Farmers work in a grape garden in a village in Zunhua City of north China's Hebei Province, May 27, 2019. (Xinhua/Liu Mancang)

A farmer operates a machine to cultivate the soil in the soybean fields in northeast China's Heilongjiang Province, May 25, 2019. (Xinhua/Lu Wenxiang)

A farmer works in a pomegranate garden in Zaozhuang City, east China's Shandong Province, May 26, 2019. (Xinhua/Sun Zhongzhe)

A farmer operates a machine to cultivate the soil in the soybean fields in northeast China's Heilongjiang Province, May 25, 2019. (Xinhua/Lu Wenxiang)

Aerial photo taken on May 27, 2019 shows farmers harvesting wheat in fields in Guirenzhuang Village, Linyi City of east China's Shandong Province. (Xinhua/Wu Jiquan)

Farmers work in fields in Jiache Village, Qiandongnan of southwest China's Guizhou Province, May 26, 2019. (Xinhua/Luo Jinglai)

A farmer works in wheat fields in a village in Zunhua City of north China's Hebei Province, May 27, 2019. (Xinhua/Liu Mancang)