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Flora Nova Grow is Extremely concentrated 7-4-10. You could see burn overnight. Have a good look throughout the plant. Fish 5-1-1 Veg with PBP bloom & PK-13-14 flower. Quite often you'll only see a leaf or two with a burn (not always a bad thing). If it's not severe.
FloraNova Grow 3.5ml per gallon.
Floralicious plus .5ml per gallon
The plant is about 14" and just itching to go into flower.
It's been 24 hours and I've just noticed some brown areas appearing on some of the top leaves.
It could also be heat stress. It was about 8" from the 400hps, but I have a piece of glass between them (homemade cooltube).
I just raised the lamp to 12" above canopy.
Canopy temp was about 83.
Now it's 80.
I'll keep my fingers crossed and hope it doesn't get worse.
Ya. nuteburn does not happen or start at the top, it can happen on tops when the rest of the plant has been affected, normally it starts lower and goes up the plant as it progresses.
It may be heat stress, 8 in away from a small plant will get heat stress even if you have a cool tube, this is due to lumens being close.