Crispy brown areas on the leaves of a few plants - Please Help

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hunter22375

Well-Known Member
I have crispy brown areas on just a few leaves on 3 of my plants. I just switched these to flower about 5 days ago. They are under 1 600w HPS hood. Temps are only about 75 and rh is about 42-48% on average. The fan leaf in the pic is the worst and has actually curled up on the sides. Is this somehow heat damage? The parts that are yellow feel dry to the touch but these plants have never been exposed to excessive heat. I don't know what the issue is.

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fro77

Active Member
did you switch to bloom nutes. culd be a nitogen def.

if you swiched to blloom nutes and no veg nutes that early in bloom
 
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hunter22375

Well-Known Member
They will get their first bloom nutes today......so we will see if that helps. I know its not burns from water on the leaves though. I raised my light some already too....but I can touch the glass and hold my hand there and its only warm.
 
HotShot7414

HotShot7414

Well-Known Member
I kept thinking it may be phosphorus deficiency but then i remembered the symptoms you have Molybdenum deficiency.
 
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hunter22375

Well-Known Member
The pH of the soil is about 6.2 and the lights are about a foot above the canopy. I will post a pic of the whole plant in a while but most of it looks healthy. Its only effected a few of the leaves.
 
lahadaextranjera

lahadaextranjera

Well-Known Member
hunter22375 said:
The pH of the soil is about 6.2 and the lights are about a foot above the canopy. I will post a pic of the whole plant in a while but most of it looks healthy. Its only effected a few of the leaves.
Click to expand...

PH 6.2 is too low for P&K absorption. I would keep it at PH 6.8 for a while.
 
kryptoniteglo

kryptoniteglo

Well-Known Member
Where is it on the plant? Is it the top set of fans leaves? If so, it might be light burn. I had something similar, and it turned out to be that. If you've raised the light and new growth above that is healthy, that might have been the problem.
 
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hunter22375

Well-Known Member
It was a few top fan leaves on 3 different plants.....but there was also one or two lower leaves as well. None of the other plants have it so I don't know.
 
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