chemical compounds that keep plant nutrients [usually iron (Fe)] soluble and available plant absorption over a broad range of pH.

chelates (Wikipedia)

Chelation (US: /kˈlʃən/, UK: /ɪ-/) is a type of bonding of ions and molecules to metal ions. It involves the formation or presence of two or more separate coordinate bonds between a polydentate (multiple bonded) ligand and a single central atom. These ligands are called chelants, chelators, chelating agents, or sequestering agents. They are usually[clarification needed]organic compounds.

Chelation is useful in applications such as providing nutritional supplements, in chelation therapy to remove toxic metals from the body, as contrast agents in MRI scanning, in manufacturing using homogeneous catalysts, in chemical water treatment to assist in the removal of metals, and in fertilizers.

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