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General question about light
"Ray" wrote in message . .. 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? Yes we do. The Arizona university photsyntesis pages have a lot on information about breaking the dark period, and the dimophic chemistry that regulates the photoperiod. Additionally, did you see Rotor's comment that as little as 10 ft candles of light will break the period? Read it again. K 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 |
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