Nute Burn or Heat Stress???

Hey Yall

I need some advice on if either my baby has heat stress or nute burn. Started from seed, its in veg stage for the last 6 weeks. Im useing DNF nutes on full recomended strength in Pro Mix. 600 watt MH cool tubes, the room temp is at a steady 26 degrees celcius but it did climb up to 31-32 for a few days a couple weeks ago. The light is about 20" from top of plant. I flushed the plant a week ago then have continued with the nutes...should I keep using nutes or plain ph'd water? lower room temp? Any help would be great! Here are a couple pics.....

nute burn imo, from 14 years xp, plain water for a week ,then check ,newer growth should be fine,

i second the motion.........nute burn

I have found running full strength nutes is just asking for trouble. Try backing off to 1/2 strength.

I can see heat stress in the first pic, but not where you think. Look at the whole plant and notice the hunched over look.
Solution: water. The brown edges is something else, likely a mineral deficiency. Don't know about them.

BigSteve.

Thanks everyone

Ive started plain water...gonna try flush this out. I also think the temp should prob come down a bit....has anyone heard of cool tubes creating hot spots that could be burning my plants too? I was wondering if taking the glass out, will it "actually" be cooler....Re: Jorge Cervantes's...?

U need to read uncle bens thoughts on flushing

MendoKing said:

Thanks everyone

Ive started plain water...gonna try flush this out. I also think the temp should prob come down a bit....has anyone heard of cool tubes creating hot spots that could be burning my plants too? I was wondering if taking the glass out, will it "actually" be cooler....Re: Jorge Cervantes's...?

Click to expand...

How much air are you pushing through the tube and where are you venting it? Also, how far away from the plants is it. I have found with good ventilation you can push the light a little bit closer. I broke down and bought an infrared thermometer. I can get accurate temps on the tips of my plants that way and keep them around 78 degrees. I also run an air conditioner just on the dehumidify setting. It will tame two vented 1000w lights without even kicking on the actual air conditioning setting pretty well.