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Winter wheat regional crop coefficient measuring and calculating method

A technology of winter wheat and coefficient method, which is applied in the field of winter wheat regional crop coefficient calculation, can solve problems that cannot be directly applied, cannot replace the average value, and the representativeness of crop coefficients is not known.

Active Publication Date: 2020-06-09
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0006]The current crop coefficient calculation method is based on irrigation experiments, and the crop coefficient empirical formula established through linear or nonlinear regression does not have a good physical basis. The crop coefficient empirical formula on the point scale of the irrigation experiment is closely related to the local meteorology, soil, crops, etc., and cannot be directly applied in other areas without data; and the crop coefficient recommended by the FAO56 single crop coefficient method and double crop coefficient method is not Tailor-made for the Chinese region, many studies have shown that the single-crop coefficient method and the double-crop coefficient method have large errors in calculating the crop coefficient in China; and the crop coefficient obtained by the single-crop coefficient method is still point-scale, and point-scale data cannot It can be directly used in other points, and it cannot replace the average value on a certain larger area. The spatial representativeness of the crop coefficient has no known defects and problems. The present invention provides a method for measuring and calculating the regional crop coefficient of winter wheat

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  • Winter wheat regional crop coefficient measuring and calculating method
  • Winter wheat regional crop coefficient measuring and calculating method
  • Winter wheat regional crop coefficient measuring and calculating method

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Embodiment 1

[0024] Embodiment 1: the technical roadmap of the present invention sees figure 1 . Firstly, the basic data are processed, and the research area is divided into subregions to determine the typical climate conditions in the early, mid-growth, and late-growth stages of each subregion.

[0025] Secondly, according to different divisions, the average value of the measured value of the winter wheat crop coefficient is replaced by the recommended value of the crop coefficient of the FAO56 single crop coefficient method, and the average value of the measured 2m wind speed and the minimum relative humidity of the meteorological stations in different regions is replaced by the 2m value of the FAO56 single crop coefficient method. The defined values ​​of wind speed and minimum relative humidity (2m / s and 45%) are used to obtain the improved single crop coefficient method. It is worth noting that 2m / s and 45% are data under "standard meteorological conditions", which are defined as sub-...

Embodiment 2

[0055] Embodiment 2: This embodiment provides another method for calculating the crop coefficient of winter wheat, specifically as follows.

[0056] The first step is to partition the research area, collect the meteorological data of the irrigation experiment and the water demand experiment of winter wheat in the research area, and divide the whole growth period of winter wheat in different regions into early growth period, rapid growth period, middle growth period and late growth period;

[0057] The second step is to determine the typical climate conditions in the early, middle and late growth stages of each subregion, that is, to determine the multi-year average measured value of 2m wind speed (u 2(obs) ) and minimum relative humidity (RH min(obs) ) The average measured value for many years;

[0058] The third step is to carry out the water demand test of winter wheat according to each zone, and to measure the water demand ET of winter wheat in the early growth stage, midd...

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Abstract

The invention belongs to the technical field of crop coefficient measuring and calculating methods, and particularly relates to a regional winter wheat crop coefficient measuring and calculating method. The method is based on a single-crop coefficient method, the single-crop coefficient method is improved in combination with reality, an improved single-crop coefficient method formula serves as anexpression to be substituted into a map algebra, regional crop coefficient calculation is conducted on each pixel of a grid map, and therefore the regional winter wheat crop coefficient map is obtained. According to the method, a crop coefficient basic recommendation value and a correction formula suitable for Chinese planting subareas are provided; a regional single crop coefficient method is provided by combining with map algebra, and verification is performed by using measured water demand data of winter wheat, so that an effective way is provided for solving the problem of point-to-surfaceconversion of crop coefficients, and technical support is provided for farmland water conservancy engineering planning, design and management, inter-regional water distribution and cross-basin waterdistribution.

Description

technical field [0001] The invention belongs to the technical field of crop coefficient calculation methods, and in particular relates to a method for measuring and calculating winter wheat regional crop coefficients. Background technique [0002] Wheat is one of the three major food crops in the world. Winter wheat accounts for 91% of the total wheat production and 90% of the sown area. The level of winter wheat production directly determines the total wheat production in my country, and irrigation is an important guarantee for wheat production. Irrigation water is the main component of agricultural water use. Irrigation water accounts for more than 90% of agricultural water use in my country. Crop water demand is the basis for formulating irrigation systems and an important basis for realizing agricultural water saving. Efficiency matters. Crop water demand is the sum of the water demand for inter-tree evaporation, plant transpiration, plant body composition, photosynthesi...

Claims

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Application Information

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IPC IPC(8): G06F17/10G01N33/00A01G25/16
CPCG06F17/10G01N33/0098A01G25/16Y02A20/152
Inventor 张磊葛建坤李彦彬汪顺生
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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