Irrigation Agrosystems in Eastern Spain: Roman or Islamic Origins?

Abstract The long-standing controversy concerning Islamic diffusion of cultivars and irrigation technology to Spain is approached by comparing Roman and Islamic agrosystems at the general, regional, and local levels. We describe the Roman intensification of the older Mediterranean agrosystem and then examine the subsequent agricultural and demographic decline between A.D. 250 and 800. The operation, organization, and evolution of large, intermediate, and small-scale irrigation are analyzed in seven case studies from the Valencia region of eastern Spain. The largest systems were refurbished in Islamic times, but during a period when Berber and Arab settlement was thin and acculturation of th…