Conversion Table

Southern Ireland Classification Northern Ireland Classification Conversion
N (Nitrogen) N Same
P (Phosphate) P2O5 Multiply by 2.291
K (Potassium) K2O Multiply by 1.205
Mg (Magnesium) MgO Multiply by 1.658
S (Sulphur) SO3 Multiply by 2.5
Na (Sodium) Na2O Multiply by 1.348