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[[Image:Polytunnel Balhungie.jpg|right|thumb|250px|Polytunnels on Balhungie Farm, [[Angus]]]]
{{Merge|Polyhouse|date=August 2009}}▼
{{Merge|Hoop house|date=May 2012}}
A '''polytunnel''' is a tunnel made of [[polyethylene]] used to grow [[plant]]s that require a higher temperature and/or humidity than that which is available in the environment.
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Polytunnels have had a significant effect on the production of [[strawberries]] in the [[United Kingdom]]. Other soft fruits such as [[Raspberry|raspberries]] and [[blackberries]] are also cultivated in the same way.
'''Polyhouse''' is a protective shade made up of [[polythene]] used for growing high value agricultural products.
It is semi-circular, square or elongated in shape. [[Temperature]], [[humidity]], [[ventilation (architecture)|ventilation]] of air are controlled by the equipments fixed in the polyhouse.
Crops grown in the polyhouse are protected from intense heat, bright sunlight, strong winds, [[hail]]stones and [[cold wave|cold waves]]. Polyhouses are used in [[floriculture]] and nurseries.
Besides from this polyhouses are also used for horticulture, though the primary and best is floriculture when considering the investment. A prime example would be the ability to grow vegetables/fruits when its usually off season. In a place like India, the inability to grow tomato during rainy season allows its price to soar during the monsoon. This is spotted as an ideal time to grow tomato in poly houses. This is because the poly house is designed in such a way to provide ideal climate to the crop of your choice. Every factor influencing a crop can be controlled in a poly house. For eg. If you have your poly house in a tropical zone, temperatures are prone to soar above all normal levels. In such cases, foggers/misters are used to reduce the temperature. This does not enhance the humidity levels in the poly house as the evaporated droplets are almost immediately ventilated to open air. High tech poly houses even have heating systems as well as soil heating systems to purify the soil of unwanted viruses, bacteria etc.The recent Indo-Israel collaboration at Gharunda, near karnal is excellent example of the Polyhouse farming taking place in a developing country.
[[Category:Greenhouses]]
[[Category:Portable buildings and shelters]]
{{horticulture-stub}}
[[hi:पॉलीघर]]
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