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Unformatted text preview: water involved in physiological process (transpiration, photosynthesis) The evaporation of plant water primarily from leaves ( transpiration) serves to cool the surface of leaves, thereby reducing heat stress from high levels of heat energy absorbed by plants All water supplied to the soil or medium in the plant container is not available to be taken up by the roots and used by the plant: gravity draws some through drainage holes soil/medium particles bind tightly to water, rendering water unavailable for absorption Minerals ( soluble salts ) in the soil or medium from fertilizers and from tap water attract water and hold it tightly, making it unavailable to the plant Water Quality Chlorination Fluoridation Soft water calcium replaced by sodium Hard water high level of calcium....
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- Spring '08