Irrigated Rice Cultivation in Asia

Timeline

1. 1501–1505Suzhou Prefecture · SuzhouDuring the Zhengde era, the Jiangnan polder waterworks system matured; rice rotation and mulberry-rice intercropping supported tax grain collection. The government collected rice through the grain tribute system, while networks of irrigation waterwheels, weirs, and canals sustained high-yield paddies; rice output directly affected imperial fiscal stability.
2. 1505–1510Mekong Delta · VietnamIn the early 16th century, Japan's Kinai region and Southeast Asia's Mekong Delta expanded cultivated area through irrigated terraces. Different rice subspecies adapted to monsoon and tropical climates, and rice cultivation techniques spread across the Asian rice belt through population migration and tributary trade.