The contribution of fertilisers to increase in food production is

The contribution of fertilizers to the increase in food production is 50%. Commercial fertilizer is responsible for 40 - 60% of the world's food production.
Fertilizers replace the nutrients that crops take from the soil to produce fruits and cereals etc.
Fertilizers provide crops with nutrients like potassium, phosphorus, nitrogen Sulphur, etc. which allow crops to grow bigger, faster and produce more food.