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Salinity & Salinity Meters Plants need water for growth and healthy development. If plants are deprived of the required amounts of water, over a period they will whither and die. Unlike plants grown in soil, plants grown hydroponically in grow rooms and indoor greenhouses, are completely dependent on supplied water to meet their nutritional needs. It is therefore important that growers gain a basic understanding of certain vital aspects concerning water supply and plant nutrition. Air Movement in Grow Room – Some Basic Considerations Plants grow best in an environment that is well ventilated to effectively dissipate heat. All artificial light sources generate heat and grow rooms have to be therefore, provided with some means of cooling. Cooling of grow rooms is best done using blowers, with one mounted on the inside to blow hot air out, and the other mounted on the outside to blow cool air in.