The CBOT was called to open mostly lower (except wheat, which was called higher) with the advancing South American soybean harvests and ongoing biofuels demand destruction in the U.S. working against futures. The markets opened as called and generally traded a quiet day, with corn posting a new contract low and soybeans and wheat finding some support.  With corn futures hitting new lows and entering deeply technically oversold territory, there are many beginning to wonder if a corrective bound is overdue. Support is certainly likely to be uncovered near the $3/bushel mark for May corn and $3.25 for December. The long-term outlook for corn (and to a lesser extent soybeans) is bearish but oversold markets often need a correction to cool...