Why do my new leaves turn yellow after a few days.

jafooli said:

Ok hope it helps also have you flushed at all? It will help if you flush plants thru with just plain water phed. Then start feeding normal in a few days

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I haven't flushed since the start of the problem which was a few weeks ago.

jafooli said:

just my opinion but ph 5.0 is way to low, this will do damage to the plants same as if the ph is 6.1 or higher, will get all sorts of nute lockouts

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u could be right but its been my personal experience that the ph can swing up or down over the course of a day and keeping the ph at 5.7 might be more work than its worth. besides that there are some nutes that get locked out at 5.0 but there are others that are only or best absorbed at levels below 5.5