In Europe, fertilizers in oxide form are declared for several substances.

Use the following formulas to calculate the pure substance -> Calculation:

P2O5 to P => P2O5/2.29

K2O to K => K20/1.2

MgO to Mg => MgO/1.66

SO3 to S => SO3/2.5

CaO to Ca => CaO/1.4