Wheat, Corn, Soybeans Tumble as Japan Disaster Reduces Demand

March 15 (Bloomberg) -- Wheat fell to a four-month low, and corn and soybeans tumbled on concern that the earthquake and nuclear crisis in Japan will reduce raw-material demand. Equities in Japan had the biggest two-day drop since the 1987 crash as the risk of radiation leaks north of Tokyo escalated. U.S. Treasuries surged. Japan is the world's leading buyer of corn, the third-largest importer

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