Agricultural crop water-saving potential evaluation method and system

Abstract

The invention provides an agricultural crop water-saving potential evaluation method. The method comprises the following steps: carrying out basic data collection on an evaluation area; carrying out crop production water footprint calculation based on the basic data; determining a crop field production water footprint reference based on the crop production water footprint; and performing agricultural crop water-saving potential evaluation based on the crop production water footprint and the crop field production water footprint benchmark. According to the method, meteorological data, crop production data, soil data and irrigation data are comprehensively collected, production water footprint calculation is carried out on an evaluation area, comprehensive evaluation of agricultural water-saving potential is achieved, meanwhile, a production water footprint criterion suitable for the area is constructed through the crop cumulative yield, and the accuracy and persuasion of an evaluation result are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural water-saving analysis, and in particular to a method and system for evaluating the water-saving potential of agricultural crops. Background Art

[0002] my country is a country with an extremely short supply of water resources. The contradiction between water shortage and waste has become more prominent with the rapid development of social economy. Drought and water shortage is also a global problem. The cultivated land area in arid and semi-arid areas accounts for about 43% of the total cultivated land area. If no immediate actions and measures are taken to protect and rationally utilize water resources, the water crisis will seriously restrict the global economic and social development. The fundamental way to solve this crisis is to vigorously develop efficient agricultural water conservation and tap the potential of agricultural water conservation.

[0003] Agricultural water-saving potential evaluation is the process of evaluating the amount of water resources that may be saved after the implementation of water-saving measures in agricultural irrigation systems. This process aims to identify the problem of water waste in existing irrigation systems, and improve the efficiency of water resource utilization and reduce unnecessary waste through technical improvements and management optimization. Agricultural water-saving potential evaluation usually involves comprehensive consideration of irrigation technology, irrigation system, irrigation engineering facilities, agricultural planting structure and other aspects. By evaluating agricultural water-saving potential, we can effectively improve the utilization rate of water resources and improve the agricultural ecological environment.

[0004] However, existing agricultural water-saving potential evaluation methods often find it difficult to consider the impact of multiple factors for comprehensive evaluation, and it is also difficult to construct a reasonable benchmark, resulting in unconvincing evaluation results. Summary of the invention

[0005] In view of this, the present invention proposes a method and system for evaluating the water-saving potential of agricultural crops to solve the problems existing in the above-mentioned prior art.

[0006] On the one hand, to achieve the above-mentioned purpose, the present invention proposes a method for evaluating the water-saving potential of agricultural crops, comprising:

[0007] Collect basic information on the assessment area;

[0008] Calculate the water footprint of crop production based on the basic data;

[0009] determining a crop field production water footprint benchmark based on the crop production water footprint;

[0010] The water-saving potential of agricultural crops is evaluated based on the crop production water footprint and the crop field production water footprint benchmark.

[0011] Furthermore, the basic data include meteorological data, crop production data, soil data, and irrigation data; the meteorological data include precipitation on a daily or monthly scale, carbon dioxide concentration, maximum temperature, minimum temperature, relative humidity, wind speed, and sunshine hours; the crop production data include crop varieties, crop planting distribution data, sowing area, planting density, leaf area index, sowing date, growth period, harvest date, harvest index, and yield per unit area; the soil data include soil texture, plow layer thickness, soil capacity, and soil water content; the irrigation data include actual irrigation area, irrigation quota, irrigation system, and irrigation water utilization coefficient.

[0012] Furthermore, the process of calculating the water footprint of crop production based on the basic data includes:

[0013] Calculate the ten-day precipitation based on the daily or monthly precipitation, and calculate the ten-day effective precipitation based on the ten-day precipitation; accumulate the effective precipitation of each ten-day to obtain the effective precipitation during the crop growth period;

[0014] Calculate the crop water requirement based on the crop coefficient and the crop evaporation and transpiration; calculate the portion of the crop water consumption that comes from effective precipitation based on the effective precipitation during the crop growth period and the crop water requirement;

[0015] The green water footprint of crops is calculated based on the portion of crop water consumption that comes from effective precipitation and the crop yield per unit area;

[0016] Calculate the portion of the crop water consumption that comes from irrigation water based on the crop water requirement and the effective precipitation during the crop growth period;

[0017] The blue water footprint of crops was calculated based on the portion of crop water consumption that comes from irrigation water and the crop yield per unit area.

[0018] Furthermore, the process of determining a crop field production water footprint benchmark based on the crop production water footprint includes:

[0019] Collect cumulative sample statistics of production in the assessment area. When the number of samples is greater than or equal to 30, arrange all samples in ascending order according to the production water footprint value. When the cumulative distribution curve of the corresponding production of a certain crop reaches more than 20% of the total production of all samples, the production water footprint value of the crop sample is used as the production water footprint benchmark of the crop field;

[0020] When the number of samples is less than 30, the crop production water footprint under different production management modes is calculated, and the minimum value of the crop production water footprint is used as the benchmark for the crop field production water footprint.

[0021] Furthermore, the process of evaluating the water-saving potential of agricultural crops based on the crop production water footprint and the crop field production water footprint benchmark includes:

[0022] Based on the crop green water footprint, crop blue water footprint and the crop field production water footprint benchmark, combined with the crop yield per unit area, actual irrigation area, and irrigation water utilization coefficient, the engineering water saving potential of the assessment area is calculated;

[0023] Based on the crop green water footprint and the crop field production water footprint benchmark, combined with the crop yield per unit area and the actual irrigation area, the green water real water saving potential of the assessment area is calculated;

[0024] Based on the crop blue water footprint and the crop field production water footprint benchmark, combined with the crop yield per unit area and the actual irrigation area, the blue water real water saving potential of the assessment area is calculated;

[0025] The real water-saving potential of the assessment area is evaluated based on the real water-saving potential of the green water and the real water-saving potential of the blue water.

[0026] On the other hand, to achieve the above-mentioned purpose, the present invention proposes an agricultural crop water-saving potential evaluation system, comprising an information collection module, a production water footprint calculation module, a benchmark determination module and a water-saving potential evaluation module connected in sequence;

[0027] The information collection module is used to collect basic information about the assessment area;

[0028] The production water footprint calculation module is used to calculate the crop production water footprint based on the basic data;

[0029] The benchmark determination module is used to determine the crop field production water footprint benchmark based on the crop production water footprint;

[0030] The water-saving potential assessment module is used to evaluate the water-saving potential of agricultural crops based on the crop production water footprint and the crop field production water footprint benchmark.

[0031] Furthermore, the information collection module includes a meteorological collection module, a production collection module, a soil collection module and an irrigation collection module. The meteorological collection module is used to collect meteorological data of the assessment area, including precipitation on a daily or monthly scale, carbon dioxide concentration, maximum temperature, minimum temperature, relative humidity, wind speed and sunshine hours; the production collection module is used to collect crop production data, including crop varieties, crop planting distribution data, sowing area, planting density, leaf area index, sowing date, growth period, harvest date, harvest index and yield per unit area; the soil collection module is used to collect soil data, including soil texture, plow layer thickness, soil capacity and soil water content; the irrigation collection module is used to collect irrigation data, including actual irrigation area, irrigation quota, irrigation system, and irrigation water utilization coefficient.

[0032] Further, the production water footprint calculation module includes a green water footprint calculation module and a blue water footprint calculation module;

[0033] The green water footprint calculation module calculates the ten-day precipitation according to the daily or monthly precipitation, and calculates the ten-day effective precipitation according to the ten-day precipitation; accumulates the effective precipitation of each ten-day to obtain the effective precipitation during the crop growth period; calculates the crop water requirement according to the crop coefficient and the crop evaporation and transpiration; calculates the part of the crop water consumption that comes from the effective precipitation according to the effective precipitation during the crop growth period and the crop water requirement; calculates the crop green water footprint according to the part of the crop water consumption that comes from the effective precipitation and the crop yield per unit area;

[0034] The blue water footprint calculation module calculates the portion of the crop water consumption that comes from irrigation water according to the crop water demand and the effective precipitation during the crop growth period, and calculates the crop blue water footprint according to the portion of the crop water consumption that comes from irrigation water and the crop yield per unit area.

[0035] Further, the benchmark determination module includes a sample collection module and a benchmark calculation module;

[0036] The sample collection module is used to collect cumulative sample statistics of the production in the assessment area;

[0037] When the number of samples is greater than or equal to 30, the benchmark calculation module arranges all samples in ascending order according to the production water footprint value. When the cumulative distribution curve of the corresponding yield of a certain crop reaches more than 20% of the total yield of all samples, the production water footprint value of the crop sample is used as the crop field production water footprint benchmark;

[0038] When the number of samples is less than 30, the benchmark calculation module calculates the crop production water footprint under different production management modes, and takes the minimum value of the crop production water footprint as the crop field production water footprint benchmark.

[0039] Further, the water-saving potential assessment module includes an engineering water-saving potential assessment module and a real water-saving potential assessment module;

[0040] The engineering water-saving potential assessment module calculates the engineering water-saving potential of the assessment area based on the crop green water footprint, the crop blue water footprint and the crop field production water footprint benchmark, combined with the crop yield per unit area, the actual irrigation area, and the irrigation water utilization coefficient;

[0041] The real water-saving potential assessment module calculates the real water-saving potential of green water in the assessment area based on the crop green water footprint and the crop field production water footprint benchmark, combined with the crop unit area yield and the actual irrigation area, and calculates the real water-saving potential of blue water in the assessment area based on the crop blue water footprint and the crop field production water footprint benchmark, combined with the crop unit area yield and the actual irrigation area;

[0042] Finally, the real water-saving potential of the assessment area is evaluated based on the real water-saving potential of the green water and the real water-saving potential of the blue water.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The present invention calculates the production water footprint of the evaluation area by comprehensively collecting meteorological data, crop production data, soil data and irrigation data, thereby achieving a comprehensive assessment of the agricultural water-saving potential. At the same time, the production water footprint criteria applicable to the region are constructed through the cumulative crop output, further improving the accuracy and persuasiveness of the evaluation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0046] Figure 1 This is a flow chart of a method for evaluating water-saving potential of agricultural crops in an embodiment of the present invention;

[0047] Figure 2 This is an architecture diagram of an agricultural crop water-saving potential evaluation system in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] This embodiment proposes a method for evaluating the water-saving potential of agricultural crops. Figure 1 As shown, the following steps are included:

[0050] Collect basic information on the assessment area;

[0051] Calculate the water footprint of crop production based on the basic data;

[0052] determining a crop field production water footprint benchmark based on the crop production water footprint;

[0053] The water-saving potential of agricultural crops is evaluated based on the crop production water footprint and the crop field production water footprint benchmark.

[0054] As a preferred embodiment, the crop production water footprint indicates the amount of water resources from different sources consumed in the crop production process, including the crop production green water footprint and the crop production blue water footprint. The crop production green water footprint indicates the amount of precipitation consumed in the crop production process, and the crop production blue water footprint indicates the amount of surface water and groundwater consumed in the crop production process.

[0055] As a preferred embodiment, the basic data specifically include meteorological data, crop production data, soil data, and irrigation data; wherein the meteorological data adopts the meteorological data of the meteorological observation station closest to the field, the most representative or in the farmland production area, including: precipitation on a daily or monthly scale, CO2 concentration, maximum temperature, minimum temperature, relative humidity, wind speed, sunshine hours, etc.; the crop production data adopts the local data of the evaluation area, including crop varieties, crop planting distribution data, sowing area, planting density, leaf area index, sowing date, growth period, harvest date, harvest index and crop yield per unit area, etc. The yield data should obtain the required evaluation scale data from the local statistical department. When using the yield data, the measurement method of the obtained yield data (such as the measured part of the crop, dry weight or fresh weight) should be understood; the soil data includes soil texture, plow layer thickness, soil capacity and soil water content; the irrigation data includes actual irrigation area, irrigation quota, irrigation system, and irrigation water utilization coefficient.

[0056] As a preferred embodiment, in the process of calculating the crop production water footprint based on basic data, the crop green water footprint and the crop blue water footprint are calculated separately:

[0057] First, the ten-day precipitation is calculated based on the daily or monthly precipitation, and the ten-day effective precipitation is calculated based on the ten-day precipitation. The specific calculation method is as follows:

[0058]

[0059] Among them, P dec is the ten-day precipitation, P e(dec) It is the effective precipitation in ten days.

[0060] The effective precipitation in each decade is accumulated to obtain the effective precipitation during the crop growth period;

[0061] Calculate crop water requirements based on crop coefficient and crop evapotranspiration:

[0062] ET c =k c ×ET0

[0063] Among them, E.T. c is the crop water requirement, k c is the crop coefficient, ET0 is the reference crop evapotranspiration;

[0064] The part of crop water consumption that comes from effective precipitation is calculated based on the effective precipitation during the crop growth period and the crop water requirement:

[0065] ET g =min(ET c , P e )

[0066] Among them, E.T. g is the portion of crop water consumption that comes from effective precipitation, P e It is the effective precipitation during the crop growing period.

[0067] The green water footprint of crops is calculated based on the portion of crop water consumption that comes from effective precipitation and the crop yield per unit area:

[0068]

[0069] Among them, WF g is the green water footprint of crop production, Y is the crop yield per unit area, and 10 represents the unit conversion factor, which converts the unit from water depth to water volume per unit area.

[0070] After calculating the green water footprint of crops, the portion of crop water consumption that comes from irrigation water is calculated based on crop water demand and effective precipitation during the crop growth period:

[0071] ET b =max(0,ET c -P e )

[0072] Among them, E.T. b ET is the portion of crop water consumption that comes from irrigation water. c is the crop water requirement, P e It is the effective precipitation during the crop growing period.

[0073] The blue water footprint of crops is calculated based on the portion of crop water consumption that comes from irrigation water and the crop yield per unit area:

[0074]

[0075] Among them, WF bis the blue water footprint of crops, Y is the crop yield per unit area, and 10 represents the unit conversion factor, which converts the unit from water depth to water volume per unit area.

[0076] As a preferred embodiment, after calculating and obtaining the crop production water footprint, determining the crop field production water footprint benchmark according to the crop production water footprint specifically includes:

[0077] Collect cumulative sample statistics of production in the assessment area. When the number of samples is greater than or equal to 30, arrange all samples in ascending order according to the production water footprint value. When the cumulative distribution curve of the corresponding production of a certain crop reaches more than 20% of the total production of all samples, the production water footprint value of the crop sample is used as the benchmark of the crop field production water footprint;

[0078] When the number of samples is less than 30, the crop production water footprint under different production management modes is calculated, and the minimum value of the crop production water footprint is used as the benchmark for the crop field production water footprint.

[0079] As a preferred embodiment, after obtaining the crop field production water footprint benchmark, the water saving potential of agricultural crops is evaluated according to the crop production water footprint and the crop field production water footprint benchmark, specifically including:

[0080] Based on the green water footprint of crops, blue water footprint of crops and water footprint of crop field production, combined with the crop yield per unit area, actual irrigation area and irrigation water utilization coefficient, the engineering water saving potential of the assessment area is calculated:

[0081]

[0082] Among them, WSP e For the water saving potential of the project, WF b Blue water footprint for crops, WF g is the crop green water footprint, Y is the crop yield per unit area, S is the actual irrigation area, η is the irrigation water utilization coefficient, and WFB is the crop field production water footprint benchmark;

[0083] Based on the green water footprint of crops and the water footprint of crop field production, combined with the crop yield per unit area and the actual irrigation area, the real green water saving potential of the assessment area is calculated:

[0084]

[0085] Among them, WSP a-b Real water saving potential for green water;

[0086] Based on the blue water footprint of crops and the water footprint benchmark of crop field production, combined with the crop yield per unit area and the actual irrigation area, the real blue water saving potential of the assessment area is calculated:

[0087]

[0088] Among them, WSP a-g Real water saving potential for blue water;

[0089] Finally, the real water-saving potential of the assessment area is evaluated based on the calculated real water-saving potential of green water and blue water.

[0090] Embodiment 2

[0091] This embodiment proposes an agricultural crop water-saving potential evaluation system. Figure 2 As shown, it includes an information collection module, a production water footprint calculation module, a benchmark determination module and a water saving potential assessment module connected in sequence;

[0092] The information collection module is used to collect basic information about the assessment area;

[0093] The production water footprint calculation module is used to calculate the crop production water footprint based on the basic data;

[0094] The benchmark determination module is used to determine the crop field production water footprint benchmark based on the crop production water footprint;

[0095] The water-saving potential assessment module is used to evaluate the water-saving potential of agricultural crops based on the crop production water footprint and the crop field production water footprint benchmark.

[0096] As a preferred embodiment, the information collection module includes a meteorological collection module, a production collection module, a soil collection module and an irrigation collection module. The meteorological collection module is used to collect meteorological data of the evaluation area, including precipitation on a daily or monthly scale, carbon dioxide concentration, maximum temperature, minimum temperature, relative humidity, wind speed and sunshine hours; the production collection module is used to collect crop production data, including crop varieties, crop planting distribution data, sowing area, planting density, leaf area index, sowing date, growth period, harvest date, harvest index and yield per unit area; the soil collection module is used to collect soil data, including soil texture, plow layer thickness, soil capacity and soil water content; the irrigation collection module is used to collect irrigation data, including actual irrigation area, irrigation quota, irrigation system, and irrigation water utilization coefficient.

[0097] As a preferred embodiment, the production water footprint calculation module includes a green water footprint calculation module and a blue water footprint calculation module;

[0098] The green water footprint calculation module calculates the ten-day precipitation according to the daily or monthly precipitation, and calculates the ten-day effective precipitation according to the ten-day precipitation; accumulates the effective precipitation of each ten-day to obtain the effective precipitation during the crop growth period; calculates the crop water requirement according to the crop coefficient and the crop evaporation and transpiration; calculates the part of the crop water consumption that comes from the effective precipitation according to the effective precipitation during the crop growth period and the crop water requirement; calculates the crop green water footprint according to the part of the crop water consumption that comes from the effective precipitation and the crop yield per unit area;

[0099] The blue water footprint calculation module calculates the portion of the crop water consumption that comes from irrigation water according to the crop water demand and the effective precipitation during the crop growth period, and calculates the crop blue water footprint according to the portion of the crop water consumption that comes from irrigation water and the crop yield per unit area.

[0100] As a preferred embodiment, the benchmark determination module includes a sample collection module and a benchmark calculation module;

[0101] Specifically, the sample collection module is used to collect cumulative sample statistics of the production in the assessment area;

[0102] When the number of samples is greater than or equal to 30, the benchmark calculation module arranges all samples in ascending order according to the production water footprint value. When the cumulative distribution curve of the corresponding yield of a certain crop reaches more than 20% of the total yield of all samples, the production water footprint value of the crop sample is used as the crop field production water footprint benchmark;

[0103] When the number of samples is less than 30, the benchmark calculation module calculates the crop production water footprint under different production management modes, and takes the minimum value of the crop production water footprint as the crop field production water footprint benchmark.

[0104] Furthermore, the water-saving potential assessment module includes an engineering water-saving potential assessment module and a real water-saving potential assessment module;

[0105] Specifically, the engineering water-saving potential assessment module calculates the engineering water-saving potential of the assessment area based on the crop green water footprint, crop blue water footprint and the crop field production water footprint benchmark, combined with the crop yield per unit area, the actual irrigation area, and the irrigation water utilization coefficient;

[0106] The real water-saving potential assessment module calculates the real water-saving potential of green water in the assessment area based on the crop green water footprint and the crop field production water footprint benchmark, combined with the crop unit area yield and the actual irrigation area, and calculates the real water-saving potential of blue water in the assessment area based on the crop blue water footprint and the crop field production water footprint benchmark, combined with the crop unit area yield and the actual irrigation area;

[0107] Finally, the real water-saving potential of the assessment area is evaluated based on the real water-saving potential of green water and the real water-saving potential of blue water.

[0108] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or perform equivalent replacements on some of the technical features thereof; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. They should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for evaluating the water-saving potential of agricultural crops, characterized in that: The following steps are involved: Collect basic information on the assessment area; Calculate the water footprint of crop production based on the basic data; determining a crop field production water footprint benchmark based on the crop production water footprint; The water-saving potential of agricultural crops is evaluated based on the crop production water footprint and the crop field production water footprint benchmark.

2. The method for evaluating the water-saving potential of agricultural crops according to claim 1, characterized in that: The basic data include meteorological data, crop production data, soil data, and irrigation data; the meteorological data include precipitation on a daily or monthly scale, carbon dioxide concentration, maximum temperature, minimum temperature, relative humidity, wind speed, and sunshine hours; the crop production data include crop varieties, crop planting distribution data, sowing area, planting density, leaf area index, sowing date, growth period, harvest date, harvest index, and yield per unit area; the soil data include soil texture, plow layer thickness, soil capacity, and soil moisture content; the irrigation data include actual irrigation area, irrigation quota, irrigation system, and irrigation water utilization coefficient.

3. The method for evaluating the water-saving potential of agricultural crops according to claim 2, characterized in that: The process of calculating the water footprint of crop production based on the basic data includes: Calculate the ten-day precipitation based on the daily or monthly precipitation, and calculate the ten-day effective precipitation based on the ten-day precipitation; accumulate the effective precipitation of each ten-day to obtain the effective precipitation during the crop growth period; Calculate the crop water requirement based on the crop coefficient and the crop evaporation and transpiration; calculate the portion of the crop water consumption that comes from effective precipitation based on the effective precipitation during the crop growth period and the crop water requirement; The green water footprint of crops is calculated based on the portion of crop water consumption that comes from effective precipitation and the crop yield per unit area; Calculate the portion of the crop water consumption that comes from irrigation water based on the crop water requirement and the effective precipitation during the crop growth period; The blue water footprint of crops was calculated based on the portion of crop water consumption that comes from irrigation water and the crop yield per unit area.

4. The method for evaluating the water-saving potential of agricultural crops according to claim 1, characterized in that: The process of determining a crop field production water footprint benchmark based on the crop production water footprint includes: Collect cumulative sample statistics of production in the assessment area. When the number of samples is greater than or equal to 30, arrange all samples in ascending order according to the production water footprint value. When the cumulative distribution curve of the corresponding production of a certain crop reaches more than 20% of the total production of all samples, the production water footprint value of the crop sample is used as the production water footprint benchmark of the crop field; When the number of samples is less than 30, the crop production water footprint under different production management modes is calculated, and the minimum value of the crop production water footprint is used as the benchmark for the crop field production water footprint.

5. The method for evaluating the water-saving potential of agricultural crops according to claim 3, characterized in that: The process of evaluating the water saving potential of agricultural crops based on the crop production water footprint and the crop field production water footprint benchmark includes: Based on the crop green water footprint, crop blue water footprint and the crop field production water footprint benchmark, combined with the crop yield per unit area, actual irrigation area, and irrigation water utilization coefficient, the engineering water saving potential of the assessment area is calculated; Based on the crop green water footprint and the crop field production water footprint benchmark, combined with the crop yield per unit area and the actual irrigation area, the green water real water saving potential of the assessment area is calculated; Based on the crop blue water footprint and the crop field production water footprint benchmark, combined with the crop yield per unit area and the actual irrigation area, the blue water real water saving potential of the assessment area is calculated; The real water-saving potential of the assessment area is evaluated based on the real water-saving potential of the green water and the real water-saving potential of the blue water.

6. An agricultural crop water-saving potential evaluation system, characterized in that: It includes an information collection module, a production water footprint calculation module, a benchmark determination module and a water saving potential assessment module which are connected in sequence; The information collection module is used to collect basic information about the assessment area; The production water footprint calculation module is used to calculate the crop production water footprint based on the basic data; The benchmark determination module is used to determine the crop field production water footprint benchmark based on the crop production water footprint; The water-saving potential assessment module is used to evaluate the water-saving potential of agricultural crops based on the crop production water footprint and the crop field production water footprint benchmark.

7. The agricultural crop water-saving potential evaluation system according to claim 6, characterized in that: The information collection module includes a meteorological collection module, a production collection module, a soil collection module and an irrigation collection module. The meteorological collection module is used to collect meteorological data of the assessment area, including precipitation on a daily or monthly scale, carbon dioxide concentration, maximum temperature, minimum temperature, relative humidity, wind speed and sunshine hours; the production collection module is used to collect crop production data, including crop varieties, crop planting distribution data, sowing area, planting density, leaf area index, sowing date, growth period, harvest date, harvest index and yield per unit area; the soil collection module is used to collect soil data, including soil texture, plow layer thickness, soil capacity and soil water content; the irrigation collection module is used to collect irrigation data, including actual irrigation area, irrigation quota, irrigation system, and irrigation water utilization coefficient.

8. The agricultural crop water-saving potential evaluation system according to claim 7, characterized in that: The production water footprint calculation module includes a green water footprint calculation module and a blue water footprint calculation module; The green water footprint calculation module calculates the ten-day precipitation according to the daily or monthly precipitation, and calculates the ten-day effective precipitation according to the ten-day precipitation; accumulates the effective precipitation of each ten-day to obtain the effective precipitation during the crop growth period; calculates the crop water requirement according to the crop coefficient and the crop evaporation and transpiration; calculates the part of the crop water consumption that comes from the effective precipitation according to the effective precipitation during the crop growth period and the crop water requirement; calculates the crop green water footprint according to the part of the crop water consumption that comes from the effective precipitation and the crop yield per unit area; The blue water footprint calculation module calculates the portion of the crop water consumption that comes from irrigation water according to the crop water demand and the effective precipitation during the crop growth period, and calculates the crop blue water footprint according to the portion of the crop water consumption that comes from irrigation water and the crop yield per unit area.

9. The agricultural crop water-saving potential evaluation system according to claim 6, characterized in that: The benchmark determination module includes a sample collection module and a benchmark calculation module; The sample collection module is used to collect cumulative sample statistics of the production in the assessment area; When the number of samples is greater than or equal to 30, the benchmark calculation module arranges all samples in ascending order according to the production water footprint value. When the cumulative distribution curve of the corresponding yield of a certain crop reaches more than 20% of the total yield of all samples, the production water footprint value of the crop sample is used as the crop field production water footprint benchmark; When the number of samples is less than 30, the benchmark calculation module calculates the crop production water footprint under different production management modes, and takes the minimum value of the crop production water footprint as the crop field production water footprint benchmark.

10. The agricultural crop water-saving potential evaluation system according to claim 8, characterized in that: The water-saving potential assessment module includes an engineering water-saving potential assessment module and a real water-saving potential assessment module; The engineering water-saving potential assessment module calculates the engineering water-saving potential of the assessment area based on the crop green water footprint, the crop blue water footprint and the crop field production water footprint benchmark, combined with the crop yield per unit area, the actual irrigation area, and the irrigation water utilization coefficient; The real water-saving potential assessment module calculates the real water-saving potential of green water in the assessment area based on the crop green water footprint and the crop field production water footprint benchmark, combined with the crop unit area yield and the actual irrigation area, and calculates the real water-saving potential of blue water in the assessment area based on the crop blue water footprint and the crop field production water footprint benchmark, combined with the crop unit area yield and the actual irrigation area; Finally, the real water-saving potential of the assessment area is evaluated based on the real water-saving potential of the green water and the real water-saving potential of the blue water.

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