Non-point pollution of groundwater from agricultural activities in Mediterranean Spain: the Balearic Islands case study |
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Authors: | L Candela K J Wallis R M Mateos |
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Institution: | 1.Department of Geotechnical Engineering and Geosciences,Technical University of Catalonia (UPC),Barcelona,Spain;2.Instituto Geológico y Minero de Espa?a, IGME,Administración Periférica del Estado,Palma de Mallorca,Spain |
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Abstract: | Mediterranean Spain is a region with intensive agricultural production combined with an important seasonal water demand for
water supply. High application rates of inorganic nitrogen fertiliser, input of plant protection products and intensive irrigation,
sometimes with treated wastewater, is a common practice. As a result, most aquifers show nitrate contamination problems of
agricultural origin. Data on pesticide residues is scarce, as systematic monitoring is not currently done. In Majorca Island,
values up to 700 mg/l of nitrate in groundwater have been observed. To analyse the current situation derived from non-point
pollution, several actions have been taken at different scales: declaration of a nitrate vulnerable zone, field experiments
to evaluate nitrogen transport to the aquifer and the development of a GIS-simulation model to generate nitrate risk maps. |
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Keywords: | Groundwater Vadose zone Nitrate pollution Majorca |
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