Staff members measure the yields of a new super hybrid rice variety, May 9. (Photo courtesy of the Sanya branch of China National Seed Group Co., Ltd.)

Staff members bag the yields of a new super hybrid rice variety, May 9. (Photo courtesy of the Sanya branch of China National Seed Group Co., Ltd.)

Photo shows a combine harvester harvesting the crops of a new super hybrid rice variety. (Photo courtesy of the Sanya branch of China National Seed Group Co., Ltd.)

Photo shows rice ears of a new super hybrid rice variety planted in Sanya, south China's Hainan province. (Photo courtesy of the Sanya branch of China National Seed Group Co., Ltd.)

The Sanya Paddy Field National Park (Photo courtesy of the Sanya branch of China National Seed Group Co., Ltd.)