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Effect of various wavelengths of light on plants

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 .

 3 , 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

 4 , 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 .

 5 , when the plants with a plant light fill light , the distance of the blade height is generally 0.5 to 1 meter

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