Yield

Prices in the $150 billion fertilizer market are lagging behind gains in food costs, providing farmers another incentive to boost production as grains and oilseeds advance.

Urea, the most common nitrogen fertilizer, is down 33 percent from June 2008 when corn rose to a record, according to data from ICIS, a commodity-pricing company. Potash is 36 percent cheaper. Food prices gained 4.3 percent over the same period, an index of the United Nations shows.

Crops require nitrogen, phosphorus and potash for growth.

Source.

Update.