Can drops of water on your leaves cause hotspots?

UncleBuck

UncleBuck

Well-Known Member
Kaendar said:
In case anyone missed it-
http://www.livescience.com/6017-water-drops-magnify-sunlight-burn-leaves.html

http://www.sciencedaily.com/releases/2010/01/100111091226.htm
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way to contradict yourself twice with the same study.


"The problem of light focusing by water droplets adhered to plants has never been thoroughly investigated, neither theoretically, nor experimentally"

"If the focal region of drops falls exactly on the dry plant surface intensely focused sunlight could theoretically start a fire," Horvath said. "However, the likelihood is reduced as the water drops should evaporate before this, so these claims should be treated with a grain of salt."

see how they use the words could, would, and should? it's the same as me saying that jesus would give me a good blowjob if i asked him to, because jesus is cool like that and goves good blowjobs.
 
Kaendar

Kaendar

Well-Known Member
UB fail is hilarious. Way to cherry pick. Nobody had expiremented with it scientifically, until now.

"In sunshine water drops residing on smooth hairless plant leaves are unlikely to damage the leaf tissue," summarised Horvath and co-authors. "However water drops held by plant hairs can indeed cause sunburn and the same phenomenon can occur when water droplets are held above human skin by body hair."
 
cannabineer

cannabineer

Ursus marijanus
Kaendar said:
UB fail is hilarious. Way to cherry pick. Nobody had expiremented with it scientifically, until now.

"In sunshine water drops residing on smooth hairless plant leaves are unlikely to damage the leaf tissue," summarised Horvath and co-authors. "However water drops held by plant hairs can indeed cause sunburn and the same phenomenon can occur when water droplets are held above human skin by body hair."
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Sunburn yes, but not sun ... burn. Droplets don't focus enough wattage. While the temps in the light cone are theoretically high enough, at that small scale plant tissue is an effective heat sink/dissipator. cn
 
Kaendar

Kaendar

Well-Known Member
cannabineer said:
Sunburn yes, but not sun ... burn. Droplets don't focus enough wattage. While the temps in the light cone are theoretically high enough, at that small scale plant tissue is an effective heat sink/dissipator. cn
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Thats all the point I was trying to make. I never said it would cause leaves or plants to burst into flames.. only give a little burnt spot.
 
UncleBuck

UncleBuck

Well-Known Member
Kaendar said:
I never said it would cause leaves or plants to burst into flames.. only give a little burnt spot.
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little chris brown fails again. note where he says that a drop of water can cause a forest fire.

Kaendar said:
A drop of water, embers from a camp fire, lightning strike, cigarette flicked from a car driving by... theres alot of possibilities, unfortunately, most of the time forest fires are caused by man.
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greennewfie

greennewfie

Active Member
a mongo frog said:
please dont do that any more if its over 85 degrees. thats to hot.
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lol its always over 85f or 30c if thats right its been the hottest dryest summer in years here as well, no problems or burns girls are happy cant avoid spraying because gotta keep bugs away lol and cant just hike up a mountain every night to spray lucky i can get there during the day so just praying all works out for us!!
 
cannabineer

cannabineer

Ursus marijanus
Kaendar said:
Thats all the point I was trying to make. I never said it would cause leaves or plants to burst into flames.. only give a little burnt spot.
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If you want my opinion ( a proposition that I don't regard as established) a burn spot could develop, but even from a larger drop it would be a pinprick of necrosis. My curiosity satisfied ... I would not consider it an important mode of plant morbidity. In fact, the hard-water rings from foliar wetting would cost more in terms of photosynthetic action than the pinprick burns, but still nothing significant unless the water's sort of dirty. I avoid foliar wetting not because I'm worried about light burns, but opaque residue (from hardness and dust) and the real, consequential phenomenon of larger-scale chemical burns when folks spray ionics, even at weak hydroponic values, onto green leaves. cn
 
Kaendar

Kaendar

Well-Known Member
cannabineer said:
If you want my opinion ( a proposition that I don't regard as established) a burn spot could develop, but even from a larger drop it would be a pinprick of necrosis. My curiosity satisfied ... I would not consider it an important mode of plant morbidity. In fact, the hard-water rings from foliar wetting would cost more in terms of photosynthetic action than the pinprick burns, but still nothing significant unless the water's sort of dirty. I avoid foliar wetting not because I'm worried about light burns, but opaque residue (from hardness and dust) and the real, consequential phenomenon of larger-scale chemical burns when folks spray ionics, even at weak hydroponic values, onto green leaves. cn
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I never argued the severity of it, just said it could happen.
 
FresnoFarmer

FresnoFarmer

Well-Known Member
a mongo frog said:
only trying to point out that when foliar feeding a good compost tea or a sea weed/kelp foliar in direct sun light over 85
degrees. that the harsh ultraviolet rays have a great chance at killing off your awsome beneficial microbes that u r spraying.
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Oh okay......I thought you were saying that it would burn the leaves.....I agree I have heard the UV rays kill off bacteria. I foliar feed with synthetics so it doesn't really matter.
 
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