US corn tumbles on liquidation as crude surges

* Corn posts sharp reversal after near 32-month high * Soybeans up as rains slow early Brazil harvest * Wheat erases early gains as corn sags By Julie Ingwersen CHICAGO, March 2 (Reuters) - U.S. corn futures fell 1.8percent on Wednesday, their biggest drop since a limit-downplunge last week, as a surge in U.S. crude oil promptedinvestors to curb risk by selling long positions.

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