Agriculture is a dominant land and water consumer, globally. Its effects on quantity and quality of water resources are broad and dynamic. These include, among others, impacts of: land use change to agricultural, changes in agricultural practices, irrigation, variable quality of irrigation water, excess fertilization, pesticides application, and concentrated animal feed operations; on surface and subsurface water resources. The ratio of demand/resources for both water and agricultural products is expected to increase due to population increase and rise in standard of living. Hence improving knowledge on interaction between agriculture and water resources as well as taking actions that will improve the co-sustainability of both, are required. We invite contributions assessing impacts of agricultural practices on surface and ground-water resources, as well as studies on actions taken to confront undesired impacts. We welcome investigations from field through catchment and groundwater-basin scales to national and continental assessments, as well as related laboratory works.