Farmers plant leeks in a field in Xinghuliu Village of Chiping County in Liaocheng, east China's Shandong Province, July 6, 2018. (Photo: Xinhua)

A farmer works amid chives in a field in Gengzhang Village of Chiping County in Liaocheng, east China's Shandong Province, July 6, 2018. (Photo: Xinhua)

An agricultural vehicle works in a farm in Heihe, northeast China's Heilongjiang Province, July 6, 2018. (Photo: Xinhua)

A farmer takes care of grapes in a field in Jiagong Village of Chiping County in Liaocheng, east China's Shandong Province, July 6, 2018. (Photo: Xinhua)

An agricultural vehicle works in a farm in Heihe, northeast China's Heilongjiang Province, July 6, 2018. (Photo: Xinhua)