Heavy weekend rains for parts of South America took away a pillar of bullish support and sparked aggressive selling at the CBOT on Monday. March corn posted a new contract high overnight but could not hold gains and soybeans were once again stymied at the $12.00 level. The day session saw soybeans and corn fall sharply on better South American forecasts and profit taking and position liquidation became rampant. Last week’s bearish technical developments in wheat futures already had the market on edge and the aggressive selling in corn and soybeans added fuel to the position-liquidation fire. Overall, the CBOT had the feeling it was shaking out weak longs and rumors of Chinese interest in U.S. corn were thoroughly ignored.  Weekl...