|What is Hydroponics||
Hydroponics is defined as growing plants without soil. This production system may use a wide variety of organic and inorganic materials. The nutrient solution, rather than the media in which the plants are growing, always supplies most of the plant nutrient requirements. This method of growing has also been referred to as nutrient-solution culture, soil less culture, water culture, gravel culture and nutriculture.
|Types of hydroponics cultivation||
Liquid (Non-Aggregate) Hydroponics Systems:
In this system, no rigid supporting medium for the plant roots is used.
Liquid systems are, by their nature, closed systems; the plant roots are
exposed to the nutrient solution, without any type of growing medium, and
the solution is recirculated and reused.
Nutrient Film Technique (NFT): The principle of the NFT system is to provide a thin film of nutrient solution that flows through either black or white-on-black polyethylene film liners supported on wooden channels or some form of PVC piping which contains the plant roots. The walls of the polyethylene film liners are flexible, permitting them to be drawn together around the base of each plant, which excludes light and prevents evaporation.
Bag Culture: In bag culture, the growing mix is placed in plastic bags in lines on the greenhouse floor. The bags may be used for at least two years, and are much easier and less costly to steam-sterilize than soil.
|Advantages of Hydroponics||
|Limitations of Hydroponics||
|References||Science tech Entrepreneur, January 2007|