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The first greenhouse was built in 1963 and the technique was extended by the Campo de Dalías or Poniente Almeriense and later by the Campo de Níjar, in the east. The use of polyethylene as a substitute for glass had already been tested in the Canary Islands and Catalonia. The plastic was spread over wooden posts or metal structures and ...
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.
The South Korean White Revolution is a term used to refer to the extensive use of plastic films (specifically, polyethylene film) for greenhouses, mulching and Polytunnels. This practice turned the color of the landscape from green to white, due to the large area of agricultural land under protected cultivation.
The terms greenhouse, glasshouse, and hothouse are often used interchangeably to refer to buildings used for cultivating plants. The specific term used depends on the material and heating system used in the building. Nowadays, greenhouses are more commonly constructed with a variety of materials, such as wood and polyethylene plastic. [2]
More shallow greenhouses or those with loosely built structures and natural ventilation won’t present the same level of concern as deep or tightly sealed underground gardens, says Kovach.
Polytunnels on Balhungie Farm, Angus 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.
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