An unmanned tractor with Beidou navigation system installed works on a paddy field at an intelligent agriculture demonstration zone in Tawan Village of Litong District, Wuzhong City, northwest China's Ningxia Hui Autonomous Region, April 9, 2020. In recent years, local authority of Litong District in Wuzhong City has stepped up great efforts to develop the intelligent agriculture, as a way to improve the efficiency and lower the cost of production. (Xinhua/Feng Kaihua)
