Quote:
Originally Posted by Stvrob
The purpose of the chelate anion is to surround an iron cation and allow it to be soluble at pH and redox conditions in which it would otherwise be insoluble.
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Right, but there are factors that determine the stability of any chelate in soil.
This article explains it pretty well.
Iron Nutrition in Plants
AMINO ACID CHELATES—GIVING YOUR PLANTS A HELPING HAND