Chicago | Reuters -- U.S. corn and soybean futures bounced on short-covering on Monday, after large supplies earlier knocked nearby contracts to their lowest levels in more than three years, traders said.

US grain exports face competition from South America
Net short position in soybeans increased by about 2,300 contracts
Wheat futures tested fresh contract lows
Rules "create a risk for EU food security" agriculture commissioner says
Wheat futures weaken as U.S. files sanctions against Russia
Rising stockpiles, falling Chinese demand spurred massive short in corn, soy
Corn downturn likely to keep feedlots looking to extend coverage
Soybeans followed corn lower; wheat ended mostly weaker
Discovery sets off media story despite samples testing well inside safe levels