The agricultural greenhouse of the invention and the plant cultivation method using the same can cultivate plants economically and efficiently with less energy per crop yield, as it is provided with a CO.sub.2 supply means, a heat-ray shielding means, and a dehumidification and cooling means, the heat-ray shielding means is formed of using a heat-ray reflecting film, and plural through holes are formed in the heat-ray shielding means. The heat-ray reflecting film structure can cultivate plants by the agricultural greenhouse utilizing sunlight economically and efficiently as it has a structure that narrow band-shaped tapes obtained by cutting a multi-layer laminated film made by laminating at least two kinds of resin layers with different refractive indices alternately and having an average transmittance at 80% or more for visible light and an average reflectance at 70% or more for heat-ray is woven or knitted as a warp or a weft.

A horticultural plant growing assembly includes a pair of casings, each with a bottom and a side wall. Each side wall includes an upper edge configured to engage one another to define a cavity between the casings. The plant growing assembly further includes a light system, and a plurality of frame members that are connectable together to form a frame, with the light system being attachable to the frame. The plant growing assembly is configurable into a packaged configuration and an assembled configuration. In the packaged configuration, the frame members and the light system are contained within the cavity, and in the assembled configuration the frame members are connected together to form the frame with the light system attached to the frame. One of the casings includes a shelf adapted to support a plant with the light system disposed above the shelf.

A horticultural plant growing assembly includes a pair of casings, each with a bottom and a side wall. Each side wall includes an upper edge configured to engage one another to define a cavity between the casings. The plant growing assembly further includes a light system, and a plurality of frame members that are connectable together to form a frame, with the light system being attachable to the frame. The plant growing assembly is configurable into a packaged configuration and an assembled configuration. In the packaged configuration, the frame members and the light system are contained within the cavity, and in the assembled configuration the frame members are connected together to form the frame with the light system attached to the frame. One of the casings includes a shelf adapted to support a plant with the light system disposed above the shelf.

A greenhouse screen comprising strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of knitting, warp-knitting or weaving process to form a continuous product. The film material comprises a highly transparent, biaxially oriented, UV and flame-stable polyester film which is provided on at least one side with a coating which reduces the reflection of visible light. The greenhouse screen is particularly suited for the cultivation of plants with high light requirements.

A variable thermal insulation assembly includes at least one array comprising a plurality of sheets of film, wherein the plurality of sheets are in a stacked arrangement and each sheet is bonded to an adjacent sheet along a plurality of longitudinally extending regions such that each pair of adjacent sheets form a plurality of longitudinally extending cavities between adjacent regions of the adjacent sheets, a support frame comprising end elements, wherein the support frame frames the plurality of sheets, wherein support frame is coupled to the array to support the array such that the array may transition between an expanded state in which the array is expanded, and a compressed state in which the array is compressed, within the plane of the frame along the direction perpendicular to the longitudinal axis such that the longitudinally extending cavities are expanded or compressed, wherein in the expanded state, the front edge conforms to one of the second end of the support frame or a second front edge of a second array to form a seal that inhibits air flow between the front edge and the one of the second end of the support frame or the second front edge of the second array.

System for covering flat surfaces that is installed on support structures formed by support poles (2) maintained in position by a network of tie-rods (3), both the support poles and the tie-rods being fixed on the surface by means of suitable pins. Said system comprises a plurality of pairs of elongated support elements (6, 6′) having a lower portion positioned on such poles (2) and being joined together in raised position in proximity to their upper end, to form a plurality of pairs of slopes on which protection nets or protection sheets (7) are positioned, which in open position cover the area below the support structure and which in closed position are compact and amassed between adjacent poles (2) of the same row; the movement from the open position to the closed one and vice versa being obtained through the sliding of the sheet along the support elements by means of movement means.

System for covering flat surfaces that is installed on support structures formed by support poles (2) maintained in position by a network of tie-rods (3), both the support poles and the tie-rods being fixed on the surface by means of suitable pins. Said system comprises a plurality of pairs of elongated support elements (6, 6′) having a lower portion positioned on such poles (2) and being joined together in raised position in proximity to their upper end, to form a plurality of pairs of slopes on which protection nets or protection sheets (7) are positioned, which in open position cover the area below the support structure and which in closed position are compact and amassed between adjacent poles (2) of the same row; the movement from the open position to the closed one and vice versa being obtained through the sliding of the sheet along the support elements by means of movement means.

A greenhouse screen is described with strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of knitting, warp-knitting or weaving process to form a continuous product is disclosed. At least some of the strips include a film material in the form of a single- or multilayer polyethylene film having a thickness of 10-70 micrometers. Said film has at least 2-4 wt.-% SiO.sub.2 particles having a D.sub.50 of 2-10 micrometers. The film is advantageously used as a screen providing light scattering properties particularly suited for greenhouse applications.

A greenhouse screen is described with strips of film material that are interconnected by a yarn system of transverse threads and longitudinal threads by means of knitting, warp-knitting or weaving process to form a continuous product is disclosed. At least some of the strips include a film material in the form of a single- or multilayer polyethylene film having a thickness of 10-70 micrometers. Said film has at least 2-4 wt.-% SiO.sub.2 particles having a D.sub.50 of 2-10 micrometers. The film is advantageously used as a screen providing light scattering properties particularly suited for greenhouse applications.

The present invention relates to a coated polyester film equipped on at least one side with permanent antifog coating. The film of the invention is suitable for the production of greenhouse blinds, and has specific transparency properties, permanent antifog properties and high UV resistance. The invention further relates to processes for the production of the polyester film of the invention, and also to use thereof.