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Fig. 4. (a) The effect of total N supply (mineral fertilizer N + slurry N + N deposition + excreta N + residue N) on annual N surplus under different defoliation systems (mixed systems are one cut or two cuts in spring with subsequent grazing) at the Karkendamm experimental farm in northern Germany (Trott et al., 2004). (b) The relationship between annual N leaching losses and annual N surplus on grassland at the Karkendamm experimental farm in northern Germany (Wachendorf et al. (2004a).)
