Aerial photo taken on June 6, 2021 shows wheat-reaping harvesters at work in Zhoukou, central China's Henan Province. Farmers have been busy with summer harvesting activities in Henan Province, a major wheat producing area. (Xinhua/Li Jianan)

Photo taken with a drone on June 5, 2021 shows wheat-reaping harvesters at work in Zhoukou, central China's Henan Province. Farmers have been busy with summer harvesting activities in Henan Province, a major wheat producing area. (Xinhua/Li Jianan)

Farmers operate harvesters in a wheat field in Zhoukou, central China's Henan Province, June 6, 2021. Farmers have been busy with summer harvesting activities in Henan Province, a major wheat producing area. (Xinhua/Li Jianan）

Farmers operate harvesters in a wheat field in Zhoukou, central China's Henan Province, June 6, 2021. Farmers have been busy with summer harvesting activities in Henan Province, a major wheat producing area. (Xinhua/Xu Yanan）

A farmer walks in a wheat field in Zhoukou, central China's Henan Province, June 5, 2021. Farmers have been busy with summer harvesting activities in Henan Province, a major wheat producing area. (Xinhua/Xu Yanan）

Farmers operate harvesters in a wheat field in Zhoukou, central China's Henan Province, June 6, 2021. Farmers have been busy with summer harvesting activities in Henan Province, a major wheat producing area. (Xinhua/Xu Yanan）

A farmer operates a harvester in a wheat field in Zhoukou, central China's Henan Province, June 5, 2021. Farmers have been busy with summer harvesting activities in Henan Province, a major wheat producing area. (Xinhua/Li An)

A farmer winnows wheat crops in Xieling Village of Sipu Township, Suixi County, Huaibei, east China's Anhui Province, June 6, 2021. (Photo by Wan Shanchao/Xinhua)

Photo shows wheat-reaping harvesters at work on Wupu farm in Suixi County, Huaibei, east China's Anhui Province, June 6, 2021. (Photo by Wan Shanchao/Xinhua）

Photo shows a wheat-reaping harvester at work in Wupu Village of Sipu Township, Suixi County, Huaibei, east China's Anhui Province, June 6, 2021. (Photo by Wan Shanchao/Xinhua）

A harvester operates in a wheat field in Xingtai, north China's Hebei Province, June 6, 2021. (Xinhua/Luo Xuefeng）