The 2012-13 corn marketing year is expected to be a transition from the current environment of tight stocks and high prices to one of a large crop, increasing stocks, and lower prices.

The March 2013 futures price, which is currently trading $0.80 to $0.85 below the March 2012 price, reflects this expectation.

According to University of Illinois agricultural economist Darrel Good, "While there is general agreement on the likely direction of production and stocks in the year ahead, there is considerable uncertainty about magnitudes."

That uncertainty starts with the likely level of stocks at the end of the current marketing year. Some light will be shed on that issue, as well as the potential size of the 2012 crop, when the USDA releases the quarterly Grain Stocks and the annual Prospective Plantings reports on March 30.

The likely level of stocks on March 1 is calculated based on the Dec. 1 stocks estimate and the estimated magnitude of consumption from December through February.

The surprising quarterly stocks estimates released over the past two years and the resulting inconsistencies in the implied magnitude of quarterly feed and residual use of corn since the spring of 2010 have complicated this calculation.

Based on the level of cumulative export inspections through February and the difference between cumulative inspections and Census Bureau export estimates through December, corn exports during the December-February quarter were near 450 million bushels.

The Census Bureau estimate of January exports will be released on March 9. The estimate of February exports will not be available until April 12.

Weekly estimates from the U.S. Energy Information Administration indicate that ethanol production during the December-February quarter was 3.7 percent larger than during the same quarter last year.

Assuming the same rate of conversion from corn to ethanol, corn used for ethanol and co-product production during the quarter is estimated at 1.3 billion bushels.