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Nitrate Leaching under Grassland as Affected by Mineral Nitrogen Fertilization and Cattle Urine

M. L. Decau*, J. C. Simon and A. Jacquet

UMR-INRA950, Université de Caen, Esplanade de la paix, 14032 Caen, France



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  		Fig. 1. Nitrate concentration in drainage water in winter and spring 1996–1997 according to fertilizer level and urine application date. Filled diamonds, no urine; filled squares, total N A2; open squares, urine N A2; filled circles, total N A3; open circles, urine N A3. 0N, nitrogen fertilization of 0 kg ha–1 yr–1; 150N, nitrogen fertilization of 150 kg ha–1 yr–1; 300N, nitrogen fertilization of 300 kg ha–1 yr–1; A2, treatment providing 10.5 g N m–2 as urine; A3, treatment providing 16.5 g N m–2 as urine.

 


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  		Fig. 2. Cumulative N leaching losses. (a) Mean according to fertilizer application: filled triangles, 0N; filled squares, 150N; filled circles, 300N. (b) Mean according to urine N content: filled triangles, no urine; filled squares, urine A2; filled circles, urine A3. 0N, nitrogen fertilization of 0 kg ha–1 yr–1; 150N, nitrogen fertilization of 150 kg ha–1 yr–1; 300N, nitrogen fertilization of 300 kg ha–1 yr–1; A2, treatment providing 10.5 g N m–2 as urine; A3, treatment providing 16.5 g N m–2 as urine. Each point is the mean of three to nine data ± SE.

 




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