On a late October morning, Lu Benchu, 65, stood in chest-high waders, harvesting sorghum from a field that looked more like a lake.
Beside him was his 71-year-old neighbor, Qin Baoku, slicing at the waterlogged stalks. A tracked harvester, designed for soggy ground, churned through mud in the distance, but for grain that had collapsed into the deepest water, only manual labor would do.
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