When did the terrace fill start to be built, and in what development process did you do your best?

Terraces began to exist in China as early as the Qin and Han Dynasties. Planting rice requires a large area of ponds, but the southeastern provinces of China are hilly and lack plain terrain suitable for planting rice. In order to solve the food problem, farmers who immigrated here built terraces and used dams to store water, which made it possible to grow rice in a large area in hilly areas and solved the local food problem. However, planting terraced fields consumes much more manpower than plain, and the yield is not superior, and the vegetation in hilly areas is seriously damaged, so this farming method is gradually eliminated, and now it is only a tourist attraction.

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