Even agriculture has played a very important role in the economic history of the island, especially in the great plain of Campidano, particularly suitable for wheat farming. The Sardinian soils, even those plains are slightly permeable, with aquifers of lacking and sometimes brackish water and very small natural reserves. Water scarcity was the first problem that was faced for the modernization of the sector, with the construction of a great barrier system of dams, which today contains nearly 2 billion cubic meters of water. The Sardinian agriculture is now linked to specific products such as cheese, wine, olive oil, artichoke, tomato for a growing product export. The reclamations have helped to extend the crops and to introduce other ones such as vegetables and fruit, next to the historical ones, olive and grapes that are present in the hilly areas. The Campidano plain, the largest lowland Sardinian produces oats, barley and durum, of which is one of the most important Italian producers. Among the vegetables, as well as artichokes, has a certain weight the production of oranges, and, before the reform of the sugar sector from the European Union, the cultivation of sugar beet.