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Method for detecting nitrogen content in fresh tea by visible light-near infrared diffuse reflection spectrum technology

A spectroscopic technique, a technique of fresh tea leaves, applied in the measurement of scattering characteristics, etc., to achieve the effect of direct and reliable information

Inactive Publication Date: 2009-03-11
JIANGSU YINCHUNBIYA TEA RES INST +1
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Problems solved by technology

But the difficulty lies in how to quickly establish a spectral model of the nitrogen content of fresh tea leaves and quickly conduct field testing

Method used

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  • Method for detecting nitrogen content in fresh tea by visible light-near infrared diffuse reflection spectrum technology
  • Method for detecting nitrogen content in fresh tea by visible light-near infrared diffuse reflection spectrum technology
  • Method for detecting nitrogen content in fresh tea by visible light-near infrared diffuse reflection spectrum technology

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Embodiment Construction

[0018] The technical system of the method for detecting the nitrogen content of fresh tea leaves using visible-near-infrared diffuse reflectance spectroscopy is composed of a portable radiation spectrometer, a computer, a standard whiteboard, a power supply, a Kjeldahl nitrogen analyzer, a chlorophyll analyzer, and chemometric software, combined with the attached A specific implementation of the method is illustrated in the figure.

[0019] Choose a sunny day with strong solar radiation and no clouds, and the spectrum collection period is from 10:00 am to 15:00 pm. Canopy fresh tea leaf samples were marked in the tea garden and divided into calibration samples and test samples. The FieldSpec 3 portable radiation spectrometer from ASD Company of the United States is selected, and the probe with an 8° field of view is selected, and the diffuse reflection method is adopted. When measuring, keep the spectrometer 2 to 3 cm away from the sample surface to ensure that the field of v...

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Abstract

The invention relates to a method for detecting the nitrogen content in fresh tea leaves by a visible and near-infrared diffuse reflection spectrum technology, belonging to the technical field of agriculture and forestry life information detecting. The method comprises the steps: firstly, a portable radiation spectrometer is utilized to acquire diffuse reflection spectral information on the fresh tea leaves of a canopy in the range 350 to 2500nm; the nitrogen content in fresh tea leaves is accurately measured by a national standard method in a laboratory and the relative value of the nitrogen content in fresh tea leaves is measured fast by an SPAD and the like; then a calibration model of the nitrogen content in fresh tea leaves is established by a chemometrics method; and finally, the calibration model is used for detecting or evaluating the nitrogen content of fresh tea leaves to be detected. The method can detect the nitrogen content in fresh tea leaves quickly and accurately without damages, and conveniently estimate the nitrogen nutrition level of tea plants, thus providing parameter basis and guidance for the fertilizing management in tea garden field.

Description

technical field [0001] The invention belongs to the technical field of agriculture and forestry life information detection. The invention relates to a method for detecting the nitrogen content of plant leaves based on spectral analysis technology, in particular to a method for rapidly and nondestructively detecting the nitrogen content of fresh tea leaves based on visible-near infrared diffuse reflectance spectroscopy technology. Background technique [0002] The average content of nitrogen in tea leaves is about 1.5% of the dry weight. It is an important part of the synthesis of protein and chlorophyll, and participates in the synthesis of enzymes. It directly or indirectly affects the metabolic activities and growth of tea trees in many ways, especially for The amount of amino acid content of active ingredients in tea is of great significance. Therefore, monitoring nitrogen nutrition status is one of the main contents in the process of tea tree cultivation and management....

Claims

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Application Information

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IPC IPC(8): G01N21/47
Inventor 胡永光李萍萍陈斌母建华崔桂玲
Owner JIANGSU YINCHUNBIYA TEA RES INST
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