Answer / 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.

Answer / john mathew

Hydroponics is a method of growing plants using mineral
nutrient solutions, in water, without soil. Terrestrial
plants may be grown with their roots in the mineral
nutrient solution only or in an inert medium, such as
perlite, gravel, mineral wool, or coconut husk.Some of the
reasons why hydroponics is being adapted around the world
for food production are the following:

No soil is needed
The water stays in the system and can be reused- thus,
lower water costs
It is possible to control the nutrition levels in their
entirety- thus, lower nutrition costs
No nutrition pollution is released into the environment
because of the controlled system
Stable and high yields
Pests and diseases are easier to get rid of than in soil
because of the container's mobility
Today, hydroponics is an established branch of agronomy.
Progress has been rapid, and results obtained in various
countries have proved it to be thoroughly practical and to
have very definite advantages over conventional methods of
horticulture. The two chief merits of the soil-less
cultivation of plants are, first, much higher crop yields,
and second, hydroponics can be used in places where in-
ground agriculture or gardening is not possible.

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