The form of phosphorus available to plants in acidic soils is mainly:

Correct option is C

· In acidic soils (pH < 6.5), the dominant and most available form of P is H₂PO₄⁻.
· In alkaline soils → HPO₄²⁻ dominates.
· Most P fertilizers release P initially as H₂PO₄⁻.
Why other options are wrong
· (a) HPO₄²⁻ dominates in alkaline soils.
· (b) PO₄³⁻ negligible in normal pH soils.
· (d) Organic P must mineralize first; not the primary available form.