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Method and system for determining nitrogen content of tree leaves in fruit expansion period

A technology of fruit expansion period and nitrogen content, which is applied in the field of agricultural vegetation remote sensing, can solve the problem that the nitrogen content of tree leaves in the fruit expansion period cannot be estimated efficiently, and achieves the effect of simple calculation method, improved accuracy and fewer bands.

Active Publication Date: 2021-03-09
SOUTHWEST UNIVERSITY
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Problems solved by technology

However, the four-band hyperspectral index estimation model for leaf nitrogen content in the fruit expansion period has not been reported, and at the same time, the accurate, simple and efficient estimation of the tree leaf nitrogen content in the fruit expansion period cannot be achieved in the existing technology

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  • Method and system for determining nitrogen content of tree leaves in fruit expansion period
  • Method and system for determining nitrogen content of tree leaves in fruit expansion period
  • Method and system for determining nitrogen content of tree leaves in fruit expansion period

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Embodiment approach

[0109] As an embodiment, the spectral sampling module of the present invention specifically includes:

[0110] A sampling unit, configured to select N sampling points in the leaf samples, where N is a positive integer greater than or equal to 2.

[0111] Four sets of sensitive band spectral value determination units are configured to calculate four sets of sensitive band spectral values ​​by averaging the N sampling points.

[0112] As an embodiment, the four groups of sensitive band spectral values ​​in the present invention include: the leaf spectral value of blue light, the leaf spectral value of green light, the leaf spectral value of red light, and the leaf spectral value of long-wave infrared; wherein, the blue light The wavelength of the blue light is 420-440 nm, the wavelength of the green light is 540-560 nm, the wavelength of the blue light is 670-690 nm, and the wavelength of the blue light is 710-730 nm.

[0113] The beneficial effects of the present invention are...

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Abstract

The invention relates to a method for determining the nitrogen content of tree leaves in a fruit expansion period. The method comprises the following steps: carrying out spectral sampling on a leaf sample to obtain four groups of sensitive waveband spectral values; acquiring the nitrogen content of a leaf sample; calculating a first difference vegetation index according to a first group and a second group of the sensitive waveband spectral values; calculating a second difference vegetation index according to a third group and a fourth group of the sensitive waveband spectral values, and calculating an initial four-waveband hyperspectral index according to the first difference vegetation index and the second difference vegetation index; drawing an initial regression curve according to the initial four-waveband hyperspectral index and the nitrogen content; determining an optimal four-waveband hyperspectral index according to the initial regression curve; establishing an optimal monitoring model according to the optimal four-waveband hyperspectral index and the nitrogen content; and calculating the nitrogen content of the leaves in a detected sample according to the optimal monitoringmodel. According to the method, the number of used bands is small, a calculation method is simple and convenient, and the accuracy, convenience and high efficiency of determining the nitrogen contentof tree leaves in the fruit expanding period can be improved.

Description

technical field [0001] The invention relates to the technical field of agricultural vegetation remote sensing, in particular to a method and a system for determining the nitrogen content of tree leaves in the fruit expansion period. Background technique [0002] In each phenological period of the interannual growth and development of fruit trees, the fruit enlargement period is the dividing point between vegetative growth and reproductive growth of the tree, which marks the transition of fruit trees from vegetative growth to reproductive growth. Since this period is an important period for the formation of fruit tree yield and quality in that year, the quality of its production management can directly affect the economic benefits of fruit farmers in that year. Therefore, in production, in order to increase yield, farmers often blindly and repeatedly over-apply nitrogen fertilizer (commonly known as "fruit fertilizer") during the fruit expansion period in order to obtain high...

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Application Information

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IPC IPC(8): G01N21/31G01N21/3563G01N21/359G01N21/01
CPCG01N21/01G01N21/31G01N21/3563G01N21/359
Inventor 王洁张跃强石孝均易时来吕强
Owner SOUTHWEST UNIVERSITY
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