Hydroponics is a form of agriculture in which you use no soil. You use water hence the name HYDROponics. For this particular project we will be using a Ebb and Flow system and will be growing lettuce inside a month. The plant is placed on a tray in water and a bell pump system which flushes nutrients into the plant and gradually sinks back under the tray. This system is highly efficient for small plants.
credit: http://home.howstuffworks.com/lawn-garden/professional-landscaping/alternative-methods/hydroponics3.htm
If you want further information on how this system works here is a diagram:
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