A method of making a daylight redirecting window film having a layered structure with a total thickness of less than one millimeter and having at least two optical films bonded together. One of the optical films has a first light redirecting layer disposed on a first side of the film and including a linear array of light redirecting structures configured to reflect light using a total internal reflection and defining a parallel array of narrow channels, and a second light redirecting layers disposed on an opposite second side of the film and including light scattering surface microstructures. The method includes coating a surface of at least one of the films with an optical adhesive, positioning the optical films such that the top portions of the light redirecting structures face inwards, and bonding the films together to form a monolithic multi-layer light redirecting film structure.

A luminescent layer is described comprising an Eu.sup.2+ doped inorganic luminescent material comprising or consisting essentially of the elements Al and/or Si and the elements O and/or N, the doped inorganic luminescent material converting radiation of the UV region between 200 nm and 400 nm of the solar spectrum into the photosynthetically active radiation (PAR) region (400 nm-700 nm) of the solar spectrum, wherein the Si concentration in the inorganic luminescent material is selected between 0 and 45 at. %, the Al concentration between 0 and 50 at. %, the O concentration between 0 and 70 at. %, the N concentration between 0 and 60 at. % and the Eu2+ between 0.01 and 30 at. %.

Luminescent greenhouse glazing structures are described wherein the glazing structures comprise: a glass pane for a greenhouse; and, one or more Eu.sup.2+ doped amorphous inorganic luminescent thin film layers provided over the glass pane, wherein the one or more Eu.sup.2+ doped amorphous inorganic luminescent layers comprise or consist essentially of the elements Al and/or Si and the elements O and/or N; and, wherein the Si concentration is selected between 0 and 45 at. %, the Al concentration between 0 and 50 at. %, the O concentration between 0 and 70 at. %, the N concentration between 0 and 60 at. % and the Eu.sup.2+ between 0.01 and 30 at. %.

The present disclosure provides a shade net made from a monofilament yarn and a shade house with the shade net made of the monofilament yarn. The proposed yarn has a low coefficient of thermal expansion a higher stiffness. The proposed shade net has a simpler construction and is lighter. A shade net made from the proposed monofilament yarn has demonstrated a capability of maintaining temperature and humidity within the shade house with a low co-efficient of variation of 10-15%, and maintaining a reduced temperature within the shade house by up to 3° C. compared to the ambient, with a result of an increased yield of crops by about 7-10% grown within the shade net.

A plant cultivation method includes providing a growth period and a rest period alternately. In the rest period, a dark period and a bright period is alternately provided. In the dark period, an intensity of light applied to a cultivation target plant is lower than a light intensity at a light compensation point. In the bright period, blue light whose wavelength is 400 nm to 500 nm is applied at an intensity that is lower than the light intensity at the light compensation point. A one-cycle time T of repetition of the dark period and the bright period is 2 μs to 500 μs. A duty ratio ΔT/T of a bright period time ΔT to the one-cycle time T is 20% or smaller. The blue light has a photosynthetic photon flux density of 0.001 μmol.Math.m.sup.−2.Math.s.sup.−1 to 4.0 μmol.Math.m.sup.−2.Math.s.sup.−1.

The present invention refers to a method for modulating a condition of a biological cell.

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 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.

High-growth plant cultivation techniques are provided that create efficient, optimized growing conditions, including a high concentration of photosynthetically active radiation (“PAR”) in terms of photon flux density, and with extremely low heat. In some aspects of the invention, these techniques comprise a specialized growth chamber and a control system that promote an enhanced level of growth, particularly for autoflowering cannabis. In addition, aspects of the invention create an accessible, user-friendly, aesthetically pleasing new type of display for a plant, ideal for cultivating cannabis and, in particular, autoflowering cannabis. The unique combination of techniques set forth in the invention create high yields of cannabis plant matter (up to 3 or 4 times greater than other methods) in substantially less time (just 60 days from seed to harvest).

The invention relates to a horticultural and/or agricultural greenhouse for cultivating crops therein, comprising: multiple rows of support columns connected by transverse frames for forming a roof support construction, each of the transverse frames having a frame length; a substantially horizontal fabric screen for at least partially darkening and/or thermally shielding the greenhouse, wherein the fabric screen is suspended between adjacent transverse frames and divides the greenhouse in a cultivating space below the fabric screen and a roof space above the fabric screen; and a ventilation system with a ventilation device for displacing air within the cultivation space and/or between the roof space and the cultivation space, wherein the ventilation system further comprises a ventilation device adapter having a longitudinal axis and configured for receiving the ventilation device and for being secured to one or more of the transverse frames.