CHICAGO: U.S. corn futures were narrowly lower on Thursday, pressured by technical selling even as the potential for planting delays due to rain and frost in the Midwest continued to underpin prices, traders said.

Benchmark Chicago Board of Trade May corn futures eased for the second straight session as investors took profits following the rise to a seven-month high on Wednesday.

The U.S. Agriculture Department reported export sales of U.S. corn in the latest week at 658,700 tonnes for 2013-14 and 58,000 tonnes for 2013-14, below trade expectations.

Brazil's government supply agency raised its estimate of the country's 2013-14 corn harvest to 75.46 million tonnes, from 75.18 million last month.