Establishment method of spectral monitoring model of nitrogen content in winter wheat during the whole growth period
A spectral monitoring and model building technology, applied in the field of agricultural planting, can solve problems such as differences in simulation accuracy, further verification, increased background and noise interference, etc.
Active Publication Date: 2021-06-01
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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In order to facilitate the operation, relevant scholars have also carried out comparative studies on the simulation effects of various models at different growth stages, and finally proposed a spectral monitoring model suitable for plant nitrogen content in the whole growth period, but the simulation accuracy of the full growth period model is different from the applicable It is beneficial to the application and popularization of this model until further verification is needed; due to the influence of factors such as plant physiological structure and growth characteristics indicators at different growth stages, the spectral reflectance of different growth periods also changes accordingly, and a specific full-growth period spectral monitoring model is used. There are large differences in the simulation accuracy of each growth period, especially for the entire growth period model monitoring accuracy needs to be improved urgently, in order to meet the development needs of crop nutrition diagnosis and growth monitoring technology
[0004] With the improvement of spectral resolution, spectral information data is enriched, but background and noise interference are also increased
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[0041] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.
[0042] The tested variety of winter wheat is Zhongmai 175. The sowing and harvesting dates of 2016-2017 winter wheat were October 6, 2016 and June 7, 2017 respectively; the sowing and harvesting dates of 2017-2018 winter wheat were October 13, 2017, respectively. Day, June 6, 2018. The test set up 15 plots in total, which were divided into 5 nitrogen fertilizer treatments. Fertilization was applied twice during the whole gr...
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The invention discloses a method for establishing a spectral monitoring model of winter wheat nitrogen content in the whole growth period. According to the data of winter wheat canopy spectral reflectance and plant canopy nitrogen content in different growth stages under different nitrogen application levels, the correlation between spectral information basic transformation and "trilateral" parameter to plant canopy nitrogen content, the present invention proposes Considering the characteristics of each growth period and a combination of suitable models with high precision, and constructing a principal component estimation model of plant canopy nitrogen content that integrates spectral information basic transformation and "trilateral" parameters and many other independent variables, breaking through the spectral monitoring The influence of growth period constraints and other background noises provides theoretical basis and technical support for accurate hyperspectral diagnosis of nitrogen content in winter wheat canopy during the whole growth period.
Description
technical field [0001] The invention relates to the technical field of agricultural planting, in particular to a method for establishing a spectral monitoring model of winter wheat nitrogen content during the whole growth period. Background technique [0002] Nitrogen is the main nutrient element of wheat, and it has an extremely important impact on the life activities of wheat and the yield and quality of wheat; therefore, large-scale real-time monitoring of nitrogen fertilizer status of crops is crucial to improving the quality of winter wheat and sustainable use of land, ensuring that crops Improving quality and efficiency has important theoretical and practical significance. Plant nitrogen deficiency caused changes in physiological and biochemical characteristics of winter wheat and differences in plant canopy spectral characteristics, making it possible to monitor nitrogen content in plant canopies using spectral technology. Compared with the traditional destructive sa...
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IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 彭致功林少喆张宝忠陈鹤魏征蔡甲冰刘露韩娜娜张倩
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES