Chlorine—A Micronutrient Element for Higher Plants

Abstract

room temperature for the major changes in starch and organic acids to occur is rather closely adapted to the period of the normal diurnal variation in illumination.The range through which the concentration of these components may move in response to the diurnal alteration of light and darkness is moderately constant for any given lot of leaves and at ordinary tempera- ture is not increased by prolonged exposure either to light or to darkness.