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Literatur Paulsen HM, Haneklaus S, Rahmann G, Schnug E (2009) Organic plant production - limited by nutrient supply? : an overview. In: Proceedings CIEC 2009 : 18th Symposium of the International Scientific Centre of Fertilizers ; more sustainability in agriculture: new fertilizers and fertilization management ; 8-12 November 2009 Rome, Italy . Rome: CIEC, pp 373-380