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The iron in the Fe-EDTA complex is definitely available to plants. To
suggest otherwise is incorrect.
The reason that Fe-gluconate drops off is that the iron precipitates as
Fe+3 rather quickly and the gluconate (being a labile sugar) is digested by
bacteria and algae.
In an oxic environment "reducing agents" will not prevent the oxidation
of ferrous iron.
The charge on chelated iron is irrelevant to iron uptake.
For K deficiency it is preferable to add the K to the water column since
this is one of the elements that aquatic plants require in the water.