What percentage of Romans worked in agriculture?

Up until the first century A.D., fields were harvested manually by slaves or free farmers. According to Pliny, the Gaul's' invented a reaping machine which was adopted by the Romans. The vallus, a two-wheeled cart, was moved by an animal yoked to the draw bar frame. The harvester effectively beat the wheat and separated the chaff from the kernels. “On the vast estates in the provinces of Gaul, large frames fitted with teeth at the edge and carried on 2 wheels are driven through the grain by a pack animal, pushing from behind; torn heads fall into the frame." Natural History, XVIII.

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