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
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
good luck!!!