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The application field of the LED grow light
2021-10-20
Application of LED in plant cultivation
As the fourth generation of new lighting source, LED has many characteristics different from other electric light sources, which also makes it the first choice of energy-saving and environmental protection light sources.
LEDs used in the field of plant culture also show the following characteristics: rich wavelength types, just consistent with the spectral range of plant photosynthesis and light morphogenesis; The half width of the spectral wave is narrow, which can be combined to obtain pure monochromatic light and composite spectrum as required; It can focus light of specific wavelength to irradiate crops evenly; It can not only regulate the flowering and Fruiting of crops, but also control the plant height and plant nutrients; The system has less heat and small occupied space, and can be used in multi-layer cultivation three-dimensional combination system to realize low heat load and miniaturization of production space; In addition, its strong durability also reduces the operation cost. Because of these remarkable characteristics, LED is very suitable for plant cultivation in controllable facility environment, such as plant tissue culture, facility horticulture and industrialized seedling raising, aerospace ecological life protection system and so on.
Study on the application of LED in plant protected cultivation
As of 2013, the area of protected horticulture in China has developed rapidly, and the light environment control lighting technology for plant growth has attracted attention. Facility horticultural lighting technology is mainly used in two aspects: first, it is used as supplementary lighting for plant photosynthesis when there is little sunshine or short sunshine time; 2、 As an induced illumination for plant photoperiod and light morphogenesis.
1. Research on LED as supplementary lighting for plant photosynthesis the traditional artificial light source generates too much heat. For example, with LED supplementary lighting and hydroponic system, the air can be recycled, too much heat and water can be removed, and the electric energy can be efficiently transformed into effective photosynthetic radiation and finally into plant matter. The results show that the growth rate and photosynthetic rate of lettuce are increased by more than 20% by using LED lighting. It is feasible to use led in plant factory. It was found that compared with fluorescent lamp, mixed wavelength LED light source can significantly promote the growth and development of spinach, radish and lettuce and improve the morphological indexes; It can maximize the biological accumulation of sugarbeet, the beet element accumulation in hairy root is the most significant, and produce the highest sugar and starch accumulation in hairy root. Compared with metal halide lamp, the anatomical morphology of stems and leaves of pepper and perilla plants grown under wavelength LED changed significantly, and the photosynthetic rate of plants increased with the increase of optical density. Complex wavelength LED can increase the number of stomata of marigold and sage.
2. LED, as the inducer of plant photoperiod and light morphogenesis, can affect the flowering time, quality and duration of plants. Some wavelengths of LED can increase the number of flower buds and flowers of plants; Some wavelengths of LED can reduce the flowering reaction, regulate the pedicel length and flowering period, which is conducive to the production and marketing of cut flowers. It can be seen that led regulation can regulate the flowering and subsequent growth of plants.
As the fourth generation of new lighting source, LED has many characteristics different from other electric light sources, which also makes it the first choice of energy-saving and environmental protection light sources.
LEDs used in the field of plant culture also show the following characteristics: rich wavelength types, just consistent with the spectral range of plant photosynthesis and light morphogenesis; The half width of the spectral wave is narrow, which can be combined to obtain pure monochromatic light and composite spectrum as required; It can focus light of specific wavelength to irradiate crops evenly; It can not only regulate the flowering and Fruiting of crops, but also control the plant height and plant nutrients; The system has less heat and small occupied space, and can be used in multi-layer cultivation three-dimensional combination system to realize low heat load and miniaturization of production space; In addition, its strong durability also reduces the operation cost. Because of these remarkable characteristics, LED is very suitable for plant cultivation in controllable facility environment, such as plant tissue culture, facility horticulture and industrialized seedling raising, aerospace ecological life protection system and so on.
Study on the application of LED in plant protected cultivation
As of 2013, the area of protected horticulture in China has developed rapidly, and the light environment control lighting technology for plant growth has attracted attention. Facility horticultural lighting technology is mainly used in two aspects: first, it is used as supplementary lighting for plant photosynthesis when there is little sunshine or short sunshine time; 2、 As an induced illumination for plant photoperiod and light morphogenesis.
1. Research on LED as supplementary lighting for plant photosynthesis the traditional artificial light source generates too much heat. For example, with LED supplementary lighting and hydroponic system, the air can be recycled, too much heat and water can be removed, and the electric energy can be efficiently transformed into effective photosynthetic radiation and finally into plant matter. The results show that the growth rate and photosynthetic rate of lettuce are increased by more than 20% by using LED lighting. It is feasible to use led in plant factory. It was found that compared with fluorescent lamp, mixed wavelength LED light source can significantly promote the growth and development of spinach, radish and lettuce and improve the morphological indexes; It can maximize the biological accumulation of sugarbeet, the beet element accumulation in hairy root is the most significant, and produce the highest sugar and starch accumulation in hairy root. Compared with metal halide lamp, the anatomical morphology of stems and leaves of pepper and perilla plants grown under wavelength LED changed significantly, and the photosynthetic rate of plants increased with the increase of optical density. Complex wavelength LED can increase the number of stomata of marigold and sage.
2. LED, as the inducer of plant photoperiod and light morphogenesis, can affect the flowering time, quality and duration of plants. Some wavelengths of LED can increase the number of flower buds and flowers of plants; Some wavelengths of LED can reduce the flowering reaction, regulate the pedicel length and flowering period, which is conducive to the production and marketing of cut flowers. It can be seen that led regulation can regulate the flowering and subsequent growth of plants.
