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Fig. 3. (a) Daily NO₃ concentrations and flows measured in La Violada Gully D-14 monitoring station, and daily precipitation in La Violada Irrigation District (VID). The horizontal line indicates the 50 mg NO₃^– L^–1 European standard. (b) Daily N fertilizer applications in VID in 1995 and 1996, and NO₃-N exports (N_L) at D-14 during the 1995 to 1998 hydrological years.