BEIJING, May 23 (Reuters) - China's imports of sorghum rose sharply in April from a year earlier, customs data showed on Wednesday, as buyers brought in large volumes of the feed grain ahead of Beijing's anti-dumping decision made at the peak of Sino-U.S. trade tensions.

China imported 640,000 tonnes of sorghum in April, up 87 percent on a year ago, ahead of a huge anti-dumping deposit announced by Beijing on April 17 after a two-month investigation. The country imports almost all of its sorghum from the United States.