Heat stress/Light burn?

Hey guys, it's been awhile.
I have some plants that are yellowing from the top down. I had them pretty close to air cooled 600w trying to get the most lumens for my buck. Based on the pics would you guys agree?
PH 6.8-7.0
PpM 1050
12/12 March 21st
1200 ppm co2 84-88f during lights on
What do you think?

over fert. 1000 ppm is more a hydro feeding level. you probably don't need to feed so much and I'm guessing you're also feeding too often, which builds up in the soil.

Thanks for the reply Pole. I run a reservoir that top drips on every feed. I'll cut the ppm in half and try that. Thanks again.

stop the feeding altogether because those plants will be done soon and you don't want fert buildup to remain in the plant at harvest. just water when the soil is dry.

I would recommend flushing with PhD water

Thank you guys very much for help. I think I need to go back to the basics and chill on the nutes.

polishpollack said:

stop the feeding altogether because those plants will be done soon and you don't want fert buildup to remain in the plant at harvest. just water when the soil is dry.

Click to expand...

I don't know exactly how it works but I'm sure nutrients aren't stored in the plant after harvest the way you think they are.

Several reputable growers on this very site, if I read them correctly, seem to suggest this is a myth and you never have to worry about "chemicals" in your plant after harvest. Just because you feed your plant close to harvest doesn't mean you're smoking those fertilizers straight when you hit the plant.

cyrus, how can you be sure of something when you say you don't know how it works?
If I've learned one thing about online sites, it's not to trust the reputable grower. Typically these are the people you want to avoid, because while they may be good at writing things that sound good, seldom are they correct. There's a difference between being right and just sounding like you're right.
If you can't see the over fert process taking place with those plants, then you're the one with the issue, not me.