The share of operating expenses devoted to energy-related inputs used in agricultural production increased during the most recent period of high energy prices, and for many crops peaked in 2008 followed by a decline in 2010 with a drop in natural gas prices.

Fertilizers (an energy-intensive input with up to 80 percent of its manufacturing cost in natural gas) are generally the largest component of farms' energy-related costs and are highest for corn, accounting for 43 percent of all operating costs in 2013.

For other major field crops, 2013 fertilizer cost shares ranged from 19 percent for cotton to 36 percent for wheat.

The Department of Energy projects diesel fuel prices to fall by 34 percent in 2015, which is expected to lower the share of energy-related production expenses for all major crops.

Reduced costs of production increase producer returns and can affect planting decisions in the aggregate, as well as cropping choices between competing crops.

For most livestock producers, energy costs are a relatively small part of production costs relative to feed costs.

This chart is based on the data available in Commodity Costs and Returns, updated December 2014.