Re: [APD] Ferrous or Chelated Iron?

["S. Hieber" <shieber at yahoo_com>]

My understanding is that iron present as ferric is not
"unavailable" but that more work is involved, so to speak,
for the plants to make use of it. 

Chelators prevent oxidation while they last but, chelators
break down -- some faster than others. They do retard the
process.

sh

--- Raj <ggrk at blr_vsnl.net.in> wrote:

> Chas,
> 
>          Chelated iron breaks down slowly and free iron
> is available to plants
> in smaller quantity over a longer time. Ferrous iron
> quickly oxidizes to Ferric
> state and becomes unavailable to plants. Chelation
> prevents this oxidation
> in a manner of speaking.
> 
>          Some more info from Eriks site:
> 
>          http://www.thekrib.com/Chemistry/fe.html
> 
>         
> http://www.thekrib.com/Plants/Fertilizer/flourish.html
> 
>

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