The Ethanol Decade: An Expansion of U.S. Corn Production, 2000-09
by
Steve Wallander,
Roger Claassen, and
Cynthia NickersonEconomic Information Bulletin No. (EIB-79) 22 pp, August 2011
As annual U.S. ethanol production increased 9 billion gallons
between 2000 and 2009, demand for the feedstock used to produce
ethanol also increased. In the United States, corn is the primary
feedstock for ethanol production, and harvested corn acreage
increased by roughly 10 percent (7.2 million acres) over the same
period, with much of the change occurring in 2006-08. The
environmental and economic implications of such a large shift in
land use depend largely on where these additional corn acres are
located. In this study, we analyze data from a special bioenergy
survey of farm operators to determine, for the first time, how
farm-level land-use decisions affected corn supplies and competing
crops.
What Did the Study Find?
As farmers react to price changes for commodities they can
produce on their farms, adjustments in land-use decisions can be
complex. Not only do land-use decisions by individual farmers
reflect the relative productivity of farmland for specific crops,
but price expectations can differ from one operator to the next and
decisions can change from year-to-year as new expectations are
formed. Increased demand for corn, attributed to bioenergy policies
and other market conditions during 2000-09, resulted in a complex
array of cropping pattern changes.
• Corn production expanded between 2000 and 2009 due partly to
an increase in corn acreage relative to historic levels and partly
to an increase in corn yields.
• Crop acreage shifts at the farm level indicate complex market
adjustments between 2006 and 2008:
- Farms specializing in soybeans in 2006 accounted for most of
the increase in corn acreage;
- Farms shifting from other crops into soybeans offset the shift
from soybeans to corn; and
- Some farms reduced corn acreage, while other farms expanded
soybean and corn acreage simultaneously.
• Expanding total acreage in major cultivated crops on corn and
soybean farms also increased corn and soybean acreage:
- The average shift from hay, USDA Conservation Reserve Program,
or grazing land into cultivated cropland accounted for about a
third of the average increase in harvested crop acreage, mostly
from hay; and
- Double cropping (consecutively producing two crops of either
like or unlike commodities on the same land within the same year)
and a reduction in idled cropland also expanded harvested crop
acreage.
How Was the Study Conducted?
This report examines the expansion in U.S. corn production
between 2000 and 2009, but focuses specifically on farm-level
evidence for 2006-08-a period of dramatic corn price increases.
Higher corn prices (relative to alternative crop prices) stimulated
increased corn production. Analyzing farm-level survey data allows
us to determine the relative scale and sources of cropland
expansion. The farm-level data were drawn from a special version of
the 2008 Agricultural Resources Management Survey (ARMS) that
sampled corn and soybean farmers simultaneously. Corn and soybeans
are often grown in rotation, so targeting producers of both crops
provides a full representation of joint production for both crops.
The ARMS is a detailed, annual survey of farm businesses and
associated households conducted jointly by the U.S. Department of
Agriculture's Economic Research Service (ERS) and National
Agricultural Statistics Service (NASS). We investigated the changes
in aggregate crop acreages between 2000 and 2009 by using annual
crop production summaries and the 1997, 2002, and 2007 Agricultural
Censuses.