QUALITY OF THE WATER FOR IRRIGATION IN DIFFERENT AQUIFERS IN AREA OF SEDIMENTS IN THE RIO GRANDE DO NORTE STATE, BRAZIL

rbeaa Revista Brasileira de Engenharia Agrícola e Ambiental Rev. bras. eng. agríc. ambient. 1415-4366 1807-1929 Departamento de Engenharia Agrícola - UFCG ABSTRACT More than 600 water samples from different aquifers in a semi-arid region of northeastern of Brazil were studied. The analyses were conducted using a database of the Laboratory of Analysis of Water and Soil Fertility of the Department of Soils and Geology of Escola superior de Agricultura de Mossoró. The analyses of physical and chemical properties allowed the evaluation of the quality of the water for irrigation using classic indexes in literature such as Index of Saturation of Langelier (ISL), Sodium Adsorption Ratio (SAR), SAR adjusted (SARaj) and corrected SAR (SARcor). A large number of water samples presented salinity problems and high amounts of sodium in relation to the bivalent cations Ca and Mg. The largest incidence of water with salinity and sodium problems belonged to tubular wells. 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