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Fig. 3. The effect of total N supply (mineral fertilizer N + slurry N + N deposition + excreta N + residue N) on the proportion of white clover under different defoliation systems (mixed systems are one cut or two cuts in spring with subsequent grazing). Average of 1997 to 2001 at the Karkendamm experimental farm in northern Germany (Trott et al., 2004).

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