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Fresh tea leaf fluorine content non-destructive rapid determination method

A determination method and technology of fresh leaves of tea trees, which is applied in the field of non-destructive and rapid determination of fluorine content in fresh leaves of tea trees, can solve problems in the field of unapplied tea fluorine research, and achieve the effect of source control, real-time performance, and reasonable design

Active Publication Date: 2013-09-25
TEA RES INST CHINESE ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the chlorophyll meter has been successfully applied to crops such as rice, wheat, corn, lettuce, cotton, potato, etc. It has also been used in fertilization of tea trees, but it has not been used in the research field of tea fluorine.

Method used

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  • Fresh tea leaf fluorine content non-destructive rapid determination method
  • Fresh tea leaf fluorine content non-destructive rapid determination method
  • Fresh tea leaf fluorine content non-destructive rapid determination method

Examples

Experimental program
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Effect test

experiment example 1

[0020] In 2012, an experiment was carried out on the production tea garden, and SPAD and F content were detected synchronously for the young tea trees in the tea garden with different nitrogen fertilizer application rates under the same site conditions, and the leaves of different leaf ages were selected during the detection. , the test is carried out by tag marking method.

[0021] The experiment was carried out on tea gardens designed with different nitrogen fertilizer application rates. The total annual nitrogen fertilizer application amounts in the tea gardens were 0, 119, 285, 474, 569 and 712 kg N / ha, and each nitrogen fertilizer application had 4 plots. 24 districts. Leaf sampling starts from one week after the initial exhibition to the 5th-6th leaf, that is, the leaf age of the tag leaves is 8, 15, 22, 29 and 36 days, respectively. Use SPAD-502 instrument to detect the SPAD value of fresh leaves, and at the same time take them back to the laboratory for drying and cru...

experiment example 2

[0029] In May 2013, an experiment was carried out on another production tea garden, and a total of 100 leaves were picked from the first expanded leaf, the second leaf, the third leaf, the fourth leaf, the fifth leaf and the sixth leaf, and were measured on-site by SPAD-502 SPAD value. After being brought back to the laboratory, dried and pulverized, the fluorine content of each leaf was measured with a fluoride ion selective electrode. Analysis of the correlation between leaf SPAD value and fluorine content shows that there is a very significant correlation between the two (R=0.595), and the correlation equation is ( figure 2 ).

[0030] Randomly collect the third, fourth, fifth and sixth leaves of Xinshao on the tea garden, measure the SPAD value, calculate the fluorine content of the tea according to the SPAD value and the equation, and use the ion-selective electrode to measure the fluorine content to the equation The accuracy was verified and the results are shown in...

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Abstract

The invention relates to a fresh tea leaf fluorine content non-destructive rapid determination method, and belongs to the technical field of agricultural productions. The method comprises the steps that: SPAD value determination is carried out, a fluorine content is determined; a correlation equation of SPAD and fluorine content is determined; an actually needed tea leaf fluorine content control standard is introduced into the linear equation, such that the SPAD value controlled within the fluorine content standard is obtained; during field picking, the leaves are subjected to SPAD value non-destructive rapid detection, and leaves within the SPAD value control range are picked; and during field picking, the leaves are subjected to SPAD value non-destructive rapid detection; and the result is introduced in the correlation equation of SPAD and fluorine content, such that leaf fluorine content is determined. The method provided by the invention has certain practical guidance function on low-fluorine fresh leaf raw material picking. With the method, fresh leaf raw material fluorine content in-situ rapid determination can be realized without bringing the raw material back to a laboratory, such that a defect of picking and then detecting is overcome. Source control and real-time detection are realized, and detection and picking are both carried out on site. Therefore, various defects of prior art are overcome.

Description

technical field [0001] The invention belongs to the technical field of agricultural production, and in particular relates to a non-destructive and rapid method for determining the fluorine content of fresh leaves of tea trees. Background technique [0002] Fluorine is widely distributed in nature and is one of the essential trace elements for the human body. It plays an important role in human growth and bone metabolism. Adequate intake of fluorine is beneficial to health. However, excessive intake of fluorine can lead to fluorosis, mainly Manifested as dental fluorosis and skeletal fluorosis. Tea tree is a typical polyfluoride plant, and the fluorine content in tea leaves is 1-2 orders of magnitude higher than that of ordinary plants. Controlling the fluorine content of tea in actual production has become one of the key factors affecting the quality and safety of tea. There was a significant positive correlation between fluorine accumulation in leaves of tea trees and lea...

Claims

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Application Information

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IPC IPC(8): G01N21/25
Inventor 伊晓云阮建云石元值马立锋
Owner TEA RES INST CHINESE ACAD OF AGRI SCI
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