Plants are burning part 2

Stop immediately with the 0-40-23! Something like 0-13-14 is far more cannabis friendly. Anyway, you are so close to harvest that there will be no time to "fix" anything now.

Hey pal. That's heat stress. 29c is very high. To lower your temperature even by 1-2c will make a huge difference. Doing defol will do this. It'll make air flow thru your plant also. As the air around your plant isn't the actual temp of the leaf (it all depends on your ventilation pal) To try help with temp. You can also make it so the lights turn off at the hottest part of the day. If you not already doing this that is. Other than defol. Light changes you'll need extra ventilation or have a 180 fan blowing thru your canopy this will lower your leaf temp. Good luck

Hi there Seeing your having issues with your plants could be due to PH causing lockout so plants wont be absorbing nutrients .. Theres a grower on here thats Ace with these deficiency side of things/issues @GrowingGrannie shell point you in the right direction Best of luck 🌱

More often then not people automatically assume you need to add something to fix the problem, and in this case I don't see this being the solution, rather stop adding and not chasing and watch to see what happens over a few days is a better plan of action, you won't get the already damaged leaves to recover but the new growth will show you whats what...They're more then like locked out because of access salts and need to flushed and what is your soil PH at...I would start there and work from that after you flush with PH water..

pensa che io uso un 0-4-4 ,hai le piante piene di nutrimenti è il cal mag che manca il resto c'è n'è troppo...sciacqua bene