The science behind polytunnels and cladding has advanced significantly and new developments continue to benefit growers.Polytunnels have come a long way over the decades since they were designed for use by growers. Then seen as a cheaper alternative to glasshouses, especially for those growers producing crops that did not require such a highly controlled environment, polytunnels were little more than an umbrella over the plants.But they were umbrellas with problems. Early tunnels tended to be unbearably hot in the summertime and stiflingly airless, yet dripping with condensation that made working in them unpleasant as well as causing damage to plants and inviting disease infestation.Light transmission was low and algae quickly built up on the outside of the structures, lowering light transmission even further.
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