Corn lost ground with losses in wheat and soybeans. Some analysts expect the first weekly corn crop ratings of this season to reach record highs. We doubt that, based on too much rain in some areas, cold weather and some frost/freezes. General Comments Markets were firm overnight, led again by the wheat markets. The start of today's trading session, however, brought sellers and not buyers. This selling was attributed to a sharp change in direction of the U.S. dollar, which was weak early but rose to new three-week highs today. This is the first three-day holiday weekend of the summer in the U.S. Markets will be closed until 8 p.m. (EDT) Monday evening in observance of Memorial Day. We are already in somewhat of a weather market, at least...