Tip burn on autos going into flower

Hello there I would say too much nutrients you have to give half the recommendation on the bottle for auto as they don’t need as much nutrients maybe a flawless Finnish flush and ph perfect water the burnt tips will not go but you should see nice new growth hope this helps 👌looks good any how buddy best of luck to you 👌👍

Seems like it might be led burns? How far is ur light?

Zu viel Dünger. Wenn die Pflanze zu viel Dünger bekommt macht Sie das bemerkbar indem die Blätter spitzen anbrennen, so wie in deinem Foto.

Leaves don’t magically turn from yellow back to green, you did your flush, and are back on schedule and pay attention to new growth. Unless u start seeing new issues get it back on course with the others.

My guess is your nutrients weren't fully fully blended and mixed together. This is probably the first plant that was watered or the last from your water jug etc .. probabaly just got the strongest ppm dose of them all .

Verifie ton ph. Tu a une carence en mironutriments einc entre autre. Et pas un excès. Ajoute acid fulvic et Calmag ajuste ta fertilisation. Support coco est inerte et oxygéné donc tu peux augmenter la fertilisation

I am growing og Kush auto and have had exactly the same problem at around 4 to 5 week they just seemed to go through a phase and there was nothing I could do about it but I just carried on as normal and they just seemed to get through it. I did change my lighting to 12/12 at 6 and half weeks because I had other plants that were not Autos and needed switching. My Autos are still going and are looking great and they are 10 and half weeks now

If you want to guess, stab blindly. Great thing about soilless is that you can take a bit more control and know more precisely what you are providing. Checking pH of what you add to the substrate and guaging pH of the substrate, the latter is more art due to context and likely tools at home, should be the first step of any potential nutrient issue. Being aware of any environmental changes, also important, which you look to have covered. if pH is swinging without any major microbial issues, i'd reconsider the integrity of the "ph perfect" claim. A well-buffered nute mix shouldn't swing except due to some non-beneficial microbes wreaking havoc. use a nutrient PPM calculator. you are in soilless so this is even more useful for you and hydro growers than soil growers. we provide 100% of what the plant needs. The link below will cover any labels requiring a specific gravity calculation. You can also download my spreadsheet which will be much faster to use, but may or may not properly calculate for specific gravity.. check teh website below, i always get it backward.. athink w/w% requires it? Your guaranteed analysis label should show the metric used, and if not... that's another big red flag for that brand. they got it in red text at top in the link below which is which. could check it against mine and if it is proper, it's easier to type each nute you use into the spreadsheet all at once than re-do the process each time with the manic botanix calculator and manuallly add it up. the spreadsheet tabulates everything real-time for you as long as you stick to only editing yellow cells (and have teh spreadsheet setting 'autocalculate' enabled). non macros in it... perfectly safe. google drive link in my GD profile comment section. but you'll want to use this one first for anything that needs specific gravity... really, once you do this once and then maybe as you slowly adjust it to your garden, the changes relative to any 1 oddball plant will becomes so small it won't be necessary to recalculate in perpetuity. https://manicbotanix.com/calculators/ppm-in-solution-calc.php A good balance at about 750 total ppm is all you need, and can play mad scientist from there over time, if you want to. NPK should be in vicinity of 120-130s / 50s / 190-210ish. May have some variance due to pH differences, but it's a good ballpark for the primaries. You can reference any of my diaries for a table of ppm of my mixed nutes. Tap water used will impact Ca/Mg needs, so the numbers i have are less useful for any other individual, but the npk should be fairly consistent given a near 6-6.2 pH. i'd suggest you don't need to buy a product like "recharge" and be less willing to flush the plant unless there is a major, fast moving problem you are certain is a toxicity. Otherwise, you are potentiall exacerbating a problem and leeching way perfectly good nutes. Flushing is a serious thing in soilless... you typical feed ondemand, so a flush can have a larger impact than in soil. it is a useful tool for very specific contexts mostly involving impending catastrophe i promise if you stick to a near-1.5EC (750ppm, well-balanced that you will find with trial and error) and religiously get 10% runoff or more, you will never have a buildup of nutrients in your medium to any unsafe level, even during dryback. you will never need to flush unless a mistake is made or an act of god occurs. the ppms are ballpark ideas and even larger ballpark for ca/mg. trace stuff should be in any reputable hydro nutrient line - only need it in one of the products. i'm not a fan of AN. if you can get jacks 5-12-26 nearby, look into it. it's a properly pH buffered product and yo don't pay for a lot of water weight. buy in bulk and you'll be buying nutes every 3-5 years for a small to medium-sized garden. it's dry, so it'll last decades. i'm not a fan of marijuana branded nutrient lines.. they tend to be overpriced products with ingredients that are extremely cheap. Don't pay for a name or something that is "for marijuana" cause the product probably exists but 1/10th the cost without the kids-cereal-like cartoon graphic on the front.

Yeah after reading Robert's. N def usually starts making the older growth leafs turn a yellow first by sucking N out of them. Your plant is uniformed in def. Only thing I can say is that I've heard some stories about that B auto. It makes PPM swing like crazy, and also look into growing in soil. Recharge works best when in soil. But for now increase your dose. Look to new growth for signs of def still, not old. Good luck!

I agree with Roberts

It is 1 of 2 things. Your ph in the coco is drifting into a lock out range or did. Or she wants more potassium.