination and seedling zone, a pressure pump for the germination and seedling zone, at least one fluid delivery pipeline for the germination and seedling zone, at least one group of fluid introduction pipelines for the germination and seedling zone, and at least one fluid discharge pipeline for the germination and seedling zone; wherein the water inlet system delivers water to the water tank for the germination and seedling zone, the water tank for the germination and seedling zone is connected to the plurality of nutrient substance channels for the germination and seedling zone, and the plurality of nutrient substance channels for the germination and seedling zone deliver nutrient to the water tank for the germination and seedling zone so that nutrient solution is formed in the water tank for the germination and seedling zone; wherein the pressure pump for the germination and seedling zone pumps the nutrient solution in the water tank for the germination and seedling zone to the at least one fluid delivery pipeline for the germination and seedling zone, the at least one fluid delivery pipeline for the germination and seedling zone is communicated with the at least one group of fluid introduction pipelines for the germination and seedling zone so as to deliver the nutrient solution to the at least one group of fluid introduction pipelines for the germination and seedling zone; and wherein the at least one group of fluid introduction pipelines for the germination and seedling zone introduces the nutrient solution to the components for accommodating a culture substrate, and the at least one fluid discharge pipeline for the germination and seedling zone directs the nutrient solution flowing out of the components for accommodating a culture substrate to the water tank for the germination and seedling zone .

2. The soilless plant culture system according to claim 1, wherein the germination and seedling zone comprises germination zones and seedling zones.

3. The soilless plant culture system according to claim 1, wherein the nursery and finishing zone comprises nursery zones and finishing zones, and the nursery zones are interposed between the finishing zones.

4. The soilless plant culture system according to claim 1, wherein the soilless plant culture system comprises a monitoring system and a control system.

5. The soilless plant culture system according to claim 2, wherein the germination and seedling zone is provided with at least one rack system, and wherein the components that can accommodate a culture substrate in the germination and seedling zone is a tray.

6. The soilless plant culture system according to claim 3, wherein the nursery and finishing zone is provided with at least one rack system, and wherein the components that can accommodate a culture substrate in the nursery and finishing zone is a culture channel.

7. The soilless plant culture system according to claim 1, wherein the enclosed space further comprises a front zone, said front zone and said culture zone are spaced apart from each other in an air-tight manner.

8. The soilless plant culture system according to claim 7, wherein the front zone comprises an air purifier and a sterilization device.

9. The soilless plant culture system according to claim 1, wherein the water inlet system comprises a water inlet pipe, a flow control regulator, a water-meter, a booster pump and at least one water purification system that are connected in sequence, wherein the water inlet pipe is connected to an external water source.

10. The soilless plant culture system according to claim 1, wherein the nutrient solution circulation system for the nursery and finishing zone provides nutrient solution for the nursery and finishing zone, and comprises: a water tank for the nursery and finishing zone, a plurality of nutrient substance channels for the nursery and finishing zone, a pressure pump for the nursery and finishing zone, a fluid delivery pipeline for the nursery and finishing zone, at least one row of fluid introduction pipelines for the nursery and finishing zone, and at least one fluid drainage channel for the nursery and finishing zone, wherein the water inlet system delivers water to the water tank for the nursery and finishing zone which is connected to the plurality of nutrient substance channels for the nursery and finishing zone; and the plurality of nutrient substance channels for the nursery and finishing zone delivers nutrient to the water tank for the nursery and finishing zone so that nutrient solution is formed in the water tank for the nursery and finishing zone, wherein the pressure pump for the nursery and finishing zone pumps the nutrient solution in the water tank for the nursery and finishing zone to the fluid delivery pipeline for the nursery and finishing zone, which is communicated with the at least one row of fluid introduction pipelines for the nursery and finishing zone so as to deliver the nutrient solution to the at least one row of fluid introduction pipelines for the nursery and finishing zone, wherein the at least one row of fluid introduction pipelines for the nursery and finishing zone introduces the nutrient solution to the components for accommodating a culture substrate; and wherein the at least one fluid discharge pipeline for the nursery and finishing zone is positioned under an end of the components for accommodating a culture substrate so as to direct the nutrient solution flown out of the components for accommodating a culture substrate to the water tank for the nursery and finishing zone.

11. The soilless plant culture system according to claim 1, wherein in the nutrient solution circulation system for the germination and seedling zone and / or in the nutrient solution circulation system for the nursery and finishing zone, the nutrient solution is constantly circulating, periodically circulating or non-periodically circulating.

12. The soilless plant culture system according to claim 1, wherein the soilless plant culture system further comprises an air circulation system which is provided in the culture zone.

13. The soilless plant culture system according to claim 1, wherein the soilless plant culture system further comprises a lighting system, and a distance between the lighting system and the plant is adjustable.

14. The soilless plant culture system according to claim 1, wherein the container is a container which can be loaded on ships.

15. A soilless plant culture system according to claim 1, comprising: a container having an enclosed space provided therein, the enclosed space includes a culture zone; and an air circulation system which is provided in the enclosed space, wherein the air circulation system comprises a Heating Ventilation Air Conditioning (HVAC) system, an air supply fan and a pipeline system for circulation, wherein the HVAC system is communicated with the air supply fan, and the pipeline system for circulation is communicated with the HVAC system, wherein the pipeline system for circulation comprises any one of the following: a) a plurality of first ports provided on two opposite side walls of the container; b) a plurality of first ports provided on an upper surface of the bottom of the container; and c) a plurality of first ports provided at the top of the container and adjacent to two opposite side walls of the container respectively, and a plurality of fans provided on the two opposite side walls; and wherein the pipeline system for circulation further comprises at least one second port located at the center of the top of the container.

16. The soilless plant culture system according to claim 1, wherein the plurality of first ports are air return ports, via which the air exits the culture zone, and the at least one second port is an air inlet port, via which the air enters the culture zone; or the plurality of first ports are air inlet ports, via which the air enters the culture zone, and the at least one second port is an air return port, via which the air exits the culture zone.

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