A multi-water-source water and fertilizer balance water-saving irrigation integrated management method and system

Abstract

The application discloses a multi-water-source water-fertilizer balance water-saving irrigation integrated management method and system, and relates to the technical field of irrigation management. The application comprises the following steps: analyzing the concentration of various types of minerals in daily shallow brackish water in previous years to obtain several historical composition stable periods of the shallow brackish water in the previous years and the daily concentration distribution state of various types of minerals; taking the overlapping date period of the historical composition stable periods of the shallow brackish water in the previous years as a reference composition stable period; judging whether the date of the day is in any reference composition stable period and obtaining the concentration of various types of minerals in the shallow brackish water of the day; and obtaining the mixing ratio of the shallow brackish water and fresh water and the adding amount of each fertilizer according to the average irrigation amount per mu required by crops and the target concentration of each type of mineral. The application mixes and matches irrigation water suitable for crop growth, and integrally solves water-saving irrigation and fertilizer proportioning.

Description

Technical Field

[0001] This invention belongs to the field of irrigation management technology, and in particular relates to an integrated management method and system for multi-source water and fertilizer balance water-saving irrigation. Background Technology

[0002] Existing irrigation systems largely rely on single water sources (such as groundwater or river water), making it difficult to integrate multiple sources like rainwater, reclaimed water, and brackish water. This results in poor drought resistance and resource waste. Differences in water quality (such as salinity and pH) among different sources are not dynamically controlled, and direct irrigation can easily lead to soil salinization or reduced fertilizer effectiveness. Traditional methods rely on experience to set fixed irrigation volumes and fertilizer concentrations, failing to adjust in real-time according to crop growth stages, soil moisture, and weather conditions, leading to excessive or insufficient water and fertilizer. Existing irrigation equipment mostly uses timed or manual control, lacking real-time monitoring and feedback of soil moisture, crop water requirements, and environmental parameters, making precise water conservation difficult. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-source water and fertilizer balance integrated management method and system for water-saving irrigation. By dynamically predicting shallow brackish water, the system mixes and matches irrigation water suitable for crop growth, thus solving water-saving irrigation and fertilizer ratio in an integrated manner.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0005] This invention provides a multi-source, water-fertilizer-balanced, water-saving irrigation integrated management method, comprising:

[0006] Obtain test records and extract the daily concentrations of various types of minerals in shallow brackish water over the years;

[0007] The concentrations of various types of minerals in shallow brackish water were analyzed over the years to obtain several historical periods of stable composition of shallow brackish water and the corresponding daily concentration distribution of various types of minerals.

[0008] The overlapping dates of historical component stability periods of shallow brackish water over the years are used as reference component stability periods.

[0009] Determine whether the current date falls within a stable period of any of the aforementioned reference components;

[0010] If not, then daily samples of shallow brackish water will be taken to determine the concentration of various types of minerals in the shallow brackish water on that day.

[0011] If so, shallow brackish water samples are taken and tested starting from the beginning of the stable period of the reference component, and the daily concentration distribution of various types of minerals corresponding to the stable period of the reference component is corrected to obtain the concentration of various types of minerals in the shallow brackish water on that day.

[0012] The mixing ratio of shallow brackish water and fresh water, as well as the amount of each fertilizer, are determined based on the average irrigation amount required per acre for the crop and the target concentration of each type of mineral.

[0013] This invention also discloses a multi-source water and fertilizer balance integrated management method for water-saving irrigation, including,

[0014] The mixing ratio of shallow brackish water and fresh water received on the same day, as well as the amount of each fertilizer added;

[0015] Irrigation units are irrigated using integrated water and fertilizer systems, with the mixing ratio of shallow brackish water and fresh water and the amount of each fertilizer added on the same day being controlled.

[0016] This invention also discloses a multi-source water and fertilizer balance water-saving irrigation integrated management system, comprising,

[0017] The collection unit is used to detect the concentration of various types of minerals in shallow brackish water;

[0018] The mixing and balancing unit is used to acquire detection records and extract the concentration of various types of minerals in shallow brackish water over the years.

[0019] The concentrations of various types of minerals in shallow brackish water were analyzed over the years to obtain several historical periods of stable composition of shallow brackish water and the corresponding daily concentration distribution of various types of minerals.

[0020] The overlapping dates of historical component stability periods of shallow brackish water over the years are used as reference component stability periods.

[0021] Determine whether the current date falls within a stable period of any of the aforementioned reference components;

[0022] If not, then daily samples of shallow brackish water will be taken to determine the concentration of various types of minerals in the shallow brackish water on that day.

[0023] If so, shallow brackish water samples are taken and tested starting from the beginning of the stable period of the reference component, and the daily concentration distribution of various types of minerals corresponding to the stable period of the reference component is corrected to obtain the concentration of various types of minerals in the shallow brackish water on that day.

[0024] The mixing ratio of shallow brackish water and fresh water and the amount of each fertilizer added are determined according to the average irrigation amount required by the crop per acre and the target concentration of each type of mineral.

[0025] The irrigation unit is used to receive the mixing ratio of shallow brackish water and fresh water on the same day, as well as the amount of each fertilizer added.

[0026] Irrigation units are irrigated using integrated water and fertilizer systems, with the mixing ratio of shallow brackish water and fresh water and the amount of each fertilizer added on the same day being controlled.

[0027] This invention analyzes detection records using a mixing and balancing unit to determine the historical stable periods of shallow brackish water composition throughout the year, and then uses this to derive the stable period of usable reference components for the current year. By performing a single test on the starting day of the stable period of reference components, accurate prediction of the daily concentration of shallow brackish water components can be achieved for the entire stable period. This solution dynamically predicts shallow brackish water and mixes and matches it to produce irrigation water suitable for crop growth, providing an integrated solution to water-saving irrigation and fertilizer formulation issues.

[0028] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the functional units and information flow of an embodiment of the multi-source water and fertilizer balance water-saving irrigation integrated management system of the present invention;

[0031] Figure 2 This is a schematic diagram of the steps of a hybrid balancing unit according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram illustrating the generation of the stable period of the reference component as described in this invention;

[0033] Figure 4 This is a schematic diagram of the steps of an embodiment of the irrigation unit described in this invention;

[0034] Figure 5 This is a flowchart illustrating step S2 of the present invention in one embodiment;

[0035] Figure 6 This is a flowchart illustrating step S21 of the present invention in one embodiment;

[0036] Figure 7 This is a flowchart illustrating step S7 of the present invention in one embodiment;

[0037] The attached diagram lists the components represented by each number as follows:

[0038] 1-Collection unit, 2-Mixing and balancing unit, 3-Irrigation unit. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0040] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0041] Collected freshwater such as rainwater, deep groundwater, and river water can be mixed with shallow brackish water to create a suitable mixture for crop growth. Furthermore, because shallow brackish water absorbs fertilizers infiltrated from the ground, it contains some beneficial minerals for crop growth, such as potassium salts and nitrates. Therefore, appropriate use of shallow brackish water can not only conserve freshwater resources but also reduce fertilizer consumption. However, the concentration of shallow brackish water (usually referring to total dissolved solids (TDS) or salinity) may vary dynamically over time, with fluctuations mainly influenced by precipitation and temperature. For example, the seasonal variation of TDS in shallow brackish water in the North China Plain can reach 500–3000 mg / L. To avoid frequent water quality testing, accurate predictions of local shallow brackish water levels can be made by combining geological history monitoring records, as detailed in the following procedures.

[0042] Please see Figures 1 to 4 As shown, this invention provides a multi-source water and fertilizer balance integrated water-saving irrigation management system, which is functionally divided into a data acquisition unit 1, a mixing and balancing unit 2, and an irrigation unit 3. The data acquisition unit 1 typically uses geological survey records obtained from geological exploration institutions. Then, the mixing and balancing unit 2 combines crop demand analysis to determine the mixing ratio of shallow brackish water and fresh water for the day, as well as the amount of each fertilizer to be added. Finally, the irrigation unit 3 performs the mixed irrigation task.

[0043] The acquisition unit 1 in this scheme can be a specific detection device or a data interface for extracting geological detection records. Its purpose is to obtain the concentration of various types of minerals in shallow brackish water. The types of minerals include any number of sodium chloride, calcium chloride, magnesium chloride, potassium chloride, sodium sulfate, magnesium sulfate, sodium carbonate, and sodium bicarbonate. Of course, other types of minerals can also be added according to requirements.

[0044] Please see Figure 2 and 5 As shown, in this scheme, the mixing balance unit 2 can first execute step S1 to obtain detection records and extract the daily concentrations of various types of minerals in shallow brackish water over the years. Next, step S2 can be executed to analyze the daily concentrations of various types of minerals in shallow brackish water over the years, obtaining several historical component stability periods and the corresponding daily concentration distribution of various types of minerals within the shallow brackish water over the years. Specifically, step S21 is executed for each year in the detection records, identifying the dates in that year where the mineral concentration status is consistent as the historical component stability period for that year, and obtaining the daily concentrations of various types of minerals in shallow brackish water within that historical component stability period. Then, step S22 can be executed to obtain the historical component stability periods for each year in the detection records, and the daily concentrations of various types of minerals in shallow brackish water within those historical component stability periods are taken as the daily concentration distribution of various types of minerals within that historical component stability period.

[0045] Please see Figure 5 and 6 As shown, for each year in the monitoring records, in the process of analyzing and calculating its historical stable period, step S211 can be performed first, selecting several representative days from each dry and wet season of that year. This step can be based on regional hydrological and meteorological records. Next, step S212 can be performed, using the cumulative value of the concentration difference of various types of minerals in shallow brackish water between two days as the mineral concentration state differentiation degree between the two days, and calculating the mineral concentration state differentiation degree between each representative day and each non-representative day of that year. Next, step S213 can be performed, assigning each non-representative day and the representative day with the smallest mineral concentration state differentiation degree to the same historical stable period. Generally speaking, the usable historical stable period can be obtained up to this step, and the concentration changes of various minerals in shallow brackish water within each period remain within a small range. Even if there are changes, the trend and magnitude of the changes are small and consistent.

[0046] To obtain more accurate and usable historical component stable periods, new historical component stable periods can be generated through iterative optimization. Specifically, step S214 can be executed to determine whether the dates contained in each historical component stable period are consecutive. If so, it means that each historical component stable period is more accurate and usable, so step S215 can be executed to obtain the historical component stable period for that year.

[0047] If the judgment in step S214 is negative, it indicates that there is room for improvement in the current stable historical component period, and therefore, a new representative date needs to be selected. This process requires performing the following steps for each current stable historical component period: First, step S216 can be executed to determine whether the dates contained within the stable historical component period are consecutive. If yes, then step S217 can be executed to keep the representative date within the stable historical component period unchanged. Otherwise, step S218 can be executed to select the sub-period containing the most dates from among the multiple sub-periods of the stable historical component period as the target sub-period.

[0048] Generally, the median date of a historical component stability period can represent the shallow brackish water state of the target sub-period, and the target sub-period, containing the most days, can also represent the shallow brackish water state of that sub-period. To combine both factors, step S219 can be performed to calculate the average date of all dates included in the historical component stability period. However, there may be cases where the median date is not within the target sub-period. Therefore, a judgment needs to be made: if the average date is within the target sub-period, then the average date is used as the reselected representative date. If the average date is not within the target sub-period, the date within the target sub-period with the shortest time interval from the average date is used as the reselected representative date. This way, the two factors mentioned above can be taken into account to obtain a more accurate representative date.

[0049] After obtaining the reselected representative date, the process can return to steps S212 to S215 to re-divide the historical component stable period based on the reselected representative date, and then proceed to step S216 to determine whether the dates contained in each re-obtained historical component stable period are consecutive, until the historical component stable period for that year is obtained.

[0050] To supplement the explanation of the implementation process of steps S211 to S219 above, source code for some functional modules is provided, with comparative explanations in the comments. To avoid data leakage involving geological confidential information, data that does not affect the implementation of the plan has been anonymized, and the same applies below.

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[0065] The aforementioned functional modules implement a water quality stability period identification algorithm based on representative day selection and continuous time period optimization. During operation, the algorithm first performs water period segmentation, supporting separate processing for dry and wet periods to ensure that seasonal variations do not affect stability analysis. Next, a representative day selection mechanism is implemented, evenly selecting multiple representative days (default 3) for each water period, using mineral concentration differentiation (cumulative absolute difference) to measure date similarity. Then, an initial segmentation is performed, assigning non-representative days to the representative day time period with the lowest differentiation. Continuity checks are then performed to ensure date continuity within each time period. Iterative optimization is then continuously performed, automatically adjusting representative days until all time periods are continuous or the maximum number of iterations is reached. During iteration, intelligent representative day adjustment is performed, selecting the most representative date based on average date theory, prioritizing the selection of new representative days within the longest continuous sub-time period.

[0066] This algorithm is particularly well-suited for processing water quality data exhibiting seasonal variations. Through rigorous continuity checks and iterative optimization, it can accurately identify truly stable water quality periods, providing a reliable basis for subsequent irrigation decisions. Compared to simple statistical methods, this algorithm, based on representative days and continuity, better reflects the physical patterns of actual water quality changes.

[0067] Please see Figure 2 and 4 As shown, after completing the analysis of the historical component stability periods of shallow brackish water over the years, the next step is to execute step S3 to use the overlapping date periods of the historical component stability periods of shallow brackish water over the years as reference component stability periods. For example, in... Figure 4In this study, the overlapping period of historical component stability from 2022 to 2024 was used as the reference component stability period for 2025. This can be seen as the daily distribution of the concentration of various types of minerals in shallow brackish water during the reference component stability period in 2025 being consistent with that from 2022 to 2024.

[0068] Next, step S4 can be executed to determine whether the current date falls within the stable period of any reference component. If not, it means that there is no stable period of any reference component available for reference on that day. Therefore, step S5 can be executed to extract shallow brackish water samples daily and detect the concentration of various types of minerals in the shallow brackish water on that day.

[0069] Please see Figure 2 and 7 As shown, if the result of step S4 is yes, it means that the reference component is in a stable period and can be used for reference. Therefore, step S6 can be executed to extract shallow brackish water samples for testing on the first day of the reference component stable period, and step S7 can be executed to correct the daily concentration distribution of various types of minerals corresponding to the reference component stable period to obtain the concentration of various types of minerals in the shallow brackish water on that day.

[0070] Next, step S71 can be executed. For each historical component stable period corresponding to the current reference component stable period, the number of days between the current day and the representative day within that historical component stable period can be obtained. The ratio of the total number of days in the historical component stable period to the number of days in the interval can be used as the correction coefficient for that historical component stable period. Next, step S72 can be executed. The daily concentrations of various types of minerals in shallow brackish water within each historical component stable period corresponding to the current reference component stable period can be calculated as a weighted average according to the correction coefficient of each historical component stable period to obtain the reference concentration of various types of minerals in shallow brackish water within the current reference component stable period. Next, step S73 can be executed. The difference between the concentration of various types of minerals in shallow brackish water obtained from the shallow brackish water sample taken on the start day of the reference component stable period and the reference concentration of various types of minerals in shallow brackish water on the start day of the reference component stable period can be obtained to obtain the concentration correction difference of various types of minerals. Next, step S74 can be executed to sum the reference concentrations of various types of minerals in the shallow brackish water and the concentration correction differences of various types of minerals during the stable period of the reference component on that day, so as to obtain the estimated concentrations of various types of minerals in the shallow brackish water during the stable period of the reference component on that day. Finally, step S75 can be executed to use the estimated concentrations of various types of minerals in the shallow brackish water on that day as the concentrations of various types of minerals in the shallow brackish water on that day.

[0071] Please continue reading. Figure 1 and2 As shown, after obtaining the concentrations of various types of minerals in the shallow brackish water on that day, step S8 can be performed to obtain the mixing ratio of the shallow brackish water and fresh water on that day and the amount of each fertilizer added, according to the average irrigation amount required by the crop per acre and the target concentration of each type of mineral.

[0072] Please continue reading. Figures 1 to 3 As shown, after the mixing balance unit 2 analyzes and obtains the mixing ratio of shallow brackish water and fresh water and the amount of each fertilizer added on the same day, the irrigation unit 3 can receive the information by executing step S031, and then execute step S032 to control the irrigation unit to carry out integrated water and fertilizer irrigation according to the mixing ratio of shallow brackish water and fresh water and the amount of each fertilizer added on the same day.

[0073] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved.

[0074] It should also be noted that each block in the block diagram and / or flowchart, as well as combinations of blocks in the block diagram and / or flowchart, can be implemented using hardware that performs the corresponding function or action, such as circuits or ASICs (Application Specific Integrated Circuits), or using a combination of hardware and software, such as firmware.

[0075] Although the invention has been described herein in conjunction with various embodiments, those skilled in the art will understand and implement other variations of the disclosed embodiments by reviewing the accompanying drawings, disclosure, and appended claims in carrying out the claimed invention. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0076] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A multi-water-source water-fertilizer balance and water-saving irrigation integrated management method, comprising, obtaining detection records, and extracting the concentrations of various types of minerals in the daily shallow brackish water in previous years; characterized in that analyzing the concentrations of various types of minerals in the daily shallow brackish water in previous years to obtain a plurality of historical composition stable periods of the shallow brackish water in previous years and corresponding daily concentration distribution states of various types of minerals; taking the overlapping date period of the historical composition stable periods of the shallow brackish water in previous years as a reference composition stable period; judging whether the date of the day is in any of the reference composition stable periods; if not, extracting a shallow brackish water sample every day to detect the concentrations of various types of minerals in the daily shallow brackish water; if yes, extracting a shallow brackish water sample on the starting day of the reference composition stable period and, for each historical composition stable period corresponding to the reference composition stable period on the day, calculating a correction coefficient of the historical composition stable period according to the date distribution in each historical composition stable period on the day; calculating a weighted average of the concentrations of various types of minerals in the daily shallow brackish water in each historical composition stable period corresponding to the reference composition stable period in which the day is located according to the correction coefficient of each historical composition stable period to obtain a reference concentration of various types of minerals in the daily shallow brackish water in the reference composition stable period in which the day is located; calculating the difference between the concentrations of various types of minerals in the shallow brackish water obtained by extracting a shallow brackish water sample on the starting day of the reference composition stable period and the reference concentrations of various types of minerals in the shallow brackish water on the starting day of the reference composition stable period to obtain a concentration correction difference of various types of minerals; superimposing the reference concentrations of various types of minerals in the daily shallow brackish water in the reference composition stable period in which the day is located and the concentration correction difference of various types of minerals to obtain an estimated concentration of various types of minerals in the daily shallow brackish water in the reference composition stable period in which the day is located; taking the estimated concentration of various types of minerals in the daily shallow brackish water in the reference composition stable period in which the day is located as the concentration of various types of minerals in the daily shallow brackish water; obtaining the mixing ratio of the daily shallow brackish water and fresh water and the addition amount of each fertilizer according to the average irrigation amount per mu required by crops and the target concentration of each type of mineral.

2. The method according to claim 1, characterized in that, The types of minerals include sodium chloride, calcium chloride, magnesium chloride, potassium chloride, sodium sulfate, magnesium sulfate, sodium carbonate, and / or sodium bicarbonate.

3. The method according to claim 1, characterized in that, The step of analyzing the concentrations of various types of minerals in the daily shallow brackish water in previous years to obtain a plurality of historical composition stable periods of the shallow brackish water in previous years and corresponding daily concentration distribution states of various types of minerals comprises, for each year in the detection records, taking the dates with consistent mineral concentration states in each year as the historical composition stable period of each year, and obtaining the concentrations of various types of minerals in the daily shallow brackish water in the historical composition stable period; The historical composition stable period in each year of the detection record is obtained, and the concentration of each type of mineral in the shallow brackish water on each day in the historical composition stable period is taken as the daily concentration distribution state of each type of mineral in the historical composition stable period.

4. The method according to claim 3, characterized in that, The method comprises the following steps: The following steps are performed for each year in the detection record respectively: A plurality of representative days are selected respectively in each dry period and wet period in each year; The accumulated value of the concentration difference of each type of mineral in the shallow brackish water between two days is taken as the mineral concentration state differentiation degree between the two days, and the mineral concentration state differentiation degree between each representative day and each non-representative day in each year is calculated and obtained; Each non-representative day is divided into the same historical composition stable period as the representative day with the smallest mineral concentration state differentiation degree; It is judged whether the dates contained in each historical composition stable period obtained at present are continuous; If yes, the historical composition stable period in each year is obtained; If no, the representative days are reselected; The historical composition stable period is redivided according to the reselected representative days, and it is judged whether the dates contained in each historical composition stable period obtained after redivision are continuous, until the historical composition stable period in each year is obtained.

5. The method of claim 4, wherein, The step of reselecting the representative days comprises the following steps: The following steps are performed for each historical composition stable period at present respectively: It is judged whether the dates contained in the historical composition stable period are continuous; If yes, the representative days in the historical composition stable period are kept unchanged; If no, a sub-period containing the most dates in the historical composition stable period is selected as a target sub-period; One date in the target sub-period is selected as a representative day.

6. The method of claim 5, wherein, The step of selecting one date in the target sub-period as a representative day comprises the following steps: The average date of all the dates contained in the historical composition stable period is calculated; If the average date is in the target sub-period, the average date is taken as the reselected representative day; If the average date is not in the target sub-period, the date with the shortest time interval from the average date in the target sub-period is taken as the reselected representative day.

7. The method of claim 1, wherein, The step of calculating the correction coefficient of the historical composition stable period according to the date distribution of the current day in each historical composition stable period corresponding to the reference composition stable period comprises the following steps: The interval days between the current day and the representative day in each historical composition stable period corresponding to the reference composition stable period are obtained, and the ratio of the total days of the historical composition stable period to the interval days is taken as the correction coefficient of the historical composition stable period.

8. The method according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: The mixing ratio of the shallow brackish water and fresh water and the addition amount of each fertilizer are received; The water and fertilizer integrated irrigation of the irrigation unit is controlled according to the mixing ratio of the shallow brackish water and fresh water and the addition amount of each fertilizer.

9. A multi-water source water-fertilizer balance water-saving irrigation integrated management system, characterized in that, The method comprises the following steps: A collecting unit is configured to detect the concentration of each type of mineral in the shallow brackish water; A mixing balance unit is configured to obtain a detection record and extract the concentration of each type of mineral in the shallow brackish water on each day in the past years; A mixing balance unit is configured to obtain a detection record and extract the concentration of each type analyzing the concentration of various types of minerals in the shallow brackish water in each day of the years to obtain several historical composition stable periods of the shallow brackish water in the years and the daily concentration distribution state of various types of minerals corresponding to the historical composition stable periods; taking the overlapping date period of the historical composition stable periods of the shallow brackish water in the years as a reference composition stable period; judging whether the date of the day is in any of the reference composition stable periods; if not, extracting the shallow brackish water sample every day to detect the concentration of various types of minerals in the shallow brackish water of the day if yes, extracting the shallow brackish water sample on the starting day of the reference composition stable period to detect, and for each historical composition stable period corresponding to the reference composition stable period in which the day is, calculating the correction coefficient of the historical composition stable period according to the date distribution of the day in each historical composition stable period; calculating the weighted mean of the concentration of various types of minerals in the shallow brackish water every day in each historical composition stable period corresponding to the reference composition stable period in which the day is to obtain the reference concentration of various types of minerals in the shallow brackish water every day in the reference composition stable period in which the day is; calculating the difference between the concentration of various types of minerals in the shallow brackish water obtained by extracting the shallow brackish water sample on the starting day of the reference composition stable period to detect and the reference concentration of various types of minerals in the shallow brackish water on the starting day of the reference composition stable period to obtain the concentration correction difference of various types of minerals; superimposing the reference concentration of various types of minerals in the shallow brackish water every day in the reference composition stable period in which the day is and the concentration correction difference of various types of minerals to obtain the estimated concentration of various types of minerals in the shallow brackish water every day in the reference composition stable period in which the day is; taking the estimated concentration of various types of minerals in the shallow brackish water of the day in the reference composition stable period in which the day is as the concentration of various types of minerals in the shallow brackish water of the day; obtaining the mixing ratio of the shallow brackish water and fresh water and the addition amount of each fertilizer according to the average irrigation amount per mu required by the crops and the target concentration of each type of mineral; an irrigation unit for receiving the mixing ratio of the shallow brackish water and fresh water and the addition amount of each fertilizer; controlling the irrigation unit to carry out water and fertilizer integrated irrigation according to the mixing ratio of the shallow brackish water and fresh water and the addition amount of each fertilizer.

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