The use of crops to produce bio-fuels is adding to fertilizer demand. 

Bio-fuels are substitutes for petrol and diesel made from plants. High oil prices and a desire for greater energy self sufficiency has resulted in several countries encouraging the development and uptake of bio-fuels through policy mWhilst total fertilizer use on bio-fuel crops is relatively small, it is new high intensity demand and additional to the strong growth in fertilizer demand for traditional food and fibre crops. 

In 2011 the International Fertilizer Industry Association (IFA) estimated that 3.6% of fertilizer demand was due to bio-fuel crops. ( 
easures such as subsidies, tax relief and mandated targets.