FIELD: agriculture. SUBSTANCE: method involves delivery of carbon dioxide gas. Smoke gas from a boiler house is delivered to an air conduit located in a hothouse. The air conduit is made of polyethylene terephthalate film. The air conduit has molecule-size channels 12. The device is provided with air conduits inside the hydroponics plant growing units. The device also has a smoke gas delivery pipeline communicating with end-faces of the air conduits, and another pipeline for withdrawal of this gas open to other end-faces. EFFECT: lower cost of smoke gas cleaning; more effective plant dressing. 7 cl, 2 dwg
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