Tidal irrigation water and fertilizer integrated system fusing dynamic regulation and control and dynamic regulation and control method

Abstract

The invention discloses a tidal irrigation water and fertilizer integrated system integrating dynamic regulation and control and a dynamic regulation and control method, the system comprises a tidal irrigation module, a control module, a sensor module, a water inlet module, a pesticide mixing module and a drainage module, the control module is connected with the sensor module, the drainage module, the water inlet module and the pesticide mixing module; the tidal irrigation module comprises a tidal irrigation frame and multiple layers of seedbeds, the multiple layers of seedbeds are sequentially arranged on the tidal irrigation frame in the vertical direction, the control module, the water inlet module, the pesticide mixing module and the water drainage module are arranged on the tidal irrigation frame, and the water inlet module and the water drainage module are connected with the seedbeds respectively. And the control module realizes dynamic regulation and control according to data of the sensor module and a fuzzy logic control algorithm. Irrigation and flushing tasks can be efficiently executed through regulation and cooperation of water and fertilizer, and the survival rate and growth efficiency of plants are remarkably improved.

Description

Technical Field

[0001] The present invention relates to a tidal irrigation water-fertilizer integrated system integrating dynamic regulation and a dynamic regulation method, belonging to the technical fields of facility agriculture and intelligent irrigation. Background Art

[0002] Traditional seedling irrigation methods, such as sprinkler irrigation, drip irrigation, and flooding, can easily lead to problems such as wasted water and fertilizer resources, soil pollution, clogged drippers, root rot, and the breeding of pests and diseases. In recent years, tidal irrigation technology, with its "ebb and flow" supply model and water recycling through bottom irrigation, has been widely used in plug tray seedling cultivation for vegetables and flowers. This technology can reduce the incidence of leaf diseases, improve photosynthesis efficiency, and lower seedling production costs.

[0003] Citrus seedlings grown in pots have well-developed root systems, robust plants, and can be grown in containers up to 35cm tall. Pot seedling cultivation differs significantly from tray seedling cultivation. Pot seedling cultivation has slow water supply and drainage, making it prone to root rot and the breeding of pests and diseases. The tidal irrigation system developed by the team earlier can achieve rapid water supply and drainage, but traditional tidal irrigation systems still have the following problems in pot seedling cultivation:

[0004] 1) Traditional tidal irrigation systems can only irrigate water to meet the water needs of plants. How to irrigate essential nutrients during plant growth needs further research.

[0005] 2) Traditional tidal irrigation systems cannot automatically and dynamically precisely control water and fertilizer use, which can easily lead to the following: ① Excessive irrigation water. This can lead to soil saturation, preventing roots from undergoing aerobic respiration, leading to root hair death and loss of water absorption capacity. Plants can wilt, yellow leaves, or even die. Long-term waterlogging can also cause root rot. ② Insufficient irrigation water can inhibit shoot growth and root expansion. Long-term drought can lead to stunted plants, leaf loss, or even complete plant death. ③ Excessive fertilization can deteriorate soil properties and reduce crop quality and yield. For example, excessive nitrogen fertilizer can inhibit the absorption of trace elements such as manganese, copper, and zinc, leading to yellowing leaves and stunted plants. Excessive phosphorus fertilizer can inhibit the absorption of zinc, iron, and magnesium, resulting in short, thick roots, dark green leaves, but short plants. ④ Insufficient fertilization can lead to nutritional imbalances and growth stunts, prolonged reproductive cycles, decreased resistance, reduced yield and quality, soil degradation, and ecological impacts. For example, insufficient nitrogen fertilizer can hinder chlorophyll synthesis, causing yellowing of leaves and reduced photosynthesis efficiency. Insufficient phosphorus fertilizer can affect flowering and fruiting, leading to deformed or falling fruit. Long-term insufficient fertilization can also lead to nutrient loss in the soil, further deteriorating the plant growth environment.

[0006] 3) Traditional ebb and flow irrigation systems lack flushing capabilities, which can lead to residue on the seedbed clogging the system, salt accumulation damaging plants, pathogen growth increasing disease risks, and increased maintenance costs.

[0007] Therefore, it is particularly important to design a tidal irrigation water-fertilizer integrated system that is suitable for both pot seedling cultivation and tray seedling cultivation, as well as a method to achieve efficient dynamic real-time regulation and recycling of water and fertilizer resources. Summary of the Invention

[0008] The purpose of the present invention is to overcome the problems of imperfect water-fertilizer coordination, nutrient imbalance and lack of flushing function in existing tidal irrigation systems, and to provide a tidal irrigation water-fertilizer integrated system that integrates dynamic regulation. The system can significantly improve plant survival rate and growth efficiency through water and fertilizer regulation and coordination, and efficiently perform irrigation and flushing tasks.

[0009] Another object of the present invention is to provide a dynamic control method, which is implemented based on the above-mentioned tidal irrigation water and fertilizer integrated system, and can achieve efficient dynamic real-time control and recycling of water and fertilizer resources.

[0010] The purpose of the present invention can be achieved by taking the following technical solutions:

[0011] A tidal irrigation and fertilizer integration system integrating dynamic regulation, the system comprising a tidal irrigation module, a control module, a sensor module, a water inlet module, a medicine mixing module and a drainage module, wherein the control module is connected to the sensor module, the drainage module, the water inlet module and the medicine mixing module respectively;

[0012] The tidal irrigation module includes a tidal irrigation frame and a multi-layer seedbed. The multi-layer seedbed is arranged in sequence on the tidal irrigation frame in a vertical direction. The control module, water inlet module, medicine mixing module and drainage module are set on the tidal irrigation frame, and the water inlet module and drainage module are respectively connected to the seedbed. The control module realizes dynamic regulation based on the data of the sensor module and the fuzzy logic control algorithm.

[0013] Furthermore, the tidal irrigation frame is constructed of aluminum profiles and fixed at the joints with connectors and screws. The seedbed is constructed of stainless steel, with four stainless steel plates on the four sides of the seedbed and one stainless steel plate at the bottom of the seedbed. The four stainless steel plates on the four sides of the seedbed are spliced ​​together, and the stainless steel plate at the bottom of the seedbed is spliced ​​with the four stainless steel plates on the four sides of the seedbed, and the splicing is welded by electric welding.

[0014] Furthermore, the control module includes a control box, which is arranged above the side frame of the tidal irrigation frame, and the four corners of the control box are connected and fixed by connectors and screws.

[0015] Furthermore, the control box is provided with a single chip microcomputer, a transformer, a relay and an air switch;

[0016] The live wire of the input end of the air switch is connected to the live wire of the 220V power supply, the neutral wire of the input end of the air switch is connected to the neutral wire of the 220V power supply, the positive pole of the input end of the transformer is connected to the live wire of the output end of the air switch, and the negative pole of the input end of the transformer is connected to the neutral wire of the output end of the air switch. The DC+ of the relay is connected to the power supply of the single-chip microcomputer, and the DC- of the relay is connected to the GND of the single-chip microcomputer. The signal output IO port of the single-chip microcomputer is connected to the IN control port of the relay. The output signal of the single-chip microcomputer is used to control the opening and closing state of the relay, and then control the operating state of the relay. The single-chip microcomputer is connected to the Internet through the ESP8266WIFI module, communicates with the Atom Cloud Server, and is connected to the tidal irrigation water and fertilizer integrated system cluster through the LORA module.

[0017] Furthermore, the sensor module includes a conductivity sensor, a water level sensor, a soil moisture sensor and a nitrogen, phosphorus and potassium sensor. The conductivity sensor is used for continuous monitoring of the solution conductivity value, the water level sensor is used to monitor the water level of the seedling bed and the water inlet module, the soil moisture sensor is used to monitor the water content of the soil of the seedling bed, and the nitrogen, phosphorus and potassium sensor measures the ion concentration of nitrogen, phosphorus and potassium components contained in the nutrient solution of the water inlet module.

[0018] Furthermore, the water inlet module includes a clean water storage tank, a nutrient solution storage tank, a power pump, a first tee, a second tee and a third tee, and valves are provided at the liquid outlets of the clean water storage tank and the nutrient solution storage tank. The first inlet end of the first tee is connected to the liquid outlet of the clean water storage tank through a pipeline, and the second inlet end of the first tee is connected to the liquid outlet of the nutrient solution storage tank. The liquid inlet of the power pump is connected to the outlet end of the first tee through a pipeline, and the liquid outlet of the power pump is connected to the inlet end of the second tee through a pipeline, and the first outlet end of the second tee is connected to the liquid inlet of the seedling bed through a pipeline. There is at least one third tee, and the third tee is arranged on the pipeline between the second tee and the seedling bed, and a valve is provided at the first outlet end of the second tee, the second outlet end of the second tee is connected to the liquid inlet of the nutrient solution storage tank through a pipeline, and a valve is provided at the second outlet end of the second tee, and a valve is provided at the liquid inlet of each layer of seedling bed.

[0019] Furthermore, the medicine mixing module includes a power mixing pump and a fertilizer mother liquid storage tank. The liquid outlet of the fertilizer mother liquid storage tank and the second outlet end of the second tee are respectively connected to the two liquid inlets of the power mixing pump. A proportional regulating valve is arranged between the fertilizer mother liquid storage tank and the power mixing pump, and the liquid outlet of the power mixing pump is connected to the nutrient solution storage tank.

[0020] Furthermore, the drainage module includes a fourth tee and a fifth tee, the liquid outlet of the seedling bed is provided with a valve, the fifth tee is connected to the liquid outlet of the seedling bed, there is at least one fourth tee, and the fourth tee is provided on the pipeline between the fifth tee and the seedling bed, the first outlet end of the fifth tee is connected to the liquid inlet of the clean water storage tank through a pipeline, and a valve is provided at the first outlet end of the fifth tee, the second outlet end of the fifth tee is connected to the liquid inlet of the nutrient solution storage tank through a pipeline, and a valve is provided at the second outlet end of the fifth tee.

[0021] Another object of the present invention can be achieved by adopting the following technical solutions:

[0022] A dynamic control method is implemented based on the above-mentioned tidal irrigation water and fertilizer integrated system, the method includes automatic control state and manual control state, the automatic control state and manual control state include monitoring mode, clear water irrigation mode, nutrient solution irrigation mode, mixing mode and flushing mode;

[0023] The clean water irrigation mode includes: opening the valve of the liquid outlet of the clean water storage tank, closing the valve of the liquid outlet of the nutrient solution storage tank, and turning on the power pump, then opening the valve at the first outlet end of the second tee, closing the valve at the second outlet end of the second tee, and then opening the valve of the seedling bed inlet. Water flows out of the liquid outlet of the clean water storage tank, passes through the first tee, then passes through the power pump, and then flows upward through the valve at the first outlet end of the second tee, then flows through the pipeline to reach the valve of the seedling bed inlet, and finally reaches the seedling bed; the water level sensor of the seedling bed is used to monitor the water level, and when the water level reaches the level that completely covers the soil, the water is stopped. Irrigation: First, close the valve at the liquid inlet of the seedling bed, then close the power pump and the valve at the liquid outlet of the clean water storage tank; by monitoring the value of the soil moisture sensor, when the humidity reaches the preset value, start the clean water recovery mode, open the valve at the liquid outlet of the seedling bed and the valve at the first outlet end of the fifth tee, and the water in the seedling bed flows through the valve at the liquid outlet of the seedling bed by gravity, then passes through the fourth tee and the fifth tee, and then passes through the valve at the first outlet end of the fifth tee, and finally flows back to the clean water storage tank. After draining, close the valve at the liquid outlet of the seedling bed and the valve at the first outlet end of the fifth tee;

[0024] The nutrient solution irrigation mode includes: first opening the valve of the liquid outlet of the nutrient solution storage tank, closing the valve of the liquid outlet of the clean water storage tank, and turning on the power pump, then opening the valve at the first outlet end of the second tee, closing the valve at the second outlet end of the second tee, and then opening the valve of the seedling bed inlet, the nutrient solution flows out from the liquid outlet of the nutrient solution storage tank, passes through the first tee, then passes through the power pump, and then flows upward through the valve at the first outlet end of the second tee, then flows through the pipeline to reach the valve of the seedling bed inlet, and finally reaches the seedling bed; the water level sensor of the seedling bed is used to monitor the water level, and the water level is stopped when the water level reaches the level that completely covers the soil. Irrigation: First, close the valve at the liquid inlet of the seedling bed, then close the power pump and the valve at the liquid outlet of the nutrient solution storage tank; by monitoring the value of the conductivity sensor, after reaching the preset value standard, start the nutrient solution recovery mode, open the valve at the liquid outlet of the seedling bed and the valve at the second outlet end of the fifth tee, and the nutrient solution in the seedling bed flows through the valve at the liquid outlet of the seedling bed by gravity, then passes through the fourth tee and the fifth tee, and then passes through the valve at the second outlet end of the fifth tee, and finally flows back to the nutrient solution storage tank. After draining, close the valve at the liquid outlet of the seedling bed and the valve at the second outlet end of the fifth tee;

[0025] The mixing mode includes: opening the valve at the outlet of the nutrient solution storage tank, closing the valve at the outlet of the clean water storage tank, and opening the power pump, then opening the valve at the second outlet end of the second tee, closing the valve at the first outlet end of the second tee, and the low-concentration nutrient solution flows out from the outlet of the nutrient solution storage tank, passes through the first tee, and then passes through the power pump, and then passes through the valve at the second outlet end of the second tee to the side, and then passes through the power mixing pump. The bottom of the power mixing pump is connected to the fertilizer mother liquid storage tank, and the nutrient solution and mother liquid are fully and evenly mixed according to the proportion through water power, and then return to the nutrient solution storage tank. At the same time, the concentration of the nutrient solution storage tank is detected. If the nitrogen, phosphorus and potassium reach the preset value, the mixing mode is stopped, and the valve at the second outlet end of the second tee is closed, and the valve at the first outlet end of the second tee is opened, and then the valve at the liquid inlet of the seedling bed is opened. The nutrient solution is passed through the valve at the first outlet end of the second tee by the power pump, and then flows through the pipeline to the valve at the seedling bed liquid inlet, and finally reaches the seedling bed; by monitoring the water level sensor of the seedling bed, after the water level reaches the water level that completely covers the soil, the irrigation is stopped, the valve at the seedling bed liquid inlet is closed first, and then the power pump and the valve at the liquid outlet of the nutrient solution storage tank are closed; by monitoring the value of the conductivity sensor, after reaching the preset value standard, the nutrient solution recovery mode is started, the valve at the seedling bed liquid outlet and the valve at the second outlet end of the fifth tee are opened, and the nutrient solution in the seedling bed flows through the valve at the seedling bed liquid outlet by gravity, and then passes through the fourth and fifth tees, and then passes through the valve at the second outlet end of the fifth tee, and finally is discharged back to the nutrient solution storage tank. After draining, the valve at the seedling bed liquid outlet and the valve at the second outlet end of the fifth tee are closed.

[0026] Furthermore, the flushing mode includes: opening the valve at the liquid outlet of the clean water storage tank, closing the valve at the liquid outlet of the nutrient solution storage tank, and opening the valve at the first outlet end of the second tee, closing the valve at the second outlet end of the second tee, and then opening the valve at the seedling bed inlet, the valve at the seedling bed outlet and the valve at the first outlet end of the second tee, and then turning on the power pump, clean water flows out from the liquid outlet of the clean water storage tank, passes through the first tee, then passes through the power pump, and then flows upward through the valve at the first outlet end of the second tee, and then flows through the pipeline to reach the valve at the seedling bed inlet, and finally reaches the seedling bed, and at the same time, the power of the power pump is dynamically adjusted according to the water level height provided by the water level sensor in the seedling bed.

[0027] The present invention has the following beneficial effects compared to the prior art:

[0028] 1. The tidal irrigation water-fertilizer integrated system of the present invention integrates the irrigation and mixing modules of water and fertilizer, achieving the purpose of intensive and portable cultivation and seedling raising.

[0029] 2. The present invention realizes real-time irrigation and flushing of clean water and nutrient solution through the coordinated control of multi-source sensor fusion (EC, nitrogen, phosphorus and potassium ions, soil moisture, water level) and fuzzy logic control algorithm, thus realizing automation and reducing labor costs.

[0030] 3. The present invention adopts a joint control design of a water-powered mixing pump and a proportional regulating valve to achieve uniform mixing of the mother liquor and the nutrient solution without an additional stirring device. The energy consumption is lower than that of the traditional mechanical stirring system, breaking through the technical bottleneck of high energy consumption of agricultural irrigation equipment.

[0031] 4. The present invention integrates the Internet of Things remote monitoring architecture (ESP8266+Atom Cloud Server+LORA), supports real-time control and data tracing on mobile phones, shortens the equipment failure response time from 2 hours of traditional manual inspection to 10 minutes, and improves operation and maintenance efficiency by 65%. It is particularly suitable for the intensive management needs of large-scale seedling bases. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0033] Figure 1 Schematic diagram of a tidal irrigation water-fertilizer integrated system and a dynamic control method according to an embodiment of the present invention.

[0034] Figure 2 This is a three-dimensional structural diagram of a tidal irrigation water-fertilizer integrated system according to an embodiment of the present invention.

[0035] Figure 3 This is a planar structural diagram of a tidal irrigation water-fertilizer integrated system according to an embodiment of the present invention.

[0036] Figure 4 Schematic diagram of joint control of tidal irrigation according to an embodiment of the present invention.

[0037] Among them, 1-tidal irrigation frame, 2-seedbed, 3-control box, 4-clean water storage tank, 5-nutrient solution storage tank, 6-power pump, 7-first three-way, 8-second three-way, 9-first valve, 10-second valve, 11-third three-way, 12-third valve, 13-fourth valve, 14-fifth valve, 15-sixth valve, 16-power mixing pump, 17-fertilizer mother liquid storage tank, 18-proportional regulating valve, 19-fourth three-way, 20-fifth three-way, 21-seventh valve, 22-eighth valve, 23-ninth valve, 24-tenth valve. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0040] The description of the embodiments should be understood in conjunction with the accompanying drawings. The embodiments are intended merely to illustrate specific embodiments in which the present invention may be implemented and do not limit the present invention. Directional terms used herein, such as "upper," "lower," "front," "back," "left," "right," "inner," "outer," and "side," are intended solely to refer to the directions in the accompanying drawings. Therefore, the directional terms used are intended to illustrate and facilitate understanding of the present invention and are not intended to limit the present invention.

[0041] Example:

[0042] like Figure 1As shown, this embodiment takes into account that there are many users growing citrus crops in Meizhou area and the economic value of citrus is relatively high, and chooses to plan and design tidal irrigation facilities for citrus seedlings in Meizhou. Therefore, a tidal irrigation water and fertilizer integrated system integrating dynamic regulation is provided. The system includes a tidal irrigation module, a control module, a sensor module, a water inlet module, a drug mixing module and a drainage module. The control module is respectively connected to the sensor module, the drainage module, the water inlet module and the drug mixing module.

[0043] like Figures 1 to 3 As shown, the tidal irrigation module includes a tidal irrigation frame 1 and two layers of seedbeds 2. The two layers of seedbeds 2 are arranged in sequence in a vertical direction (i.e., arranged up and down) on the tidal irrigation frame 1. The control module, water inlet module, medicine mixing module and drainage module are arranged on the tidal irrigation frame 1, and the water inlet module and drainage module are respectively connected to the seedbeds 2. The control module realizes dynamic regulation based on the data of the sensor module and the fuzzy logic control algorithm.

[0044] Furthermore, the tidal irrigation frame 1 is constructed of aluminum profiles and is fixed at the joints with connectors and screws to prevent shaking and falling. The seedbed 2 is constructed of stainless steel. The seedbed 2 has four stainless steel plates on the four sides and a stainless steel plate at the bottom. The four stainless steel plates on the four sides of the seedbed are spliced ​​together, and the stainless steel plate at the bottom of the seedbed is spliced ​​with the four stainless steel plates on the four sides of the seedbed. The joints are welded with electric welding to prevent water leakage. There is no steel plate on the top of the seedbed 2, that is, the top of the seedbed 2 is open, which is convenient for the seedlings to receive sunlight and for the growers to observe the growth status of the plants. The seedlings in this embodiment are citrus seedlings.

[0045] Furthermore, the control module includes a control box 3, which is arranged above the side frame of the tidal irrigation frame 1, and the four corners of the control box 3 are connected and fixed to the aluminum profile by connectors and screws; specifically, a single-chip microcomputer, a transformer, a relay and an air switch are arranged inside the control box, wherein the single-chip microcomputer is an STM32 series single-chip microcomputer; the live wire of the input end of the air switch is connected to the live wire of the 220V power supply, and the neutral wire of the input end of the air switch is connected to the neutral wire of the 220V power supply. The air switch is responsible for providing protection for the power pump to avoid short circuit and accidental touch, thereby causing danger; the positive pole of the input end of the transformer is connected to the live wire of the output end of the air switch, and the negative pole of the input end of the transformer is connected to the neutral wire of the output end of the air switch. The transformer is used to The quasi-voltage of 220V is converted to 20V; the DC+ of the relay is connected to the power supply of the single-chip microcomputer, the DC- of the relay is connected to the GND of the single-chip microcomputer, the signal output IO port of the single-chip microcomputer is connected to the IN control port of the relay, and the output signal of the single-chip microcomputer is used to control the opening and closing state of the relay, thereby controlling the operating state of the relay; the single-chip microcomputer is connected to the sensor module, and receives the data of the corresponding sensor of the sensor module through the signal port of the single-chip microcomputer for analysis and processing. After analysis and processing, the single-chip microcomputer outputs the control signal to the relay in real time, and the relay outputs the signal to the water inlet module, the medicine mixing module and the drainage module, thereby controlling the water inlet module, the medicine mixing module and the drainage module to perform specific operations; such as Figure 4 As shown, this is a schematic diagram of the joint control of this embodiment. The single-chip microcomputer is connected to the Internet through the ESP8266WIFI module and communicates with the Atomic Cloud Server. It can transmit data to the Atomic Cloud Server and receive instructions from the Atomic Cloud Server to perform corresponding operations. The single-chip microcomputer connects to the tidal irrigation and water-fertilizer integrated system cluster through the LORA module, that is, LORA is responsible for connecting to each tidal irrigation and water-fertilizer integrated system. The tidal irrigation control APP and the host computer can be connected to the Atomic Cloud Server through the network, and then receive data from the single-chip microcomputer and issue instructions to the single-chip microcomputer to realize remote monitoring and control of the tidal irrigation and water-fertilizer integrated system. The tidal irrigation control APP and the host computer can set the control state, which is specifically divided into automatic control state and manual control state.

[0046] Furthermore, the sensor module includes an electrical conductivity (EC) sensor, a water level sensor, a soil moisture sensor and a nitrogen, phosphorus and potassium sensor. The conductivity sensor is used for continuous monitoring of the solution conductivity value. The water level sensor is used to monitor the water level of the seedling bed and the water inlet module, so that the single-chip microcomputer can perform data analysis and processing and real-time regulation. The soil moisture sensor is used to monitor the moisture content of the soil of the seedlings in the seedling bed, which is the necessary data for dynamic regulation. The nitrogen, phosphorus and potassium sensor measures the ion concentration of nitrogen, phosphorus and potassium components contained in the nutrient solution of the water inlet module, which solves the problem that the value measured by the conductivity sensor alone cannot distinguish the specific ion concentration; the sensor module can expand the detection dimension, obtain a multi-parameter fusion regulation model, and realize nutrient-physiological state coordinated control.

[0047] Furthermore, the water inlet module includes a clean water storage tank 4, a nutrient solution storage tank 5, a power pump 6, a first tee 7, a second tee 8 and a third tee 9. The liquid outlets of the clean water storage tank 4 and the nutrient solution storage tank 5 are respectively provided with a first valve 10 and a second valve 11. The first valve 10 is responsible for controlling the opening and closing of the clean water storage tank. The first inlet end of the first tee 7 is connected to the liquid outlet of the clean water storage tank 4 through a pipeline, the second inlet end of the first tee 7 is connected to the liquid outlet of the nutrient solution storage tank 5, and the liquid inlet of the power pump 6 is connected to the liquid outlet of the nutrient solution storage tank 5. It is connected to the outlet end of the first tee 7 through a pipeline, which is responsible for providing power for the system during the high tide stage, thereby avoiding the need for multiple water pumps to provide power for different nutrient solutions, which causes cost waste and space waste. The outlet of the power pump 6 is connected to the inlet end of the second tee 8 through a pipeline, and the first outlet end of the second tee 8 is connected to the seedbed 2 through a pipeline. Since there are two layers of seedbeds, the third tee 9 is one, and the third tee 9 is set on the pipeline between the second tee 8 and the seedbed. Similarly, if there are more than three layers of seedbeds, the third tee 9 is More than two, a third valve 12 is provided at the first outlet end of the second three-way valve, and the second outlet end of the second three-way valve is connected to the liquid inlet of the nutrient solution storage tank 5 through a pipeline, and a fourth valve 13 is provided at the second outlet end of the second three-way valve. The third valve 12 and the fourth valve 13 are responsible for controlling whether to enter the mixed mode. The liquid inlets of the two-layer seedling beds 2 are respectively provided with a fifth valve 14 and a sixth valve 15. The fifth valve 14 and the sixth valve 15 are responsible for controlling whether the liquid enters the seedling bed. The liquid inlet of the two-layer seedling bed 2 is 12 cm away from the straight line height of the bottom of the seedling bed on the side of the seedling bed. Each pipeline is responsible for the circulation of the liquid, and the combination of raw tape can avoid water leakage to the greatest extent; the power pump 6 is connected to the relay and air switch inside the control box through wires. Specifically, the red positive wire of the power pump 6 is connected to the normally closed port of the relay, and the blue negative wire is connected to the blue neutral wire port of the air switch. The power pump 6 operates under a voltage of 220V, the red positive wire of each valve is connected to the normally closed port of the relay, and the blue negative wire is connected to the negative output terminal of the transformer. Each valve operates under a 20V state.

[0048] Furthermore, the mixing module includes a power mixing pump 16 and a fertilizer mother liquid storage tank 17. The liquid outlet of the fertilizer mother liquid storage tank 17 and the second outlet end of the second tee 8 are respectively connected to the two liquid inlets of the power mixing pump 16. A proportional regulating valve 18 is arranged between the fertilizer mother liquid storage tank 17 and the power mixing pump 16. The liquid outlet of the power mixing pump 16 is connected to the nutrient solution storage tank 5. The liquid enters the interior through the water inlet of the hydrodynamic mixing pump under the power of the power pump, and then generates negative pressure through the conversion of fluid kinetic energy under the Bernoulli effect, sucks in the fertilizer mother liquid and preliminarily mixes it, and then adjusts the proportional regulating valve 18 to make the liquid and the fertilizer mother liquid fully and evenly mixed, and then flows out at the water outlet of the hydrodynamic mixing pump. The Venturi effect is used to realize the mother liquid suction and mixing, without the need for an additional stirring motor, thereby achieving the purpose of reducing energy consumption, and under the coordinated control of the proportional regulating valve 18, the purpose of mixing in a suitable proportion is achieved.

[0049] Furthermore, the drainage module includes a fourth three-way valve 19 and a fifth three-way valve 20. The liquid outlets of the two layers of seedling beds 2 are respectively provided with a seventh valve 21 and an eighth valve 22. The liquid outlet of the seedling bed 2 is located at the bottom of the seedling bed and is concave, which can avoid leakage and speed up drainage to the greatest extent. The fifth three-way valve 20 is connected to the liquid outlet of the seedling bed 2. Since there are two layers of seedling beds, the fourth three-way valve 19 is one, and the fourth three-way valve is set on the pipeline between the fifth three-way valve and the seedling bed. Similarly, if there are more than three layers of seedling beds, there are more than two fourth three-way valves 19, and the first outlet end of the second three-way valve is at the bottom of the seedling bed. A third valve 12 is provided, the first outlet end of the fifth tee is connected to the liquid inlet of the clean water storage tank 4 through a pipeline, and a ninth valve 23 is provided at the first outlet end of the fifth tee 20, the second outlet end of the fifth tee 20 is connected to the liquid inlet of the nutrient solution storage tank 5 through a pipeline, and a tenth valve 24 is provided at the second outlet end of the fifth tee. The fifth tee 20, the ninth valve 23 and the tenth valve 24 can recycle the discharged liquid into different liquid storage tanks according to different situations, so as to avoid waste of nutrient solution and clean water and achieve the purpose of saving resources.

[0050] This embodiment also provides a dynamic control method, which is implemented based on the above-mentioned tidal irrigation water-fertilizer integrated system, including automatic control state and manual control state. The automatic control state and manual control state include monitoring mode, clear water irrigation mode, nutrient solution irrigation mode, mixed mode and flushing mode.

[0051] Monitoring mode includes: continuously monitoring the sensor status and recording it.

[0052] The clean water irrigation mode includes: opening the first valve 10 at the outlet of the clean water storage tank 4, closing the second valve 11 at the outlet of the nutrient solution storage tank 5, and opening the power pump 6, then opening the third valve 12 at the first outlet end of the second tee 8, closing the fourth valve 13 at the second outlet end of the second tee 8, and then opening the fifth valve 14 and the sixth valve 15 at the liquid inlet of the seedling bed 2. Water flows out from the outlet of the clean water storage tank 4, passes through the first tee 7, and then passes through the power pump 6, and then flows upward through the third valve 12 at the first outlet end of the second tee 8, and then flows through the pipeline to reach the fifth valve 14 and the sixth valve 15 at the liquid inlet of the seedling bed 2, and finally reaches the seedling bed 2; through the water level sensor monitoring the seedling bed 2, when the water level reaches the level that completely covers the soil, the irrigation is stopped, and the fifth valve 1 at the liquid inlet of the seedling bed 2 is closed first. 4 and the sixth valve 15, then close the power pump 6 and the first valve 10 at the outlet of the clean water storage tank 4; by monitoring the value of the soil moisture sensor, when the humidity reaches a preset value, the preset value of this embodiment is 70%, start the clean water recovery mode, open the seventh valve 21 and the eighth valve 22 at the outlet of the seedling bed 2, and open the ninth valve 23 at the first outlet end of the fifth three-way valve 20. The water in the seedling bed 2 flows through the seventh valve 21 and the eighth valve 22 at the outlet of the seedling bed 2 by gravity, then passes through the fourth three-way valve 19 and the fifth three-way valve 20, and then passes through the ninth valve 23 at the first outlet end of the fifth three-way valve 20, and finally flows back to the clean water storage tank 4. After the water is completely drained, the seventh valve 21, the eighth valve 22 at the outlet of the seedling bed 2 and the ninth valve 23 at the first outlet end of the fifth three-way valve are closed;

[0053] The nutrient solution irrigation mode includes: first opening the second valve 11 at the outlet of the nutrient solution storage tank 5, closing the first valve 10 at the outlet of the clean water storage tank 4, and opening the power pump 6, then opening the third valve 12 at the first outlet end of the second tee 8, closing the fourth valve 13 at the second outlet end of the second tee 8, and then opening the fifth valve 14 and the sixth valve 15 at the liquid inlet of the seedling bed 2. The nutrient solution flows out from the outlet of the nutrient solution storage tank 5, passes through the first tee 7, and then passes through the power pump 6, and then flows upward through the third valve 12 at the first outlet end of the second tee 8, and then flows through the pipeline to reach the fifth valve 14 and the sixth valve 15 at the liquid inlet of the seedling bed 2, and finally reaches the seedling bed 2; by monitoring the water level sensor of the seedling bed 2, when the water level reaches the level that completely covers the soil, the irrigation is stopped, and the fifth valve 14 and the sixth valve 15 at the liquid inlet of the seedling bed 2 are first closed. The sixth valve 15, then closes the power pump 6 and the second valve 11 at the outlet of the nutrient solution storage tank 5; by monitoring the value of the conductivity sensor, after reaching the preset value standard, the preset value of this embodiment is 0.4ms / cm, the nutrient solution recovery mode is started, the seventh valve 21 and the eighth valve 22 at the outlet of the seedling bed 2 are opened, and the tenth valve 24 at the second outlet end of the fifth three-way valve 20 is opened. The nutrient solution in the seedling bed 2 flows through the seventh valve 21 and the eighth valve 22 at the outlet of the seedling bed 2 by gravity, and then passes through the fourth three-way valve 19 and the fifth three-way valve 20, and then passes through the tenth valve 24 at the second outlet end of the fifth three-way valve 20, and finally flows back to the nutrient solution storage tank 5. After draining, the seventh valve 21, the eighth valve 22 at the outlet of the seedling bed 2 and the tenth valve 24 at the second outlet end of the fifth three-way valve 20 are closed.

[0054] The mixing mode includes: opening the second valve 11 at the outlet of the nutrient solution storage tank 5, closing the first valve 10 at the outlet of the clean water storage tank 4, and opening the power pump 6, then opening the fourth valve 13 at the second outlet end of the second tee 8, closing the third valve 12 at the first outlet end of the second tee 8, and the low-concentration nutrient solution flows out of the outlet of the nutrient solution storage tank 5, passes through the first tee 7, then passes through the power pump 6, and then passes through the fourth valve 13 at the second outlet end of the second tee 8 to the side, and then passes through the power mixing pump 16. The bottom of the power mixing pump 16 is connected to the fertilizer The mother liquid storage tank 17 is used to fully and evenly mix the nutrient solution and the mother liquid in proportion by hydrodynamics, and then return them to the nutrient solution storage tank 5. At the same time, the concentration of the nutrient solution storage tank 5 is detected. If the nitrogen, phosphorus and potassium reach the preset values, the preset values ​​of this embodiment are 150 mg / kg, 80 mg / kg and 120 mg / kg respectively, the mixing mode is stopped, and the fourth valve 13 at the second outlet end of the second three-way 8 is closed, and the third valve 12 at the first outlet end of the second three-way 8 is opened. Then, the valve of the liquid inlet of the seedling bed 2 is opened, and the nutrient solution is allowed to pass through the power pump 6. The water flows through the valve at the first outlet end of the second three-way valve 8, then flows through the pipeline to the fifth valve 14 and the sixth valve 15 at the liquid inlet of the seedling bed 2, and finally reaches the seedling bed 2; by monitoring the water level sensor of the seedling bed 2, when the water level reaches the level that completely covers the soil, the irrigation is stopped, and the fifth valve 14 and the sixth valve 15 at the liquid inlet of the seedling bed 2 are closed first, and then the power pump 6 and the second valve 11 at the liquid outlet of the nutrient solution storage tank 5 are closed; by monitoring the value of the conductivity sensor, when it reaches the preset value standard, the preset value of this embodiment is 0.4ms / cm, the nutrient solution recovery mode is started , open the seventh valve 21 and the eighth valve 22 at the liquid outlet of the seedling bed 2 and the tenth valve 24 at the second outlet end of the fifth three-way valve. The nutrient solution in the seedling bed 2 flows through the seventh valve 21 and the eighth valve 22 at the liquid outlet of the seedling bed 2 by gravity, then passes through the fourth three-way valve 19 and the fifth three-way valve 20, and then passes through the tenth valve 24 at the second outlet end of the fifth three-way valve 20, and finally flows back to the nutrient solution storage tank 5. After draining, close the seventh valve 21, the eighth valve 22 at the liquid outlet of the seedling bed 2 and the tenth valve 24 at the second outlet end of the fifth three-way valve 20.

[0055] The flushing mode includes: opening the first valve 10 at the outlet of the clean water storage tank 4, closing the second valve 11 at the outlet of the nutrient solution storage tank 5, and the third valve 12 at the first outlet end of the second tee 8, closing the fourth valve 13 at the second outlet end of the second tee 8, and then opening the fifth valve 14 and the sixth valve 15 at the liquid inlet of the seedbed 2, the seventh valve 21 and the eighth valve 22 at the liquid outlet of the seedbed 2, and the third valve 12 at the first outlet end of the second tee 8, and then opening the power pump 6, and the clean water flows out from the outlet of the clean water storage tank 5, passes through the first tee 7, and then passes through the power pump 6, and then flows upward through the third valve at the first outlet end of the second tee. 12, then flows through the pipeline to the fifth valve 14 and the sixth valve 15 at the liquid inlet of the seedling bed 2, and finally reaches the seedling bed 2. Since the seventh valve 21 and the eighth valve 22 at the liquid outlet of the seedling bed 2 are opened at the same time, the clean water will be discharged through the drain outlet after passing through the citrus seedlings in the seedling bed 2. At the same time, the power of the power pump is dynamically adjusted according to the water level height provided by the water level sensor in the seedling bed 2, so that the clean water can reach a faster flushing flow speed, thereby achieving the purpose of flushing the seedling bed 2 and the citrus seedlings. This design can avoid flushing after each nutrient solution irrigation and causing waste of resources, and can also avoid not flushing all the time, which will cause the seedling bed to be contaminated and affect the normal growth of the citrus seedlings.

[0056] In this embodiment, the manual control state is that the user manually selects from five modes to meet the needs of specific situations. The automatic control state is executed using a fuzzy logic control algorithm, which is used for the system to automatically select from five modes. The sensor values ​​read include soil moisture, soil electrical conductivity, soil nitrogen, phosphorus, and potassium values, the values ​​of nutrient elements in the nutrient solution storage tank, and the number of times the nutrient solution is irrigated. The algorithm can include three modules: fuzzification of input parameters, fuzzy rule base and activation calculation, and defuzzification and decision output.

[0057] Furthermore, the input parameter fuzzification is as follows:

[0058] 1) Soil moisture deviation membership function

[0059] Define humidity deviation ΔH = H (current) - H (threshold), where H is humidity. The H value adopts three-level fuzzy classification (low, normal, high), and the humidity threshold is 60%. The formula is as follows:

[0060]

[0061] The values ​​of a, b, c, and d are: Low: [-20, -15, -5, 0], Normal: [-10, -5, 5, 10], High: [5, 10, 20, 25].

[0062] 2) Conductivity value membership function

[0063] Define ΔEC = EC(current) - EC(target), where EC is conductivity and the target value is 0.4ms / cm. The conductivity value adopts a two-level fuzzy classification (deficient, normal). The specific formula is as follows:

[0064]

[0065] Lack: c = 0.8, a = 0.15, unit: ms / cm;

[0066] Normal: c=1.0, a=0.1, unit: ms / cm.

[0067] 3) Nutrient element membership function

[0068] Soil nitrogen, phosphorus and potassium are defined as NPK, using a two-level fuzzy classification (lack, sufficiency):

[0069]

[0070] Deficiency: nitrogen [0, 50, 70], phosphorus [0, 40, 60], potassium [0, 70, 100], unit: mg / k;

[0071] Adequate: Nitrogen [60, 150, 150], Phosphorus [50, 80, 80], Potassium [80, 120, 120], unit: mg / k.

[0072] The nutrient elements of the nutrient solution storage tank are set to F, and its values ​​are divided into unsatisfied and satisfied. The standards for nitrogen, phosphorus and potassium are 150mg / kg, 80mg / kg and 120mg / kg, and meeting the standards is satisfied, while not meeting the standards is unsatisfied.

[0073] The number of nutrient solution irrigations is set to G, which is divided into unreached and reached. The standard is 3 times, and if it is lower than the standard, it is unreached, otherwise it is reached.

[0074] Furthermore, the fuzzy rule base and activation calculation are as follows:

[0075] 1) Fuzzy rule base

[0076] 1.1) Clear water irrigation mode: H=low and EC=normal and NPK=sufficient and F=unsatisfied / satisfied and G=not achieved.

[0077] 1.2) Nutrient solution irrigation mode: H=Low / Normal and EC=Deficient / Normal and NPK=Deficient and F=Satisfied and G=Not Satisfied.

[0078] 1.3) Mixed mode: H = Low / Normal and EC = Deficient / Normal and NPK = Deficient and F = Not satisfied and G = Not achieved.

[0079] 1.4) Flushing Mode: H = Low / Normal / High and EC = Deficient / Normal and NPK = Deficient / Sufficient and F = Not Satisfied / Satisfied and G = Attained.

[0080] 1.5) Monitoring mode: Other situations are monitoring status.

[0081] 2) Activation calculation

[0082] The activation degree of each rule is the minimum activation degree of the membership degree of each condition, and the activation degree is α, which is calculated as follows:

[0083] α=min(μΔH,μΔEC,μN,μP,μK)

[0084] Furthermore, the defuzzification and decision output are as follows:

[0085] The system defaults to monitoring status. If the flushing mode is activated, other rules will be directly overwritten. In other cases, the irrigation mode corresponding to the rule with the highest activation degree will be directly selected.

[0086] In summary, the present invention can significantly improve the survival rate and growth efficiency of plants through water and fertilizer regulation and coordination, and efficient execution of irrigation and flushing tasks. It can make irrigation more sufficient and balanced, improve water and fertilizer utilization, reduce root rot and the breeding of pests and diseases, and improve plant survival rate and seedling quality.

[0087] The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and inventive concept of the present invention within the scope disclosed by the present invention, which falls within the scope of protection of the present invention.

Claims

1. A tidal irrigation and fertilizer integration system integrating dynamic regulation, characterized in that: The system includes a tidal irrigation module, a control module, a sensor module, a water inlet module, a medicine mixing module and a drainage module, wherein the control module is connected to the sensor module, the drainage module, the water inlet module and the medicine mixing module respectively; The tidal irrigation module includes a tidal irrigation frame and a multi-layer seedbed. The multi-layer seedbed is arranged in sequence on the tidal irrigation frame in a vertical direction. The control module, water inlet module, medicine mixing module and drainage module are set on the tidal irrigation frame, and the water inlet module and drainage module are respectively connected to the seedbed. The control module realizes dynamic regulation based on the data of the sensor module and the fuzzy logic control algorithm.

2. The tidal irrigation water and fertilizer integrated system according to claim 1, characterized in that: The tidal irrigation frame is constructed of aluminum profiles and is fixed at the joints with connectors and screws. The seedbed is constructed of stainless steel, with four stainless steel plates on the four sides of the seedbed and one stainless steel plate at the bottom of the seedbed. The four stainless steel plates on the four sides of the seedbed are spliced ​​together, and the stainless steel plate at the bottom of the seedbed is spliced ​​with the four stainless steel plates on the four sides of the seedbed, and the splicing is welded by electric welding.

3. The tidal irrigation water and fertilizer integrated system according to claim 1, characterized in that: The control module includes a control box, which is arranged above the side frame of the tidal irrigation frame. The four corners of the control box are connected and fixed by connectors and screws.

4. The tidal irrigation water and fertilizer integrated system according to claim 3, characterized in that: The control box is provided with a single chip microcomputer, a transformer, a relay and an air switch; The live wire of the input end of the air switch is connected to the live wire of the 220V power supply, the neutral wire of the input end of the air switch is connected to the neutral wire of the 220V power supply, the positive pole of the input end of the transformer is connected to the live wire of the output end of the air switch, and the negative pole of the input end of the transformer is connected to the neutral wire of the output end of the air switch. The DC+ of the relay is connected to the power supply of the single-chip microcomputer, and the DC- of the relay is connected to the GND of the single-chip microcomputer. The signal output IO port of the single-chip microcomputer is connected to the IN control port of the relay. The output signal of the single-chip microcomputer is used to control the opening and closing state of the relay, and then control the operating state of the relay. The single-chip microcomputer is connected to the Internet through the ESP8266WIFI module, communicates with the Atom Cloud Server, and is connected to the tidal irrigation water and fertilizer integrated system cluster through the LORA module.

5. The tidal irrigation water and fertilizer integrated system according to claim 1, characterized in that: The sensor module includes a conductivity sensor, a water level sensor, a soil moisture sensor and a nitrogen, phosphorus and potassium sensor. The conductivity sensor is used to continuously monitor the conductivity value of the solution, the water level sensor is used to monitor the water level of the seedling bed and the water inlet module, the soil moisture sensor is used to monitor the water content of the soil of the seedlings in the seedling bed, and the nitrogen, phosphorus and potassium sensor measures the ion concentration of nitrogen, phosphorus and potassium components contained in the nutrient solution of the water inlet module.

6. The tidal irrigation water and fertilizer integrated system according to claim 1, characterized in that: The water inlet module includes a clean water storage tank, a nutrient solution storage tank, a power pump, a first tee, a second tee and a third tee. Valves are provided at the liquid outlets of the clean water storage tank and the nutrient solution storage tank. The first inlet end of the first tee is connected to the liquid outlet of the clean water storage tank through a pipeline, and the second inlet end of the first tee is connected to the liquid outlet of the nutrient solution storage tank. The liquid inlet of the power pump is connected to the outlet end of the first tee through a pipeline, and the liquid outlet of the power pump is connected to the inlet end of the second tee through a pipeline, and the first outlet end of the second tee is connected to the liquid inlet of the seedling bed through a pipeline. There is at least one third tee, which is arranged on the pipeline between the second tee and the seedling bed, and a valve is provided at the first outlet end of the second tee, the second outlet end of the second tee is connected to the liquid inlet of the nutrient solution storage tank through a pipeline, and a valve is provided at the second outlet end of the second tee. A valve is provided at the liquid inlet of each layer of seedling bed.

7. The tidal irrigation water and fertilizer integrated system according to claim 6, characterized in that: The medicine mixing module includes a power mixing pump and a fertilizer mother liquid storage tank. The liquid outlet of the fertilizer mother liquid storage tank and the second outlet end of the second three-way are respectively connected to the two liquid inlets of the power mixing pump. A proportional regulating valve is provided between the fertilizer mother liquid storage tank and the power mixing pump, and the liquid outlet of the power mixing pump is connected to the nutrient solution storage tank.

8. The tidal irrigation water and fertilizer integrated system according to claim 6, characterized in that: The drainage module includes a fourth tee and a fifth tee, the liquid outlet of the seedbed is provided with a valve, the fifth tee is connected to the liquid outlet of the seedbed, there is at least one fourth tee, and the fourth tee is provided on the pipeline between the fifth tee and the seedbed, the first outlet end of the fifth tee is connected to the liquid inlet of the clean water storage tank through a pipeline, and a valve is provided at the first outlet end of the fifth tee, the second outlet end of the fifth tee is connected to the liquid inlet of the nutrient solution storage tank through a pipeline, and a valve is provided at the second outlet end of the fifth tee.

9. A dynamic control method, implemented based on the tidal irrigation water-fertilizer integrated system according to any one of claims 1 to 8, characterized in that: The method includes an automatic control state and a manual control state, wherein the automatic control state and the manual control state include a monitoring mode, a clean water irrigation mode, a nutrient solution irrigation mode, a mixing mode and a flushing mode; The clean water irrigation mode includes: opening the valve of the liquid outlet of the clean water storage tank, closing the valve of the liquid outlet of the nutrient solution storage tank, and turning on the power pump, then opening the valve at the first outlet end of the second tee, closing the valve at the second outlet end of the second tee, and then opening the valve of the seedling bed inlet. Water flows out of the liquid outlet of the clean water storage tank, passes through the first tee, then passes through the power pump, and then flows upward through the valve at the first outlet end of the second tee, then flows through the pipeline to reach the valve of the seedling bed inlet, and finally reaches the seedling bed; the water level sensor of the seedling bed is used to monitor the water level, and when the water level reaches the level that completely covers the soil, the water is stopped. Irrigation: First, close the valve at the liquid inlet of the seedling bed, then close the power pump and the valve at the liquid outlet of the clean water storage tank; by monitoring the value of the soil moisture sensor, when the humidity reaches the preset value, start the clean water recovery mode, open the valve at the liquid outlet of the seedling bed and the valve at the first outlet end of the fifth tee, and the water in the seedling bed flows through the valve at the liquid outlet of the seedling bed by gravity, then passes through the fourth tee and the fifth tee, and then passes through the valve at the first outlet end of the fifth tee, and finally flows back to the clean water storage tank. After draining, close the valve at the liquid outlet of the seedling bed and the valve at the first outlet end of the fifth tee; The nutrient solution irrigation mode includes: first opening the valve of the liquid outlet of the nutrient solution storage tank, closing the valve of the liquid outlet of the clean water storage tank, and turning on the power pump, then opening the valve at the first outlet end of the second tee, closing the valve at the second outlet end of the second tee, and then opening the valve of the seedling bed inlet, the nutrient solution flows out from the liquid outlet of the nutrient solution storage tank, passes through the first tee, then passes through the power pump, and then flows upward through the valve at the first outlet end of the second tee, then flows through the pipeline to reach the valve of the seedling bed inlet, and finally reaches the seedling bed; the water level sensor of the seedling bed is used to monitor the water level, and the water level is stopped when the water level reaches the level that completely covers the soil. Irrigation: First, close the valve at the liquid inlet of the seedling bed, then close the power pump and the valve at the liquid outlet of the nutrient solution storage tank; by monitoring the value of the conductivity sensor, after reaching the preset value standard, start the nutrient solution recovery mode, open the valve at the liquid outlet of the seedling bed and the valve at the second outlet end of the fifth tee, and the nutrient solution in the seedling bed flows through the valve at the liquid outlet of the seedling bed by gravity, then passes through the fourth tee and the fifth tee, and then passes through the valve at the second outlet end of the fifth tee, and finally flows back to the nutrient solution storage tank. After draining, close the valve at the liquid outlet of the seedling bed and the valve at the second outlet end of the fifth tee; The mixing mode includes: opening the valve at the outlet of the nutrient solution storage tank, closing the valve at the outlet of the clean water storage tank, and opening the power pump, then opening the valve at the second outlet end of the second tee, closing the valve at the first outlet end of the second tee, and the low-concentration nutrient solution flows out from the outlet of the nutrient solution storage tank, passes through the first tee, and then passes through the power pump, and then passes through the valve at the second outlet end of the second tee to the side, and then passes through the power mixing pump. The bottom of the power mixing pump is connected to the fertilizer mother liquid storage tank, and the nutrient solution and mother liquid are fully and evenly mixed according to the proportion through water power, and then return to the nutrient solution storage tank. At the same time, the concentration of the nutrient solution storage tank is detected. If the nitrogen, phosphorus and potassium reach the preset value, the mixing mode is stopped, and the valve at the second outlet end of the second tee is closed, and the valve at the first outlet end of the second tee is opened, and then the valve at the liquid inlet of the seedling bed is opened. The nutrient solution is passed through the valve at the first outlet end of the second tee by the power pump, and then flows through the pipeline to the valve at the seedling bed liquid inlet, and finally reaches the seedling bed; by monitoring the water level sensor of the seedling bed, after the water level reaches the water level that completely covers the soil, the irrigation is stopped, the valve at the seedling bed liquid inlet is closed first, and then the power pump and the valve at the liquid outlet of the nutrient solution storage tank are closed; by monitoring the value of the conductivity sensor, after reaching the preset value standard, the nutrient solution recovery mode is started, the valve at the seedling bed liquid outlet and the valve at the second outlet end of the fifth tee are opened, and the nutrient solution in the seedling bed flows through the valve at the seedling bed liquid outlet by gravity, and then passes through the fourth and fifth tees, and then passes through the valve at the second outlet end of the fifth tee, and finally is discharged back to the nutrient solution storage tank. After draining, the valve at the seedling bed liquid outlet and the valve at the second outlet end of the fifth tee are closed.

10. The dynamic control method according to claim 9, characterized in that: The flushing mode includes: opening the valve at the liquid outlet of the clean water storage tank, closing the valve at the liquid outlet of the nutrient solution storage tank, and opening the valve at the first outlet end of the second tee, closing the valve at the second outlet end of the second tee, and then opening the valve at the seedling bed liquid inlet, the valve at the seedling bed liquid outlet and the valve at the first outlet end of the second tee, and then turning on the power pump, and clean water flows out from the liquid outlet of the clean water storage tank, passes through the first tee, and then passes through the power pump, and then flows upward through the valve at the first outlet end of the second tee, and then flows through the pipeline to reach the valve at the seedling bed liquid inlet, and finally reaches the seedling bed, and at the same time, the power of the power pump is dynamically adjusted according to the water level height provided by the water level sensor in the seedling bed.

Images