Any ideas whats wrong

I had a similar problem last year with all my grows. Leaves would start to turn yellow in week 2 by week 6 they would be all dried up and crispy. Turns out I was underwatering in veg cycle, afraid of overwatering. The roots had stretch to the bottom looking for water and leaving very little root mass at the top and middle of the pot. When they reached the bottom they would just circle around and bind and would take over a week for the soil to dry out. If you pull on the stem like you wanted to pull the plant out of its pot, do you feel like the roots will tear right uder the stem? If so that might just be the problem. After harvesting check out root mass. The solution i found was to transplant from 1/4 gal pot to 1 gallon to 3 gal to 5 gal. Took the guessing out of watering and assured that I had enough root mass when transplanting from one pot to another. Hope this helps.

No it it is not solvable at this late stage. No it is not a cut and start again situation..........ride it out and harvest what you can. Photoperiods are easier than autos to grow, so it is something you are getting wrong. But without a diary and/or a LOT more info about what you may or may not be doing, any answers will just be a guess. My guess.............you have not been watering to run off each and every time you irrigate, which then causes a build up of nutrient salts in the soil, eventually turning it "toxic" and burning the plants growing in it. With autos and their reduced life cycle, you may get away with under watering, but with photos and an extended veg time, you do run the risk of salt build up if not watering to run off each and every time you irrigate..............but this is just a "best guess" based on long term experience.

You need to supply more info about how you water and feed them, otherwise it's impossible to properly correct! But my guess is that you messed up the pH balance på correcting pH after adding nutes and then went and destryed the microbiome in the soil by flushing. And you've probably also been feeding them incorrect nute dosages. What to do now: A. You need to make sure the pH is correct B. Then feed according to the Biobizz chart - follow the C. Feed EVERY watering D. Water with an amount of water equal to 25-33% of pot soil volume A few important Biobizz pointers: 1. You can't flush an organic grow to fix issues, it will just make things worse 2. Never pH Biobizz nutes, ONLY adjust pH of the input water to 7.0 BEFORE adding nutes - make sure you let the water get to room temperature before adjusting pH 3. If you have very hard water forget about using Biobizz without an RO filter - actually, just get an RO filter if you have hard water :) 4. Never grow with Biobizz without using Alc-a-mic 5. All-Mix is a quite hot soil blend with quite a lot of N in it - use Light-Mix instead, it's a lot easier to get right

Is that pH for your input or output? plants look like they've shifted from enjoying a hot soil mix to not enjoying it so much, perhaps as nutrient needs shifted best of luck friend, remediating soil mid-flower is a PITA realistically your options are limited, flush and take in/out metrics to really dial in where your soil is at, and hopefully the problem will present itself more clearly as you work, reintroduce slowly

if it started at the bottom and worked up, probably nitrogen deficiency, but lokos like more than one thing is out of balance here. insufficient data.... maybe k-def too.. flushing probably accelerated the problems. knowing where it starts and how it progresses helps diagnose. Most symptoms have more than one cause.