Fertilisers contain one or more

Fertilizers contain one or more Plant nutrients.
A fertilizer is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. Fertilizers enhance the growth of plants.
Fertilization focuses on three main macronutrients: nitrogen (N), phosphorus (P), and potassium (K) with the occasional addition of supplements like rock flour for micronutrients.