The contribution of fertilisers to increase in food production is

The contribution of fertilizers to the increase in food production is 50%.
A fertilizer is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients.
Increased use of nitrogen fertilizers has been a crucial component of the increased productivity of conventional food systems (more than 30% per capita) as part of the so-called "Green Revolution".
This transition was important in transforming the global food system, allowing for larger-scale industrial agriculture with large crop yields.