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Crop canopy leaf total nitrogen content estimation method

A technology for crop canopy and nitrogen content, which is applied in measurement devices, measurement of color/spectral characteristics, and material analysis by optical means. It can solve problems such as single spectral characteristic variables and achieve good stability.

Inactive Publication Date: 2019-08-23
ANHUI UNIVERSITY
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing hyperspectral variable monitoring and evaluation of crop nutrition has a single spectral characteristic variable, and this application provides a method for estimating the total nitrogen content of crop canopy leaves

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  • Crop canopy leaf total nitrogen content estimation method

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Embodiment Construction

[0046] In order to make the technical means, creative features, goals and effects of the present invention easy to understand, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and accompanying drawings.

[0047] 1. Experiment preparation

[0048] (1) Research area:

[0049] The crops used in the embodiments of the present invention take corn leaves as an example. The experiment was carried out in the National Precision Agriculture Research Demonstration Base in 2012. The base is located in the northeast of Xiaotangshan Town, Changping District, Beijing, at latitude 40°00′~40°21′ , east longitude 116°34′~117°00′, altitude 36m. The soil type is fluvo-aquic soil. The climate type is a temperate continental monsoon climate, with cold winters, hot summers, drought and little rain all year round. The corns planted are Nongda 108 (intermediate type) and Jinghua 8 (compac...

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Abstract

The invention belongs to the technical field of spectral nondestructive detection of crop biochemical components, and discloses a crop canopy leaf total nitrogen content estimation method. The methodcomprises steps: firstly, a successive projection transformation algorithm SPA is used to construct a sensitive spectral feature data set, a position feature data set and a vegetation index feature data set; then, a sensitive spectral variable set with the minimum collinearity is selected from the sensitive spectral feature data set, the position feature data set and the vegetation index feature data set; and finally, the sensitive spectral variable set is subjected to partial least squares regression PLS modeling to obtain a crop canopy leaf total nitrogen content LNC estimation model. The model can accurately estimate the crop canopy leaf total nitrogen content, which is not much different from the measured value.

Description

technical field [0001] The invention belongs to the technical field of spectral non-destructive detection of biochemical components of crops, and in particular relates to a method for estimating the total nitrogen content of crop canopy leaves. Background technique [0002] Nitrogen is an essential element for plant photosynthesis and for diagnosing the nutritional status of crops. It is closely related to crop growth and development, growth and quality, and is also the focus of attention of agricultural experts. Under normal nitrogen application, plant nitrogen uptake, nitrogen use efficiency, crop yield and quality all increased with the increase of nitrogen application. However, if the nitrogen fertilizer is too high, it will cause problems such as degradation of soil quality, decline in rice yield and quality, and even land pollution in severe cases. At the same time, changes in the nitrogen concentration of crop leaves will affect the photosynthesis of plant leaves, re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
CPCG01N21/25G01N2021/1797
Inventor 赵晋陵范玲玲梁栋徐超黄林生洪琪张东彦翁士状
Owner ANHUI UNIVERSITY
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