Air conditioning, soil irrigation, fertilization and pest-fighting plant for use in greenhouses

摘要

A system for use in vegetable-growing greenhouses comprising a multiplicity of U-shaped ducts of precast reinforced concrete closed at the top by precast concrete slabs and supported overhead along the lines of pillars supporting the roof of the greenhouse. Each duct has an extremity near an external wall of the greenhouse and is provided with a distributing apparatus for supplying heated and/or cooled fresh air, humidified air, CO2 containing air or air containing a pesticide to the duct which is there provided with pipes for irrigation or fertilizer-carrying water.