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Published online 3 April 2006
Published in J Environ Qual 35:776-785 (2006)
DOI: 10.2134/jeq2005.0065
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Environmental Impact of Irrigation in La Violada District (Spain)

II. Nitrogen Fertilization and Nitrate Export Patterns in Drainage Water

D. Isidoro*, D. Quílez and R. Aragüés

Unidad de Suelos y Riegos, Centro de Investigación y Tecnología Agroalimentaria (CITA-DGA) and Laboratorio de Agronomía y Medio Ambiente (DGA-CSIC), Apdo. 727, 50080-Zaragoza, Spain


Figure 1
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  		Fig. 1. Stacked area chart of daily N fertilizer inputs applied to the main crops grown in La Violada Irrigation District (VID) during the 1995 and 1996 hydrological years.

 

Figure 2
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  		Fig. 2. Daily nitrogen fertilization (NF) in La Violada Irrigation District (VID) and in La Violada Gully watershed (VGW) during the 1995 and 1996 hydrological years.

 

Figure 3
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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 (NL) at D-14 during the 1995 to 1998 hydrological years.

 

Figure 4
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  		Fig. 4. Monthly average N loads, flows, and NO3 concentrations measured in La Violada Gully D-14 monitoring station for the 1995 to 1998 hydrological years. The vertical bars represent one standard error of the mean.

 




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