Corn prices slid amid forecast s for clearing weather in the U.S. Midwest, which will aid corn planting there this week. Seeding of the crop has proceeded at a slower-than-normal pace so far this year, analysts said, though rain showers are expected to taper off in the next day or two, allowing farmers to make steady planting progress. The possibility that a weekly report due from the government Monday afternoon would show better-than-expected U.S. planting progress also pressured prices, analysts said. CBOT May corn dipped 1 3/4 cents, or 0.5%, to $3.78 a bushel.