Fertilizers

The correct option is (A) :Azolla and blue green algae.

Di-ammonium phosphate (DAP) supplies both Nitrogen (N) and Phosphorus (P) to plants and is a widely used complex fertilizer.

SSP contains approximately 16%

Required amount of SSP = kg.

Correction: Actually, the standard SSP has 16% ,
so,

if phosphorus availability is considered based on soluble/available form.