Fertilisers are added to increase a soils

Fertilizers are added to increase soil Fertility.
Fertilizer is a material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. Fertilizers may be distinct from liming materials or other non-nutrient soil amendments.
Farmers apply these fertilizers in a variety of ways, through dry or pelletized or liquid application processes, using large agricultural equipment or hand tool methods.