When trying to determine future supply and demand, the usual question marks involve producer planting decisions as well as weather conditions during spring planting and the early growing season.Grain and soy futures markets have been quietly locked into low-priced trading ranges that were established weeks ago. The fundamental pressures remain in place: large U.S. and world supplies; a record South American soybean harvest underway; another large corn harvest to follow; and excellent winter wheat conditions throughout much of the Northern Hemisphere. When all of this is matched with demand that appears to be flat or declining, the picture is not pretty, to say the least. Yet with corn, wheat and soy futures prices already so low, how much f...