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Detection method of SPAD (soil and plant analyzer development) indexes of tea leaves

A detection method and index technology, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of sampling error and the inability to detect leaf SPAD values ​​at the same time, and achieve the effects of faster detection speed, quantitative and positioning detection, and simple calculation methods

Active Publication Date: 2014-02-19
ZHEJIANG UNIV
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Problems solved by technology

[0005] The present invention judges the growth status of cotton by the measured SPAD value, and guides the fertilization management in cotton production, but the measurement range of the SPAD-502 chlorophyll meter is only 2x3mm, and it is indicated by measuring the SPAD index in this small area The chlorophyll level of the whole plant leaves not only has sampling error, but also cannot detect the SPAD value at each point of the leaf at the same time, not to mention the simultaneous detection of the SPAD index at each point of the canopy leaf

Method used

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  • Detection method of SPAD (soil and plant analyzer development) indexes of tea leaves
  • Detection method of SPAD (soil and plant analyzer development) indexes of tea leaves
  • Detection method of SPAD (soil and plant analyzer development) indexes of tea leaves

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Embodiment 1

[0049] Firstly, 1057 tea leaves were collected. The varieties of tea leaves include 11 varieties of tea such as Jiukeng, Biyun, and Juhuaxiang. Firstly, a hyperspectral imaging system (ImSpector V10E, Spectral Imaging Ltd., Oulu, Finland) was used to scan each A single-band spectral image of a tea leaf at six characteristic wavelengths; the six characteristic wavelengths are 409nm, 428nm, 496nm, 506nm, 530nm, and 1000nm; each wavelength corresponds to a single-band spectral image, such as figure 1As shown, the SPAD index of these 1057 samples was measured respectively using the SPAD-502 chlorophyll meter produced by Japan KONICA MINOLTA Company, and the statistical results of the SPAD index of tea leaves are shown in Table 1.

[0050] When using the SPAD-502 chlorophyll meter to detect the SPAD index of tea leaves, three positions were randomly selected on each tea leaf to measure the SPAD index, and the average result of the three positions was used as the SPAD index of the te...

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Abstract

The invention discloses a detection method of SPAD (soil and plant analyzer development) indexes of tea leaves, and the detection method comprises the following steps: (1) collecting single band spectra images of to-be-detected tea leaves in six characteristic wavelengths, and the six characteristic wavelengths being 409nm, 428nm, 496nm, 506nm, 530nm, 1000nm; (2) on the basis of the linear relations of the gray value and the reflectivity of the single band spectra images, converting the single band spectra images of the step (1) into reflectivity images; (3) according to a formula, calculating to obtain the SPAD index of each pixel point in the reflectivity images of the tea leaves. The detection method can rapidly detect the SPAD indexes of the tea leaves in random space distribution to obtain the spatial distribution information of the SPAD indexes of the tea leaves.

Description

technical field [0001] The invention relates to the field of tea processing detection, in particular to a detection method for the SPAD index of tea leaves. Background technique [0002] The leaf SPAD index is a characteristic index reflecting the nitrogen level of plants, and has been successfully used to evaluate the nitrogen levels of many plants. [0003] Leaf SPAD index is the display index of SPAD-502 chlorophyll meter produced by Japan KONICA MINOLTA company. The chlorophyll meter evaluates the relative content of chlorophyll in leaves by measuring the absorption rate of leaves at 650nm and 940nm. When measuring, insert the leaf between the receiving window and the measuring probe, press the measuring probe, clamp the leaf between the receiving window and the measuring probe, and detect the chlorophyll content of the plant leaf by measuring the transmission spectrum of the leaf. This instrument has been widely used in Nondestructive rapid diagnosis of chlorophyll in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
Inventor 李晓丽何勇罗榴彬孙婵骏
Owner ZHEJIANG UNIV
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