DEFINITION OF HYDROPONICS 

•  Hydroponics is a subset of hydroculture and is a method of growing plants using mineral nutrient solutions, in water, without soil.

•  The word hydroponics technically means working water, stemming from the Latin words "hydro" meaning water, and "ponos" meaning labor.

•  Two types of hydroponics, solution culture and medium culture.

•  Solution culture types (only solution for roots)
      Continuous flow solution culture, Nutrient Film Technique (Dr Alan Cooper, 1960’s)
      Aeroponics

•  Medium culture types (solid medium for roots, sub- or top irrigated, and in a container) 

  •  Ebb and Flow (or flood and drain) sub-irrigation
      Passive sub-irrigation, inert porous medium transports water and nutrients by capillary action. Pot sits in shallow solution or on a capillary mat saturated with nutrient solution. 

    •  Deep water culture, plant contained in a net pot suspended from lid and roots suspended in nutrient solution 

    •  Run to waste