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Fate of Urine Nitrogen in Three Soils throughout a Grazing Season

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. Cumulative urinary N uptake (g m-2) in harvested grass for (a) spring, Soil C; (b) spring, Soil B; (c) spring, Soil L; (d) fall, Soil C; (e) fall, Soil B; and (f) fall, Soil L. Symbols: •, Zone A; {blacksquare}, Zone B; {blacktriangleup}, Zone C.

 


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Fig. 2. The NO-3–N concentration of drainage water (mg L-1) during Year 1 and 2 winter periods for (a) Soil C, (b) Soil B, and (c) Soil L. Symbols: •, fall, total N; {blacksquare}, summer, total N; {blacktriangleup}, spring, total N; {circ}, fall, urinary N; {square}, summer, urinary N; {triangleup}, spring, urinary N.

 





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