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Pig Slurry Application and Irrigation Effects on Nitrate Leaching in Mediterranean Soil Lysimeters

A. Daudén, D. Quílez* and M. V. Vera

Unidad de Suelos y Riegos, Centro de Investigación y Tecnología Agroalimentaria de Aragón Apdo. 727, 50080-Zaragoza, Spain



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  		Fig. 1. Average NO3–N concentration (mg L–1) in drainage during the period 1 May–1 Oct. 1997 for the different treatments. Irrigation started on 12 June 1997 (first arrow) and sidedress nitrogen was applied on 20 June 1997 (second arrow). Vertical lines indicate one standard deviation. See Table 2 for treatment descriptions.

 


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  		Fig. 2. Accumulated mass of nitrate in drainage (kg NO3–N ha–1) during the period 1 May–1 Oct. 1997 in the different treatments. Irrigation started on 12 June 1997 (first arrow) and sidedress nitrogen was applied on 20 June 1997 (second arrow). See Table 2 for treatment descriptions.

 


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  		Fig. 3. Nitrate concentration and load in drainage versus amount of inorganic N applied for high leaching fraction (LF) treatments.

 


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  		Fig. 4. Nitrogen use efficiency indexes, N in aboveground biomass per unit N applied as fertilizer (RNUF), nitrate leaching per unit N applied as fertilizer (NLC), and grain yield per unit NO3–N leached (NUEL) versus the amount of available N applied for the high leaching fraction (LF) treatments. *Significant at the 0.05 probability level. **Significant at the 0.01 probability level.

 




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