A farmer operates a seeding machine at a farm in Maxwell, Iowa, the United States, on May 14, 2026. Iowa, a state in the middle of the United States, is an essential agricultural region that produces corns, soybeans, meat, eggs and so on. It is known as a granary of the country. (Xinhua/Zhang Fengguo)

This photo taken on May 11, 2026 shows corn seedlings at a farm in Atlantic, Iowa, the United States. Iowa, a state in the middle of the United States, is an essential agricultural region that produces corns, soybeans, meat, eggs and so on. It is known as a granary of the country. (Xinhua/Zhang Fengguo)

A farmer operates a seeding machine at a farm in Maxwell, Iowa, the United States, on May 14, 2026. Iowa, a state in the middle of the United States, is an essential agricultural region that produces corns, soybeans, meat, eggs and so on. It is known as a granary of the country. (Xinhua/Zhang Fengguo)

This photo taken on May 11, 2026 shows granaries in Atlantic, Iowa, the United States. Iowa, a state in the middle of the United States, is an essential agricultural region that produces corns, soybeans, meat, eggs and so on. It is known as a granary of the country. (Xinhua/Zhang Fengguo)

A farmer operates a machine clearing weeds at a farm in Maxwell, Iowa, the United States, on May 14, 2026. Iowa, a state in the middle of the United States, is an essential agricultural region that produces corns, soybeans, meat, eggs and so on. It is known as a granary of the country. (Xinhua/Zhang Fengguo)

A farmworker operates a forklift carrying forage grass in Manning, Iowa, the United States, on May 12, 2026. Iowa, a state in the middle of the United States, is an essential agricultural region that produces corns, soybeans, meat, eggs and so on. It is known as a granary of the country. (Xinhua/Zhang Fengguo)

A farmer loads a seeding machine with seeds at a farm in Maxwell, Iowa, the United States, on May 14, 2026. Iowa, a state in the middle of the United States, is an essential agricultural region that produces corns, soybeans, meat, eggs and so on. It is known as a granary of the country. (Xinhua/Zhang Fengguo)