Certain plants more susceptible to light stress?

[Southernontariogrower]

Im using TDS with the base 3 GH FloraMicro FloraGro and FloraBloom and ofc calmag with RO water. Ive seen nutrient burn plenty of times just never like this. Usually starts at the tip and burns the WHOLE leaf all the way down, not in like spots. Ive ran my last 2 runs at this stage in their live around 900ppms with no problem. These are around 850. I thought the rusting was severe calcium deficiency since its RO but i added more and foliar sprayed and nothing. Now the leaves are curling up and i just dont know. Like i said i follow a VPD chart to the T so its hard to believe temp or humidity is the issue. room around 72-73 during day with a 1 degree drift at night, RH at around 52 which makes a perfect 1 on the VPD chart. Should i cut back on 850ppms? I dont wanna end up with some baby nugs this was a 25 dollar seed these clones came from lmfao

Ph?

 

[ntg908]

Ph?

i try to stay at 6 ish because a higher range of calcium, because it looks so similar i want to cover that aswell

 

[Southernontariogrower]

i try to stay at 6 ish because a higher range of calcium, because it looks so similar i want to cover that aswell

Find 6.4 good but like to feed 5.4 every week or so. Helps with uptake of iron and sulphur and such. Might have screwed up on examples but you get it right?

 

[ntg908]

Find 6.4 good but like to feed 5.4 every week or so. Helps with uptake of iron and sulphur and such. Might have screwed up on examples but you get it right?

Yeah yeah, ive heard of people going from low end to high end from week to week to cover all bases as much as possible

 

[Learning1234]

I keep my room at 80*-82* in Hempy’s with perlite/vermiculite and don’t get any rot, but maybe using Tribus helps me with that. I’d really go look at grow journals and other threads about temps with LEDs. Yours need to be higher. Do you let your ph have a swing to it? DWC let’s you have that swing pretty easily.

 

[ntg908]

I keep my room at 80*-82* in Hempy’s with perlite/vermiculite and don’t get any rot, but maybe using Tribus helps me with that. I’d really go look at grow journals and other threads about temps with LEDs. Yours need to be higher. Do you let your ph have a swing to it? DWC let’s you have that swing pretty easily.

I am doing research right now and seeing what your talking about. GH is pretty good about not swinging PH. But my question is how to do raise the temp in my room without root rotting in DWC without a chiller? with my room at 72 my res temp is 68....i never wanna go above 71 in my res or else root rot comes quick, atleast it has to me in the past before i put my AC in that room

 

[Learning1234]

Run a sterile res with the GH trio.

 

[SnidleyBluntash]

Is the last picture in you post the ‘room’ ? How big is the room ? And is that an air conditioner? That blows on the plants?

 

[ntg908]

Is the last picture in you post the ‘room’ ? How big is the room ? And is that an air conditioner? That blows on the plants?

Yes it is. The AC doesnt blow directly on them, its vented to the far right and left i made sure of that. The room is about 15'x16'