Does anyone know if this is HEAT STRESS?

max316420

max316420

Well-Known Member
Never experienced this before so I don't really know what it is, I'm thinking heat stress because I think my 1000 watt hps light was a little close and it's really only effecting the upper fan leaves not the very top but doesn't seem to be doing it to the outter plants, just the ones that were directly under the bulb. Opinions would greatly be appreciated. p.s. I backed the lights off already.....
 

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Bigger leaves are turning a yellowish color while the smaller leaves are green.
  • Nitrogen deficiency - add nitrate of soda or organic fertilizer.
Older leaves will curl at edges, turn dark, possibly with a purple cast.
  • Phosphorous deficiency - add commercial phosphate.
Mature leaves develop a yellowish cast to least veinal areas.
  • Magnesium deficiency - add commercial fertilizer with a magnesium content.
Mature leaves turn yellow and then become spotted with edge areas
turning dark gray.
  • Potassium deficiency - add muriate of potash.
Cracked stems, no healthy support tissue.
  • Boron deficiency -add any plant food containing boron.
Small wrinkled leaves with yellowish vein systems.
  • Zinc deficiency - add commercial plant food containing zinc.
Young leaves become deformed, possibly yellowing.
  • Molybedum deficiency - use any plant food with a bit of molybdenum in it.
 
yes that is heat stress, good thing you backed the lights off, i had something similar to that and my plant looked like that leaf but it was the whole plant lol. I had a few plants in the car with the windows rolled up and it was summer so they burnt the fuck up.out of 5 plant only 2 lived and both was hermie so i conclude that massive heat stress is prone being a hermie so keep an eye on it.
 
luckily i caught it early, i knew it couldn't have been a def cause been feeding them pretty heavily. I think it might be called radiant heat stress. I got a light meter but its not much help, so I have a total environmental controller and im putting the sensor were the tops were to see what the temps are. anyone else have any opinions??
 
got a ac runnin 24/7 but im also runnin 3000 watts in a pretty small room, plus a co2 burner. Ive seen the temp climb into the 90's plus I have 3 fans in there too but every once in a while it gets HOT in there.
 
thats so overkill that's why your prone to have heat stressed. If i had it like you I would buy a second grow tent and have 2 rooms running for a perpetual harvest. 2000 watts in that room and 1000 watts in another grow tent.
 
try replacing the co2 burner with a co2 tank, the burner adds heat while the tank will add no heat and could be the edge you need to combat the heat because co2 allows plants to grow in higher temperature, but 3000 watts and a co2 burner is overkill in heat, i could imagine the Ac bill going up the roof.
 
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It's not overkill when you have 36 plants per light and I run 600 watters for moms and veggin. My bill is between 250-300 bones per month. I do actually have 2 co2 injection systems but the tanks run out to quick cause i like to keep the co2 ppm between 1200-1500 ppm
 
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