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#1
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General question about light
Looking for opinions, science, and/or anecdotal evidence:
(Disregarding the obvious situation in which the light intensity is so great that pant tissues are burned) Is it possible to give a plant too much light? It is well established that too little light will lead to slower growth, more "leggy" growth, and less blooming, and I have frequently heard that plants should be grown as bright as possible without damaging them, but is that really good advice? Are there cases where plants grow better in more subdued lighting? If so, which, and why is that? -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Artwork, Books and Lots of Free Info! |
#2
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General question about light
I've seen some that have better flower color when grown a little shadier --
Epc. Frances Dyer, for one. Kenni "Ray" wrote in message . .. Looking for opinions, science, and/or anecdotal evidence: (Disregarding the obvious situation in which the light intensity is so great that pant tissues are burned) Is it possible to give a plant too much light? It is well established that too little light will lead to slower growth, more "leggy" growth, and less blooming, and I have frequently heard that plants should be grown as bright as possible without damaging them, but is that really good advice? Are there cases where plants grow better in more subdued lighting? If so, which, and why is that? -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Artwork, Books and Lots of Free Info! |
#3
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General question about light
Yes, it is possible to give a plant too much light. Physically, not only
can one burn the leaves (since light is heat) but on a chemical basis the ring structure of chlorophyll gets damaged when bombarded with too much light. (all those double bonds get broken, irreparably) Plants then turn that sickly light green and die. I have noticed that in too much light the inflorescence doesn't elongate properly and flowers are crowded on a stem. Which then makes me wonder about how to detrermine the proper amount of light and my head swims and I come back to the computer and read my silly murder mystery newsgroup. Or watch TV. If you ever really wanted to read up on photosynthesis the University of Arizona has a marvelous photosynthesis page with great links to follow. Googling terms lead to some great papers, too. Dr Wang's research on phal production has a lot of science on proper light levels. To blow my own horn I'll provide the link to Dr Wang's papers via OrchidSafari, *G* http://www.geocities.com/brassia.geo/OSTA.html K Barrett "Ray" wrote in message . .. Looking for opinions, science, and/or anecdotal evidence: (Disregarding the obvious situation in which the light intensity is so great that pant tissues are burned) Is it possible to give a plant too much light? It is well established that too little light will lead to slower growth, more "leggy" growth, and less blooming, and I have frequently heard that plants should be grown as bright as possible without damaging them, but is that really good advice? Are there cases where plants grow better in more subdued lighting? If so, which, and why is that? -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Artwork, Books and Lots of Free Info! |
#4
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General question about light
Ok. my head hurts
On the stupid side, If it blooms and doen't die will that work? Jack |
#5
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General question about light
Do you think you could actually tell us WHERE Dr. Wang's papers are on that
long list? -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Artwork, Books and Lots of Free Info! "K Barrett" wrote in message . .. Yes, it is possible to give a plant too much light. Physically, not only can one burn the leaves (since light is heat) but on a chemical basis the ring structure of chlorophyll gets damaged when bombarded with too much light. (all those double bonds get broken, irreparably) Plants then turn that sickly light green and die. I have noticed that in too much light the inflorescence doesn't elongate properly and flowers are crowded on a stem. Which then makes me wonder about how to detrermine the proper amount of light and my head swims and I come back to the computer and read my silly murder mystery newsgroup. Or watch TV. If you ever really wanted to read up on photosynthesis the University of Arizona has a marvelous photosynthesis page with great links to follow. Googling terms lead to some great papers, too. Dr Wang's research on phal production has a lot of science on proper light levels. To blow my own horn I'll provide the link to Dr Wang's papers via OrchidSafari, *G* http://www.geocities.com/brassia.geo/OSTA.html K Barrett "Ray" wrote in message . .. Looking for opinions, science, and/or anecdotal evidence: (Disregarding the obvious situation in which the light intensity is so great that pant tissues are burned) Is it possible to give a plant too much light? It is well established that too little light will lead to slower growth, more "leggy" growth, and less blooming, and I have frequently heard that plants should be grown as bright as possible without damaging them, but is that really good advice? Are there cases where plants grow better in more subdued lighting? If so, which, and why is that? -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Artwork, Books and Lots of Free Info! |
#6
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General question about light
It's about half way down
here is the paper http://primera.tamu.edu/orchids/paper2pg1.htm If you grow Phals it would be very helpful on bloom stagering from the same crop Jack |
#7
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General question about light
LOL! Where it says
"Articles by Dr. Yin-Tung Wang of Texas A&M click here " K "Ray" wrote in message . .. Do you think you could actually tell us WHERE Dr. Wang's papers are on that long list? -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Artwork, Books and Lots of Free Info! "K Barrett" wrote in message . .. Yes, it is possible to give a plant too much light. Physically, not only can one burn the leaves (since light is heat) but on a chemical basis the ring structure of chlorophyll gets damaged when bombarded with too much light. (all those double bonds get broken, irreparably) Plants then turn that sickly light green and die. I have noticed that in too much light the inflorescence doesn't elongate properly and flowers are crowded on a stem. Which then makes me wonder about how to detrermine the proper amount of light and my head swims and I come back to the computer and read my silly murder mystery newsgroup. Or watch TV. If you ever really wanted to read up on photosynthesis the University of Arizona has a marvelous photosynthesis page with great links to follow. Googling terms lead to some great papers, too. Dr Wang's research on phal production has a lot of science on proper light levels. To blow my own horn I'll provide the link to Dr Wang's papers via OrchidSafari, *G* http://www.geocities.com/brassia.geo/OSTA.html K Barrett "Ray" wrote in message . .. Looking for opinions, science, and/or anecdotal evidence: (Disregarding the obvious situation in which the light intensity is so great that pant tissues are burned) Is it possible to give a plant too much light? It is well established that too little light will lead to slower growth, more "leggy" growth, and less blooming, and I have frequently heard that plants should be grown as bright as possible without damaging them, but is that really good advice? Are there cases where plants grow better in more subdued lighting? If so, which, and why is that? -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Artwork, Books and Lots of Free Info! |
#8
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General question about light
On Sun, 26 Mar 2006 08:45:09 -0500 in Ray wrote:
Looking for opinions, science, and/or anecdotal evidence: (Disregarding the obvious situation in which the light intensity is so great that pant tissues are burned) Is it possible to give a plant too much light? It is well established that too little light will lead to slower growth, more "leggy" growth, and less blooming, and I have frequently heard that plants should be grown as bright as possible without damaging them, but is that really good advice? Are there cases where plants grow better in more subdued lighting? If so, which, and why is that? I can offer one counter example. Ludisia grown as bright as possible without damage turns an ugly (to me) orange color. -- Chris Dukes Suspicion breeds confidence -- Brazil |
#9
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General question about light
Ray, my plants are outside so I try to place them so that they get
morning sun and mottled shade in the afternoon. I am to new at this to have any information you could use. But, this seemed to be a chance to ask about street lights. Are stray lights a problem for day length controlled plants? Joe T |
#10
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General question about light
Of course they can be, but if you consider the inverse-square rule, at any
appreciable distance, the light intensity is next to nothing, so I really have my doubts that it would be an issue. -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Artwork, Books and Lots of Free Info! "jtill" wrote in message ups.com... Ray, my plants are outside so I try to place them so that they get morning sun and mottled shade in the afternoon. I am to new at this to have any information you could use. But, this seemed to be a chance to ask about street lights. Are stray lights a problem for day length controlled plants? Joe T |
#11
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General question about light
On 28 Mar 2006 10:58:45 -0800 in . com jtill wrote:
Ray, my plants are outside so I try to place them so that they get morning sun and mottled shade in the afternoon. I am to new at this to have any information you could use. But, this seemed to be a chance to ask about street lights. Are stray lights a problem for day length controlled plants? I've only seen literature on street lights having an effect on zygo-cacti. Ray makes a good point about inverse square law quickly bringing the effective light level to nill. However, on nights with scattered low clouds , the bank of street lights 2 miles north of me produces entirely too much light in my yard for stargazing to the south. And then there was the apartment I was in where the bedroom window was about 10 feet away from the bulb from the street light. What I'm trying to say, is you need to indicate if you have a pathological case with the street light illumination. -- Chris Dukes Suspicion breeds confidence -- Brazil |
#12
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General question about light
Try http://www.orchidtrek.com/rotor/photperiod.html
and the rest of Rotor's articles. http://www.geocities.com/brassia.geo/OSTA.html K Barrett "?" wrote in message rg... On 28 Mar 2006 10:58:45 -0800 in . com jtill wrote: Ray, my plants are outside so I try to place them so that they get morning sun and mottled shade in the afternoon. I am to new at this to have any information you could use. But, this seemed to be a chance to ask about street lights. Are stray lights a problem for day length controlled plants? I've only seen literature on street lights having an effect on zygo-cacti. Ray makes a good point about inverse square law quickly bringing the effective light level to nill. However, on nights with scattered low clouds , the bank of street lights 2 miles north of me produces entirely too much light in my yard for stargazing to the south. And then there was the apartment I was in where the bedroom window was about 10 feet away from the bulb from the street light. What I'm trying to say, is you need to indicate if you have a pathological case with the street light illumination. -- Chris Dukes Suspicion breeds confidence -- Brazil |
#13
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General question about light
I suspect that the human eye is far more capable of detecting light than is
a plant. If the two were close in sensitivity, stars would prevent plants from blooming! -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Artwork, Books and Lots of Free Info! "?" wrote in message rg... On 28 Mar 2006 10:58:45 -0800 in . com jtill wrote: Ray, my plants are outside so I try to place them so that they get morning sun and mottled shade in the afternoon. I am to new at this to have any information you could use. But, this seemed to be a chance to ask about street lights. Are stray lights a problem for day length controlled plants? I've only seen literature on street lights having an effect on zygo-cacti. Ray makes a good point about inverse square law quickly bringing the effective light level to nill. However, on nights with scattered low clouds , the bank of street lights 2 miles north of me produces entirely too much light in my yard for stargazing to the south. And then there was the apartment I was in where the bedroom window was about 10 feet away from the bulb from the street light. What I'm trying to say, is you need to indicate if you have a pathological case with the street light illumination. -- Chris Dukes Suspicion breeds confidence -- Brazil |
#14
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General question about light
I really don't think the photoperiodicity plays a role in my original query.
Sure, we interpret "x" hours of light and "y" hours of dark, but to the plant, do we really know when that break occurs? In any case where the plants are exposed to a gradual decrease in light intensity, it seems likely that there is some point at which the plant - for all practical purposes - "thinks" it's dark, while to us it may be a long way off. If we put the opaque covering of Dr. Rotor's article on before that point, yes we have shortened the day length, but if it's afterwards, the true day length - to the plant - is actually shorter. -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Artwork, Books and Lots of Free Info! "K Barrett" wrote in message ... Try http://www.orchidtrek.com/rotor/photperiod.html and the rest of Rotor's articles. http://www.geocities.com/brassia.geo/OSTA.html K Barrett "?" wrote in message rg... On 28 Mar 2006 10:58:45 -0800 in . com jtill wrote: Ray, my plants are outside so I try to place them so that they get morning sun and mottled shade in the afternoon. I am to new at this to have any information you could use. But, this seemed to be a chance to ask about street lights. Are stray lights a problem for day length controlled plants? I've only seen literature on street lights having an effect on zygo-cacti. Ray makes a good point about inverse square law quickly bringing the effective light level to nill. However, on nights with scattered low clouds , the bank of street lights 2 miles north of me produces entirely too much light in my yard for stargazing to the south. And then there was the apartment I was in where the bedroom window was about 10 feet away from the bulb from the street light. What I'm trying to say, is you need to indicate if you have a pathological case with the street light illumination. -- Chris Dukes Suspicion breeds confidence -- Brazil |
#15
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General question about light
I have only slowly got my act somewhat together on this orchid thing.
Probably will ask other question as time goes along. Because it is easy here in the Houston/Galveston to use my yard for orchids only small problems crop up. The street light worried me so thanks for discussing that.To much light? I will let you know since mine get a lot of it. I burned a Cattleya pretty bad last summer in what I thought was mottled shade under a Pecan tree. Well. I was blocking the morning sun and not the afternoon! Small problem right? HA! It is a little tricky to find that spot in my yard that has the right lighting, in winter for sure without the leaves. First I am working on growth, later blooming will be cultivated. That Cattleya I sunburned did bloom this winter, burn and all! Ray, all the plants I buy seem to have rotten roots. Your SemiHydro sure is looking better all the time. In a clay pot and saucer even the pot gets into the act providing a wall of dampness around the root system. |
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