Automatic water-saving precision irrigation system for rice field

Abstract

The application discloses a rice field automatic water-saving precision irrigation system and particularly relates to the technical field of water-saving irrigation, which comprises an automatic water-saving irrigation region division module, an automatic water-saving irrigation monitoring equipment setting module, an automatic water-saving irrigation data acquisition module, an automatic water-saving irrigation analysis and decision module, an automatic water-saving irrigation control module and an automatic water-saving irrigation man-machine interaction module; the automatic water-saving irrigation region division module is used for determining the rice field in the jurisdiction region as a target region and dividing the target region into a plurality of monitoring sub-regions, which are sequentially recorded as 1, 2, 3,..., n; the application monitors the rice field in the target region, analyzes the water requirement of each stage according to different growth and development stages, and ensures that the rice obtains the required water during the growth process, thereby avoiding the waste of water. The growth environment of the rice is optimized, and the growth obstacles caused by excessive or insufficient water are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water-saving irrigation, in particular to an automatic water-saving precision irrigation system for rice fields. BACKGROUND

[0002] Rice is one of the important food crops for human beings, and China is one of the places of origin of rice. The growth period of rice is specifically divided into: seedling stage, tillering stage, jointing stage, booting stage, heading stage, flowering stage, filling stage, and maturation stage. The rice field is one of the environments for the growth of rice, and rice has a relatively large demand for water. The current rice irrigation method mainly relies on manual experience and feeling to judge the water demand of the rice field, and then irrigation is carried out through channels or irrigation equipment to provide the required amount of water for the growth and development of rice.

[0003] The traditional rice irrigation method only uses channels or irrigation equipment to flood irrigate the rice field, which not only wastes water resources and has low water utilization, but also is not conducive to the growth and development of rice roots, affecting the normal growth of crops. With the increasing shortage of global water resources, as a large agricultural country, China has increased the cost of agricultural water, increasing the cost of rice planting, and thus efficient water-saving precision irrigation is particularly important for efficient use of water resources.

[0004] Therefore, the automatic water-saving precision irrigation system for rice fields is provided to solve the problems existing in the above irrigation method, and to realize real-time monitoring of the water demand of the rice field and automatic control of the operation of the irrigation equipment according to the preset irrigation strategy, so as to realize precision irrigation, effectively reduce the water consumption during the growth of rice, alleviate the problem of water shortage, improve the utilization efficiency of water resources, and make the water more evenly distributed in the soil, which is conducive to the full absorption and utilization of rice, which not only can reduce the waste of water resources, but also can improve the yield and quality of rice. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present application provide an automatic water-saving precision irrigation system for rice fields to solve the problems raised in the above background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an automatic water-saving precision irrigation system for rice fields, comprising an automatic water-saving irrigation area division module, an automatic water-saving irrigation monitoring equipment setting module, an automatic water-saving irrigation data acquisition module, an automatic water-saving irrigation analysis and decision module, an automatic water-saving irrigation control module, and an automatic water-saving irrigation man-machine interaction module.

[0007] The automatic water-saving irrigation area division module is used to determine the rice field in the jurisdiction area as a target area, and divide the target area into a plurality of monitoring sub-areas, which are sequentially recorded as 1, 2, 3,..., n.

[0008] The automatic water-saving irrigation monitoring equipment setting module is used for setting one image acquisition device on the soil of the paddy field above and below each monitoring sub-area of the paddy field, placing soil humidity sensors, water level sensors and PH testers on the ridges in each monitoring sub-area, and transmitting the monitored data to the automatic water-saving irrigation data acquisition module;

[0009] The automatic water-saving irrigation data acquisition module is used for acquiring data of the sub-areas, obtaining various parameters affecting the irrigation water quantity of the paddy field, and outputting the various parameters to the automatic water-saving irrigation analysis decision module;

[0010] The automatic water-saving irrigation analysis decision module includes an irrigation water quantity analysis unit for different growth and development stages of the rice, a rice leaf state analysis unit and a rice growth environment soil state calculation unit, which are respectively used for calculating temperature parameters and sunshine duration parameters, leaf parameters and soil water retention performance parameters of each growth and development stage of the rice, and outputting corresponding calculation results to the automatic water-saving irrigation control module;

[0011] The specific formula for obtaining the water requirement parameter of the rice in different growth and development stages in each monitoring sub-area in the automatic water-saving irrigation analysis decision module is as follows:

[0012] Wherein j represents four stages of growth and development of the rice, k i j represents the water requirement coefficient of the rice in the i-th sub-area in the j-th stage, N i j represents the water requirement of the i-th sub-area in the j-th stage, T i j represents the sum of the average temperature of the i-th sub-area in the j-th stage, (dt) i j represents the sum of the sunshine duration of the i-th sub-area in the j-th stage, t2 represents the sunset time of each day, t1 represents the sunrise time of each day, E represents the water requirement of the crop in the field during the whole growth period, T k represents the weather temperature at the k-th point, k=1 is the weather temperature at 2 a.m., k=2 is the weather temperature at 8 a.m., k=3 is the weather temperature at 12 noon and k=4 is the weather temperature at 8 p.m.;

[0013] The specific formula for obtaining the leaf parameter of the rice in each monitoring sub-area in the automatic water-saving irrigation analysis decision module is as follows: Wherein e is an empirical constant, Y i j represents the water requirement degree index of the rice leaf in the i-th monitoring sub-area in the j-th stage, y j represents the color value of the rice leaf in the j-th stage, y 0 represents the color value of the rice leaf in the normal growth state, s0 represents the leaf area expansion of rice under sufficient water condition, s j represents the leaf area expansion of rice corresponding to the jth stage;

[0014] The specific formula for obtaining the soil water retention performance parameters of each monitoring sub-area in the automatic water-saving irrigation analysis decision module is as follows: wherein R i j represents the soil water retention performance index of the ith monitoring sub-area in the jth stage, γ represents the soil water retention performance influence factor, (TS) j0 represents the soil temperature required for normal growth of rice in the jth stage, (TS) j represents the actual soil temperature for growth of rice in the jth stage, (PH) j0 represents the soil pH required for normal growth of rice in the jth stage, (PH) j represents the actual soil pH for growth of rice in the jth stage, C j0 represents the soil humidity required for normal growth of rice in the jth stage, C j represents the actual soil humidity for growth of rice in the jth stage;

[0015] The automatic water-saving irrigation control module is used for comprehensively analyzing the analysis and decision results obtained by the automatic water-saving irrigation analysis decision module, automatically controlling the on-off of the irrigation equipment according to the comprehensive analysis results, adjusting the irrigation amount, including the design of the control circuit of the irrigation equipment and the alarm circuit, and sending an alarm signal when necessary, and transmitting the warning signal to the automatic water-saving irrigation man-machine interaction module.

[0016] The automatic water-saving irrigation man-machine interaction module is used for the rice field staff to view the irrigation state of each stage of rice growth according to the comprehensive analysis results and alarm information transmitted by the control module, remotely manually control and adjust the irrigation parameters, and notify the field staff to control the irrigation equipment on site when necessary.

[0017] Preferably, the various parameters affecting the irrigation water amount of the rice field in the automatic water-saving irrigation data acquisition module include target area information, contact information of the rice field staff, rice growth and development stage parameters, rice image parameters, and soil state parameters. The rice growth and development stage parameters are obtained by the temperature parameter and the sunshine duration parameter through the image information acquisition function; the rice image parameters are specifically the leaf color and leaf area expansion in the monitoring sub-area; and the soil state parameters are the air temperature, soil humidity and soil pH of the rice field in the monitoring sub-area obtained by the temperature sensor, humidity sensor and PH tester.

[0018] Preferably, the automatic water-saving irrigation analysis decision module is for each growth and development stage of rice, and the growth and development stages are: transplanting and returning green stage, tillering stage, jointing and booting stage, and heading and maturing stage, and the growth and development stages are sequentially numbered as 1, 2, 3 and 4.

[0019] Preferably, the automatic water-saving irrigation analysis decision module is for each growth and development stage of rice, and the growth and development stages are: transplanting and returning green stage, tillering stage, jointing and booting stage, and heading and maturing stage, and the growth and development stages are sequentially numbered as 1, 2, 3 and 4. Wherein E i j represents the irrigation water required by the rice in the i th monitoring sub-area in the j th stage, k c represents the growth coefficient of the rice, β 2 represents the leaf water requirement influence factor, β 1 represents the soil irrigation coefficient, N i j represents the water requirement of the i th sub-area in the j th stage, Y i j represents the leaf water requirement degree index of the rice in the i th monitoring sub-area in the j th stage, R i j represents the soil water retention performance index of the i th monitoring sub-area in the j th stage, (dn) i j represents the soil water infiltration amount of the i th monitoring sub-area in the j th growth and development stage, B i j represents the soil underground drainage amount of the i th monitoring sub-area in the j th growth and development stage.

[0020] Preferably, the automatic water-saving irrigation control module is for the comprehensive analysis result model: Wherein E j represents the comprehensive irrigation water required by the rice in the j th stage of the target area, E i j represents the irrigation water required by the rice in the j th stage of the i th monitoring sub-area.

[0021] Technical effects and advantages of the present application:

[0022] 1. The present application monitors the rice field in the target area, analyzes the water requirement of each stage according to different growth and development stages, ensures that the rice obtains the required water in the growth process, avoids the waste of water, optimizes the growth environment of the rice, reduces the growth obstacles caused by excessive or insufficient water, further helps the rice to form healthy plants and ear parts, improves the seed setting rate and thousand-grain weight, and finally increases the yield. At the same time, due to the balanced supply of water and nutrients, the quality of the rice is also improved;

[0023] 2、The present application monitors the rice field in the target area, analyzes the current water demand of the rice in the monitoring area according to the state of the rice leaves, adjusts the irrigation water volume, avoids waste caused by excessive water, maintains appropriate water supply, improves the photosynthesis efficiency of the rice leaves, prevents excessive transpiration of the leaves, and further promotes the growth and development of the rice;

[0024] 3、The present application monitors the rice field in the target area, analyzes the irrigation water volume of the soil in the growth environment of the rice in the monitoring area according to the state of the rice field soil, and performs corresponding control to maintain the water balance in the soil, avoid over-wet or over-dry soil, achieve precise irrigation of the rice field, promote the release and effective utilization of nutrients in the soil, provide a good soil environment for the growth of the rice, and achieve the goals of rational utilization of water resources and environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall process of the present application. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0027] Please refer to Figure 1 The present application provides an automatic water-saving precise irrigation system for rice fields, which comprises an automatic water-saving irrigation area division module, an automatic water-saving irrigation monitoring equipment setting module, an automatic water-saving irrigation data acquisition module, an automatic water-saving irrigation analysis and decision-making module, an automatic water-saving irrigation control module, and an automatic water-saving irrigation human-computer interaction module.

[0028] The automatic water-saving irrigation area division module is connected with the automatic water-saving irrigation monitoring equipment setting module, the automatic water-saving irrigation data acquisition module is connected with the automatic water-saving irrigation analysis and decision-making module and the automatic water-saving irrigation monitoring equipment setting module respectively, the automatic water-saving irrigation control module is connected with the automatic water-saving irrigation decision-making module and the automatic water-saving irrigation human-computer interaction module respectively, and the terminal of the automatic water-saving irrigation human-computer interaction module is connected with the automatic water-saving irrigation analysis and decision-making module.

[0029] The automatic water-saving irrigation area division module is used to determine the rice field in the jurisdiction area as a target area, and divide the target area into a plurality of monitoring sub-areas, which are sequentially recorded as 1, 2, 3,..., n;

[0030] The embodiment needs to be specifically explained that the target monitoring area of the embodiment is divided into each monitoring sub-area according to equal area, and the rice varieties in each monitoring sub-area are the same, and the planting environment is the same.

[0031] The automatic water-saving irrigation monitoring equipment setting module is used for setting one image acquisition device on the rice field soil above and below each monitoring sub-area of the rice field, placing soil humidity sensors, water level sensors and PH testers on the dike in each monitoring sub-area, and transmitting the monitored data to the automatic water-saving irrigation data acquisition module.

[0032] The automatic water-saving irrigation data acquisition module is used for acquiring data of the sub-area, obtaining each parameter affecting the irrigation water quantity of the rice field, and outputting each parameter to the automatic water-saving irrigation analysis decision module.

[0033] The embodiment needs to be specifically explained that each parameter affecting the irrigation water quantity of the rice field in the automatic water-saving irrigation data acquisition module includes target area information, a contact method of a rice field worker, rice growth and development stage parameters, rice image parameters, and soil state parameters. The temperature parameter and the sunshine duration parameter are obtained through the image information acquisition function; the rice image parameters are specifically the leaf color and the leaf area in the monitoring sub-area; and the soil state parameters are the air temperature, the soil humidity and the soil pH value of the rice field in the monitoring sub-area obtained through the temperature sensor, the humidity sensor and the PH tester.

[0034] The automatic water-saving irrigation analysis decision module includes a rice different growth and development stage irrigation water quantity analysis unit, a rice leaf state analysis unit and a rice growth environment soil state calculation unit, which are respectively used for calculating the temperature parameter, the sunshine duration parameter, the leaf parameter and the soil water retention performance parameter of each growth and development stage of the rice, and outputting the corresponding calculation to the automatic water-saving irrigation control module, and the decision analysis includes the following steps.

[0035] The embodiment needs to be specifically explained that the rice growth and development stages are respectively: the transplanting and green returning period, the tillering period, the jointing and earing period, and the heading and maturing period, and the growth and development stages are sequentially numbered as 1, 2, 3 and 4.

[0036] Step one: the growth and development stage of the rice is an important factor affecting the water requirement, and the water requirement is different in different stages. The specific formula for obtaining the water requirement parameter of each monitoring sub-area of the rice different growth and development stage in the automatic water-saving irrigation analysis decision module is as follows:

[0037] Wherein j represents the four stages of the rice growth and development, k i jN i j T i j (dt) i j t2 k k = 1 for 2 a.m., k = 2 for 8 a.m., k = 3 for 12 noon and k = 4 for 8 p.m. weather temperature;

[0038] Step two: The state of rice leaves is one of the important bases for judging its water demand. By observing the color and stretching of rice leaves, the grower can accurately judge the water demand of rice and thus carry out reasonable irrigation; healthy rice leaves should present a green and full state and do not need additional irrigation; however, if the leaves appear yellow, dry or curled, it may be a manifestation of water shortage, at which time irrigation needs to be carried out in time; secondly, the stretching of leaves can also reflect the water demand of rice; under sufficient water supply, rice leaves will fully expand and present a straight posture; if the water is insufficient, the leaves may shrink or droop due to water shortage, at which time the irrigation amount needs to be increased. The specific formula for obtaining the rice leaf parameter in each monitoring sub-region in the automatic water-saving irrigation analysis and decision module is: wherein e is an empirical constant, Y i j y j y 0 s 0 s j y

[0039] Step three: The water retention performance of the soil of rice growth environment is poor, which needs more frequent irrigation; the soil water retention capacity is good, which can reduce the irrigation frequency. The specific formula for obtaining the soil water retention performance parameter in each monitoring sub-region in the automatic water-saving irrigation analysis and decision module is:

[0040] wherein R i j γ j0denotes the soil temperature required for normal growth of rice in the jth stage, (TS) j denotes the actual soil temperature for growth of rice in the jth stage, (PH) j0 denotes the soil pH required for normal growth of rice in the jth stage, (PH) j denotes the actual soil pH for growth of rice in the jth stage, C j0 denotes the soil moisture size required for normal growth of rice in the jth stage, C j denotes the actual soil moisture size for growth of rice in the jth stage, the soil of the target water-saving irrigation area where rice is in normal growth state has relatively large soil moisture due to the presence of water, and the soil moisture decreases when the soil is water-deficient;

[0041] Step four: the water-saving precision irrigation of the rice field is comprehensively affected by the growth and development stage of rice, the soil water retention performance, and the leaf state parameters, and the calculation formula of the irrigation water required by rice in each stage of each monitoring sub-area in the automatic water-saving irrigation analysis and decision module is as follows: wherein E i j denotes the irrigation water required by rice in the jth stage of the ith monitoring sub-area, k c denotes the growth coefficient of rice, β2 denotes the leaf water demand influence factor, and β1 denotes the soil irrigation coefficient, N i j denotes the water demand in the jth stage of the ith sub-area, Y i j denotes the leaf water demand degree index of rice in the jth stage in the ith monitoring sub-area, R i j denotes the soil water retention performance index of the jth stage of the ith monitoring sub-area, (dn) i j denotes the soil water leakage in the jth growth and development stage in the ith monitoring sub-area, B i j denotes the soil underground drainage in the jth growth and development stage of the ith monitoring sub-area;

[0042] The automatic water-saving irrigation control module is used for comprehensive analysis of the analysis and decision results obtained by the automatic water-saving irrigation analysis and decision module, automatic control of the on-off of the irrigation equipment according to the comprehensive analysis results, adjustment of the irrigation amount, design of a control circuit of the irrigation equipment and an alarm circuit, and transmission of an alarm signal to the automatic water-saving irrigation man-machine interaction module when necessary, and the comprehensive analysis result model is: wherein E j denotes the comprehensive irrigation water required by rice in the jth stage of the target area, E i jrepresents the irrigation water required by the rice in the i th monitoring sub-region in the j th stage;

[0043] The automatic water-saving irrigation man-machine interaction module is used for the staff of the rice field to view the irrigation state of each stage of the rice field growth according to the comprehensive analysis result and alarm information transmitted by the control module, to remotely manually control and adjust the irrigation parameters, and to notify the field staff to control the irrigation equipment on site when necessary.

[0044] Secondly, only the structures related to the disclosed embodiments are involved in the drawings of the disclosed embodiments, other structures can refer to the general design, and the same embodiments and different embodiments of the present application can be combined with each other under the condition of no conflict;

[0045] Finally, the above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automated precision water-saving irrigation system for rice fields, characterized in that: The automatic water-saving irrigation system comprises an automatic water-saving irrigation area division module, an automatic water-saving irrigation monitoring device setting module, an automatic water-saving irrigation data acquisition module, an automatic water-saving irrigation analysis and decision module, an automatic water-saving irrigation control module, and an automatic water-saving irrigation man-machine interaction module. The automatic water-saving irrigation area division module is used for determining a paddy field in a jurisdictional area as a target area, and dividing the target area into a plurality of monitoring sub-areas, which are sequentially recorded as 1, 2, 3,..., n. The automatic water-saving irrigation monitoring device setting module is used for setting one image acquisition device on the paddy field soil above and below each monitoring sub-area of the paddy field, respectively, placing soil humidity sensors, water level sensors and PH testers on the ridges in each monitoring sub-area, and transmitting the monitored data to the automatic water-saving irrigation data acquisition module. The automatic water-saving irrigation data acquisition module is used for acquiring data of the sub-areas, obtaining various parameters affecting the irrigation water quantity of the paddy field, and outputting the various parameters to the automatic water-saving irrigation analysis and decision module. The automatic water-saving irrigation analysis and decision module comprises a water rice different growth stage irrigation water quantity analysis unit, a water rice leaf state analysis unit and a water rice growth environment soil state calculation unit, which are respectively used for calculating temperature parameters and sunshine duration parameters, leaf parameters and soil water retention performance parameters of each growth stage of the water rice, and outputting the corresponding calculation results to the automatic water-saving irrigation control module. The specific formulas for obtaining water requirement parameters for rice at different growth and development stages in each monitoring sub-region of the automated water-saving irrigation analysis and decision-making module are as follows: , , Where j represents the four stages of rice growth and development, k i j N represents the water requirement modulus of rice in the i-th sub-region at the j-th stage. i j T represents the water demand of the i-th sub-region at the j-th stage. i j Let dt represent the sum of the average temperatures of the i-th sub-region during the j-th stage. i j Let t1 represent the total sunshine duration of the i-th sub-region in the j-th stage, t2 represent the daily sunset time, t1 represent the daily sunrise time, E represent the field water requirement of the crop throughout its entire growth period, and T represent the total sunshine duration of the crop. k Let k represent the weather temperature at point k, where k=1 represents the weather temperature at 2 AM, k=2 represents the weather temperature at 8 AM, k=3 represents the weather temperature at 12 PM, and k=4 represents the weather temperature at 8 PM. The specific formula for acquiring rice leaf parameters by each monitoring sub-area in the automatic water-saving irrigation analysis decision module is as follows: Wherein e is an empirical constant, Y i j represents the water requirement degree index of the jth stage of rice leaf in the ith monitoring sub-area, y j represents the color value of the jth stage of rice leaf, y 0 represents the color value of the leaf of the corresponding rice under the normal growth state, s 0 represents the leaf area of the rice under the condition of sufficient water, s j represents the leaf area of the jth stage of rice leaf; The specific formula for acquiring the soil water retention performance parameter of each monitoring sub-region in the automatic water-saving irrigation analysis decision module is: Wherein R i j represents the soil water retention performance index of the i-th monitoring sub-region in the j-th stage, represents the soil water retention performance influence factor, (TS) j0 represents the soil temperature required for the normal growth of rice in the j-th stage, (TS) j represents the actual soil temperature for the growth of rice in the j-th stage, (PH) j0 represents the soil pH required for the normal growth of rice in the j-th stage, (PH) j represents the actual soil pH for the growth of rice in the j-th stage, C j0 represents the soil moisture required for the normal growth of rice in the j-th stage, C j represents the actual soil moisture for the growth of rice in the j-th stage; The automatic water-saving irrigation control module is used for comprehensively analyzing the analysis and decision results obtained by the automatic water-saving irrigation analysis and decision module, automatically controlling the on-off of the irrigation equipment according to the comprehensive analysis results, adjusting the irrigation quantity, including the design of a control circuit of the irrigation equipment and an alarm circuit, and sending an alarm signal to the automatic water-saving irrigation man-machine interaction module. The automatic water-saving irrigation man-machine interaction module is used for enabling a water rice field staff to view the irrigation state of each stage of the water rice field growth according to the comprehensive analysis results and alarm information transmitted by the control module, remotely manually control and adjust the irrigation parameters, and notify a field staff to control the irrigation equipment on site.

2. The automated precision water-saving rice field irrigation system according to claim 1, characterized in that: The various parameters affecting the irrigation water quantity of the paddy field in the automatic water-saving irrigation data acquisition module include target area information, a water rice field staff contact method, water rice each growth stage parameters, water rice image parameters and soil state parameters, wherein the water rice each growth stage parameters are obtained by an image information acquisition function to obtain temperature parameters and sunshine duration parameters; the water rice image parameters specifically refer to leaf color and leaf expansion area in the monitoring sub-area; The soil state parameters are obtained by a temperature sensor, a humidity sensor and a PH tester to obtain air temperature, soil humidity and soil pH of the paddy field in the monitoring sub-area.

3. The automated precision water-saving rice field irrigation system, as claimed in claim 1, wherein: The water rice each growth stage in the automatic water-saving irrigation analysis and decision module is: transplanting and returning green period, tillering period, jointing and booting period, and heading and maturing period, and the growth stages are sequentially numbered as 1, 2, 3 and 4.

4. The automated precision water-saving rice field irrigation system, as claimed in claim 1, wherein: The formula for calculating the required irrigation water of each monitoring sub-region in the automatic water-saving irrigation analysis decision module is as follows: Wherein E i j represents the required irrigation water of the i th monitoring sub-region in the j th stage, k c represents the growth coefficient of rice, β 2 represents the leaf water demand influence factor, β 1 represents the soil irrigation coefficient, N i j represents the water requirement of the i th sub-region in the j th stage, Y i j represents the leaf water demand index of the j th stage in the i th monitoring sub-region, R i j represents the soil water retention performance index of the j th stage in the i th monitoring sub-region, (dn) i j represents the soil water infiltration amount of the j th growth and development stage in the i th monitoring sub-region, B i j represents the soil underground drainage amount of the j th growth and development stage in the i th monitoring sub-region.

5. The automated precision water-saving rice field irrigation system, as claimed in claim 1, wherein: The automatic water-saving irrigation control module has a comprehensive analysis result model: wherein E j represents the comprehensive irrigation water demand of the jth stage of rice in the target area, E i j represents the irrigation water demand of the jth stage of rice in the ith monitoring sub-area.

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