4/27/24 - Day 37 - Not much of a defoliator so tied some branches down + gave ~1.5L pH water (6.1)
4/28/24 - Day 38 - Got the courage to defoliate and removed some fan leaves covering bud sites & removed some small branches
4/29/24 - Day 39 - She was getting droopy and looking thirsty. Gave her 1gal. of water w/nutes. Soil was too dry, a lot of the water ran off. Added 1.5ml Micro, 5ml Bloom and 1ml cal-mag.
5/1/24 - Day 41 - She's looking happy and healthy, which makes me happy.
On multiple leaves but mostly just on a single blade, starting near the center of the blade which is strange to me. First turning pale and then to brown. Definite nute issues, I just got an EC meter and wasn't flushing until recently. PPM is pretty high so salt build up im sure.
I think you are correct in the assumption of salt build up. I think what you are seeing is a burn on the tips from too much salt and not enough water. Nick, from rooted leaf talked in depth about this and what happens is your plant is taking up salts (nutrients) constantly and sometimes you do not have enough water to go along with the salts in the tissue so they get an osmosis shock and it happens at the tips first because that if the furthest point from water. I assume that at one point within the last two weeks the soil got slightly too dry between watering and you are seeing the results of that.
As far as flushing is concerned, I do not think you need to do a flush at the moment. What I would do is mix your nutrients to a slightly lower EC and feed more for the next two watering. And by more, I mean make enough mix to allow about 20-30% run off. This will rinse out a lot of your salt build up while still proving food for your plant.
I hope this helps.
Looking good! I am currently growing the same strain, feel free to check my grow diary. Love how fast these girls are! Keep me updated and best of luck!
+1 strain
+4 strains
Critical Purple Autoflowering 
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