A staff member maintains the navigation system of an autonomous seeding machine 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. (Photo: Xinhua)

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. (Photo: Xinhua)

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. (Photo: Xinhua)

A staff member prepares the seedbed 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. (Photo: Xinhua)