General Comments Corn and wheat spent the entire session trading lower, while soybeans and soymeal were higher. Corn continued to suffer a hangover from EPA's reduced biofuels mandate numbers that were released last Friday. The bearish corn story got worse when it was announced that China had apparently rejected a cargo of U.S. corn because it contained a non-approved GMO variety. Soybeans were firm following last Friday's 30+ cent price collapse and held those gains on the back of record weekly soybean export shipments that approached 90 million bushels.There wasn't much other news today and certainly none that would inspire buyers. Crude oil was down nearly $1.00 much of the day and the dollar index was lower. U.S. equity markets aga...