Heat stress/nute burn?

Springs smoker

Springs smoker

Active Member
Notice couple days ago the leaves starting to curl up on the edge and some tips are crispy. Wondering if its heat stress or nute burn. I'm going in coco, 400w light, humbouldt oneness nutes. I used distiller water, ph around 6. Yesterday I feed with ph water and clear-ex, to try and clear up any salt build up. But I notice the leaves before I feed.


the first four pics are of GSC and the last four of Blue goo.

i raised the lights yesterday hoping this will help.
 

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Pureblood89

Pureblood89

Well-Known Member
a little bit of both, when the leaf blades look like canoes they're respiring to keep cool, the singed tips are the nute burn.
 
Springs smoker

Springs smoker

Active Member
So I moved lights up and positioned the fan to be canopy level. Hopefully this helps the leaves cool off. The temps in the room stay around 75 but I think the light was just to close. Thanks for the help.
 
Pureblood89

Pureblood89

Well-Known Member
as long as you keep the air temp under 85 degrees you'll be fine, anything above that and the chlorophyll screeches to a halt.
 
DannyBlaze

DannyBlaze

Member
The brown on the edges is nute burn of some type not heat you wanna have your light high as possible 16"-20" is good to keep the heat off the plants and the temp down but closet growing season is over unless your closet gots air .....
 
Springs smoker

Springs smoker

Active Member
I got a 4 inch inline fan pulling air out and a 6 inch fan inside, plus passive air through the vents. I'm not having any temp issues at all. Plus I live in colorado, it rarely breaks a 100 in the springs. I am having trouble judging the distance of my light. It's is my first shot using a HID light so I know I don't want it to close but I'm also nervous aout having it to far. Won't that hurt the overall yield and make my plants stretch?
 
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