PO₄^-3 is the principle phosphate anion, when soil pH is

Solution (By Examveda Team)

Phosphate is an anion, salt, functional group, or ester derived from phosphoric acid. The phosphate or orthophosphate ion [PO₄]^-3 is derived from phosphoric acid by the removal of three protons.
At soil pH around or more than 9, [PO₄]^-3 is the principle phosphate ion available in the soil.