Agriculture Online: It’s been awfully dry in South American soybean and corn country. USDA on Tuesday confirmed the drought down south has taken a toll on the region’s crops and, in turn, soybean and corn supplies in the world market. Will this translate to a shift in acres in the U.S. this spring? The soybean crop took the biggest hit in Argentina, where overall production is pegged at 43.8 million tons. That’s down 5.7 million tons from a month ago “as drought conditions and heat in the central growing …