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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.
This greenhouse is fairly portable, with three tiers and 12 shelves that are encased in a PE cover. The house has roll-down mesh side windows and a roll-down door for access and airflow, along ...
Portable Greenhouse. This large walk-in greenhouse features zippered front and back doors in addition to exhaust vents, a coated steel frame, and an airtight, UV-protected cover.
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]
Depending on the type of crop and plant to be trellised one can use netting of many different heights (these vary from 50 cm to up to more than 3 meters for use in greenhouses or shade house). When choosing the height of the vegetable trellis netting one should keep in mind that the net should be installed 30–40 cm above the soil.
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.
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