The project bases on the concepts of virtual water and water footprint. Every country that imports or exports agricultural goods virtually imports or exports the water that is necessary to produce such goods. The trade of goods among countries is thus associated to flows of virtual water which are assotiated to trade. Each country involved in the global trade is a node of a complex network where the links (and their weigths) are the virtual water flows. Thanks to the virtual water trade network, countries with scarce water availability can meet the local demand and ensure their water and food security. In order to correctly define the virtual water flows, it is important to evaluate the water footprint of agricultural products, as grown in a certain place and in a specific period. The project also involved an experimental study on the soiless cultivation aiming at optimizing the crop water footprint.