Question

Foliar absorption of iron helps in rapid recovery from iron deficiency. It is sprayed in the form of

• A. $FeS{O}_4$
• B. FeCl
• C. Fe-EDTA
• D. Na-EDTA

Answer 1

Answer: (C)

Fe-EDTA

EDTA stands to denote 'Ethylene Diamine Tetra Acetic acid'. It binds metal ions. Its usefulness arises, because of its role as a hexadentate ("six toothed") ligand and chelating agent, i.e., has ability to "sequester" metal ions, such as $C{a}^{2+}$ and $F{e}^{3+}$.

After being bound by EDTA, metal ions remain in solution but exhibit diminished reactivity. Iron in such a form is highly useful for plants and can be used in case of iron deficiency.