Water and fertilizer integrated intelligent greenhouse control system

Abstract

The invention relates to the field of agricultural intelligent irrigation, and particularly discloses a water and fertilizer integrated intelligent greenhouse control system, which comprises an environment sensor module, a central controller, a water and fertilizer integrated machine and a drip irrigation system, and is characterized in that the central controller processes and analyzes real-time data transmitted by the environment sensor module and formulates a regulation and control strategy; the water and fertilizer all-in-one machine comprises a mixing valve, a peristaltic pump and a control panel, the dropper irrigation system is connected with the peristaltic pump, and the central controller generates a control signal u (t) by using a preset target soil moisture value and an actually measured soil moisture value collected by the environment sensor module and adopting a PID control algorithm so as to adjust the output of the peristaltic pump in the water and fertilizer all-in-one machine. The peristaltic pump is used for accurately controlling the water and fertilizer mixed liquid, uniform irrigation is achieved through the dropper irrigation system, the problems that existing greenhouse irrigation and fertilization are separated, resources are wasted, and control is inaccurate are effectively solved, and the agricultural production efficiency and the crop yield are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of agricultural intelligent irrigation, and specifically to an intelligent greenhouse control system for integrated water and fertilizer management. Background Art

[0002] With the continuous development and innovation of agricultural technologies, the abnormally changeable climate conditions and the rapid growth of vegetable supply demands, the planting area of protected agriculture has increased significantly. At the same time, protected agriculture has developed from simple greenhouse greenhouses to an intelligent and refined ecological agriculture model with artificial intelligence control and even mobile terminal control.

[0003] In modern agriculture, especially in the field of greenhouse cultivation, the demand of crops for water and nutrients shows a high degree of spatio-temporal dynamics. Traditional greenhouse irrigation and fertilization methods usually adopt separate irrigation systems and chemical fertilizer spraying or topdressing methods. Due to the mismatch in supply time, quantity, and distribution uniformity between the two, crops may obtain excessive water and insufficient nutrients in a certain period, thereby reducing the water and fertilizer utilization efficiency and possibly causing diseases or root damage. In addition, the separate operation increases the management difficulty, relying on manual monitoring and adjustment, which is not only time-consuming and laborious but also difficult to achieve precise control. At present, there are also some greenhouses that use water and fertilizer integrated machines for greenhouse irrigation. However, there is not much connection between the water and fertilizer integrated machines, greenhouses, and farmers. They can only select the raw material ratio for water and fertilizer mixing, and cannot select the fertilizer concentration suitable for the current growth of crops according to the actual growth situation of crops. Moreover, they cannot collect data, and the degree of intelligence is too low. This is not conducive to future agricultural research and agricultural development. At the same time, farmers cannot clearly understand the relevant data of the agricultural production site, and cannot take timely remedies in case of emergencies, resulting in some unnecessary losses. This is a very severe test for agricultural production with relatively low profits.

[0004] Therefore, there is still a large room for improvement in the automation, accuracy, and resource utilization rate of the existing greenhouse irrigation and fertilization systems. In view of the above problems, the present invention proposes an intelligent greenhouse control system for integrated water and fertilizer management to solve the above problems. Summary of the Invention

[0005] In view of the existing problems, the present invention provides an intelligent greenhouse control system for integrated water and fertilizer management, which can effectively solve the problems raised in the background art.

[0006] To solve the above problems, the present invention adopts the following technical solutions:

[0007] An intelligent greenhouse control system for integrated water and fertilizer management, comprising:

[0008] An environmental sensor module, which is used to collect various environmental indicators and crop growth status in the greenhouse in real time;

[0009] A central controller, which is used to process and analyze the real-time data transmitted by the environmental sensor module and formulate a regulation strategy;

[0010] A water and fertilizer integrated machine, which includes a mixing valve, a peristaltic pump and a control board. The control board monitors the working states of the peristaltic pump and the mixing valve in real time, returns the feedback data to the central controller, and realizes closed-loop control;

[0011] A drip irrigation system, which is connected to the peristaltic pump and is used for drip irrigation of greenhouse crops;

[0012] The central controller uses the preset target soil moisture value and the measured soil moisture value collected by the environmental sensor module to calculate the error e(t) between the preset target soil moisture value of the crop and the measured soil moisture value, and adopts a PID control algorithm to generate a control signal u(t) to adjust the output of the peristaltic pump in the water and fertilizer integrated machine, ensuring accurate regulation of the flow rate of the water and fertilizer mixture and quickly eliminating the deviation. Among them,

[0013]

[0014] e(t) = M set - M actual (2)

[0015] Among them, u(t) is a control signal, which is used to adjust the output of the peristaltic pump;

[0016] M set is the preset target soil moisture value, M actual is the measured soil moisture value, and t is the time variable;

[0017] K p is the proportional gain, which amplifies the current error, K i is the integral gain, which is used to accumulate the past errors, so as to eliminate, K i 、K d is determined by experimental debugging according to the on-site conditions;

[0018] The control signal u(t) is used to adjust the working state of the peristaltic pump in real time according to the deviation of the soil moisture, ensuring that the water and fertilizer supply system can quickly and stably adjust the actual moisture to the target value, avoiding overshoot or response lag, so as to achieve precise irrigation.

[0019] As a further solution of the present invention: The environmental sensor module includes a temperature and humidity sensor, a soil moisture sensor, a light sensor and a nutrient detection sensor, which are used to collect data on temperature, humidity, soil moisture, light and nutrient concentration in the greenhouse in real time.

[0020] As a further aspect of the present invention: The water and fertilizer integrated machine further includes a water tank and a fertilizer storage tank. The water tank and the fertilizer storage tank are connected to a mixing valve through a delivery pipe. The mixing valve is connected to a peristaltic pump through a delivery pipe. The mixing valve adjusts the mixing ratio of water and fertilizer according to the instructions of the central controller, and the peristaltic pump realizes precise delivery by rolling and squeezing a rubber tube.

[0021] As a further aspect of the present invention: The drip irrigation system includes a main water pipe, branch pipes and a plurality of drip heads. One end of the branch pipe is fixedly connected to the main water pipe, and the other end of the branch pipe is fixedly connected to the drip head. The main water pipe is connected to the output end of the peristaltic pump.

[0022] As a further aspect of the present invention: It further includes a compensation module. The compensation module is connected to the central controller, and the compensation module is used for dynamically adjusting the water and fertilizer mixing ratio and the fertilizer concentration.

[0023] As a further aspect of the present invention: The compensation module has a water and fertilizer ratio compensation formula, and the water and fertilizer ratio compensation formula is:

[0024]

[0025] Wherein, R is the actual water and fertilizer ratio, Q w and Q f are the water and fertilizer flow rates respectively, R set is the preset ideal water and fertilizer ratio, and η is the water and fertilizer ratio compensation coefficient, which is used to adjust the supply ratio according to the water deviation;

[0026] When the actual soil moisture is lower or higher than the preset value, the supply ratio of water and fertilizer is automatically adjusted according to the deviation, ensuring that even when the environment or equipment state changes, the crop can obtain the best water and fertilizer ratio, avoiding under-supply or over-supply.

[0027] As a further aspect of the present invention: The compensation module has a fertilizer concentration compensation formula, and the fertilizer concentration compensation formula is:

[0028] C adj = C set + α(N set - N actual ) + β(T set - T actual ) (4)

[0029] Wherein, C adj is the adjusted fertilizer concentration, C set is the basic fertilizer concentration setting value, N set and N actua are the soil target nutrient concentration and the soil measured nutrient concentration respectively, T set and T actualwhere \(T_0\) is the target environmental temperature and \(T\) is the actual environmental temperature, and \(\alpha\) and \(\beta\) are the nutrient compensation coefficient and temperature compensation coefficient respectively;

[0030] Dynamically adjust the fertilizer concentration in the mixed solution to ensure stable and appropriate nutrient supply under different environmental conditions, optimize the crop absorption efficiency and prevent growth problems caused by concentration deviation.

[0031] As a further aspect of the present invention: the preset ideal water-fertilizer ratio \(R\) set is 200 - 500, the water-fertilizer ratio compensation coefficient \(\eta\) is 0.05 - 0.5, the set value \(C\) of the basic fertilizer concentration set is 100 - 300 mg / L, the nutrient compensation coefficient \(\alpha\) is 0.1 - 1.0, and the temperature compensation coefficient \(\beta\) is 0.5 - 2.0 mg / L / °C.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention detects the soil moisture or nutrients in the greenhouse through the environmental sensor module and transmits the signal to the central controller. After the central controller processes the data, it issues a control signal to start the water-fertilizer supply to the control board of the water-fertilizer integration machine. After receiving the signal, the control board starts the mixing valve and the peristaltic pump, and adjusts the ratio and flow rate of the mixed liquid according to the water demand and nutrient requirements of the crops. Under precise control, the peristaltic pump squeezes the rubber hose to send the mixed liquid into the pipeline system, and then the drip irrigation system evenly distributes the mixed liquid to the roots of each crop. The present invention integrates the water-fertilizer integration machine and the intelligent control system, precisely controls the water-fertilizer mixed liquid by using the peristaltic pump, and realizes uniform irrigation by means of the drip irrigation system, effectively solving the problems of separate irrigation and fertilization, resource waste and inaccurate control in the existing greenhouse, and significantly improving the agricultural production efficiency and crop yield. Brief Description of the Drawings

[0033] Figure 1 is a schematic diagram of the overall structure of an intelligent greenhouse control system for water-fertilizer integration;

[0034] Figure 2 is a schematic diagram of the structure of the water-fertilizer integration machine in an intelligent greenhouse control system for water-fertilizer integration;

[0035] Figure 3 is a schematic diagram of the structure of the drip irrigation system in an intelligent greenhouse control system for water-fertilizer integration.

[0036] In the figure: 1. Environmental sensor module; 11. Temperature and humidity sensor; 12. Soil moisture sensor; 13. Light sensor; 14. Nutrient detection sensor; 2. Central controller; 3. Water and fertilizer integrated machine; 31. Water tank; 32. Fertilizer storage tank; 33. Mixing valve; 34. Peristaltic pump; 35. Control board; 4. Drip irrigation system; 41. Main water pipe; 42. Branch pipe; 43. Dripper; 5. Compensation module. Specific implementation mode

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] Combined with Figures 1 to 3 Describing this implementation mode, this implementation mode provides an intelligent greenhouse control system for integrated water and fertilizer, which includes an environmental sensor module 1, a central controller 2, a water and fertilizer integrated machine 3 and a drip irrigation system 4. The environmental sensor module 1 includes a temperature and humidity sensor 11, a soil moisture sensor 12, a light sensor 13 and a nutrient detection sensor 14, which are used to collect data on temperature, humidity, soil moisture, light and nutrient concentration in the greenhouse in real time. The temperature and humidity sensor 11 is selected from DHT22 or SHT31 and installed at a representative position in the greenhouse to avoid direct sunlight. The soil moisture sensor 12 is selected from a capacitive soil humidity sensor and buried in the soil near the root zone of the crop. The light sensor 13 is selected from a photoresistor or a light intensity sensor and placed at a position that can represent the lighting conditions of the entire greenhouse. The nutrient detection sensor 14 is selected from an offline water sample detection device or an online electrode sensor (such as a conductivity sensor) to monitor the nutrient concentration in the solution. The data of each sensor is collected at a fixed period (such as 1 - 5 seconds), and is filtered and corrected. Average value or median filtering is used to eliminate instantaneous noise. The data is stored inside the central controller 2 and remote monitoring is realized through the communication module.

[0039] The central controller 2, acting as the brain of the system, is responsible for collecting sensor data, calculating errors, executing PID and compensation algorithms, and generating control instructions. It is used to process and analyze the real-time data transmitted by the environmental sensor module 1, and formulate regulation strategies. The central controller 2 selects the STM32 series based on the ARM architecture, Arduino Mega or Raspberry Pi of the central controller 2, selects appropriate computing power and I / O ports according to the system complexity, and is equipped with a wireless communication module (such as WiFi, ZigBee or LoRa) to achieve data transmission and remote monitoring, and allocates sufficient analog inputs and digital I / O ports for collecting sensor signals and controlling actuators such as the peristaltic pump 34 and the mixing valve 33, and retains serial ports or I2C and SPI bus interfaces for subsequent expansion of other modules (such as data storage, display screens, etc.).

[0040] The water and fertilizer integrated machine 3 includes a water tank 31, a fertilizer storage tank 32, a mixing valve 33, a peristaltic pump 34 and a control board 35. The control board 35 is equipped with a microcontroller as an auxiliary to monitor the pump speed and the state of the mixing valve 33 in real time and feedback to the central controller 2. The water tank 31 and the fertilizer storage tank 32 are made of corrosion-resistant material containers to ensure stable storage of the liquid. The water tank 31 and the fertilizer storage tank are connected to the mixing valve 33 through a delivery pipe. The mixing valve 33 is connected to the peristaltic pump 34 through a delivery pipe. The mixing valve 33 adjusts the mixing ratio of water and fertilizer according to the instructions of the central controller 2. The peristaltic pump 34 achieves precise delivery by rolling the roller to squeeze the rubber tube. The control board 35 monitors the working states of the peristaltic pump 34 and the mixing valve 33 in real time and returns the feedback data to the central controller 2 to achieve closed-loop control. Clean water and fertilizer are sent into the mixing valve 33 through separate pipelines, and the mixed liquid is transported to the drip irrigation system 4 through the peristaltic pump 34.

[0041] The drip irrigation system 4 includes a main water pipe 41, branch pipes 42 and a plurality of drip heads 43. One end of the branch pipe 42 is fixedly connected to the main water pipe 41, and the other end of the branch pipe 42 is fixedly connected to the drip head 43. The main water pipe 41 is connected to the output end of the peristaltic pump 34. The water and fertilizer mixture regulated by the peristaltic pump 34 is evenly transported to the roots of each crop through the pipeline system to ensure the precise supply of water and nutrients and avoid growth problems caused by local excess or deficiency. The main water pipe 41 is laid along the main line of the greenhouse, the branch pipes 42 are distributed to each planting area, and the drip heads 43 are evenly installed according to the crop row spacing and root system distribution to ensure the balanced distribution of the water and fertilizer mixture in each area. And a pressure regulating device can be optionally installed to ensure the stability of the system pressure and prevent the drip heads 43 from being blocked due to insufficient water pressure.

[0042] The central controller 2 calculates the error e(t) between the preset target soil moisture value and the measured soil moisture value collected by the environmental sensor module 1, and uses the PID control algorithm to generate a control signal u(t) to adjust the output of the peristaltic pump 34 in the water and fertilizer integrated machine 3, ensuring accurate regulation of the flow rate of the water and fertilizer mixture and quickly eliminating the deviation. Among them,

[0043]

[0044] e(t) = M set - M actual (2)

[0045] Among them, u(t) is the control signal used to adjust the output of the peristaltic pump 34; e(t) is the error signal used to measure the difference between the preset target soil moisture value and the measured soil moisture value;

[0046] M set is the preset target soil moisture value, M actual is the measured soil moisture value, and t is the time variable.

[0047] K p is the proportional gain, which amplifies the current error. K i is the integral gain, which is used to accumulate past errors to eliminate the steady-state deviation. K d is the derivative gain, which is used to estimate the trend of error change, playing a role in suppressing oscillation and early response. K p 、K i 、K d are determined by experimental debugging according to the on-site conditions;

[0048] When the measured soil moisture value is lower than the preset target soil moisture value, e(t) is positive, indicating that water supply needs to be increased; conversely, when e(t) is negative, water supply needs to be reduced.

[0049] The proportional term K p .e(t) directly amplifies according to the current error, quickly responding to the deviation; the integral term accumulates historical errors, which is used to eliminate long-term steady-state deviations and ensure that the target is achieved in the long term; the derivative term estimates the future trend according to the error change rate, playing a role in suppressing system oscillation and improving the response speed.

[0050] The control signal u(t) is used to adjust the working state of the peristaltic pump 34 in real time according to the deviation of soil moisture, ensuring that the water and fertilizer supply system can quickly and stably adjust the actual moisture to the target value, avoiding overshoot or response lag, so as to achieve precise irrigation.

[0051] After the peristaltic pump 34 adjusts its output according to u(t), the sensor collects the latest moisture data again, recalculates the error, forms a closed-loop control. Through continuous iteration, the system can make the actual output approach the target value in a relatively short time, while reducing overshoot and oscillation.

[0052] The target soil moisture M of crops in an existing greenhouse set is 30%, and the actual measured value M actual is 25%, the error e(t) = 5, set K p = 1.0, K i = 0.1, K d = 0.05. In one sampling:

[0053] Proportional term: 1.0 × 5 = 5;

[0054] Integral term: Assuming the integral of historical errors is 10, then the contribution is 0.1 × 10 = 1;

[0055] Derivative term: If the current error change rate is 2, then the contribution is 0.05 × 2 = 0.1;

[0056] Then u(t) = 5 + 1 + 0.1 = 6.1.

[0057] The control system converts the signal of 6.1 into an appropriate PWM duty cycle or voltage value, so that the peristaltic pump 34 works faster and increases the output of the water-fertilizer mixed liquid. As the actual soil moisture gradually reaches 30%, the error e(t) gradually decreases, and the PID output u(t) also decreases accordingly until the system stabilizes.

[0058] Based on the closed-loop regulation method of PID control, the system can respond to environmental changes in real time and automatically correct deviations, so as to achieve precise and dynamic water-fertilizer supply.

[0059] In the intelligent greenhouse water-fertilizer integration control system, in order to achieve precise water-fertilizer supply for crops, it is necessary to dynamically adjust the water-fertilizer mixing ratio and fertilizer concentration according to the real-time monitored data. A compensation module 5 is also provided. The compensation module 5 is connected to the central controller 2, and the compensation module 5 is used to dynamically adjust the water-fertilizer mixing ratio and fertilizer concentration.

[0060] The compensation module 5 has a water-fertilizer ratio compensation formula, and the water-fertilizer ratio compensation formula is:

[0061]

[0062] Among them, R is the actual water-fertilizer ratio, Q w and Q f are the water and fertilizer flow rates respectively, R set is the preset ideal water-fertilizer ratio, and η is the water-fertilizer ratio compensation coefficient, which is used to adjust the supply ratio according to the moisture deviation;

[0063] When the actual soil moisture is lower than or higher than the preset value, automatically adjust the supply ratio of water and fertilizer according to the deviation to ensure that the crop can obtain the optimal water-fertilizer ratio even when the environment or equipment status changes, and avoid insufficient or excessive supply.

[0064] The compensation module 5 has a fertilizer concentration compensation formula, and the fertilizer concentration compensation formula is:

[0065] C adj = C set + α(N set - N actual ) + β(T set - T actual )(4)

[0066] Where C adj is the adjusted fertilizer concentration, C set is the basic fertilizer concentration setting value, N set and N actua are the soil target nutrient concentration and the measured soil nutrient concentration respectively, T set and T actual are the target environmental temperature and the actual environmental temperature, and α and β are the nutrient compensation coefficient and the temperature compensation coefficient respectively;

[0067] Dynamically adjust the fertilizer concentration in the mixed solution to ensure a stable and appropriate nutrient supply under different environmental conditions, optimize the crop absorption efficiency and prevent growth problems caused by concentration deviation.

[0068] The preset ideal water-fertilizer ratio R set is 200 - 500. This ratio is the ideal ratio of water flow to fertilizer flow, which can usually be determined according to the water and fertilizer requirements of the crop. The common reference value is about 300. The water-fertilizer ratio compensation coefficient η is 0.05 - 0.5, which is used to dynamically adjust the water-fertilizer ratio according to the soil moisture deviation. The magnitude of this value should be determined based on the measurement unit of the soil moisture data and the regulation sensitivity to ensure a moderate adjustment amount. The basic fertilizer concentration setting value C setIt is 100 - 300 mg / L, determined according to the basic nutrient requirements of crops. The actual value can be adjusted according to the growth stages of different crops and fertilization strategies. The nutrient compensation coefficient α is 0.1 - 1.0, which is used to convert the difference between the target and actual nutrient concentrations into the fertilizer concentration adjustment amount. Its value should be determined in combination with the actual detection accuracy and crop absorption characteristics. The temperature compensation coefficient β is 0.5 - 2.0 mg / L / °C, which is used to compensate for the error caused by the influence of environmental temperature changes on the fertilizer concentration. The specific value needs to be determined according to the influence degree of temperature changes on fertilizer dissolution and fluidity. The above parameter values are only for preliminary reference. It is recommended to further calibrate through on-site tests and data feedback during actual application to achieve the best water and fertilizer supply effect. Specifically, for the PID parameter debugging of the central controller 2, initially use a low gain value and gradually adjust K p 、K i 、K d until the system overshoot and oscillation are eliminated. Determine the reasonable ranges of R set 、η、C set 、α、β through on-site tests to ensure that the mixture ratio and fertilizer concentration meet the crop requirements.

[0069] The working principle of the present invention is as follows: The environmental sensor module 1 transmits the collected environmental parameters to the central controller 2 by wired or wireless means. After receiving the data, the central controller 2 performs analysis and calculation to determine the optimal water and fertilizer supply plan. The central controller 2 sends the calculated control instructions to the water and fertilizer integration machine 3 by wired or wireless means. The water and fertilizer integration machine 3 adjusts the water and fertilizer ratio according to the instructions, mixes them and then transports them through the pipeline to the drip irrigation system 4. The drip irrigation system 4 evenly transports the water and fertilizer mixed solution to the roots of the crops to complete the irrigation process. By integrating the water and fertilizer integration machine 3 and the intelligent control system, the peristaltic pump 34 is used to precisely control the water and fertilizer mixture, and uniform irrigation is achieved with the help of the drip irrigation system 4, effectively solving the problems of separate irrigation and fertilization, resource waste and inaccurate control in existing greenhouses, and significantly improving agricultural production efficiency and crop yields.

[0070] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0071] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-fertilizer integrated intelligent greenhouse control system, characterized in that: include: Environmental sensor module, which is used to collect various environmental indicators and crop growth status in the greenhouse in real time; The central controller is used to process and analyze the real-time data transmitted by the environmental sensor module and formulate control strategies; The integrated water and fertilizer machine includes a mixing valve, a peristaltic pump and a control panel. The control panel monitors the working status of the peristaltic pump and the mixing valve in real time, and returns the feedback data to the central controller to realize closed-loop control. A drip irrigation system, which is connected to a peristaltic pump and is used for drip irrigation of greenhouse crops; The central controller uses the preset target soil moisture value and the measured soil moisture value collected by the environmental sensor module to calculate the error e(t) between the preset target soil moisture value and the measured soil moisture value of the crop, and uses the PID control algorithm to generate a control signal u(t) to adjust the output of the peristaltic pump in the water-fertilizer integrated machine to ensure accurate control of the flow of the water-fertilizer mixture and quickly eliminate the deviation, wherein, e(t)=M set - M actual (2) Among them, u(t) is the control signal, which is used to adjust the peristaltic pump output; M set is the preset target soil moisture value, M actual is the measured soil moisture value, t is the time variable; K p is the proportional gain, K i is the integral gain, K d is the differential gain.

2. According to claim 1, a water-fertilizer integrated intelligent greenhouse control system is characterized in that: The environmental sensor module includes a temperature and humidity sensor, a soil moisture sensor, a light sensor and a nutrient detection sensor, which are used to collect real-time data on temperature, humidity, soil moisture, light and nutrient concentration in the greenhouse.

3. The water-fertilizer integrated intelligent greenhouse control system according to claim 1 is characterized in that: The water-fertilizer integrated machine also includes a water tank and a fertilizer storage tank, which are connected to a mixing valve through a delivery pipe, and the mixing valve is connected to a peristaltic pump through a delivery pipe. The mixing valve adjusts the mixing ratio of water and fertilizer according to the instructions of the central controller, and the peristaltic pump realizes precise delivery by squeezing a rubber tube through a roller.

4. The water-fertilizer integrated intelligent greenhouse control system according to claim 3 is characterized in that: The drip irrigation system comprises a main water pipe, a branch pipe and a plurality of drippers, one end of the branch pipe is fixedly connected to the main water pipe, the other end of the branch pipe is fixedly connected to the dripper, and the main water pipe is connected to the output end of the peristaltic pump.

5. The water-fertilizer integrated intelligent greenhouse control system according to claim 1 is characterized in that: It also includes a compensation module, which is connected to the central controller and is used to dynamically adjust the water-fertilizer mixing ratio and the fertilizer concentration.

6. The water-fertilizer integrated intelligent greenhouse control system according to claim 5 is characterized in that: The compensation module has a water-fertilizer ratio compensation formula, which is: Among them, R is the actual water-fertilizer ratio, Q w and Q f are water and fertilizer flow, R set is the preset ideal water-fertilizer ratio, and η is the water-fertilizer ratio compensation coefficient, which is used to adjust the supply ratio according to the moisture deviation.

7. The water-fertilizer integrated intelligent greenhouse control system according to claim 6 is characterized in that: The compensation module has a fertilizer concentration compensation formula, which is: C adj =C set +α(N set -N actual )+β(T set -T actual ) (4) Among them, C adj is the adjusted fertilizer concentration, C set is the basic fertilizer concentration setting value, N set With N actua are the target soil nutrient concentration and the measured soil nutrient concentration, T set With T actual are the target ambient temperature and the actual ambient temperature, α and β are the nutrient compensation coefficient and temperature compensation coefficient respectively.

8. The water-fertilizer integrated intelligent greenhouse control system according to claim 7 is characterized in that: The preset ideal water-fertilizer ratio R set is 200-500, the water-fertilizer ratio compensation coefficient η is 0.05-0.5, and the basic fertilizer concentration setting value C set The nutrient compensation coefficient α is 0.1-1.0, and the temperature compensation coefficient β is 0.5-2.0 mg / L / °C.

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