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A quantitative relationship is shown to exist between the chlorophyll content of soybean and Valencia orange leaves and their percentage reflectance of light of wavelength 625 mmicro as measured by a colorimeter with reflectance attachment.

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During the past decade, many investigators have studied the uptake of micronutrients when supplied as chelates to plant roots. Considerable controversy has arisen as to whether the metal is dissociated from the organic ligand at the root membrane and is taken up by itself, or whether the entire chelate is absorbed through the root nmembrane. Several