COMMERCIAL barge traffic on southern reaches of the Mississippi River was at a standstill as low water levels halted shipments of grain, fertiliser and other commodities, Reuters reports. This comes as harvesting of corn and soybeans, the largest US cash crops, is ramping up and demand for food and fuel have sent inflation soaring. Around 100 tow boats hauling some 1,600 barges were lined up for miles waiting to pass through one trouble spot near Lake Providence, Louisiana, that has been mostly...