METHOD FOR SYNCHRONOUSLY DIAGNOSING NITROGEN, POTASSIUM AND MAGNESIUM ELEMENT DEFICIENCY ON THE BASIS OF DISTRIBUTION CHARACTERISTICS OF LEAF CHLOROPHYLL ON LEAF SURFACE

摘要

A method for synchronously diagnosing nitrogen, potassium and magnesium element deficiency on the basis of distribution characteristics of leaf chlorophyll on the leaf surface: first, segmenting a leaf surface area of a leaf to be measured into a plurality of small areas; then, extracting regional distribution characteristics of chlorophyll, and extracting chlorophyll content mean values, chlorophyll content variances, chlorophyll content maximum values, and chlorophyll content minimum values corresponding to all pixel points in the small areas in a leaf chlorophyll leaf surface distribution diagram by using a hyperspectral image technology; constructing a nitrogen-potassium-magnesium deficiency diagnosis model on the basis; and diagnosing nitrogen, potassium and magnesium deficiency of said leaf according to the model. According to the method, the limitation that an element deficiency diagnosis method based on chlorophyll content cannot synchronously diagnose the deficiency of nitrogen, potassium and magnesium elements in cucumber leaves is overcome; the distribution characteristics of chlorophyll on the leaf surface can be rapidly extracted in a lossless mode, and the deficiency of nitrogen, potassium and magnesium elements in leaves can be efficiently diagnosed.