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Estimation method of total nitrogen content in crop canopy leaf

A technology of crop canopy and nitrogen content, applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as lack of stability, neglect of mining applications, and little consideration of spectral differences in sunny days, etc., to improve comparability, accuracy, and scalability and stability enhancement, eliminating the effects of occasional cloud shadows

Active Publication Date: 2012-01-11
BEIJING RES CENT FOR INFORMATION TECH & AGRI
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Problems solved by technology

Because these two types of methods usually only use a few characteristic wavelengths, they often ignore the mining application of rich information in multiple bands of hyperspectral data, and in practical applications, they seldom consider the spectrum generated by temporary or accidental occlusion due to local cloud shadows. Due to the difference, the constructed nitrogen spectrum estimation method model often shows the limitations of poor scalability and lack of stability in the application of time and space

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  • Estimation method of total nitrogen content in crop canopy leaf
  • Estimation method of total nitrogen content in crop canopy leaf
  • Estimation method of total nitrogen content in crop canopy leaf

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Embodiment Construction

[0028] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] Such as figure 1 Shown, the method for estimating the total nitrogen content of the crop canopy blade of the present invention comprises steps:

[0030] S1: Measure the crop canopy, such as the hyperspectral data of the barley canopy in the range of 400nm to 760nm, calculate the spectral reflectance of the crop canopy and obtain its spectral reflectance curve;

[0031] In this step, a portable field spectrometer produced by ASD (Analytical Spectral Device) in the United States is used to measure the canopy spectrum of barley in the field from jointing to heading stage; the canopy includes at least leaves.

[0032] S2: Using the crop canopy spectral reflectance to ...

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Abstract

The invention discloses an estimation method of total nitrogen content in a crop canopy leaf, and relates to the technical field of spectrum non-destructive detection of biochemical components in a crop. The method comprises the following steps of: S1: determining hyperspectral data within the wave band range of 400nm-760nm of a crop canopy, calculating the spectral reflectance of the crop canopyand obtaining a spectral reflectance curve of the crop canopy; S2: calculating the relative spectral reflectance of the crop canopy by virtue of the spectral reflectance of the crop canopy and obtaining a relative spectral reflectance curve of the crop canopy; S3: respectively performing linear fitting on the relative spectral reflectance curves of two characteristic wave bands at 400nm-500nm and680nm-760nm in the relative spectral reflectance curve of the crop canopy and calculating the slopes of the two relative spectral reflectance curves; and S4: establishing an estimation model of the total nitrogen content in the crop canopy leaf by virtue of the ratio of the slopes of the relative spectral reflectance curves of the two characteristic wave bands at 680nm-760nm and 400nm-500nm so asto realize estimation of the total nitrogen content in the crop canopy leaf. By adopting the estimation method, the estimation model of the biochemical components in crop nitrogen can be established,and the model has strong expandability and high stability.

Description

technical field [0001] The invention relates to the technical field of spectral non-destructive detection of crop biochemical components, in particular to a method for estimating the total nitrogen content of crop canopy leaves. Background technique [0002] Nitrogen is the main nutrient element required by crops including barley, which directly affects the growth and development of crops and the formation of yield and quality. Real-time, rapid and accurate detection of the nitrogen content level of crop canopy leaves is conducive to scientifically and rationally guiding nitrogen fertilizer application, reducing environmental pollution caused by excessive nitrogen application, and improving crop yield and quality, which has important practical significance and Application value, the total nitrogen content of the present invention specifically refers to the total amount of nitrogen contained in the unit dry weight of crop canopy leaves, multiplied by 100 and expressed as a pe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
Inventor 赵春江徐新刚王纪华黄文江李存军宋晓宇杨小冬顾晓鹤杨贵军杨浩
Owner BEIJING RES CENT FOR INFORMATION TECH & AGRI
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