Method for monitoring wheat plant water content under different plant nitrogen content levels

A technology for plant nitrogen content and water content, which is applied in measurement devices, color/spectral characteristic measurement, chemical analysis by titration, etc.

A technology for plant nitrogen content and water content, which is applied in measurement devices, color/spectral characteristic measurement, chemical analysis by titration, etc.

CN103472009AActive Publication Date: 2013-12-25NANJING AGRICULTURAL UNIVERSITY
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  • Method for monitoring wheat plant water content under different plant nitrogen content levels
  • Method for monitoring wheat plant water content under different plant nitrogen content levels
  • Method for monitoring wheat plant water content under different plant nitrogen content levels

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Embodiment Construction

[0032] The present invention investigates the application of the optimal spectral index in the PWC core band common area based on hyperspectral technology at different PNC levels by implementing two wheat experiments in different years, different nitrogen application levels and different water treatment interactions, combined with the accompanying drawings Advantage.

[0033] Such as Figure 5 Shown, the monitoring method of moisture content of wheat plants under different plant nitrogen content levels, comprises the following steps:

[0034] S101: Sampling, collecting wheat canopy spectral reflectance, PNC and PWC values; sample points are collected from different growth stages, different water treatments, different nitrogen levels and different years;

[0035] S102: divide PWC and canopy spectral reflectance data into three sub-data sets according to different PNC levels;

[0036] S103: Obtain the coefficient of determination (R 2 ) result set;

[0037] S104: Determine t...

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Abstract

The invention belongs to the field of crop growth monitoring, and discloses a method for monitoring the wheat plant water content (PWC) under different plant nitrogen content (PNC) levels. The method comprises the following steps: combining wheat canopy blade reflectance spectroscopic data with PWC data, carrying out classification according to different PNC size levels, determining a core waveband common region under different PNC levels, constructing an optimum spectral index based on the core waveband common region, and establishing a general monitoring model of the wheat plant water content on the basis of the optimum spectral index. According to the invention, the influence of low, medium and high nitrogen nutrition conditions to PWC monitoring is fully considered, the selected optimal spectral index is suitable for wheat PWC high-spectrum monitoring under multiple kinds of nitrogen nutritions, and the wheat PWC under different water nitrogen conditions can be rapidly and accurately estimated without loss. The method provides important technical support for high-spectrum monitoring on the wheat plant water content under different nitrogen nutrition conditions in the precision agriculture.

Description

technical field [0001] The invention belongs to the field of crop growth monitoring, and relates to a method for monitoring moisture content of wheat plants at different plant nitrogen content levels, in particular to a method based on hyperspectral technology to determine the maximum common area of ​​the core band of wheat plant moisture content at different plant nitrogen content levels. The optimal spectral index and the method of establishing a wheat PWC monitoring model based on the optimal spectral index are especially suitable for hyperspectral monitoring research of wheat plant moisture content under different nitrogen nutrition levels. Background technique [0002] Based on hyperspectral remote sensing technology, real-time monitoring and rapid diagnosis of crop water status can be realized, which is of great significance for improving crop irrigation management level and water use efficiency. [0003] Plant water content (PWC) can fully reflect the water demand inf...

Claims

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Application Information

Patent Timeline
25 Dec 2013
Publication
CN103472009A
IPC
G01N21/25; G01N31/16; G01N5/00
CPC
Y02A40/10
Inventors
朱艳; 姚霞