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Re: chelated iron

Steve Pushak wrote............

>You could argue that they were
>operating on stored iron reserves but the proof of that would be just to
>wait long enough to observe a reduction in growth rates. Surely that
>would not endanger the health of the aquarium plants.

In a plant, iron is mostly insoluble as Fe(III).  It is immobile.  Iron
reserves would not be contained within the plant.  That is why deficiency
symptoms appear first on the young leaves.  Iron is needed as a co-factor in
the synthesis of chlorophyll.  Since the iron in the older leaves _cannot_
be mobilized, in a deficiency situation the young leaves are those which
suffer the physiological consequences (chlorosis and reduction in growth).