Before the emergence of LED-PARS, the artificial radiation sources of plants used incandescent lamps, fluorescent lamps and high-pressure sodium lamps. The common shortcomings of these artificial radiation sources were that the wavelength could not be effectively controlled and the luminous efficiency was low.
Electric energy is converted into heat, and the photosynthetic radiation efficiency of plants is low. The semiconductor lighting source (SSL) that has appeared in recent years has brought a revolutionary turning point to artificial radiation sources for plants, and has gained a high degree of importance in the global agricultural field.
Depending on. The new generation of plant artificial radiation source, LED-PARS, has many incomparable characteristics. It is a very promising artificial radiation source and the most ideal plant artificial light source at present.
The main advantages of LED-PARS:
1) High photoelectric conversion efficiency, small size, high shock resistance, long life, fixed wavelength and low heat generation.
2) LED-PARS occupies a small space and can be used in a multi-layer cultivation system. Suitable for the establishment of plant factories.
3) It can promote plant growth, shorten plant growth cycle, increase yield, and reduce plant production costs.
4) The combination of different red, blue and far red wavelengths can affect and control the occurrence of certain plant pathogenic bacteria.
5) It is not affected by the season, and effectively protects against pests and diseases.
6) It can have stable plant quality and productivity. Realize the standardized mass production of plants in plant factories.
7) It can produce virus-free healthy plant products. It is currently the world's highest quality pollution-free plant product.
8) Plant production in ACE-SYS mode can be realized.
Note: ACE is the abbreviation of Environment (Environment) proposed by Professor Ting, K.C.
The application of LED plant growth lights in vegetable production, the application of LED plant growth lights in vegetable production
The two major "bottlenecks" in the development of plant factories are high initial investment costs and high energy consumption. Generally, energy consumption costs approximately 50%-60% of the overall operating costs. If artificial light sources with low energy consumption, high efficiency and good light quality can be used, and crops with higher economic value can be selected for cultivation, it is an important direction for the development of plant factories. Currently, artificial light sources in plant factories mostly use high pressure sodium lamps (HPS) and fluorescent lamps (Tubular Fluorescent Lamps, TFL).
But in recent years, with the development of optoelectronic technology. The application of LED plant growth lights in plant factories has gradually attracted widespread attention from all over the world.
LED is the abbreviation of English Light Emitting Diode (light emitting diode), is a solid-state semiconductor device, composed of III-IV compounds, such as GaAs (gallium arsenide), GaP (gallium phosphide), GaAsP (gallium arsenide phosphorous), etc. Semiconductor system
As a result, solid semiconductor chips are used as luminescent materials. When a forward voltage is applied to both ends, the
The currents recombine, releasing excess energy and causing the emission of photons to produce visible light, which can directly convert electricity into light. Compared with artificial light sources such as incandescent lamps and fluorescent lamps, the advantages of LED light sources are: (1) Use of electricity
Low source voltage, energy saving and high efficiency; (2) Can emit monochromatic light with narrow light wave: (3) Cold light source; (4) Can emit pulsed light in a very short time; (5) Small size, strong stability, Fast response time; (6) Yes
The environment is pollution-free; (7) The structure is compact and the life is long. Under the same lighting effect, LED power consumption is one-eighth of incandescent lamps and one-half of fluorescent lamps, which is very useful for saving energy and reducing the greenhouse effect.
Profit. At the same time, as a cold light source, LED can illuminate plants at close range, which will greatly improve the efficiency of space utilization.
The first in the world to use LEDs for plant cultivation was Mitsubishi Corporation of Japan. As early as 1982, there was a test report on the use of red LED light sources with a wavelength of 650nm to supplement light in greenhouse tomatoes. Since then, the NASA Research Center in the United States has also carried out research on this technology as one of the related technologies of closed life support systems such as space bases, and hopes that LEDs will be an important light source for plant cultivation in artificial environments. In terms of plant species, it has been proven that many crops or flowers can be successfully cultivated with LED plant growth lights.
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In 1994, Japan began to use LEDs as lighting sources to conduct research on plant cultivation. Use red and blue LEDs to explore the effects of light quality and light quantity on the growth and light morphology of lettuce. Lettuce is cultivated in pure
In the environment of blue LED, it is confirmed that it can be differentiated and grown. Although the dry weight is less than the plant under pure red light or red/blue light, the plant under pure blue light appears sturdier and healthier. Japanese scholars have also used LEDs to cultivate lettuce and have achieved success. Japan's fully-controlled LED plant factory has entered the practical stage.
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Israel has also conducted trials and studies on LED plant supplementary lights in tissue culture plant factories. In 2001, the Facility Technology Development Research Center of the University of Karnataka used red, blue and their combination LEDs to treat lily plants
The research on the differentiation and regeneration of young shoots showed that the combination of red and blue LED lighting can promote the differentiation of flower buds more than other light sources, and is more suitable for the growth of young shoots. The plant size and dry and fresh weight have increased significantly.
Some research departments in Taiwan have also conducted a lot of research on the application of ultra-high-brightness LEDs in plant cultivation. Fang Wei et al. (2002) used non-flickering red and blue LEDs to cultivate Phalaenopsis seedlings and found that compared with the seedlings cultivated under fluorescent lights, there was no significant difference except for the leaf length, thus confirming that LEDs can be used for Phalaenopsis tissue culture Production of seedlings.
The China Aerospace Medical Engineering Research Institute has conducted research on LED combination light sources suitable for the cultivation of higher plants. A light box made of four different combinations of red and blue LEDs is used as an illumination light source to cultivate plants using porous tubes and porous ceramic particles soilless culture technology. Shandong Agricultural University once carried out research on the cultivation of vegetable crops with LED combined light sources, using light boxes made of different combinations of red and blue LEDs as lighting sources to cultivate tomatoes and colored sweet peppers. The above research results have important reference value for the application of Chinese LED in vegetable cultivation in plant factories.
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