METHOD AND DEVICE FOR DETERMINING THE RATIO BETWEEN THE CONTENTS OF CHLOROPHYLL AND OF A CHROMOPHORE COMPOUND IN A VEGETABLE TISSUE WITHOUT INDEPENDENTLY MEASURING SAID CONTENTS

摘要

A method and device for determining the ratio of the contents of chlorophyll and of a chromophorous compound that is non-fluorescent in the band of chlorophyll fluorescence in a plant tissue, without determining the contents. The method includes: emission of two excitation radiations of chlorophyll fluorescence, one of the excitation radiations being absorbed by the chromophorous compound and the other not, measurement of the fluorescence radiations induced, the fluorescence radiation induced by the excitation radiation absorbed by the chromophorous compound being measured outside of the absorption spectrum of chlorophyll and the fluorescence radiation induced by the excitation radiation not absorbed by the chromophorous compound being measured within the absorption spectrum of chlorophyll, the ratio of the contents is determined from the ratio of the measured fluorescence radiations. The method can be implemented for measuring an indicator, called NBI (Nitrogen Balance Index), of the nitrogen nutrition of plants.