In this study, the enviromental control performace of three types of greenhouses for floriculture in Taiwan were evaluated by the greenhouse microclimate models. The heat accumulation of glasshouse were so serious that it required the highly volume ventilation. The open-type plastic house could severed as good protected structures to releave the heat accumulation problems. The temperatures in greenhouse cooled by evaporative cooling technique could not meet the requirement of controlling flowering of Phalaenopsis plants. The refrigeration equiupments was the only choice but the investment would be too expensive. The shading net and rain shelter used popularly could not maintain the adequate climate for ornamental culture for all the year round in Taiwan. The microclimate could be improved by the adequate structures and control devices of greenhouse, but it would increase the production cost. The integrated plan of the several factors is very important to execute the production plan of greenhouse.
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