Using Artificial Light in Plant Propagation
We are all aware of the importance of light in the growing of plants, of the reaching for light by plants in crowded situations, and of phototropism—the directional attraction to a light source by plants. It has not been my experience, however, to hear much talk of the effects of light on the propagation of plant material.
The light emitted by the sun has many different forms of radiation mixed up in the total product, each characterized by its precise wavelength. Most common amongst these radiations are ultra violet light (UV) at the short wavelength end of the scale, visible light in the middle area, and infra red (IR) emissions of long wavelength producing heat as we know it. UV emissions are of wavelengths of less than 380 nm (1 nm, is one millionth of a mm), while IR is above 780 nm, with visible light being in the area between these two boundaries. It is the energy produced between 380 and 780 nm about which I am referring in this article, and which we call light.
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