Wheat posts biggest drop in 6 months in Libya sell-off

(Reuters) - U.S. grains plunged on Tuesday, with wheat falling the most in six months, as investors bailed out of the market to reduce risk amid growing upheaval in Libya and geopolitical concerns in the Middle East and North Africa. The widespread sell-off sent wheat, corn, soybeans, rice and oats tumbling by the maximum daily trading limit as investors shifted money out of grains to other http://bit.ly/i0ifVi