System for diagnosing nitrogen nutrient condition of rice canopy

Abstract

The invention discloses a system for diagnosing the nitrogen nutrient condition of a rice canopy. The system comprises a bracket, an image identifying unit and a central control unit, wherein the bracket is used for fixing an image collecting part; the image identifying unit is used for identifying green leaves in an image, and quantizing the leaf color value of the green bladesleaves; the centralcontrol unit is used for calculating the porosity and canopy leaf area index according to the image element distribution of the green leaves, and calculating the nitrogen condition value of the leaves according to the leaf color value; the class of the nitrogen nutrient condition of the rice canopy is diagnosed according to the canopy leaf area index and leaf nitrogen value. The system has the advantages that the green leaf image element is identified according to the color difference between the leaves and soil background, so as to calculate the canopy porosity and leaf color value; the leafarea index is calculated according to an empirical formula of porosity and leaf area index, and the nitrogen value is estimated according to an empirical relationship of the leaf color value and thenitrogen condition; then, the leaf area index is multiplied by the nitrogen value to obtain the nitrogen value of the rice canopy; the nitrogen nutrient condition can be simply, quickly and quantitatively diagnosed under the farmland condition.

Description

Technical field [0001] The invention relates to the technical field of rice canopy parameter measurement, in particular to a system for diagnosing the nitrogen nutrition status of the rice canopy. Background technique [0002] Nitrogen is an important element of photosynthesis of green plants. Under natural conditions, there is a widespread lack of nitrogen in the soil. Using nitrogen fertilizers in farmland to supplement crop nitrogen nutrition can significantly improve crop photosynthetic efficiency. However, when the nitrogen application exceeds a certain amount, some negative effects will appear, causing agricultural non-point source pollution. Diagnosing crop nitrogen nutrition status and rational application of nitrogen fertilizer are of great significance to agricultural production and ecological environment protection. Parameters such as leaf area index and leaf nitrogen content value are important basis for diagnosing crop nitrogen nutrition status and growth requireme...

AI Technical Summary

Problems solved by technology

The technology of measuring leaf area index based on canopy pictures taken by cameras can be carried out with ordinary digital cameras, which is portable and low-cost. However, this method currently requires special computer software to process pictures and calculate and analyze, and it is difficult to promote and use among farmers.

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