plants burning cant figure out why

grapeoptimo

grapeoptimo

Well-Known Member
switched to LED's a few runs ago and I have been burning the plants somehow, running jacks, watching my runoff EC, co2 is 1200ppm, room is sealed, room stays around 78 and 60% humidity with lights on. any suggestions...strain is rabbit king, headband x banana nightshade.
 

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MustGro

MustGro

Well-Known Member
Doesn’t look like light burn.
What’s the PH and PPM of your input solutions?
60 RH is the high end for flower but that just makes them transpire and drink less. Plus bad for molds/mildews. IMHO anyway.
 
Dank Bongula

Dank Bongula

Well-Known Member
How close are your lights and have you double checked your math in regards to decimal errors with you EC?
 
grapeoptimo

grapeoptimo

Well-Known Member
Dank Bongula said:
How close are your lights and have you double checked your math in regards to decimal errors with you EC?
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lights are about 20 inches away. 800ppfd. its coco and jacks, feeding 321 dialed back to 90% strength. have been flushing them already just not seeing improvement yet.
 
W

waterproof808

Well-Known Member
Your EC sounds pretty high. If I mix Jacks at 3.0g-2.0g-1.0 gram per gallon I end up with 1.6EC and dont have any issue with burning leaf tips or deficiencies.
 
Herb & Suds

Herb & Suds

Well-Known Member
It looks to me like you added heat , what are your canopy temps and did you recently change lighting configuration?
 
MustGro

MustGro

Well-Known Member
grapeoptimo said:
ec is around 1.9 - 2.0 runoff ec is a little high so im leaning towards that & flushing.
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That EC shouldn’t burn up your plants like that, I’m up that high with Jack’s in flower in my hydro setup and I get burnt tips, but nothing like you have. How much fluid do you let drain through them?
You never told us the PH of your solutions.
Looks like nute burn from buildup in the coco or possibly ph problems.
 
grapeoptimo

grapeoptimo

Well-Known Member
MustGro said:
That EC shouldn’t burn up your plants like that, I’m up that high with Jack’s in flower in my hydro setup and I get burnt tips, but nothing like you have. How much fluid do you let drain through them?
You never told us the PH of your solutions.
Looks like nute burn from buildup in the coco or possibly ph problems.
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ph 6.2 in coco, it i think it was to little run off and a sensitive strain
Herb & Suds said:
It looks to me like you added heat , what are your canopy temps and did you recently change lighting configuration?
Click to expand...
a low run off issue.
 
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