Indoor fan leaves yellowing

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hello afn im growing a blue mammoth auto and its in its 4th week of flower is it normal for the big fan leaves to be yellowing already im not sure about this issue if someone could please give me some advise or answer for me I would appreciate it
 
by the 4th week of flower it should be nearing the finish.. so imo its perfectly normal at this stage.

:Sharing One:
 
its only on day 50 its an 11 week plant they say so I have about 3 and a half weeks to go
 
its only on day 50 its an 11 week plant they say so I have about 3 and a half weeks to go

A picture would help. I started having yellow leaves at the bottom around day 50. I posted my question on day 54. <<link. I thought it was time to switch to the 2-week water-only "cleanse." But, was told to wait 3 weeks.

Also, when seed banks say 11 weeks it seems to be the minimum. I didn't chop until 101 days (14.4 weeks). I've got another one (same strain) at 15 weeks and it seems like it will be 3-4 more days.
 
We'll need to see some pictures of the whole plant, taken in natural light so we can see the true color of the leaves.
 
cant do pictures sorry guys but seed bank said 9 weeks and I just figured 11 to 11 and a half its been flowering for 4 weeks now I got a mostly indica strain so about 8 weeks of flower maybe 9 for the strain so im about half way there I was just hoping it was not a N deficiency but besides the yellow leaves everything looks normal the blue rlly starting to show
 
Without some pictures we're only guessing. At 50 days I would not expect to see yellowing except for the very bottom leaves that may now be shaded by the rest of the plant. If the yellowing is spreading up the plant then you may have an issue, especially if the yellowing is accompanied by any round rust spots all over the leaves, or dead/dying areas along the edges of the leaves.
 
sometimes the strain actually will finish within the seed banks projection. growing environment can affect this also.
 
well the buds are doing fine its mostly the big fan leaves a1 or 2 smaller leaves but my ph meter says 6.3 so I dnt know iv been feeding the fox farm like of nuts im kinda stumpt here ause besides the yellowing they are doing good but it still worries me ill try and get a pic on here this evening

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ya no round rust spots just yellowing and then dying off but they are doing it very slowly I read if you feed it a lot of p then it will cause your autoflowering plant to finish sooner
 
Youre gonna have some lower fan leaves die off brotha its normal. I had stuff start eitherin down below at around 50 as well just remove it when its dead and make sure new growth is ok
 
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