Markets reopened this morning after the Christmas holiday with the same lack of enthusiasm that prevailed last week. There was little by way of fresh news over the long weekend, so markets started out looking at South American weather and the potential for below-zero temperature readings over the central and southern Plains by the end of this week with very little snow cover. Some beneficial rains fell over cropping areas in Argentina late last week with scattered lighter showers slated for today. Thereafter, the forecast calls for a return of dry conditions along with increasingly hot temperatures over southern Brazil and Argentina. Longer-range outlooks indicate that dryness will prevail over this region as well as northern Brazil for mos...