Chelate

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Metal chelate compounds are common components of fertilizers to provide micronutrients. These micronutrients (manganese, iron, zinc, copper) are required for the health of the plants. Most fertilizers contain phosphate salts that, in the absence of chelating agents, typically convert these metal ions into insoluble solids that are of no nutritional value to the plants. Chelation is a type of bonding of ions and molecules to metal ions, usually, these ligands are organic compounds and are called chelants, chelators, chelating agents, or sequestering agents.