Nute burn problems

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:toke: what dosage are you feeding at? Some of those lowers are yellowing out normally, mainly getting tapped for N and P,...but more than they should at this stage.
Also, you are growing in straight coco + perlite, right? If you're not running it like coco should be, troubles are just starting, coco can't be treated like true soil, it won't work well at all,... coco is a soilless medium, with a lot of do's and don'ts that other soilless don't have to worry about.. Coco has an odd cation exchange capacity (CEC), which makes it a real Ca hog, Mg to a lesser extent,... in many ways, it's treated more like hydro than soil.. typically you run-15-20+% run-off each feeding, to prevent nute salt build-up and off pH,... coco breathes really well, so it's harder to water-log it, another reason you can cycle nutes in and out faster..... So, it may be that you have this problem now, build-up that's making her bitchy about feeds,...
You need to do a flush, which is also done differently that with any other medium, or risk screwing up that CEC balance in there further,... good that you were using Ca-Mg though!
Always, you need to monitor your input pH and TDS/EC going in, and going out as run-off,... it's a pain, but that's coco hand-watering for you- :doh:
Do you have a TDS/EC meter? Get one, it's all guess work otherwise, and that with coco doesn't end well usually,...
flush solution recommendation is RO/Di water, with 150ppm Ca-Mg, plus another 150ppm of nutes, pH to 6.0, and poured through until runoff is at or near input values,.... then let her dry a bit, and start reg. feeds again,....
 
So previously I had been measuring pH with cheap test kits weekly but I just ordered a proper pH/TDS/EC meter. Also for the first 4 weeks I had been consistently watering until runoff, so maybe it could be a long term salt build up problem? It's just strange it happened well after I started watering her correctly, and once I noticed a bit of nute burn I did a few RO flushes and really dialed the nutes down from 5 ml per gallon to 2 ml. Also the northern lights I'm growing next to her doesn't seem to have a single problem with anyrhing I give her, but I guess that's the difference between some strains. It is just straight coco and perlite so I'll just take your advice and flush her with some more weakly nuted RO and see how she takes it. Thank you!
 
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