Combined photo shows ducks foraging in rice fields on July 17, 2018 (upper) and a farmer shows ripe rice in Gaohu Town of Jing'an County, east China's Jiangxi Province, Oct. 13, 2018. A mode of rice farming that uses ducks to eat insects and weeds in the field has been promoted in Jing'an County this year. It is an eco-friendly farming system which avoids using pesticide and fertilizer on rice while raising ducks in a natural way. (Xinhua/Xu Zhongting)