NPK summarises part of a fertiliser’s declared composition. Under the usual labelling convention, the numbers appear in the order nitrogen (N), phosphorus expressed as P₂O₅ and potassium expressed as K₂O. They are not a dose or a recommendation for every crop.
Always read the units. A w/w percentage expresses an amount relative to product mass; a w/v percentage expresses it relative to volume. Do not interchange these bases or compare figures without checking how they are declared.
The abbreviated formula does not contain all the information. The label or data sheet may specify nitrogen forms, solubilities, secondary nutrients, micronutrients and other components. Keep their names and units when comparing products.
A higher number does not automatically make a product the best choice. Selection should reflect crop needs, application method and field conditions, while following the formulation documentation.
Before asking for advice, identify the exact reference and what you want to compare: concentration, nutrient form, foliar or root application, or stated dose. PFS catalogue sheets bring together the data for each formulation; for on-demand references, request their specific documentation.
General information. Product and dose selection requires crop diagnosis and documentation for the specific formulation.