I agree with whoever said overnute problem if ph is normal (5.7 is perfect if you've been keeping it stable.) 84 degrees isn't going to do that to your plants unless you put something on them like an antifungal or spray or something and didn't pull back your lights. I'm guessing overnute...
i must say....and not trying to be rude....it really amazes how many people won't bother with or refuse to check and follow something as simple and important as water and soil ph.
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If your runoff is low.....and the water going in is normal.....the issue is in your soil.
I don't consider 5.7 an ok ph for growing in soil. It should be 6.2-6.8.....both the water and the soil runoff.
Growgirl, yes flush.....I like the idea of flushing with 7.0 water but I wouldn't go above...
Yes.....drop your ph to 5.6-6.0 and don't let it wander outside that range. i think your problems will go away if you do. What kind of nutes are you using and how many ppms?
You're welcome....next time you water them. give them 1/4 strength dose of nutes in ph correct water and see what they do with it. If they act happy (and I think they will) you can work the nutes up slowly from there.
PS....SLOWLY is your key here....its ALOT harder to fix nute burn in a plant...
That is probably a good idea.....flush with ph correct water and check the ph of the runoff coming out the bottom.....make sure they are the same (if not...flush until they are).
Good luck. :)
If you are growing in rockwool....your ph should be between 5.6-6.0. I have a feeling your ph is too much on the edge and you are locking out nutes. Drop it to the above number if the media you are growing in is not soil.