Near infrared spectrum technology-based multiband soil nitrogen detection device and method

A technology of near-infrared spectroscopy and detection devices, which is applied in the field of multi-band soil nitrogen detection devices, can solve the problems of staying, no portable soil nitrogen level detection equipment, etc., and achieve good growth, reduce costs, and shorten time

Inactive Publication Date: 2011-02-16
CHINA AGRI UNIV
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Problems solved by technology

[0005] At present, most of the relevant research at home and abroad is still in the theoretical research stage of soil nitrogen prediction, and there is no portable soil nitrogen level detection equipment.

Method used

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  • Near infrared spectrum technology-based multiband soil nitrogen detection device and method
  • Near infrared spectrum technology-based multiband soil nitrogen detection device and method
  • Near infrared spectrum technology-based multiband soil nitrogen detection device and method

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Embodiment Construction

[0046] Firstly, a regression model between soil nitrogen content and near-infrared spectral data was established. The method provided by the invention adopts the combination of wavelet packet analysis and partial least square method to establish a prediction model.

[0047] Wavelet packet analysis is implemented in Matlab 7 using wavelet packet analysis theory programming, and Biorthogonal wavelet is selected as the mother wavelet of wavelet packet analysis. Through the curve observation experiment of the number of layers decomposed by the wavelet packet, it is determined that the signal is decomposed by the 8-layer Biorthogonal wavelet packet. Feature spectrum extraction process and results such as figure 1 As shown, among them, (a): original spectrum; (b): low frequency coefficient of node [8 0]; (c): reconstructed node [8 0]; (d): node [8 255] Low-frequency coefficients; (e): reconstructed [8 255] nodes; (f): characteristic curves.

[0048] After decomposing the characte...

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Abstract

The invention provides a near infrared spectrum technology-based multiband soil nitrogen detection device and a near infrared spectrum technology-based multiband soil nitrogen detection method. A regression equation of near infrared spectrum data and soil sample nitrogen content is established by establishing a soil nitrogen prediction model and using soil spectrum absorbance of seven bands so asto accurately measure the soil nitrogen level. The device and the method have high practical precision, are not affected by weather factors, are suitable for real-time field measurement, provide storage function of a U disk, and are convenient for storing historic records, calling the data and realizing a soil nitrogen distribution graph.

Description

technical field [0001] The invention belongs to the technical field of spectrum detection, and in particular relates to a multi-band soil nitrogen detection device and method based on near-infrared spectrum technology. Background technique [0002] Soil nutrient parameters (mainly nitrogen, phosphorus, potassium and organic matter content) are important soil fertility indicators, which reflect the ability of soil to supply crop growth. Nitrogen is mainly to promote the individual growth of plant roots, stems and leaves, and is the primary nutrient element to form a certain quality product. The degree of its abundance directly affects the growth of plants, harvested products and their quality. [0003] Near Infrared Spectroscopy (Near Infrared Reflectance Spectroscopy, NIRS) analysis method can be used to predict the total nitrogen level in the soil. The basic process is: firstly, select a suitable sample set, perform spectral scanning, and establish a calibration model of so...

Claims

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Application Information

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IPC IPC(8): G01N21/49
Inventor 李民赞安晓飞郑立华安登奎张泽
Owner CHINA AGRI UNIV
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