The water footprint and virtual water exports of Spanish tomatoes

26 THE WATER FOOTPRINT OF TOMATO PRODUCTIONFIGURE 8. Yearly average green, blue and grey water footprint (WF)per production system of the main producing provinces (hm 3 )Source: Own elaboration.ance data used for the calculation of the grey water footprintdid not distinguish between the different productionsystems, being the resulting grey water footprints thereforeinversely proportional to the yield. It must be noted thatthese results are given in terms of l/kg.When analysing the water footprint in terms of total cubicmeters, the tomato water footprint is very concentrated ina few productive areas. Figure 8 represents the green, blueand grey water footprint of the eight most productive Spanishprovinces per production system and their average annualwater footprint. In accordance with Figure 6, Badajozand Almería are the two provinces with the highest totalwater footprint (hm 3 ).