Global commodities firm Cargill Inc. and Australia’s GrainCorp Ltd. will end a grain-buying joint venture after the scrapping of Australia’s wheat export monopoly made the two competitors. Cargill will buy GrainCorp’s holding in Australian Grain Accumulation (AGA) Services for an undisclosed amount, GrainCorp said on April 3. GrainCorp will form a new grain-buying team, while