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Growth systems and materials: the impact of red and blue light

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發表於 2014-1-9 17:07:17 | 顯示全部樓層 |閱讀模式
LED growth systems and materials

Bula et al (1991 ) First application of LED in plant growth research . Red plus blue LED found supplement its growth characteristics equivalent to cool white fluorescent and incandescent bulbs. Hoenecke et al ( 1992 ) found that LED red light (660nm) to extend the two kinds of lettuce hypocotyl and cotyledons, but the increase 15μmol m-2 s-1 blue light is instead suppressed. Tennessen (1994 ) Comparison with Xenonam-illami red LED light source , a number of different effects on stomatal kudzu Ge blades , but the same as the reactions of photosynthesis . Yanagi et al (1996 ) Comparison of red (660nm) and blue (450nm) LEDs on strawberries, red light has a higher efficiency of photosynthesis . ( 2004 ) and other research Matsuda influence of light quality on display in the rice experiment, red (660nm) with blue (470nm) portfolio , higher than only red photosynthetic capacity.

 

The impact of red and blue light

LED red light can enhance the ability of photosynthesis , the first reason is the red wavelength (600-700nm) can be effectively absorbed by plant chloroplasts. The second reason , LED red light wavelength of 660nm, the peak value of the absorption of chlorophyll .

Effects of blue light on the types of plants is very important , including stomatal control . Therefore, the impact of the exchange of water and carbon dioxide , stem extension and phototaxis . Research Tripathy and Brown (1995) shown in 500μmol m-2 s-1LED red light , wheat seeds can not germinate. Supplementary 30μmol m-2 s-1 blue or use 100μmol m-2 s-1 red light , you can reply chlorophyll synthesis .

Miyashita et al (1997 ) research on LED red potato plantlets increased from 11μmol m-2 s-1 to 64μmol m-2 s-1 range , increase the amount of light can stimulate chlorophyll increased. Compared with fluorescent , LED red light to increase the bud . Yanagi et al (1996 ) found that the lettuce in LED red light more than blue LED leaves and long stems .

More detailed results of the studies reviewed (Review) In this article , in the Journal of agricultural plants or to LEDs as a keyword, you can find a dry piece of research papers. But in recent years in the field cultivation experiment , the conclusion is the LED light source has a significant effect only for a short distance of lettuce and other leafy vegetables lamps , and only a small number of fast-growing of leafy vegetables . No significant differences for fruit and vegetables , and no improvement in energy efficiency for the greenhouse effect .

The numerous advantages of LEDs , such as small size, high energy efficiency, long life, smooth as a cold without heat to provide specific spectra . LED light source for East Asia is the myth of academia began to promote its advantages over , while ignoring the fundamental problem : the high cost and low energy light . LED industry in 2011 reduced to four miserable industry , one of the main reason is that over-exaggerated their mythology miracle, rather than systematic, comprehensive consideration of how industrial applications.
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