Hydroponics is a method for growing plants in which roots are suspended in a nutrient solution consisting of water and fertilizers. An artificial medium, such as sand, gravel, perlite, peat moss, or sawdust, may or may not be used. Liquid hydroponic systems have no supporting medium for the plant’s roots, while aggregate systems have a solid medium of support. Hydroponic systems can be further categorized as open, where the nutrient solution is not reused, and closed, where the nutrient solution is recycled.
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