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

Claim 1

In a greenhouse having a roof supported on rows of pillars, the improvement which comprises an environmental control installation, said installation comprising a plurality of elongated air-distribution ducts extending toward the interior of the greenhouse over an end of each duct proximal to an external wall; a respective air-displacement unit mounted on said end of a respective duct, each of said ducts comprising a U-section light weight reinforced concrete member and precast concrete slabs covering said members, said members being disposed overhead along respective rows of said pillars; a respective spray means disposed between each of said units and a respective duct for spraying water into the air displaced along the duct, said ducts each being formed with outlets along an upper side thereof, and means for selectively directing the air from said outlets upwardly and laterally; a CO2 injection station connected with said spray means for injecting carbon dioxide into the water sprayed into the air displaced by said units; an emulsion preparing station connected with said units for distributing an anti-pest emulsion into the air displaced thereby; and a network of pressureless distribution conduits connecting said ducts and supplying same with irrigation and fertilizer liquid, said conduits being formed with dropping pipes for dripping liquid from said distribution conduits.