I have 4 purple kush in week 5 of flower and they have started to show issues; using advanced nutrients grow bloom micro big bud b52 and bud candy with the auto pot system and buds are huge and growing but fan leaves are going necrotic for the second time at the same time in flower week 5. Ppm sits around 900-1000 and ph is around 6-6.2 all the time. Wondering if I am feeding to little 2ml/l of 3 base nutrients and 2ml/l of all others like the bottles say. Was told to not venture over 1100ppm so very torn with using the bases at 4ml/L … Help! 2 weeks before necrosis and today
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First welcome to the community my first thoughts looking at the pictures. I would start by getting me a fresh clean bottle of 7 pH solution and verifying my pH meter. And make adjustments from there if needed. I can see a little nute burn but the foliage is showing more issues.
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IMHO
Nutrient burn, pH imbalance, or element imbalance (too much P/ nutrient lockout), pick one.
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Same thing hapened to me on my first grow with Advanced Nutrients. Yours looks just like my first plant. AN is too strong IMO. I never used them again, and never had an issue like burnt looking plants. Advanced Nutrients lights my fire and I can’t trash them enough… SHEW…I feel better…rant over. Switched to Dyna-Gro. Not popular, but it’s simple and puts out good bud.
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In the first week of flower I had a thrip problem I solved but some of the spots from the thrips turned brown not to worried there but the burning tips is what worries me; all nutes adjusted to 800ppm and no ph pen anymore my plant watcher dropped it in the Rez so back to ph paper range 5.8-7.0 so quite accurate switching to Gaia green next time just wanted some input on if anyone else had this
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What media in the autopots? Are you running cal mag as that is my first thought: calcium. You are better off replacing your digital PH meter ASAP as strips are far less accurate.
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Peat (pro-mix) and pearlite and I used reverse osmosis water so i add 80ml of cal mag to the water and I want a new pen but they are pricey also cal-mag bottle doesn’t have very good guidelines for use so not sure if I’m using the proper amount
In how much water? That’s a lot of cal mag. I am doing 5 ml per gallon with Gringo Rasta (FF)
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40L of water 2ml/L of cal mag
Same here 5ml calmag with gringo Rasta line.
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@EclecticJack I like Dyna Gro I’ve used other products but I always go back to Dyna Gro. It’s simple easy to adjust the pH with and gets the job done .
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I figured out why my plants burnt… I learnt a good lesson today in ppm VS EC and PSA: not all Tds /ppm pens are created with the same standard!! My tds pen 800 ppm = 1.8 EC and wait for it wait for it … I was at 1500ppm 
By ratio my EC would have been around 3.3 which is like two times to high… got Remo nutrients for the next run and going to lower my ec a bit more to rehydrate the plants! To high of salinity prevents the natural osmosis of the roots!! Just going to ride it out for the last three weeks…
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