Construction method for summer corn nitrogen content monitoring model based on canopy spectrum information

A technology of spectral information and construction method, which is applied in the construction field of monitoring model of nitrogen content in the whole growth period of summer maize, can solve the problems of different models, and achieve the effect of improving reliability and enriching sample data

CN109187441AActive Publication Date: 2019-01-11CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-01-11

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Abstract

The invention discloses a construction method for summer corn nitrogen content monitoring model based on canopy spectrum information. According to the method, four kinds of summer corn nitrogen content monitoring models are constructed by taking original spectral reflectivity and first derivative spectrum most sensitive band, an optimal band combination and optimal spectrum index as basis by performing test analysis on the change characteristics of summer corn plant canopy spectral reflectivity in different fertilizing levels by a mini lysimeter, researching the response relation between the summer corn plant canopy spectral reflectivity and a first derivative and nitrogen content thereof, screening a sensitive band for corn canopy nitrogen content monitoring, and determining an optimal band combination is determined, and meanwhile, screening optimal spectral index; the four kinds of summer corn nitrogen content monitoring models are calibrated by model evaluation index, and verification is performed by using field plot test data, so as to confirm an optimal monitoring model. The monitoring model can be used for monitoring the nitrogen content of summer corn in the whole growth period, and has important theoretical and practical meaning for realizing large-scale crop nitrogen content non-destructive monitoring and precise water and fertilizer management.
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Description

technical field

[0001] The invention belongs to the field of agricultural technology, and in particular relates to a method for constructing a monitoring model of nitrogen content in the whole growth period of summer maize based on canopy spectral information. Background technique

[0002] Maize is a widely planted food crop, and nitrogen fertilizer is one of the main limiting factors affecting the growth of maize, and plays an important role in the formation of its population growth, yield and quality. The adverse effects are also becoming more and more significant. Therefore, it is of great significance to quickly and effectively track and monitor the nitrogen fertilizer status of crops and rationally apply nitrogen fertilizer to improve the quality of corn and the sustainable use of land. The difference in spectral characteristics of crops due to different nitrogen content has been confirmed by many studies. Compared with the traditional destructive sampling method of mon...

Examples

Embodiment Construction

[0042] Such as figure 1 As shown, a method for constructing a summer maize nitrogen content monitoring model based on canopy spectral information includes the following steps:

[0043] S1. Measure the original spectral reflectance and nitrogen content of the summer maize canopy in different growth periods under different nitrogen nutrition;

[0044] Among them, the method for measuring the original spectral reflectance of the summer maize canopy is as follows:

[0045] The original spectral reflectance of the canopy during the growth period of summer maize is monitored by a spectrometer. During the monitoring process, standard whiteboard calibration is performed, and the spectral reflectance of several summer maize plants in each small lysimeter is monitored. The arithmetic mean value of is used as the original spectral reflectance of the summer corn canopy of this small-scale lysimeter;

[0046] The monitoring parameters of the original spectral reflectance of the summer ma...