A rice plant total-nitrogen estimation method based on a canopy structure and a canopy spectrum

A canopy structure and rice technology, which is applied in the field of rice plant total nitrogen rapid measurement, can solve the problems of destructiveness and poor timeliness, and achieve the effect of good prediction ability and stable model

Inactive Publication Date: 2019-01-01
NORTHEAST AGRICULTURAL UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem of destructive and poor timeliness of the existing laboratory ric...

Method used

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  • A rice plant total-nitrogen estimation method based on a canopy structure and a canopy spectrum
  • A rice plant total-nitrogen estimation method based on a canopy structure and a canopy spectrum
  • A rice plant total-nitrogen estimation method based on a canopy structure and a canopy spectrum

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specific Embodiment approach 1

[0017] Specific implementation mode one: the method for estimating the total nitrogen of rice plants based on canopy structure and canopy spectrum in this embodiment is carried out according to the following steps:

[0018] Step 1: After rice transplanting, tillering stage, and jointing and booting stage, measure the canopy spectrum of rice with different nitrogen fertilizer levels, collect 6 spectral curves for each different nitrogen fertilizer level, and perform arithmetic average on the 6 spectral curves to obtain different nitrogen fertilizer levels. Actual reflectance spectrum data of rice under nitrogen level;

[0019] Step 2: Collecting rice plant samples at corresponding periods after rice transplanting, tillering stage, and jointing and booting stage, measuring the plant height of the rice samples and determining the number of stems of each sample, and then measuring the total nitrogen content of the rice plants;

[0020] Step 3: Use the 9-point weighted moving avera...

specific Embodiment approach 2

[0033] Specific implementation mode two: the method for estimating the total nitrogen of rice plants based on canopy structure and canopy spectrum in this embodiment is carried out according to the following steps:

[0034] Step 1: Spectral measurement of rice canopy

[0035] After transplanting, tillering stage and jointing and booting stage of two varieties of rice (rice types Songjing 9 and Daohuaxiang), the canopy spectra of rice with different nitrogen levels were measured, and 6 spectral curves were collected for each nitrogen level. Arithmetic average of 6 spectral curves and 6 spectral curves were used to obtain the actual reflectance spectral data of rice under different levels of nitrogen application, and a total of 36 sets of data were obtained;

[0036] Step 2: Collection of rice canopy structure parameters and determination of nitrogen content

[0037] Collect rice plant samples at corresponding periods after rice transplanting, tillering stage, and jointing and ...

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Abstract

The invention belongs to the technical field of rice plant total-nitrogen measurement, relates to a method for rapid measurement of rice plant total nitrogen, and particularly relates to a rice planttotal-nitrogen estimation method based on a canopy structure and a canopy spectrum. The objective of the method is to overcome a technical problem that experimental rice plant total-nitrogen testing methods at present are destructive and poor in timeliness. The method includes rice canopy spectrum measurement, rice canopy structure parameter collection, nitrogen content measurement, data processing, construction of a normalized differential vegetation index NDVI, building of a model that is the production of the rice plant total-nitrogen content, the rice plant height and the number of rice plant stems is equal to 0.6998e<4.0599NDVI>, and calculation of the plant total-nitrogen content of rice to be measured according to the NDVI of the rice to be measured, the corresponding rice plant height and the number of rice plant stems. The method utilizes the relationship between the vegetation index and the plant total nitrogen content to achieve rapid measurement of the plant total nitrogencontent.

Description

technical field [0001] The invention relates to a method for quickly measuring total nitrogen of rice plants, belonging to the technical field of total nitrogen measurement of rice plants. Background technique [0002] Nitrogen is an important factor affecting rice growth and development, yield and quality. If nitrogen fertilizer is used too little, crops cannot grow healthily, and it is difficult to ensure crop yield and quality. Excessive use of nitrogen fertilizers can easily cause farmland pollution and degrade soil quality. Determining the appropriate nitrogen content of crops is a key link in evaluating crop growth and regulating crop topdressing. This requires accurate, rapid and real-time monitoring of crop nitrogen status during crop production to achieve on-demand fertilization and precise management. Therefore, it is very meaningful to monitor the nitrogen content of rice in order to apply nitrogen fertilizer reasonably and accurately. [0003] Traditional nut...

Claims

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Application Information

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IPC IPC(8): G01N33/00
CPCG01N33/0098
Inventor 张新乐于滋洋张忠臣刘焕军李厚萱
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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