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Re: EDTA/gluconate

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.