I agree with Doc... That's not light burn. It's Iron deficiency. Throw away the calmag and simply use molasses. You won't have any more problems.I think the real point is......The plants will not "recover" from that.....Bail out and restart..
That is one of the most severe IRON DEF problems I have ever seen! SO....high pH is most likely the problem!
You MUST pH your res daily at lights on to between 5.8 and 6.2 (start at 5.8 and it will rise till mourning when you retest and adjust if need be).....If you water it.....mix your feed solution and then pH to 5.8 and water the plant.....I would pH my straight water to 5.8 and then water with that on plain water days too!.......Water coco to oh say 10-15% run off at every watering and discard that....
All plants with that severe def are CASH!! Pitch them and fix the others by fixing the PH NOW!!!!
What do you use for a Ca/Mg supplement? Does it contain Iron? No? CHANGE to one that does!
G&H CALiMAGic is a good one for that!
Sorry for your loss
Doc
NOT IN COCO!I
I agree with Doc... That's not light burn. It's Iron deficiency. Throw away the calmag and simply use molasses. You won't have any more problems.
You're right bro.. It's early, didn't realise his medium was coco.NOT IN COCO!
Ca/Mg w/Iron !