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be reduced. This brings a huge potential to improve the farming sector, which is key to long-term economic stability. The small polytunnels used by each farmer in each village promote the cultivation of vegetables both on-season and off-season, and would actually help to moderate the market rate for fruit and vegetables in long run, on a year-round basis, and would help to satisfy local market needs.
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If developing countries were to develop a special incentive program solely for fruit-and-vegetable farmers, especially in demographically large nations like India, then the migration rate from rural to urban areas (as well as the loss of horticultural and fruit/vegetable farmers) to urban areas may
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spectrum from high tunnels through low tunnels to the simplest row covers, although they are often thought about as discrete steps. Major themes of continuing development are (1) achieving the same results with lighter construction and less cost and (2) making hoophouses easily movable. The
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heating that every polytunnel provides, every variation of auxiliary heating (from hothouse heating through minimal heating to unheated houses) is represented in current practice. The nesting of row covers and low tunnels inside high tunnels is also common.
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Hoophouses have existed at least since the 1940s, but they are much more commonly used with each passing decade, and their design continues to evolve. Because of the wide variety of constantly changing designs, in reality there is an entirely
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For example, in India, the inability to grow tomatoes generates price spikes during the monsoon season. This is seen as an ideal time to grow tomatoes in polytunnels, since they provide the ideal climate for the crop. In India, the
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High-tech poly houses even have space-heating systems as well as soil-heating systems to purify the soil of unwanted viruses, bacteria, and other organisms. The recent Indo-Israel collaboration at
Gharunda, near
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from the sun warms plants, soil, and other things inside the building faster than heat can escape the structure. Air warmed by the heat from hot interior surfaces is retained in the building by the roof and wall.
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In recent years the true adaptability of polytunnel structures has been realised by adapting them to suit livestock housing. It is now commonplace in the UK to see polytunnels used for housing
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Polytunnels can be used to provide a higher temperature and/or humidity than that which is available in the environment but can also protect crops from intense heat, bright sunlight,
362:/misters are used to reduce the temperature. This does not increase the humidity levels in the poly house as the evaporated droplets are almost immediately ventilated to open air.
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is not quite strong enough for them to survive outdoors. Temperature increases of only 5 to 15 °C (9 to 27 °F) above outdoor ambient, coupled with protection from the
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can be controlled by equipment fixed in the polytunnel or by manual opening and closing of vents. Polytunnels are mainly used in temperate regions in similar ways to glass
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that simulates the temperatures of a location several hardiness zones closer to the equator (and protects from wind as well).
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481:"High Tunnels: Using Low-Cost Technology to Increase Yields, Improve Quality and Extend the Season"
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Every factor influencing a crop can be controlled in a polytunnel. Polytunnels are often used in
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In a tropical climate, temperatures are prone to soar above all normal levels. In such cases,
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program is helping farmers install polytunnels. The program was announced at the US
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is an excellent example of
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509:"Winter Production in the High Tunnel | Johnny's Winter Growing Guide"
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Polytunnels are mainly used in temperate regions in similar ways to
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A Missouri farmer inspecting an early tomato crop in a hoop house.
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USDA promotes hoop houses at White House garden event intro
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grows flowers and organic vegetables in polytunnels.
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to be grown at times usually considered off season;
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428:advantages of mobile hoophouses include greater
571:(Press release). Washington, DC. Archived from
377:FlockMaster Livestock Polytunnel - Church Farm
282:value of the plants can justify the expense.
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207:Superbay Polytunnel at Van Arnham Nurseries
479:Blomgren, Ted; Frisch, Tracy (May 2007).
119:Learn how and when to remove this message
565:United States Department of Agriculture
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533:Bhattacharyya, Pramit (17 May 2012).
342:are also cultivated in the same way.
266:Superbay Polytunnel - Otter Nurseries
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650:Polytunnels - FAQ & Buyers Guide
440:) to cure greenhouse soil sickness.
57:adding citations to reliable sources
535:"Planting the seeds of prosperity"
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681:Portable buildings and shelters
349:Multi-Span Polytunnel - Evesham
135:Polytunnels on Balhungie Farm,
44:needs additional citations for
638:Polytunnels: Second generation
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235:commonly use polytunnels for
652:on First Tunnels 17 May 2023
640:on Hortweek 13 February 2015
586:Tharp, Mike (17 July 2009).
445:US Department of Agriculture
334:. Other soft fruits such as
646:on Hortweek 6 November 2015
644:Polytunnels - Fresh Produce
634:on Hortweek 1 November 2016
567:(USDA) (16 December 2009).
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404:Abhinav Farmers Club
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575:on 31 January 2010.
513:www.johnnyseeds.com
462:to grow tomatoes.
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592:McClatchyDC
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466:References
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109:April 2023
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619:YouTube
360:foggers
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