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Leaves yellowing and dying.

newbiegrowertk
newbiegrowertkstarted grow question 6 hours ago
First grow. I think I have overfed it. Feeding with normal tap water and grow/bloom nutrients with compo grow. added a single dose of pk boost. Have I killed the plant? Can it be saved? There is a lot of yellowing that i see and I thikn it will reach the buds before maturing
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Leaves. Color - Yellow
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SponGie
SponGieanswered grow question 19 minutes ago
Hi, it seems like you have a lockout, try flushing out everything with distilled water. if cant get distilled water get tap water and leave it out for 24 hours then add nothing and water make sure to adjust PH. after that leave them for about 2/3 days then give them a feed again but use half strenght and make sure oto adjust PH. let me know if this helps i went true something like this a couple times.
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Dendegrow
Dendegrowanswered grow question 43 minutes ago
They need more nutrients this is symptom of lack of p and k give more fertiliser
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001100010010011110
001100010010011110answered grow question 2 hours ago
No, but dial back the pk for sure. Despite common belief, you shouldn't just randomly boost p and k or anything else for that matter. you may need less N in mid-to-late flower, but it's better to keep the other stuff steady the entire time. I get 50-60g/sq ft with ambient co2. That's pretty much the ceiling. I don't do anything whacky with p and k. it's easier to quantify in a soilless/hydro context. e.g. 40-60ppm of P and 180-200ppm K is all you need. studies show providing more than this in a consistent way (not the same as soil fertilizer) does not increase yield or potency. P and K are in large part 'actively transported' into the plant based on need. Other things depend more on "mass flow," or basic diffusion into roots. As long as p and k exist at critical levels, the plant will grab what is needed. Overdosing in week 5 of flower or whatever elaborate process 'they' say is only going to lead to potential problems. these are things people do to feel smart but not actually based in reality. again, thos numbers are no good for 'soil' context unless you are using 100% ready/available nutrient products, aka soilless/hydro nutes in soil, which can be done, too, but isn't too common. Soil depends on rate of microbes breaking the bits down that can't enter the plant as-is. soil is different in that you rely on microbes to break fertilizer ingredients down... so the microbes must supply these similar levels plant-available molecules containing p and k around the roots at these rough concentrations. You can get there with trial and error. If the p/k you used is 100% plant ready, that's a different case... that just would need to supplement what is already being manufactured from your other fertilizer and microbes breaking it down into something that can actually enter the plant. Mixing is fine, don't get me wrong, but it all hass to add up to something similar to what is "optimal" for the plant. optimal varies by environment as far as overall concetration but ratios will be the same. so you can see why just dumping extra pk doesn't really do anything if the plant already regulates the intake based on demand. You can still overfeed. Not all of p/k enter through active transport. some signifiiacnt chunk still enters through mass flow. i cannot be sure, but due to timing, i'd wager all your problems come from either or both p and k being way too high. Can refer to mulder's chart to see what it'll lockout. that along with a leaf chart might make sense of what you see. I see a burnt up over-fed canopy. These plants are robust. This won't ruin anything completely. Will it have a negative effect? i'm sure but everything we do has to be less than "100%"... 100% is impossible to achieve so don't feel bad about it. if you plants were relatively fine before, revert back to that fertilization. Maybe even dial back for a week before you revert with water-only irrigation for a few cycles. You'll have to be honest with yourself... were the plants already getting overly dark leading into this more obvious damage? if so, the problem with fertilization was weeks ago and not just the added pk boost.
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