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With traditional plastic greenhouse coverings having an R-value of around 2, a great amount of money is therefore spent to continually replace the heat lost. Most greenhouses, when supplemental heat is needed use natural gas or electric furnaces. Passive heating methods exist which seek heat using low energy input.
The area of greenhouse cover is still increasing at a fast rate, during the last decade it is estimated that it has been growing by 20% every year. Areas such as the Middle East and Africa are growing in their use of plastic greenhouses by 15-20% per year, compared to the weak growth in more developed and economically stable areas such as Europe.
Green houses, window replacements, shower enclosures, partitions, light covers, patio covers, carports, and windbreaks are all modern applications for twin-wall. [16] In greenhouse construction, twin-wall polycarbonate's flexibility, transparency, and insulation support horticultural success. It adapts to tough conditions and maintains stable ...
Such coverings range from plastic mulch film, row coverings, high and low tunnels (polytunnels), to plastic greenhouses. Plastic used in agriculture was expected to include 6.7 million tons of plastic in 2019 or 2% of global plastic production. [19] Plastic used in agriculture is hard to recycle because of contamination by agricultural ...
Polytunnel. A polytunnel (also known as a polyhouse, hoop greenhouse or hoophouse, grow tunnel or high tunnel) is a tunnel typically made from steel and covered in polyethylene, usually semi-circular, square or elongated in shape. The interior heats up because incoming solar radiation from the sun warms plants, soil, and other things inside the ...
In agriculture and gardening, row cover is any transparent or semi-transparent flexible material, like fabric or plastic sheeting, used as a protective covering for plants, usually vegetables. Covers are used to extend growing seasons, and reduce undesirable effects of cold, wind and insects. [1] Row covers can reduce the drying effect of wind ...
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