Leaves turning brown + yellow tips. What should I do? Day 49. Mephisto N.C.H. auto. in 3gal Coco.

Heat stress, light stress may account for the cupping upward of the leaves and the dead areas on the leaves. The praying leaves can be a good sign but only if the environment is stable otherwise a sign of heat and light stress. . You don't have a diary so only you know if the basics are being met. Temp, Humidity, Light, Air circulation, PH, Feeding and Watering.. The leaves may be a little dark indicating Phosphorous deficiency but the outer edges turning brown and dead spots along with papery appearance is Potassium deficiency. Good luck. At this stage temp 70-80 degrees and humidity 40-60%. Watch throwing nutes at her if you have been feeding right. A flush wouldn't hurt but don't use any nutes until she dries out and is ready again

plants are a little dark with some glossiness to them, so it's hard to say if it is lockout or a real deficiency. I'd reduce N for sure... maybe 10-20% drop and try to maintain levels of other things as best you can (unless you also choose some of the other possibilities to address below, then obvioulsy some other formula changes are in order) Could be calcium deficiency - the spots. could be an overdose of P and/or K - some chlorosis at top with skinny leaves. --- But this could also be from slightly too much light over time, too. Symptoms are not discrete. These are some potential causes of what i see, but more than one thing can cause these symptoms (indsicrete). so, did you bomb it with p/k in flower? this is a common repeated suggestion, but if already providing plenty of each all it does is cause problems? You'll need to think about your choices over the last month or 3 and go through a little trial and error. I'd suggest tacking 1 thing at at ime, so you can see whether or not your adjustment actually helped or not... then move on to the next. if you try to change several things at once, you'll never know what the exact problem was to avoid it in future as well as potentially causing new problems with unnecessary action due to wrong diagnosis. attack it systematically, and it gets easier over time... and more confident in your diagnoses.