greenhouse

a building with glass walls and roof

for the cultivation and exhibition of plants under controlled conditions of or relating to or caused by the greenhouse effect

"greenhouse gases"

.]]A greenhouse (also called a glasshouse or hothouse) is a building where plants are cultivated. A greenhouse is built of glass or plastic; it heats up because the sun's incoming electromagnetic radiation warms plants, soil, and other things inside the building. Air warmed by the heat from hot interior surfaces is retained in the building by the roof and wall. The glass used for a greenhouse works as a selective transmission medium for different spectral frequencies, and its effect is to trap energy within the greenhouse, which heats both the plants and the ground inside it. This warms the air near the ground, and this air is prevented from rising and flowing away. This can be demonstrated by opening a small window near the roof of a greenhouse: the temperature drops considerably. This principle is the basis of the autovent automatic cooling system. Greenhouses thus work by trapping electromagnetic radiation and preventing ''convection''. See Solar greenhouse (technical) for a more technical discussion of solar greenhouse workings.Greenhouses are often used for growing floricultureflowers, vegetables, fruits, and tobacco plants. Bumblebees are the pollinators of choice for most greenhouse pollination, although other types of bees have been used, as well as artificial pollination. )]]Besides tobacco, many vegetables and flowers are grown in greenhouses in late winter and early spring, then transplanted outside as the weather warms. Started plants are usually available for gardeners in farmers markets at transplanting time.The closed environment of a greenhouse has its own unique requirements, compared with outdoor production. Pests and diseases, and extremes of heat and humidity, have to be controlled, and irrigation is necessary to provide water. Significant inputs of heat and light may be required, particularly with winter production of warm-weather vegetables. Special greenhouse varieties of certain crops, like tomatoes, are generally used for commercial production. Greenhouses are increasingly important in the food supply of high latitude countries. The largest greenhouse complex in the world is at Leamington, Ontario (close to Canada's most southern spot) where about 200 acres (0.8 km²) of tomatoes are entirely grown under glass.Greenhouses protect crops from too much heat or cold, shield plants from dust storms and blizzards, and help to keep out pests. Light and temperature control allows greenhouses to turn unarable land into arable land. Greenhouses can feed starving nations where crops can't survive in the harsh deserts and arctic wastes. Hydroponics can be used in greenhouses as well to make the most use of the interior space.Biologist John Todd (biologist)John Todd invented a greenhouse that turns sewage into water, through the Phytoremediationnatural processes of bacteria, plants, and animals.

See also -

Conservatory (greenhouse)

Solar greenhouse (technical)

External links -

ces.ncsu.edu - North Carolina State University Greenhouse Food Production website

attra.ncat.org - Organic Greenhouse Tomato Production

greenhousestuff.com - Greenhouse Supplies

primegreenhouse.com - Greenhouse Articles and Resources

orchidgeeks.com - Greenhouse !ForumCategory:GardeningCategor y:Buildings? and structuresar:دفيئة !زجاجيةde:Gewächshauses: Invernaderofr:Serreid:Rumah? !hijauit:Serrahe:חממהnl:Kas ja:ビニールハウスpl:Szk larniasv:Växthus

John Goldstein Photography
A professional photographer with an extensive online portfolio. Also offers fine art prints, stock imagery, and freelance work. Known for creating clear, creative, communicative imagery.
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ALLtech Research and Development
ALLtech Research and Development is a leading provider of agricultural and related research solutions in the United States. ALLtech Research and Development has dedicated a team of resources to provide our customers with innovative research technology, so that our customers can provide new chemistries and solutions that meet the challenges of today's agricultural industry.
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Advance Greenhouses
Large selection of hobby greenhouse kits in maintenance free materials. Large selection of greenhouse accessories. Free planning and building a greenhouse guide. Expert assistance from selection to installation
http://www.advancegreenhouses.com/

Screen-EZE
SCREEN-EZE is a patented fixed screen system. Screen-EZE features an aluminum base and a vinyl cap which are snapped together and attached to your screen porch. Screen-EZE can be installed on the inside, outside, or center of your porch post and rail design. Allowing you many more design options, that our competitors brands just can not match with there products. Screen-EZE is very versatile. You can use Screen-EZE with your Anderson Windows, or many other fine window brands. Our product is great for extra inside shading when you use our Solar Screen or SunSure Screen Fabrics. Multi use Screen-EZE.. New uses for our products are coming in daily. EMAIL Us today, if your in need of some great tips and wonderful design options.
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Chris's Science Page
Chris Butterworth's Science Page
http://www.chrisbutterworth.com/science/index.htm

HarvestWorks, Inc.
HarvestWorks is a not-for-profit organization with a mission to enrich and enhance the lives of individuals with disabilities.
http://www.harvestworksinc.org/

Australian Greenhouse Office (AGO)
The key Commonwealth agency on greenhouse matters, and is responsible for both the coordination of domestic climate change policy and for managing the delivery of major newand existing Commonwealth greenhouse programs.
http://www.greenhouse.gov.au/

GreenHouse Gas Online
Devoted to greenhouse gas and climate change news and science. Detailed information on the various greenhouse gases and on climate change issues. Also, contains up to date links to the abstracts of hundreds of greenhouse gas scientific papers.
http://www.GHGonline.org

IEA Greenhouse Gas R&D Programme
International Energy Agency. Introduction to climate change, information on technical solutions. Reports and a regular newsletter, details of forthcoming conferences, links to other sites.
http://www.ieagreen.org.uk/

Vision Internet Services
Statewide Tasmanian ISP. Site features a list of services, news and information, links, user home pages, downloads, and contact details.
http://www.vision.net.au/