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Construction method of wheat powdery mildew illness monitoring model and monitoring method adaptive to wide angle

A technology of wheat powdery mildew and construction method, which is applied in the direction of material excitation analysis, etc., can solve the problems of large errors in vegetation growth parameters, etc., and achieve the effect of wide monitoring angle and wide applicability

Active Publication Date: 2019-04-09
HENAN AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the objectives of the present invention is to provide a method for constructing a wheat powdery mildew condition monitoring model to solve the problem that the theoretically measured wheat powdery mildew condition index and the actual Technical problem of large error of vegetation growth parameters

Method used

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  • Construction method of wheat powdery mildew illness monitoring model and monitoring method adaptive to wide angle
  • Construction method of wheat powdery mildew illness monitoring model and monitoring method adaptive to wide angle
  • Construction method of wheat powdery mildew illness monitoring model and monitoring method adaptive to wide angle

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Effect test

Embodiment 1

[0049] Embodiment 1: the construction method of wheat powdery mildew condition monitoring model, comprises the following steps:

[0050] The original spectral data of winter wheat canopy reflected directly upward under the state of powdery mildew stress is obtained in the main plane of the sun. These original spectral data cover 400-900nm light waves, and the corresponding wheat powdery mildew disease index data at the time of collection, at 400-900nm The combination of two bands (the wavelength interval of each band is 2nm) was randomly selected in the original reflectance spectrum, and the normalized difference vegetation index (NDVI) and ratio vegetation index (RVI) were used to determine the spectral index of winter wheat canopy under powdery mildew stress. Matlab data analysis software was used to analyze the coefficient of determination of fitting between NDVI or RVI parameters and the severity of agronomic parameters ( R 2 ), standard error (SE) and mean square error (...

Embodiment 2

[0059] Embodiment 2: a kind of wheat powdery mildew condition monitoring method that wide angle adapts, comprises the following steps:

[0060] Obtain the reflectance R of winter wheat canopy to 744nm light wave under the state of powdery mildew stress in the angle range of 0°~+30° in the main plane of the sun 744 , the reflectance R for 762 nm light waves 762 And the reflectivity R of 710 nm light wave 710 , among them, see figure 1 , in the main plane of the sun, the monitoring angle perpendicular to the wheat canopy is defined as 0°, and when the observation direction is on the same side as the sun’s irradiation direction, it is defined as the backward direction, corresponding to -90°~0°, and the observation direction is in the sun’s irradiation direction The opposite side is defined as forward, corresponding to 0°~+90°;

[0061] Modified Ratio Vegetation Index Formula mRVI= R for Monitoring the Condition of Wheat Powdery Mildew 744 / R 762 -0.5×R 710 , where R 744 Co...

Embodiment 3

[0063] Embodiment 3: a kind of wheat powdery mildew condition monitoring method that wide angle adapts, comprises the following steps:

[0064] Obtain the reflectance R of winter wheat canopy to 744nm light wave under the state of powdery mildew stress in the angle range of +10°~+20° in the main plane of the sun 744 , the reflectance R for 762 nm light waves 762 And the reflectivity R of 710 nm light wave 710 ,, where, in the main plane of the sun, the monitoring angle perpendicular to the wheat canopy is defined as 0°, and when the observation direction is on the same side as the sun’s irradiation direction, it is defined as backward, corresponding to -90°~0°, and the observation direction is between the sun It is defined as the forward direction when the illumination direction is on the opposite side, corresponding to 0°~+90°;

[0065] Modified Ratio Vegetation Index Formula mRVI= R for Monitoring the Condition of Wheat Powdery Mildew 744 / R 762 -0.5×R 710 , where R 74...

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Abstract

The invention relates to a construction method of a wheat powdery mildew illness monitoring model. The construction method comprises the steps of: obtaining winter wheat canopy original spectrum datain the main plane vertical angle and wheat powdery mildew illness index data under the stress of the powdery mildew, selecting a wavelength lambda1 and a wavelength lambda2 from wavebands with determination coefficients R<2> between a canopy spectrum index and a wheat powdery mildew illness index being not smaller than 0.5, and introducing a regulation parameter K and a reflectivity K*Rlambda3 corresponding to a wavelength lambda3 to construct a corrected specific value vegetation index as shown in the description. A wheat powdery mildew illness monitoring method adaptive to a wide angle comprises the steps of: obtaining reflectivity data when light with wavelengths of 744nm, 762nm and 710nm irradiates a winter wheat canopy under the stress of the powdery mildew within an angle range of 0-+30 degrees from the main plane to obtain a corresponding corrected specific value vegetation index as shown in the description. The construction method of a wheat powdery mildew illness monitoring model and the wheat powdery mildew illness monitoring method adaptive to a wide angle allow a wide monitoring angle when the wheat powdery mildew illness is monitored and are wide in applicability.

Description

technical field [0001] The invention relates to the technical field of crop powdery mildew condition measurement technology, in particular to a method for constructing a wheat powdery mildew condition monitoring model, and also relates to a wide-angle adaptive wheat powdery mildew condition monitoring method. Background technique [0002] Global warming can easily lead to the spread and prevalence of crop diseases and insect pests, and the occurrence of diseases and insect pests can significantly affect the yield and quality of crops, causing serious economic losses. With the continuous improvement of crop yield level, irrigation and fertilization, the increase of density and biomass will inevitably lead to the deterioration of the micro-ecological environment of the canopy, resulting in the continuous occurrence of major diseases and insect pests such as wheat rust, powdery mildew and aphids. Although the extensive use of pesticides can prevent the degree of pest damage and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/63
CPCG01N21/63
Inventor 冯伟齐双丽贺利姜玉梅王永华郭天财
Owner HENAN AGRICULTURAL UNIVERSITY
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