Re: Re: chelated iron

[Luca Specchio <luckyluca at mclink_it>]

At 15.48 13/07/98 -0400, you wrote: 

>
> > >1) The FeEDTA or any other chelated micronutrients (such as Zn, Cu, Mn
> <br>
> > >etc.) can be adsorbed by plants withOUT waiting that link between EDTA
and
> <br>
> > >Fe is broken? I suppose they can.
> <br>
> <br>
> Someone once told me that the process involved when plant roots get
nutrients
>
> <br>
> from substrate binding sites is called adsorption (with a "d"). As I
> remember, 
> <br>
> the root trades an ion (or proton?) that it has for a nutirient ion like
> NH4++.
> <br>
> <br>
> Do plants get chelated ions the same way?  Trade something for the the Fe++
> ion 
> <br>
> in the chelator, for example?


Well... I don't really know... all what I Know id that in TOA Horst wrote that
plants can uptake chelated iron and break the link inside the leaves cells.
But
nothing is told about the effective rate of this  uptake and, above all, which
is the differential rate between the adsorption of chelated iron compared with
ferrous iron.

Sincerely,
Luca Specchio
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