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Application Research of LED in Space Agriculture


Application Research of LED in Space Agriculture

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  With the development of space technology, human space exploration has gradually become a reality. Based on the special requirements of space environment, the light source used in plant cultivation must have high luminous efficiency, output spectrum is consistent with plant photosynthesis demand, small size, light weight and long life. , no pollution and other characteristics.

    Because LED has the basic characteristics required by the space environment, it has become an important artificial light source for space agriculture in recent years. NASA's plant production characteristics of the controlled ecological life-supplement system (CELSS) have listed LED light sources as the preferred source of space plant cultivation systems [34] and commissioned W isconsin Universities and other units carry out research and explore the use of the smallest area to produce the necessary food for a person to live in space. At present, it has been studied to use 6~14 m2 to provide a person with the flour, beans, potatoes, vegetables, tomatoes, Production mode of corn and other foods. Cuello and other studies found that the conversion rate of LED light energy in CELSS system is five times higher than that of Xenon metal halide lamp.
    Bula et al. proposed the characteristics of space plants, and proposed that the artificial plant light source in CELSS system must have the characteristics of high luminous efficiency, suitable light quality, small volume, light weight, long life, safe and reliable, and no pollution. It is pointed out that LED is the most ideal. Space plant light source.
    Guo Shuangsheng et al. used the red and blue species under the conditions of 22 °C, relative humidity 70%, CO2 concentration 500 μmol·mol-1, and illumination period 24 h (bright) / 0 h (dark) in the simulated space compartment. Four different combinations of LEDs were used as illumination sources. Plant cultivation experiments were carried out under porous soil and porous ceramic particle soilless cultivation equipment. The results showed that the plants grown under the red LEDs were initially braided, and later erect and slender; red and blue LEDs The plant growth under the combination is basically normal, but 90% red LED + 10% blue LED is more suitable. This result has important reference value for the application research of space agriculture LED in China.