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In Asian monsoon region, rice production has been a key industry for two millennia. This region is blessed of fertile paddy on vast alluvial plain, which has been formulating through erosive/transport/depositional work of rivers around upthrusted high mountains due to orogenic movements of the earth. Rice harvest was the main taxable property since the first step of the human history, and rice production process has made fundamental land use in this region. Catching up with the development of water transport and commodity economy, paddy field covered wide and flat alluvial plains expecting more and more harvest. Rice was brought away for tax or as currency.