Light environment is one of the important physical environmental factors that are indispensable for plant growth and development. Controlling plant morphogenesis through light quality regulation is an important technology in the field of facility cultivation.
LED plant growth light is a kind of lamp that uses LED as the light source, and needs sunlight according to the law of plant growth.
LED grow light helps to shorten the growth cycle of plants, because the light source of this light is mainly composed of red and blue light sources, using the most sensitive light band for plants, red light wavelengths use 620-630nm and 640-660nm, blue light wavelengths 450-460nm and 460-470nm were used. It allows plants to promote the differentiation of multiple lateral branches and buds during the growth process, accelerate the growth of roots, stems and leaves, accelerate the synthesis of plant carbohydrates and vitamin synthesis, and shorten the growth cycle.
The large number of LEDs in vertical grow rack systems should indicate that LED grow lights are especially suitable for artificial light-controlled plant facility cultivation environments.
The color temperature and lumens of artificial light sources are seen by the eyes of living things, while the demand of plants for light is photosynthesis, which is determined by the radiation value regardless of color temperature and lumens.
The effect of spectral range on plant physiology
(1) 280~315nm––> This wavelength is already ultraviolet light, and it has the function of direct suppressive growth for the growth of various animals, plants and even fungi, and has minimal impact on the morphological and physiological processes.
(2) 315~400nm––> This kind of light wave is also far-ultraviolet light. Although there is no ultraviolet light to harm plants, it has no direct effect on plant growth, and the absorption of chlorophyll is small, which affects the photoperiod effect and prevents stem elongation.
(3) 400~520nm (blue) –> Such wavelengths can directly develop the roots and stems of plants, and have the largest absorption ratio of chlorophyll and carotenoids, and have the greatest impact on photosynthesis.
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