What is hydroponics?

Answer Posted / suryakant

Hydroponics is a techniques for growing plants without soil.
It uses an inert medium (peat, sand, vermiculite, etc) and
adding a solution containing all the essential nutrients
required for plant normal growth. A purer form of
hydroponics, water culture, involves having plant roots
water containing nutrients. Their crowns are supported in a
thin layer of inert medium. Hydroponics is also known as
'soilless culture'.

Hydroponic techniques are well suited to roof gardens. The
advantages are:

roof gardens are easy to service, with water and electricity
a hydroponic tank can weigh less a soil-filled planter
the water supply can be automated
there is no need to mix composts
Soil is a growing medium, but it is not necessary one. Inert
substances like perlite or vermiculite can also serve as
growing mediums (as they do in hydroponics). What is
necessary are the nutrients the soil or perlite contains. In
hydroponic systems, a specially formulated, nutrient rich
solution, containing all the necessary macro- and
micronutrients necessary for healthy plants, is pumped
through an inert medium. The systems are typically installed
in a greenhouse or other controlled environment so that it
can be carefully monitored. Hydroponics is considered a
science and is highly specialized, but can, however, be
successfully practiced by hobbyists.

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