CN110989704A - Intelligent crop nutrition real-time supply and regulation system - Google Patents
Intelligent crop nutrition real-time supply and regulation system Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
- G05D11/135—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by sensing at least one property of the mixture
- G05D11/138—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by sensing at least one property of the mixture by sensing the concentration of the mixture, e.g. measuring pH value
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Abstract
The invention provides an intelligent crop nutrition real-time supply and regulation system, which comprises an ion concentration sensor, a processor, a memory, a monitoring unit and a regulation device, wherein the ion concentration sensor is connected with the processor; the ion concentration sensor is used for measuring the ion concentration of the crop growth nutrient solution or the crop growth substrate according to a certain time interval; the ion concentration sensor transmits the measured data to the processor, the processor analyzes and processes the measured data and feeds back the processing result to the monitoring unit, and the monitoring unit controls the regulation and control device to be opened and closed according to the comparison result so as to regulate the ion concentration of the crop growth nutrient solution or the crop growth substrate; the processor is connected with a memory, and the memory is used for storing data measured by the ion concentration sensor; the processor is connected with a display which is used for showing the ion concentration of the crop growth nutrient solution or the substrate in a form of a broken line graph. This application has realized planting to the intelligent management and control of crops, has reduced green pollution, has reduced the planting cost.
Description
Technical Field
The invention relates to the technical field of intelligent control of crop growth, in particular to an intelligent crop nutrition real-time supply and regulation system.
Background
In recent years, the usage amount of chemical fertilizers put into agricultural cultivation in China is more than 4000 ten thousand tons all the time. In the 80 th of the 20 th century, the contribution rate of the use of the fertilizer to the grain yield increase of China is about 46.3%, and the application of the fertilizer greatly promotes the production of crops in China. However, by the end of the 90 s of the 20 th century, the crop yield in China can not wander while the fertilizer input is in a straight line increase. According to statistics, in 1996 + 2009, the fertilizer usage amount in China is increased by 41.2%, the total grain yield is increased by only 5.1%, and the grain yield is not continuously increased by increasing the fertilizer input. The utilization rate of the nitrogenous fertilizer in China in season is only 30% -35%. The season utilization rate of the chemical fertilizer in China is 30% on average, which is far lower than the level of 60% -70% in developed countries in Europe and America, and the utilization rate of the chemical fertilizer in China also tends to decline in recent years. Taking nitrogen fertilizer as an example, the utilization rate of nitrogen fertilizer is about 35% on average in 90 s of 20 th century, and is reduced to about 27% nowadays. Therefore, the utilization rate of the fertilizer in China is lower than the international level. By analyzing the reasons, the method can see that the effective utilization rate of the chemical fertilizer in China is low, and further causes serious environmental pollution and economic loss.
Along with the continuous development and progress of society, the living standard of people is greatly improved. People have green and safe requirements on edible agricultural products, and the requirements can be further improved along with the living standard. In the planting of crops, improper application of chemical fertilizers can not only cause harmful substances such as nitrate and the like in the crops, but also cause a plurality of adverse phenomena such as plant diseases and the like. At present, the main reasons for the high nitrate content in vegetables are: (1) the nitrogen fertilizer is applied in excess. (2) If the nitrogen fertilizer is applied for a long time, the nutrients of nitrogen, phosphorus and potassium are unbalanced. (3) The harvesting period is unreasonable. In addition, the loss of the effective components of the fertilizer is also an important cause of economic loss and serious environmental pollution, and excessive application of the fertilizer can cause soil hardening and loss of fertility, thereby causing crop yield reduction.
Methods of modifying the above phenomena are increasingly studied and improved, depending on a number of factors. The method for improving the utilization rate of the fertilizer comprises the following steps of (1) applying an organic fertilizer and an inorganic fertilizer in a matching manner; (2) the fertilization method is improved (fertilization is needed due to the need, fertilization is due to the land); (3) improving the fertilization technology (ditching and digging holes, deep fertilizer application and chemical fertilizer mixed application); (4) spreading, balancing, matching and fertilizing; (5) change the fertilization structure, popularize the multielement special fertilizer, etc. However, these methods have the problems of environmental pollution, soil hardening, reduced fertility, resource waste and the like to a certain extent, and increase the investment of manpower and material resources. These deficiencies can lead to reduced yield in the crop and undesirable effects of the crop not meeting the dietary standards.
The intelligent control is a control mode with intelligent information processing, intelligent information feedback and intelligent control decision, is a high-level stage of control theory development, and is mainly used for solving the control problem of a complex system which is difficult to solve by using a traditional method. The main characteristics of an intelligent control research object are a mathematical model with uncertainty, high nonlinearity and complex task requirements.
Intelligent control is widely recognized as an emerging discipline and has gained rapid development. In recent decades, with the development of intelligent control methods and technologies, intelligent control has rapidly moved to various professional fields, and is applied to control problems of various complex controlled objects, such as industrial process control systems, robot systems, modern production manufacturing systems, traffic control systems, and the like. How to combine intelligent control with scientific and reasonable planting of crops becomes a technical problem to be solved by the invention.
Disclosure of Invention
The invention aims to provide an intelligent crop nutrition real-time supply and regulation system aiming at various hidden dangers caused by improper crop application at present.
An intelligent crop nutrition real-time supply and regulation system comprises an ion concentration sensor, a processor, a memory, a monitoring unit and a regulation device;
the ion concentration sensor is used for measuring the ion concentration of the crop growth nutrient solution or substrate according to a certain time interval;
the ion concentration sensor transmits the measured data to the processor, the processor analyzes and processes the measured data and feeds back the processing result to the monitoring unit, and the monitoring unit controls the regulation and control device to be opened and closed according to the comparison result so as to regulate the ion concentration of the crop growth nutrient solution or the crop growth substrate;
the processor is connected with a memory, and the memory is used for storing data measured by the ion concentration sensor;
the processor is connected with a display which is used for showing the ion concentration of the crop growth nutrient solution or the substrate in a form of a broken line graph.
Further, the intelligent crop nutrient real-time supply and regulation system as described above, the processor comprising: a comparison unit for comparing data measured by the ion concentration sensor with normal data;
the judging unit is used for comparing the data measured by the ion concentration sensor with the normal data; if the comparison result is 0, storing the data according to the requirement; if the comparison result is less than 0, the data is stored according to the requirement on one hand, and the information is transmitted to the monitoring unit on the other hand.
Further, the intelligent crop nutrient real-time supply and regulation system as described above, the memory comprises: a crop growth stage storage unit, a daily storage unit and a monthly storage unit;
the crop growth stage storage unit is used for storing data obtained by measurement of the ion concentration sensor according to different growth stages;
the day storage unit is used for storing data obtained by measurement of the ion concentration sensor by taking days as a unit;
the month storage unit is used for storing data measured by the ion concentration sensor according to a month unit.
Further, the intelligent crop nutrition real-time supply and regulation system as described above, the monitoring unit comprises: the voice broadcast ware, when the contrast result that feeds back to the voice broadcast ware is less than the ion concentration of normal crop growth nutrient solution or matrix, the voice broadcast ware carries out the early warning suggestion.
Furthermore, as above-mentioned intelligent crop nutrition supplies in real time and regulates and control system, regulation and control device still is connected with actuating mechanism, and this actuating mechanism is used for driving agitating unit stirring circulation batching pond so that its inside ion concentration is even.
Furthermore, the system for intelligently supplying and regulating the nutrient of the crop in real time further comprises a valve for controlling the opening and closing of nutrient elements and a controller for controlling the opening size of the valve, wherein when the ion concentration of the nutrient solution or the substrate for the crop growth is far lower than the normal concentration, the controller controls the valve to be opened to the maximum; when the ion concentration of the crop growth nutrient solution or substrate is not greatly different from the normal concentration, the controller controls the valve to be opened to a slightly closed state.
Has the advantages that:
this application passes through the ion concentration of ion concentration sensor monitoring crops growth nutrient solution or matrix, and the treater realizes the scientific and reasonable regulation and control to the required nutrient substance of crops growth according to monitoring data control regulation and control device to the demand of intelligence management and control crops has been realized. The system provided by the invention not only realizes intelligent supply, but also realizes real-time and high-efficiency detection, monitors and regulates the concentration of nutrient substances required by crops in nutrient solution or matrix in real time through the control of the intelligent system, and keeps the concentration of the nutrient substances in a normal range all the time, thereby improving the utilization rate of the fertilizer, reducing the fertilizer investment, saving the production cost, achieving the purpose of efficiently utilizing the fertilizer, and simultaneously achieving the requirements of environmental protection.
Drawings
FIG. 1 is a block diagram of the structure of an intelligent real-time crop nutrition supply and regulation system in example 1;
FIG. 2 is a block diagram of the intelligent real-time crop nutrition supply and regulation system in example 2;
FIG. 3 is a block diagram of the intelligent real-time crop nutrition supply and regulation system of embodiment 3;
FIG. 4 is a block diagram of the intelligent real-time crop nutrition supply and regulation system of embodiment 4;
fig. 5 is a flowchart of the intelligent real-time crop nutrition supply and regulation method provided in example 5.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a system which can conveniently, real-timely and accurately detect the concentration of N, P, K, Ca, Mg and trace elements in the environment where the plant is located and can reasonably provide the N, P, K, Ca, Mg and trace element nutrition required by the plant. The system detector is placed in nutrient solution or non-rhizosphere soil or other matrixes where the roots of the plants are located, and the concentration of N, P, K, Ca, Mg and trace elements in the environment where the system detector is located is accurately detected in real time. The data can be transmitted to a software system through a chip, the software system judges the data, issues a command of providing N, P, K, Ca, Mg and trace elements to hardware according to the judgment, and controls the release of the N, P, K, Ca, Mg and trace elements by switching a resistance power supply through the system so as to maintain the N, P, K, Ca, Mg and trace elements in a normal range required by crops. The implementation of the scheme can provide suitable N, P, K, Ca, Mg and trace element nutrition environments for crops in real time, and meanwhile, intelligent regulation and control are achieved, so that not only are human resources saved, but also land resources are saved, the green industrial chain of China is met, and a green environment-friendly sustainable development road is taken.
Example 1:
fig. 1 is a block diagram of the structure of an intelligent real-time crop nutrition supply and regulation system in embodiment 1, and as shown in fig. 1, the system includes an ion concentration sensor, a processor, a memory, a monitoring unit, and a regulation device;
the ion concentration sensor is used for measuring the ion concentration of the crop growth nutrient solution or substrate according to a certain time interval;
the ion concentration sensor transmits the measured data to the processor, the processor analyzes and processes the measured data and feeds back the processing result to the monitoring unit, and the monitoring unit controls the regulation and control device to be opened and closed according to the comparison result so as to regulate the ion concentration of the crop growth nutrient solution or the crop growth substrate;
the processor is connected with a memory, and the memory is used for storing data measured by the ion concentration sensor;
the processor is connected with a display which is used for showing the ion concentration of the crop growth nutrient solution or the substrate in a form of a broken line graph.
The system provided by the invention integrates monitoring, analysis and intelligent supply into a whole, and the system can supply comprehensive nutrition to crops, improve the utilization rate of fertilizer, increase yield and reduce environmental pollution.
Example 2:
fig. 2 is a block diagram of an intelligent real-time crop nutrition supply and regulation system in embodiment 2, and as shown in fig. 2, the system provided by the present invention includes: a comparison unit for comparing data measured by the ion concentration sensor with normal data;
the judging unit is used for comparing the data measured by the ion concentration sensor with the normal data; if the comparison result is 0, storing the data according to the requirement; if the comparison result is less than 0, the data is stored according to the requirement on one hand, and the information is transmitted to the monitoring unit on the other hand.
The intelligent management degree of crop cultivation is further realized through the comparison unit and the judgment unit.
Example 3:
fig. 3 is a block diagram of an intelligent real-time crop nutrition supply and regulation system in embodiment 3, as shown in fig. 3, the memory includes: a crop growth stage storage unit, a daily storage unit and a monthly storage unit;
the crop growth stage storage unit is used for storing data obtained by measurement of the ion concentration sensor according to different growth stages;
the day storage unit is used for storing data obtained by measurement of the ion concentration sensor by taking days as a unit;
the month storage unit is used for storing data measured by the ion concentration sensor according to a month unit.
Through the storage units in different forms, the working personnel can efficiently call the data acquired by the sensor at any time, so that a good foundation is laid for further analysis and research.
Example 4:
fig. 4 is a block diagram of the structure of the intelligent real-time crop nutrition supply and regulation system in embodiment 4, and as shown in fig. 4, the monitoring unit includes: the voice broadcast ware, when the contrast result that feeds back to the voice broadcast ware is less than the ion concentration of normal crop growth nutrient solution or matrix, the voice broadcast ware carries out the early warning suggestion. The regulation and control device is also connected with a driving mechanism, and the driving mechanism is used for driving the stirring device to stir the circulating dosing tank so as to ensure that the ion concentration in the stirring device is uniform. The regulating device also comprises a valve for controlling the opening and closing of nutrient elements and a controller for controlling the opening size of the valve, and when the ion concentration of the growth nutrient solution or the substrate is far lower than the normal concentration, the controller controls the valve to be opened to the maximum; when the ion concentration of the crop growth nutrient solution or substrate is not greatly different from the normal concentration, the controller controls the valve to be opened to a slightly closed state.
Example 5:
fig. 5 is a flowchart of the intelligent real-time crop nutrition supply and regulation method provided in example 5, and as shown in fig. 5, the method can implement the following functions:
real-time concentration: the ion concentration of nutrient elements in the nutrient solution or the matrix is monitored in real time through a sensor, the sensor transmits the measured data to a software system, and the system is displayed on a display in the form of a line graph.
And (3) data recording: the recording of the ion concentration in the nutrient solution or the matrix at different growth stages of crops plays an important role in understanding the overall change trend of the ion concentration in the nutrient solution or the matrix.
Concentration regulation and control: comprises means of monitoring and reminding proper ion concentration and ion concentration required by plants in different growth periods and monitoring ion concentration.
Concentration reminding: and connecting the equipment with the system, and sending the reminding instruction to the equipment by the system. The reminding mode, the volume, the time interval and the like are adjustable.
The system provided by the invention has the following working contents:
(1) connecting the device and entering a software homepage.
(2) Setting proper ion concentrations of nutrient elements in different growth periods, wherein the software does not send out an adjusting instruction within the proper ion concentrations.
(3) The system monitors the concentration of each element ion in the nutrient solution or the substrate at any moment, and if the ion concentration is not in the proper range, the system sends an instruction to the reminding equipment and sends a request for adjusting the ion concentration.
(4) The system continuously supervises the ion concentration in the nutrient solution or the substrate, and is matched with the nutrient solution supply equipment to ensure that the ion concentration in the nutrient solution is always maintained in a proper range.
The intelligent system provided by the invention has the following advantages:
(1) intelligent supply: the software system automatically monitors the concentration content of the nutrient in the crop nutrient solution or substrate, judges whether the concentration of the nutrient is in a normal range so as to determine whether to supply the nutrient or not, and feeds back the information to the control system. When the control system receives a command of supplying nutrient substances, the control system controls the relevant modules to release the required nutrient substances to supplement nutrient solution. When the concentration of the nutrient substances is adjusted to the normal concentration, the control system stops the supply of the corresponding nutrient substances when receiving a command of stopping the supply sent by the software system. Therefore, the aim of supplying the nutrient substances in real time can be achieved when the concentration of the required substances in the nutrient solution is monitored, so that the normal growth of crops is not influenced.
(2) Real-time high efficiency: through the control of an intelligent system, the concentration of the required nutrient substances in the crop nutrient solution or the matrix is monitored and regulated in real time, the concentration of the nutrient substances is always maintained in a normal range, the utilization rate of the fertilizer can be improved, and the aim of efficiently utilizing the fertilizer is fulfilled.
(3) Green and environment-friendly: the whole production process avoids the occurrence of the damage of soil-borne diseases and environmental pollution to crops, so that the produced crops are green and nuisanceless crops. The nutrient substance concentration can be regulated and controlled to the minimum value in the later stage, the nutrient substance can be continuously used after the detection and analysis are qualified, and more surplus nutrient substances cannot exist to pollute the environment, so that the aim of environmental protection is fulfilled.
(4) Real-time regulation and control: the system can regulate and control the content of nutrient substances required by each growth stage of crops in real time through setting system parameters according to the difference of the concentration content of the nutrient substances required by the crops in each growth stage. The fertilizer requirement rules of the crops in different growth stages are accurately regulated and controlled, the requirements of different crops in different growth periods are met, and therefore efficient utilization is achieved.
The system provides a more convenient method for agricultural production, reduces the investment of a large amount of manpower and material resources, and brings higher economic benefit to the industry. The system can monitor and control the concentration of the nutrient substances in the nutrient solution in real time, so that the nutrient substances are always in a normal range, and the produced crops meet the edible standard to achieve the purpose of efficiently utilizing the nutrient substances. The method is based on modern agricultural facilities, has high technological content, fully combines the Internet, has high added value of products, and greatly improves the output rate of limited land and the labor productivity. The method is guided by limited land resources currently used for cultivation and the living needs for green safety, develops a new mode of intelligent crop production, and accords with the trend of social development.
The system can reduce soil-borne diseases and prevent the negative influence of the surplus of nutrient substances in the crop growth nutrient solution or matrix on crops. In the aspect of supplying nutrient substances, the system accurately controls the nutrient substances, and the system supplies nutrient substance concentrations required by crops in different growth periods through a reasonable and scientific method of intelligent control.
Example one, the lettuce nutrient solution is supplied in real time.
Put the sensor of the system into 1m3The inlet and the outlet of the circulating dosing tank are opened every 12 hours to circulate the solution in the circulating dosing tank solution, so that the content of nutrient elements in the nutrient solution can be monitored in real time.
According to the data, the quantity of various nutrient elements (the numerical values of the nutrient elements in the solution) required by each stage of the lettuce is input into a software system by referring to the growth rule of the lettuce.
The software system compares the concentration of the nutrient element ions received from the sensor with an appropriate concentration;
if the concentration of the nutrient ions is within the proper concentration, the software system does not send out an instruction, and if the concentration of certain nutrient ions is lower than the proper concentration, the system sends out an instruction to the reminding equipment and sends out a request for adjusting the ion concentration.
And the deficient nutrient element ions are pumped into the circulating dosing tank, and meanwhile, the stirring device of the circulating dosing tank is opened.
And the system reminds the equipment to send out an instruction of stopping adding the nutrient elements until the concentration of the nutrient element ions received by the software system from the sensor is in a proper range.
Example two, the tomato nutrient solution is supplied in real time.
The sensor probe of the system is inserted into the soil 15cm around the tomato plant, and the content of nutrient elements in the soil is monitored in real time based on the coverage of the probe.
According to the data, the amounts of various nutrient elements (the numerical values of the nutrient elements in the soil) required by each stage of the tomatoes are input into a software system by referring to the growth rule of the tomatoes.
The software system compares the concentration of the nutrient element ions received from the sensor with an appropriate concentration;
if the concentration of the nutrient ions is within the proper concentration, the software system does not send out an instruction, and if the concentration of certain nutrient ions is lower than the proper concentration, the system sends out an instruction to the reminding equipment and sends out a request for adjusting the ion concentration.
The deficient nutrient ions start to enter the circulating dosing tank, and the stirring device of the circulating dosing tank is opened. The solution is timely conveyed to the root of the crop through a water belt.
And the system reminds the equipment to send out an instruction of stopping adding the nutrient elements until the concentration of the nutrient element ions received by the software system from the sensor is in a proper range.
Example III, real-time supply of scindapsus aureus nutrient solution
1) The sensor probe of the system is inserted into the nutrient soil of 10cm around the scindapsus aureus plant, and the content of nutrient elements in the nutrient soil is monitored in real time based on the probe covering.
2) According to the data, the quantity of various nutrient elements (the numerical values of the nutrient elements in the nutrient soil) required by each stage of the scindapsus aureus is input into a software system by referring to the growth rule of the scindapsus aureus.
The software system compares the concentration of the nutrient element ions received from the sensor with an appropriate concentration;
if the concentration of the nutrient ions is within the proper concentration, the software system does not send out an instruction, and if the concentration of certain nutrient ions is lower than the proper concentration, the system sends out an instruction to the reminding equipment and sends out a request for adjusting the ion concentration.
The deficient nutrient ions start to enter the circulating dosing tank, and the stirring device of the circulating dosing tank is opened. The solution is timely conveyed to the root of the crop through a water belt.
And the system reminds the equipment to send out an instruction of stopping adding the nutrient elements until the concentration of the nutrient element ions received by the software system from the sensor is in a proper range.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. An intelligent crop nutrition real-time supply and regulation system is characterized by comprising an ion concentration sensor, a processor, a memory, a monitoring unit and a regulation device;
the ion concentration sensor is used for measuring the ion concentration of the crop growth nutrient solution or substrate according to a certain time interval;
the ion concentration sensor transmits the measured data to the processor, the processor analyzes and processes the measured data and feeds back the processing result to the monitoring unit, and the monitoring unit controls the regulation and control device to be opened and closed according to the comparison result so as to regulate the ion concentration of the crop growth nutrient solution or the crop growth substrate;
the processor is connected with a memory, and the memory is used for storing data measured by the ion concentration sensor;
the processor is connected with a display which is used for showing the concentration of the crop growth nutrient solution or the matrix ions in the form of a line graph.
2. The intelligent real-time crop nutrition supply and regulation system of claim 1, wherein the processor comprises: a comparison unit for comparing data measured by the ion concentration sensor with normal data;
the judging unit is used for comparing the data measured by the ion concentration sensor with the normal data; if the comparison result is 0, storing the data according to the requirement; if the comparison result is less than 0, the data is stored according to the requirement on one hand, and the information is transmitted to the monitoring unit on the other hand.
3. The intelligent crop nutrient real-time supply and regulation system of claim 1 or 2, wherein the memory comprises: a crop growth stage storage unit, a daily storage unit and a monthly storage unit;
the crop growth stage storage unit is used for storing data obtained by measurement of the ion concentration sensor according to different growth stages;
the day storage unit is used for storing data obtained by measurement of the ion concentration sensor by taking days as a unit;
the month storage unit is used for storing data measured by the ion concentration sensor according to a month unit.
4. The intelligent real-time crop nutrition supply and regulation system of claim 1, wherein the monitoring unit comprises: the voice broadcast ware, when the contrast result that feeds back to the voice broadcast ware is less than the ion concentration of normal crop growth nutrient solution or matrix, the voice broadcast ware carries out the early warning suggestion.
5. The intelligent real-time crop nutrition supply and regulation system of claim 1, wherein the regulation device is further connected with a driving mechanism, and the driving mechanism is used for driving the stirring device to stir the circulating dosing tank so as to make the ion concentration in the mixing device uniform.
6. The system for intelligently providing and regulating the nutrition of crops in real time as claimed in claim 1, wherein the regulating device further comprises a valve for controlling the opening and closing of the nutrient elements and a controller for controlling the opening size of the valve, wherein when the ion concentration of the nutrient solution or the substrate for the growth of the crops is far lower than the normal concentration, the controller controls the valve to be opened to the maximum; when the ion concentration of the crop growth nutrient solution or substrate is not greatly different from the normal concentration, the controller controls the valve to be opened to a slightly closed state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911256549.6A CN110989704A (en) | 2019-12-10 | 2019-12-10 | Intelligent crop nutrition real-time supply and regulation system |
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| US20210227761A1 (en) * | 2020-01-24 | 2021-07-29 | Gordon Arthur Redman | Method and System for Providing Nutrients to a Plant |
| CN116897818A (en) * | 2023-07-18 | 2023-10-20 | 广东省农业科学院设施农业研究所 | Water planting nutrient solution regulating and controlling method and regulating and controlling system |
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