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NNI (nitrogen nutrition index) estimation method and device

An estimation device and nitrogen nutrition technology, applied in the measurement of color/spectral characteristics, etc., can solve problems such as complex errors, and achieve the effects of fast and accurate estimation, simple structure, and convenient calculation.

Inactive Publication Date: 2017-11-24
FARMLAND IRRIGATION RES INST CHINESE ACAD OF AGRI SCI
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Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method and device for estimating the nitrogen nutrition index. The selected target spectral index has a simple structure and is easy to calculate, which greatly overcomes the process of predicting the nitrogen nutrition index. Problems that are too complex and have large errors can quickly and accurately estimate the nitrogen nutrition index of summer maize

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  • NNI (nitrogen nutrition index) estimation method and device
  • NNI (nitrogen nutrition index) estimation method and device
  • NNI (nitrogen nutrition index) estimation method and device

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Embodiment Construction

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0041] Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0042] It should be not...

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Abstract

An embodiment of the invention provides an NNI (nitrogen nutrition index) estimation method and device. The method comprises the following steps: initial data, including canopy spectral reflectance, above-ground plant biomass and above-ground plant nitrogen concentration at each sampling point, of summer maize is obtained; the NNI of each sampling point is calculated according to the initial data; fitting coefficients for a normalized spectral index and the NNIs are calculated through a plurality of default fitting functions respectively, wherein the default fitting functions comprise a power function, a linear function, an exponential function and a logarithmic function, and the normalized spectral index is obtained by combining any two wave bands in a default spectral band range; a target spectral index and a target fitting function corresponding to the maximum fitting coefficient obtained through calculation are selected; an NNI estimation model is generated according to the target spectral index and the target fitting function. The NNIs of the summer maize can be estimated rapidly and precisely.

Description

technical field [0001] The invention relates to the field of crop nutrition diagnosis, in particular to a method and device for estimating nitrogen nutrition index. Background technique [0002] The Nitrogen Nutrition Index (NNI) can comprehensively reflect the nitrogen nutrition status of crops. The traditional NNI calculation method requires destructive sampling in the field, but this method is time-consuming and laborious, and the process of nitrogen nutrition diagnosis during crop growth has a hysteresis, which is not conducive to practical application in the field environment. [0003] At present, hyperspectral remote sensing is gradually becoming the main means of farmland information acquisition due to its unique information acquisition advantages (short time, high efficiency, macroscopic integration, and high degree of automation). Invert plant biomass and aboveground nitrogen concentration to indirectly estimate NNI. However, this method needs to select multiple s...

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 赵犇段爱旺肖俊夫刘战东刘祖贵秦安振宁东峰赵鹏利
Owner FARMLAND IRRIGATION RES INST CHINESE ACAD OF AGRI SCI
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