Staff members refill antifreeze in a weighing rain gauge at Youyi Farm Co., Ltd. under Beidahuang Group in Shuangyashan City, northeast China's Heilongjiang Province, March 19, 2025. Farming activities are in full swing across Heilongjiang, China's largest grain producing province, in early spring. (Xinhua/Wang Song)

　　A farmer prepares land for sowing at a greenhouse of Youyi Farm Co., Ltd. under Beidahuang Group in Shuangyashan City, northeast China's Heilongjiang Province, March 19, 2025. Farming activities are in full swing across Heilongjiang, China's largest grain producing province, in early spring. (Xinhua/Wang Song)

　　Farmers position seedling trays and cover them with soil at a greenhouse of Youyi Farm Co., Ltd. under Beidahuang Group in Shuangyashan City, northeast China's Heilongjiang Province, March 19, 2025. Farming activities are in full swing across Heilongjiang, China's largest grain producing province, in early spring. (Xinhua/Wang Song)