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nutrients and chelants logic

Dear group,

Just some more Q on chelants and nutrients in general.

1) The FeEDTA or any other chelated micronutrients (such as Zn, Cu, Mn
etc.) can be adsorbed by plants withOUT waiting that link between EDTA and
Fe is broken? I supposed they canNOT but I think I was wrong.

2) I think most of the iron tests canNOT "read" the presence of chelated
iron into the water, so what I read is the total amount of ferrous plus
ferric ions. Is it right?

3) But I also know that with concentration of oxygen greater than 1ppm all
the iron in water is in its ferric form, that should not be very easily
uptaken by plants.

so if they can't uptake nor the chelated iron neither the ferric one, for
which iron concentration should we go for? and of what... chelated, ferrous
or ferric?

This last point - I think - it's particularly important because if we
consider PO4-- as the limiting nutrient in water column we should be sure
that there is enough iron to guarante that all the phosphates available are
taken quickly by plants.

Thanks very much for your help.

Luca Specchio

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