ASSIGNMENT
PROTECTED CULTIVATION
2022-23
NATURALLY VENTILATED
POLYHOUSE
Submitted to: Dr. Kailash Sati
Submitted by: Gaurav Chaudhary (33)
Ishika Gupta (38)
Kartikey Saraswat (40)
Komal Tiwari (42)
Manish Kumar (46)
NATURALLY VENTILATED
POLYHOUSE
What is a greenhouse?
Any structure which works on greenhouse gases principle is
known as as greenhouse.
What is a Naturally ventilated polyhouse?
These polyhouses do not have any environmental control
system except for the provision of adequate ventilation and
fogger system to prevent basically the damage from weather
aberrations and other natural agents.
Compare to shade net house, Naturally Ventilated Poly House
has a plastic roof made from UV stabilized covering materials
of Polyethylene film which protect from direct rainwater and
cold in winter with air ventilation.
Naturally Ventilated Polyhouse is suitable for the cultivation of
flowers like Dutch-roses, gerbera, carnation, anthurium and
exotic vegetables like broccoli, coloured capsicum, cherry
tomato, cucumber and medicinal plants.
Naturally Ventilated polyhouse structure mostly use in India, in
crop Vegetables as like cucumber, capsicum and tomato and
floriculture, this is the most basic and traditional type of
polyhouse. In this type, there is very minimal control of
climatic change. Your plants and crops are mainly at the mercy
of the climatic conditions prevailing outside. Although there
are a few helping aids like foggier, drip irrigation
system, ventilation control polyhouse, and pest control
system, they are still not enough to yield off-season crops.
polyhouse cost 844 Rs. Per square meter in 1 acre polyhouse
cost 33,76,000 Rs. Natural ventilated polyhouse top side one
meter ventilation for polyhouse to hot air outside in polyhouse.
Principle of naturally ventilated polyhouse
The main principle on which naturally ventilated polyhouse
works is, movement of hot air is downward to upward direction
and replacement of this space occurs due to the movement of
hot air is done by cool air.
In this type of polyhouse, rolling system of polyethylene sheet
is used. Also, insect proof net is used to check the entry of
insects when polythene sheet is rolled upwards and provide the
favourable environment for crop cultivation.
Advantages of naturally ventilated polyhouse

Can grow crops throughout the year and will not have to
wait for any particular season.

There are less pests and insects in a polyhouse.

External climate will not have any impact of the growth
of crops.

Quality of produce is obviously higher in polyhouse.

Good drainage and aeration

Propagation of Ornamental Crops can also be done
effortlessly in a polyhouse.

It also increases yield for about 5 to 10 times.

Less cropping period

Fertilizer application is easier and is controlled
automatically with the help of drip irrigation.
Cost of construction (per acre)
Naturally ventilated polyhouse cost in 1 acre is around 32
lakh and after 50 % subsidy by the central government, it
reduces to 16 lakhs. After adding around Rs 1 lakh for some
miscellaneous charges it becomes Rs 17 lakh yes this is the
figure that you have to pay for 1-acre natural ventilated
polyhouse. Hence, we can say the cost of 1-acre natural
ventilated polyhouse is Rs 17 lakh
The polyhouse does not demand for extra charges till 4 years
but after 4 years you should change the entire polythene of the
polyhouse because the anti-property of the polyethene dies
after 3.5 to 4 years.
Components of Naturally Ventilated Polyhouse