Of all the soilless methods, water culture, by denition, is true hydroponics. Water culture includes aeroponics. In aeroponic sysems, plant roots are suspended into a closed dark chamber in which jets of nutrient solution are periodically sprayed over them to maintain 100% relative humidity. In water culture, plant roots are suspended in a liquid medium (nutrient solution), while their crowns are supported in a Styrofoam insulation cover as in the case of raft culture or by a plastic cover as in the case of nutrient lm technique (NFT). NFT is a form of water culture in which plant roots are contained in a relatively small channel through which a thin “lm” of solution passes.