Crop prices are heading to year’s end on a weak note, said University of Illinois agricultural economist Darrel Good.

“Corn prices are near the level that existed in the first week of January and well below the late summer highs. Soybean prices are well below the level at the start of the year and at the lowest level since early October 2010. Prices of soft red winter wheat are at the lowest level since July 2010,” he noted.

The USDA’s monthly report of U.S. and world supply and consumption prospects released on Dec. 9 underscores the reasons for the current price weakness. The 2011 U.S. corn and soybean crops were the smallest crops in three years, and the wheat crop was the smallest in five years, but foreign production of these crops was record large.

“The foreign coarse grain crop exceeded the previous record crop of a year ago by 7 percent, foreign wheat production was up by 7.3 percent, and foreign soybean production was 2.4 percent larger than the previous crop,” Good said.

Production prospects also remain favorable for the current southern hemisphere crops. Combined wheat production in Australia and Argentina is expected to be only about 2.5 percent smaller than last year’s large output. Combined corn production in South Africa, Argentina, and Brazil is expected to be 11 percent larger than that of 2011, and South American soybean production is expected to increase by 1.5 percent.

“Large crops in the rest of the world are having a negative impact on U.S. exports. U.S. wheat exports during the current marketing year that ends on May 31, 2012, are projected at 925 million bushels. That projection is 364 million bushels below the very large exports of the previous year that were generated by a small foreign wheat harvest in 2010,” he said.

U.S. corn exports for the marketing year ending Aug. 31, 2012, are projected at 1.6 billion bushels, 235 million bushels below exports of a year ago and the smallest export total in nine years.

“U.S. soybean exports are projected at 1.3 billion bushels, 201 million bushels below the record of a year ago and the smallest total in three years. In addition, a reduction in U.S. soybean meal and oil exports is expected to result in a year-over-year decline in the domestic crush of 23 million bushels,” Good said.

Weaker export demand points to slightly larger stocks of soybeans and wheat at the end of the year than at the start of the marketing year.