A farmer checks the growth of wheat in Ganglingcheng Village of Linzhang County, north China's Hebei Province, May 20, 2019, a day before Xiaoman. Traditional Chinese solar term Xiaoman (grain buds) falls on May 21 this year, which means seeds from grain are becoming full. (Xinhua/Hu Gaolei)

Farmers work in a wheat field at Tuanpiaozhuang Village in Zunhua City, north China's Hebei Province, May 20, 2019, a day before Xiaoman. Traditional Chinese solar term Xiaoman (grain buds) falls on May 21 this year, which means seeds from grain are becoming full. (Xinhua/Liu Mancang)