Editing Hydroponics (section)

===Static solution culture===
[[File:CDC South Aquaponics Raft Tank 1 2010-07-17.jpg|thumb|The deep water raft tank at the Crop Diversification Centre (CDC) South [[Aquaponics]] greenhouse in [[Brooks, Alberta]]]]
In static solution culture, plants are grown in containers of nutrient solution, such as glass [[Mason jar]]s (typically, in-home applications), [[Flowerpot|pots]], buckets, tubs, or tanks. The solution is usually gently aerated but may be un-aerated.<ref name=":-3" /> If un-aerated, the solution level is kept low enough that enough roots are above the solution so they get adequate oxygen. A hole is cut (or drilled) in the top of the reservoir for each plant; if it is a jar or tub, it may be its lid, but otherwise, cardboard, foil, paper, wood or metal may be put on top. A single reservoir can be dedicated to a single plant, or to various plants. Reservoir size can be increased as plant size increases. A home-made system can be constructed from food containers or glass canning jars with [[aeration]] provided by an aquarium pump, aquarium airline tubing, aquarium valves or even a [[biofilm]] of [[green algae]] on the glass, through [[photosynthesis]]. Clear containers can also be covered with aluminium foil, butcher paper, black plastic, or other material to eliminate the effects of negative [[phototropism]]. The nutrient solution is changed either on a schedule, such as once per week, or when the concentration drops below a certain level as determined with an [[EC meter|electrical conductivity meter]]. Whenever the solution is depleted below a certain level, either water or fresh nutrient solution is added. A [[Mariotte's bottle]], or a float valve, can be used to automatically maintain the solution level. In raft solution culture, plants are placed in a sheet of buoyant plastic that is floated on the surface of the nutrient solution. That way, the solution level never drops below the roots.<ref name="Suryawanshi Hydroponic Cultivation"/>