Deterioration of the quality of ground water in agricultural region. Case Mitidja (Algeria)

In Algeria the plain of Mitidja, famous for fertilization its soil, on overuse, is exposed to pollution due particularly fertilizers and other phytosanitary. The spatio-temporal distribution concentrations major ions, namely nitrates, would explain transfer circulation mechanisms these elements within groundwater .The disparity in nitrate levels shows exposure Mitidja aquifer over entire extent. geological origin high nitrates places cannot alone this distribution. are higher during recharge irrigation leaching effect agricultural soils. use highly nitrogenous chemical agriculture, compared evolution piezometric levels, causes a significant increase their transport from surface aquifer. subterranean waters Quaternary show certain areas greater than 250 mg / l (Hamiz region eastern part Mitidja). This concentration results mainly (market gardening).