The CBOT opened higher with support coming from USDA daily “flash” export sales announcements. Corn and soybeans started to weaken by mid-morning, however, and finished the day with a relatively lackluster performance. Wheat, on the other hand, posted another day of double-digit gains as commercial and speculative buying was heavy. For corn and the soy complex, choppy trade yesterday and today suggests tops are near, or at least the restart of sideways trade. Wheat seems to be the exception, as the market strength shows no signs of slowing down or forming a top.  The U.S. weather pattern is trending wetter heading into the second week of September and the upcoming WASDE report. That will likely cap rallies in corn and soyb...