Detail from the front of the CBOT building in Chicago. (Vito Palmisano/iStock/Getty Images)

U.S. grains: Wheat sags to 3-1/2-year low

Corn, soy firm ahead of USDA data

Reading Time: 2 minutes Chicago Board of Trade (CBOT) wheat futures ended mostly lower on Thursday with the benchmark contract Wv1 tumbling to a fresh 3-1/2-year low late in the session after China cancelled a purchase of U.S. wheat and Egypt scrapped an international purchase tender, traders said.