Automatic recognizing method and device for nitrogen phosphorus and potassium stress of protected tomatoes

Abstract

The invention relates to an automatic recognizing method and device for nitrogen phosphorus and potassium stress of protected tomatoes. The automatic recognizing device consists of a CCD (charge coupled device), a spectrograph, an optical system, a light source, a displacement platform, a controller, a PC (personal computer), a display and a light box. The method comprises the following steps of: firstly, performing system experiment calibration on the automatic recognizing device by a calibrating sample; then sampling a model sample during a whole growth period at equal time intervals, and collecting the reflection intensity, the polarization distribution and hyper spectrum image information of visible light-near infrared of inverted-7-shaped leaves of the tomatoes; analyzing and acquiring a main ingredient image of a nutrition stress sample according to main ingredients by combining with a measured value of chemical nitrogen phosphorus and potassium analysis and a micro structure scanning electron microscope test of the model sample, thus determining the characteristic wavelength of nitrogen phosphorus and potassium; and classifying nutrition stress characteristics into three types including a polarization characteristic, an intensity characteristic and an image characteristic, establishing the characteristic space of the nutrition stress characteristics, and establishing an automatic recognizing and comprehensive evaluation model for nitrogen phosphorus and potassium of the tomatoes according to a D-S (Dempster / Shafer) criterion theory, thus automatically recognizing and diagnosing the nitrogen phosphorus and potassium stress types of the protected tomatoes.

Description

technical field [0001] The invention relates to an automatic identification and nondestructive detection method and device for facility tomato nitrogen, phosphorus and potassium stress, in particular to a rapid automatic identification and nondestructive detection method and device for facility crop nitrogen, phosphorus and potassium stress based on multi-source light information technology. Background technique [0002] At present, the area of ​​protected gardening in my country has exceeded 3.3 million hectares, ranking first in the world, and has played a huge role in promoting the rural economy. However, due to its large output, large amount of fertilizer, high consumption of soil fertility, and the use of soilless cultivation in many areas, the proportion of nitrogen, phosphorus, potassium and other main nutrients often appear in facility cultivation and symptoms of deficiency, directly affect crop yield and quality. At the same time, in order to avoid the occurrence o...

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