Can these plants be saved?

Sannies Jack F9, had 2 main problems with these
1. Ph was off due to meter drift, ph was low 6s for a few weeks till I discovered it
2. Fungus gnats, which can affect roots? Pretty much under control now

They are just about 12 weeks old but buds not really filling out, on half strength AN nutes

What I don’t understand is that the bottom leaves are generally ok it’s the top that are dying? So maybe it’s a lockout situation

Appreciate any help here, don’t wanna lose these plants at this late stage

Bottom leaves look like nute burn, top could be a deficiency? Im having a issue myself right now in week 8 of flower

Been giving them cal Mag?

Just had a proper look at them, leaves are clawing usually nitrogen toxicity BUT i could be wrong? Nute burn/n t could be a possibility

What are you targeting for ph normally? (You should be 5.9.-6.2 depending on medium)

I'd give them a flush ph'd water...and folliar feed with a mild cal-mag..ph'd at 7.0-7.2..(calcium absorbed at higher ph)..

Way too much N and not enough P or K by the looks of it?

Im going to say you have been low on mag and if you use an led light it washed out all the mag before it could be translocated and then it fried the top section.

Underfed, too close to the light.
pick off all the dead jacked up leaves they aint coming back and you will get the light on anything that is still good. Get environment in check try to keep it stress free and ride it out till the end.

i have been giving them some mag since flowering so it shouldn't be a magnesium deficiency? That plant with the drooping leaves is odd, have never really had that before where the leaves have not recovered, maybe it's a rootzone issue so i won't know until i chop the plant
thanks

yosim said:

i have been giving them some mag since flowering so it shouldn't be a magnesium deficiency? That plant with the drooping leaves is odd, have never really had that before where the leaves have not recovered, maybe it's a rootzone issue so i won't know until i chop the plant
thanks

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do you use an led light?

Too much nitrogen for sure and overwatered maybe?

the damaged leaves will just die off. flush with a proper ph.

Bernie420 said:

do you use an led light?

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yes I do

Bobby Long Buds said:

Too much nitrogen for sure and overwatered maybe?

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I use autopot system so they should be getting correct amount of water, everything seems to be working fine with the system water wise
I started off early in the grow with just 1/4 strength nutrients and as I got some yellowing here and there I upped the dose over the weeks to 1/2 strength - some of the leaves look really green but others are yellow and dying, very confusing to me!

Did yousever switch your nutestfrom vegging mix (high N) to a flowering mix (more P & K, little or no N)??

yosim said:

yes I do

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then what I said in post #7 is probably your problem because you ruled it out in post #8

Bernie420 said:

then what I said in post #7 is probably your problem because you ruled it out in post #8

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I'm sorry but your post didn't make any sense to me

ColoradoHighGrower said:

Did yousever switch your nutestfrom vegging mix (high N) to a flowering mix (more P & K, little or no N)??

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I just use the same flowering nutes I always use, AN Sensi Bloom

it's weird because the previous Sannie's Jack i ran was such a good plant, huge yield and little issues

yosim said:

I'm sorry but your post didn't make any sense to me

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Raise your light up, add mag. Pik off dead leaves.

Bernie420 said:

Raise your light up, add mag. Pik off dead leaves.

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why would I raise my light up? it's about 12" above the plants and I can control intensity of the light with a dimmer anyway - I have added mag during grow but this is not the problem

yosim said:

why would I raise my light up? it's about 12" above the plants and I can control intensity of the light with a dimmer anyway - I have added mag during grow but this is not the problem

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Why would you raise your light up = cuz thats what your problem is.
Its about 12" above the plants. = see above.
You can control it with a dimmer anyways = now you tell me sheeeit I wish I knew that last week.
You added mag during the grow but this is not the problem. = ok and? You ever thought that maybe that little bit of mag you added six weeks ago wasn't going to cut it for another 12 weeks?

So whats the problem then? Did you post the right pictures? Are you looking at the same pictures I am looking at?

Teach me something. If you have it figured out I want to know.

Whats the problem with your plants?