CN112989560A - Method for calculating water demand of crops based on soil moisture meteorological data - Google Patents
Method for calculating water demand of crops based on soil moisture meteorological data Download PDFInfo
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- CN112989560A CN112989560A CN202110095862.7A CN202110095862A CN112989560A CN 112989560 A CN112989560 A CN 112989560A CN 202110095862 A CN202110095862 A CN 202110095862A CN 112989560 A CN112989560 A CN 112989560A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G25/00—Watering gardens, fields, sports grounds or the like
- A01G25/16—Control of watering
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Mining
Abstract
The invention relates to a method for calculating water demand of crops based on soil moisture meteorological data, which comprises the following specific steps: 1) selecting a planting area with a soil moisture weather station, and acquiring the planting area A and the information of planted crops in the area; 2) acquiring daily weather information of the soil moisture content weather station in nearly 90 days; 3) and (3) calculating the daily reference transpiration rate of the typical crop in nearly 90 days of the benchmark period by adopting a Peneman formula according to weather information: 4) root calculation of daily water demand of crops for nearly 90 days: 5) calculating the net water demand of the crops according to the rainfall information collected by the soil moisture weather station: 6) the daily IR values are a slowly changing regular curve, and the 90 day data are fitted to a calculation formula using a MATLAB tool or other mathematical model program: input is day x, output is the value of IR: 7) the net irrigation water requirement of the crops in the area in the next few days is estimated. The invention has the advantages that: the method for calculating the water demand of the crops based on the soil moisture meteorological data can quickly and accurately predict the water demand of the crops.
Description
Technical Field
The invention relates to the technical field of agricultural production, in particular to a method for calculating water demand of crops based on soil moisture meteorological data.
Background
China is a country with serious water shortage, and the average water resource occupation of China is only 1/4 on the average level in the world. The agricultural water waste is quite serious, the utilization rate is low, and the development of water-saving agriculture is one of the major measures of the sustainable development strategy in China. The water demand of crops is an important component of agricultural water, the water demand of crops is reasonably and accurately estimated, and a basis for determining a scientific and reasonable crop irrigation system, regional irrigation water consumption and implementing fine irrigation is provided. At present, most agricultural irrigation is carried out through artificial experience. Crop water demand depends on the internal and external factors of crop growth and development and water demand. The internal factors refer to biological characteristics which have influence on water demand rules and are related to crop types, varieties and growth stages, and the external factors refer to climatic conditions (including solar radiation, air temperature, relative humidity, water surface evaporation capacity, wind speed and the like) and soil conditions (including soil texture, water content and the like). The complex factors make it currently difficult to reasonably determine crop water demand. For better growth of crops, irrigation should not be carried out when the crops lack water, and the water demand should be estimated in advance so as to pre-store water in soil.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for calculating the water demand of crops based on soil moisture meteorological data, and the method for calculating the water demand of crops based on soil moisture meteorological data can quickly and accurately predict the water demand of crops.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for calculating water demand of crops based on soil moisture meteorological data comprises the following specific steps:
1) selecting a planting area with a soil moisture weather station, and acquiring the planting area A and the information of planted crops in the area;
2) acquiring weather information of the soil moisture content weather station every day for nearly 90 days: radiation, air humidity, temperature, wind speed and rainfall;
3) and (3) calculating the daily reference transpiration rate of the typical crop in nearly 90 days of the benchmark period by adopting a Peneman formula according to weather information:
wherein, ET0As a reference transpiration rate; delta is the slope of the saturated vapor pressure-temperature curve; rnNet radiation of typical crop canopy; g is energy consumed by the heat-increasing soil; gamma is a hygrometer constant; t is the average air temperature; u shape22m high wind speed; e.g. of the typeaSaturated water vapor pressure; e.g. of the typedThe water vapor pressure is actually observed;
4) calculating the daily water demand of the crops in nearly 90 days according to the transpiration rate of the crops and the crop coefficient of the current growth period:
ETC＝KCET0
wherein, ETcWater requirement of crops, KcCoefficient of crop plants, ET0Is a calculation result in units of days;
5) calculating the net water demand of the crops according to the rainfall information collected by the soil moisture weather station:
IR＝ETC-PC
wherein IR is the net irrigation water demand of the crop in daily units, ET0For calculation results in units of days, PcAccumulating the collected daily effective rainfall;
6) the daily IR values are a slowly changing regular curve, and the 90 day data are fitted to a calculation formula using a MATLAB tool or other mathematical model program: input is day x, output is the value of IR:
IR＝a1*D3+b1*D2+c1*D
d is the day a1，b1，c1The values of each period of time are different for fixed parameters, and real-time calculation is needed;
7) and (4) estimating the net irrigation water requirement of the crops in the area in the next few days by the formula of the step 6).
As a refinement, D in the step 6) is based on 90 days.
After adopting the structure, the invention has the following advantages:
the invention can quickly and accurately predict the water demand of crops, reasonably and accurately predict the water demand of crops through the rainfall of the past ninety days, and can determine a scientific and reasonable crop irrigation system, regional irrigation water consumption and implement fine irrigation.
Drawings
FIG. 1 is a schematic diagram of the structure of the patent title of this invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
With reference to the attached drawing 1, a method for calculating the water demand of crops based on soil moisture meteorological data comprises the following specific steps:
1) selecting a planting area with a soil moisture weather station, and acquiring the planting area A and the information of planted crops in the area;
2) acquiring weather information of the soil moisture content weather station every day for nearly 90 days: radiation, air humidity, temperature, wind speed and rainfall;
3) and (3) calculating the daily reference transpiration rate of the typical crop in nearly 90 days of the benchmark period by adopting a Peneman formula according to weather information:
wherein, ET0As a reference transpiration rate; delta is the slope of the saturated vapor pressure-temperature curve; rnNet radiation of typical crop canopy; g is energy consumed by the heat-increasing soil(ii) a Gamma is a hygrometer constant; t is the average air temperature; u shape22m high wind speed; e.g. of the typeaSaturated water vapor pressure; e.g. of the typedThe water vapor pressure is actually observed;
4) calculating the daily water demand of the crops in nearly 90 days according to the transpiration rate of the crops and the crop coefficient of the current growth period:
ETC＝KCET0
wherein, ETcWater requirement of crops, KcCoefficient of crop plants, ET0Is a calculation result in units of days;
Kcexample crop coefficients:
5) calculating the net water demand (unit mm) of crops according to the rainfall information collected by the soil moisture weather station:
IR＝ETC-PC
wherein IR is the net irrigation water demand of the crop in daily units, ET0For calculation results in units of days, PcAccumulating the collected daily effective rainfall;
6) the daily IR values are a slowly changing regular curve, and the 90 day data are fitted to a calculation formula using a MATLAB tool or other mathematical model program: input is day x, output is the value of IR:
IR＝a1*D3+b1*D2+c1*D
d is the day a1，b1，c1The values of each period of time are different for fixed parameters, and real-time calculation is needed;
7) estimating the net irrigation water requirement of the crops in the area in the next few days by the formula of the step 6):
for example, calculate the net irrigation water demand for crops 3 days in the future:
substituting 91,92,93 into the formula of step 6, calculating IR1，IR2，IR3. A is the planting area of the area.
Total IR ═ IR (IR)1+IR2+IR2)*A。
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A method for calculating water demand of crops based on soil moisture meteorological data is characterized by comprising the following steps: the method comprises the following specific steps:
1) selecting a planting area with a soil moisture weather station, and acquiring the planting area A and the information of planted crops in the area;
2) acquiring weather information of the soil moisture content weather station every day for nearly 90 days: radiation, air humidity, temperature, wind speed and rainfall;
3) and (3) calculating the daily reference transpiration rate of the typical crop in nearly 90 days of the benchmark period by adopting a Peneman formula according to weather information:
wherein, ET0As a reference transpiration rate; delta is the slope of the saturated vapor pressure-temperature curve; rnNet radiation of typical crop canopy; g is energy consumed by the heat-increasing soil; gamma is a hygrometer constant; t is the average air temperature; u shape22m high wind speed; e.g. of the typeaSaturated water vapor pressure; e.g. of the typedThe water vapor pressure is actually observed;
4) calculating the daily water demand of the crops in nearly 90 days according to the transpiration rate of the crops and the crop coefficient of the current growth period:
ETC＝KCET0
wherein, ETcWater requirement of crops, KcCoefficient of crop plants, ET0Is a calculation result in units of days;
5) calculating the net water demand of the crops according to the rainfall information collected by the soil moisture weather station:
IR＝ETC-PC
wherein IR is the net irrigation water demand of the crop in daily units, ET0For calculation results in units of days, PcAccumulating the collected daily effective rainfall;
6) the daily IR values are a slowly changing regular curve, and the 90 day data are fitted to a calculation formula using a MATLAB tool or other mathematical model program: input is day x, output is the value of IR:
IR＝a1*D3+b1*D2+c1*D
d is the day a1，b1，c1The values of each period of time are different for fixed parameters, and real-time calculation is needed;
7) and (4) estimating the net irrigation water requirement of the crops in the area in the next few days by the formula of the step 6).
2. The method of claim 1, wherein the method comprises the steps of: d in the step 6) is based on 90 days.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114642159A (en) * | 2022-03-23 | 2022-06-21 | 华中科技大学 | Facility crop irrigation quota calculation method and system |
| CN116664340A (en) * | 2023-07-25 | 2023-08-29 | 长江信达软件技术（武汉）有限责任公司 | Irrigation area level water quantity scheduling method suitable for arid regions |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995022799A1 (en) * | 1994-02-17 | 1995-08-24 | Waterlink Systems, Inc. | Evapotranspiration forecasting irrigation control system |
| CN109508888A (en) * | 2018-11-19 | 2019-03-22 | 湖北省水利水电科学研究院 | Shrimp rice makees irrigation norm calculation method altogether |
| CN109657854A (en) * | 2018-12-13 | 2019-04-19 | 中国农业科学院农田灌溉研究所 | A kind of method, system and the equipment of water demand of crop prediction |
| CN110580657A (en) * | 2019-10-12 | 2019-12-17 | 中国水利水电科学研究院 | agricultural irrigation water demand prediction method |
-
2021
- 2021-01-25 CN CN202110095862.7A patent/CN112989560A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995022799A1 (en) * | 1994-02-17 | 1995-08-24 | Waterlink Systems, Inc. | Evapotranspiration forecasting irrigation control system |
| CN109508888A (en) * | 2018-11-19 | 2019-03-22 | 湖北省水利水电科学研究院 | Shrimp rice makees irrigation norm calculation method altogether |
| CN109657854A (en) * | 2018-12-13 | 2019-04-19 | 中国农业科学院农田灌溉研究所 | A kind of method, system and the equipment of water demand of crop prediction |
| CN110580657A (en) * | 2019-10-12 | 2019-12-17 | 中国水利水电科学研究院 | agricultural irrigation water demand prediction method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114642159A (en) * | 2022-03-23 | 2022-06-21 | 华中科技大学 | Facility crop irrigation quota calculation method and system |
| CN114642159B (en) * | 2022-03-23 | 2022-11-08 | 华中科技大学 | Facility crop irrigation quota calculation method and system |
| CN116664340A (en) * | 2023-07-25 | 2023-08-29 | 长江信达软件技术（武汉）有限责任公司 | Irrigation area level water quantity scheduling method suitable for arid regions |
| CN116664340B (en) * | 2023-07-25 | 2023-12-12 | 长江信达软件技术（武汉）有限责任公司 | Irrigation area level water quantity scheduling method suitable for arid regions |
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