Chinese buyers booked their single biggest purchase of U.S. corn ever, extending their flurry of large purchases of American agricultural goods even as tensions between Washington and Beijing rise. The USDA said on Thursday morning that private exporters reported the sale of 1.937 million tonnes of corn to China for delivery in the 2020/21 marketing year. That topped the previous biggest deal to China of 1.762 million tonnes, reported just two weeks ago. (Reuters)