Bloomberg: Corn fell for the first time in four sessions on speculation that global demand is declining faster than drought is damaging crops in South America. Worldwide corn reserves will total 136.7 million metric tons at the end of September, up 7 percent from a year earlier, the U.S. Department of Agriculture said today. Global output will be 786.5 million tons, down 0.6 percent from a January forecast, the agency said, citing smaller South American crops. Demand will reach 777.5 million …