
CHICAGO, Dec 12 (Reuters) - Chicago Board of Trade corn futures ended lower on Friday on chart-related selling, ample global grain supplies and spillover weakness from soybeans, traders said.
CBOT March corn CH26 settled down 5-3/4 cents at $4.40-3/4 per bushel, dropping back below its 50-day moving average for the first time since November 26.
The March contract CH26 was unable all week to break through overhead resistance at $4.50 a bushel, a bearish technical signal.
For the week, the CBOT March contract fell 4 cents a bushel or 0.9%.
Argentina's government formalized a cut to export taxes on grains by publishing the measure in the official gazette.
A massive wheat harvest in Argentina threatens to compete with corn as a feed grain. The Rosario Grains Exchange raised its estimate of Argentina's 2025/26 wheat harvest this week to a record 27.7 million metric tons.
Traders shrugged off support from news that the U.S. Department of Agriculture (USDA) confirmed sales of 250,000 metric tons of U.S. corn to undisclosed destinations.
Ahead of backdated export sales data due from the USDA on Monday, traders expect the agency to report export sales of U.S. corn in the week ended November 20 at 1.1 million to 2.2 million metric tons.