Hi Tip,
Sorry your plants are having trouble. I've done maybe half-a-dozen coco runs and have had a variety of problems. There's a learning curve there. I tend to agree with Pharms position, except there are some Cocos that are ground really fine and actually do get soggy. Botanicare now sells two different levels or coarseness so that people can make a choice.
I always saw nute burn on the edges first and not on the tips. So I don't know if that's correct.
What brand of coco are you using...and was it clearly marked pre-flushed to remove the salt? Man, salt left behind can cause major problems by displacing other cations like K+. But I would expect problems earlier.
I have a buddy who grows in coco and he had very good luck using AN nutes with this feeding schedule: Full strength feeding, half strength feeding followed by plain water and repeat. I never used that. I fed nutes with each daily watering though certainly not full strength.
Good luck to you...
ET
PS: I just had an idea. Collect runoff, dilute with equal amount of water, measure ppm and multiply by 2. Wouldn't that work with your meter?
dang good idea with the ppm's, would need to tally base 70 ppm into it, correct? I may have pin pointed the problem. Almost 2 embarassing. My back has been out and being a OMMP co-op grow I had one of the other growers fill in. OPS! When I watered today I noticed that the "A" bottle was less than the "B" bottle. No one is fessing up and I wish they would so to ease my mind but could be that between that and dry coco sent ppm thru the foof. F.tards anyway. Just my guess though...