Reconnesaince of chemically vulnerable areas of an aquifer under arid conditions with agricultural uses

摘要: Abstract Agriculture is one of most important economic activities that requires large amounts water, which, in addition to changes climate, presents a major impact on the water availability. Excess salt and nutrient concentrations build up damages soil such as reduced drainage increase anoxic conditions root zone, well decreasing productivity usable farm lands. The objective present study was evaluate chemical vulnerability an aquifer arid with high level extraction through detection risk zones potential subregions different risks. An evaluation quality groundwater performed, reconnaissance prior more detailed studies, which samples 30 wells were analyzed determine physical-chemical parameters (recorded situ), dissolved species (UV–vis spectrophotometry), elemental content (X-ray fluorescence spectrophotometry). Concentrations TDS, Ca, Mg, S, Cl, As determined under analysis exceeded limit established for consumption irrigation. It suggests origin composition mainly due mineral sediments. classified three groups located zones, based on: a) alkaline earth elements, b) halogens, c) ions. Water salinity composed by sulphates and, lesser extent, hydrochloric salts from leaching evaporites. Furthermore, highest are central north where soils showed crop requirement above threshold value pecan crops, agricultural products valley. In conclusion, both agriculture, combined conditions, provoking contents some crops. immediate consequences related reduction production therefore, decrease productive competitiveness.