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

Firefly
Fireflystarted grow question 6d ago
Tips started yellowing 18 days ago. Last couple of days some leaves now have brown spots. My light cannot be raised more, was thinking it was light stress and dropped it to 80% power 2 days ago. PH in fine range, runoff EC is +600 and will flush with 1/2 strength nutes tonight.
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Fruitgrower
Fruitgroweranswered grow question 2d ago
Just back off from the feeding for a while, it's just a small excess of PK and N by the look of it too
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I_T_C_R_W___GROW
I_T_C_R_W___GROWanswered grow question 2d ago
Any News? i would say the tips are normal while growing very fast towards the heat - if it is not to hot that grows away with time (nex leafes with tips will come for that) your plant has a few hundred leafs - as long just a few have some minor marks i would not worry about it and just water one time more without anything to avoid buildup in soil, maybe they got damaged or just are really at end of life of the leaf (the plant can decide to trow a unneeded away - it gets yellow and brown and falls of during a few days) I dont see a systemic problem. post a picture of your lowest leafs near the stem, please.
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John_Kramer
John_Krameranswered grow question 5d ago
N excess and K lock P def not light/heat stress for sure ratio NPK should be 2-2.5 1 5 😎
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deepsheeba
deepsheebaanswered grow question 5d ago
I agree with ratle. Might be heat stress but if you're in the range then might be a salt build up. Check the EC of the water that comes out. If you're at 600 ppm feeding schedule you should not get more than 800-900 in the run off. Clear this problem otherwise when you gonna raise the EC they are gonna be stuck for real. Flush with only water until you get the EC's runoff close to the one of the water you are using. A rule of thumb for a flush is to water 3x the liter of the pot. 10 L pot? At least 30L water flush. Then let it dry to the point the pot feels light then feed again at 75% the dosage. Another good info. If you don't regularly runoff the advisable minimum of 10% when you feed the plant is a good idea to run at 50% less nutrients than the suggested supplier's schedule. Better be safe than sorry. Plant seems in a good shape anyway.
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Ratle
Ratleanswered grow question 6d ago
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
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00110001001001111O
00110001001001111Oanswered grow question 6d ago
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.
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