For a long time, the artificial light sources used in the field of agricultural lighting mainly include high-pressure sodium lamps, fluorescent lamps, metal halide lamps, and incandescent lamps. The outstanding drawbacks of these light sources are high energy consumption, high operating costs, and energy consumption costs account for about 40 percent of the system's operating costs. % to 60%. With the rapid development of LED technology, the application of low-energy, high-efficiency light sources in agriculture has become possible. LED is considered to be the most promising artificial light source in the agricultural field in the 21st century and has a good development prospect.
LED can emit the monochromatic light needed for plant growth, and the red and blue LED combination can also form a spectrum that is basically consistent with the photosynthesis and morphogenesis of plants. The light energy utilization efficiency is 80%~90%, and the energy saving effect is extremely significant. . Greenhouses, plant tissue culture, plant factories, and edible mushroom production can be used in place of traditional light sources.
Since 1994, Japan has begun experimenting with LEDs as a lighting source for plant factories. The use of a combination of a red light with a wavelength of 660 nm and a combined light source with a 5% blue LED has been used to grow lettuce and rice crops in artificial plants. Since the 1990s, all countries in the world have actively applied LED as a light source for tissue culture.
Artificial light is a commonly used method in greenhouses, and artificial light sources are indispensable environmental control devices in multi-span greenhouses. At present, the greenhouse area in the world amounts to 2.835 million hectares, of which China accounts for more than 86% of the world's total area. Artificial light and lighting are the most important application methods in LED agriculture. Using LED as a light source for greenhouses not only saves energy, it is estimated to be 50%-60%, and it can also improve the spectral distribution of greenhouses and promote Plant growth, increased yield and quality, the market is very optimistic about the prospects.
According to statistics, there are currently more than 300 tissue culture enterprises with an annual output of more than 10 million seedlings, more than 5,000 small-scale tissue culture workshops and laboratories, and a total plant tissue culture area of â€‹â€‹more than 20 million square meters. 200 billion yuan. The research of LED in the field of tissue culture started earlier and the technology is more mature. With the further reduction of the LED cost, it has become possible to fully popularize the dedicated LED light source for tissue culture.
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