BEIJING, Dec. 18, 2020 Staff members measure an experimental demonstration field in Hengnan County, central China's Hunan Province, Nov. 2, 2020. The third-generation hybrid rice developed by Yuan Longping, the ''father of hybrid rice,'' and his team achieved a yield of 911.7 kg per mu (about 667 square meters) in an experiment in central China's Hunan Province. Plus an early season rice yield of 619.06 kg, the same plot in Qingzhu Village, Hengnan County, has produced a yield of 1,530.76 kg per mu in a year. The output is equivalent to 22.96 tonnes per hectare. (Credit Image: © Chen Zeguo/Xinhua via ZUMA Press)