Yea I know, thats quite clear....but I cant seem to stop it. Given PLENTY of nutes...no results. Suspected it was nute lockout due to ph problem, so got a tester an it says my tap water is 7.4ish and after nutes are added its 6.1ish. Runoff is 6.4ish. As far as I know that should be ok???
DM
hey doctor I had exactly the same yellowing, at the same stage, with a white strain like yours.
Turned out it wasn't nitrogen def, because I gave her plenty, nor was nutelock/PH because I flushed, nor else since the plant next to her was thriving - Well it was magnesium deficiency in the end, even if it didn't look like that much. But as soon as I gave the plant some epsom salt the problem was solved in 24h.
I may be wrong
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but I'd try some light epsom correction if I were you, shouldn't hurt the plant anyway I guess
c ya!
EDIT: I forgot to mention: I read that mag def is not uncommon among white-ish strains (White widow for example) - also if that's the case remember that the problem stops, but yellow leaves stay exactly the way they are. ...Oh and let us know if it was that or else
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good luck!!!