Replacement of wood by aluminium alloys as the main structural material for glasshouse construction posed new problems for designers and, in Britain, has resulted in a wide range of different types–-from the single wide span of over 20 m to the 3 m multi-span Venlo. Many environmental factors which influence plant growth in the glasshouse can now be controlled automatically, such as lighting, ventilation and air movement, heating, carbon dioxide enrichment and air humidity.
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