Effect of various wavelengths of light on plants

posted on 12 May 2014 15:42 by tilibeibei
To facilitate the study of the color properties of light , The visible spectrum surrounded by a ring, And divided into nine regions , Called color ring . Color shade ring numerals corresponding wavelength in nanometers (nm), any two color rings on the top position in the color sector , mutual called complementary color .
 For example , blue (435 ~ 480nm) of the complementary color is yellow (580 ~ 595nm). Found by the shade has the following characteristics :
( 1) complementary color obtained by mixing a certain percentage of the white light . Such as blue and yellow mix get is white . Similarly, glaucoma and orange light is also obtained by mixing white ;
( 2 ) any color on color rings can be used on both sides of two adjacent monochromatic light can even copy from a mixture of two monochromatic second nearest neighbor . Such as yellow and red mix to get orange light. More typical is mixed red and green become yellow ;
( 3 ) If you choose three separate monochromatic light in color ring . Can be mixed in different proportions may occur in daily life into various shades . The three primary colors of light is called monochromatic . Optics primary colors red, green and blue. Note here that the pigment primary colors red, yellow and blue. However, the primary colors of choice is completely arbitrary ;
( 4 ) When the sunlight of an object , a light of a wavelength absorbed by the object , the color displayed object (reflected light ) for the complementary color shade . As the sun light shines on the object right, if the object absorbed wavelength 400 ~ 435ntn violet , the objects appear yellow-green. Here it should be noted : Some say the color of the object is an object absorbs other shade, the color of the reflected light .
This argument is wrong. For example, yellow-green leaves, actually only absorbs wavelengths of 400 ~ 435urn violet , yellow-green is showing mixed results reflected other shade , not only the reflected light yellow-green. 1 , the impact on plant physiology spectral range 280 ~ 315nm: effects on morphology and physiological processes is minimal 315 ~ 400nm: Chlorophyll absorbs little impact photoperiod effect , prevent stem elongation 400 ~ 520nm ( Blue ) : the proportion of chlorophyll and carotenoid absorption maximum , the greatest impact on photosynthesis 520 ~ 610nm ( green ) : pigment absorption rate is not high 610 ~ 720nm ( red ) : chlorophyll absorption rate, has a significant influence on photosynthesis and photoperiod effect 720 ~ 1000nm: absorption rate, stimulate cell elongation , impact of flowering and seed germination > 1000nm: converted into heat 2 , from the above data, the need for plant photosynthesis light wavelength of about 400 ~ 720nm. 440 ~ 480nm blue ) light and 640 ~ 680nm ( red ) for photosynthesis greatest contribution . 520 ~ 610nm ( green) light is absorbed by the plant pigment ratio is low .
In accordance with the above principle, plant lights are basically made ??of a combination of red and blue , all blue , all red in three forms , covering Wavelength range for photosynthesis . The visual effect , the combination of red and blue lights showing pink plants . Special White pointed out that with the green light for photosynthesis similar , and no action
.Red and blue lights chromatography proportion of plants in light of the general Is preferably between 5:1 to 10:1, usually 7 to optional ratio 8:1 . Of course, conditional proportion of red and blue light can be adjusted according to the best plant growth cycle .
When the plants with a plant light fill light , the distance of the blade height is generally 0.5 to 1 meter

edit @ 12 May 2014 15:46:21 by sunshie