File:Nährstoffversorgung der Ackerflächen in Deutschland.jpg

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Deutsch: Entwicklungstendenz für die Nährstoffversorgung der Ackerflächen in Deutschland aus organischen und mineralischen Düngemitteln
Date
Source Krombholz, K., Bertram, H., Wandel, H.: 100 Jahre Landtechnik – Von Handarbeit zu Hightech in Deutschland, DLG-Verlag, Frankfurt/Main, 2009, ISBN 978-3-7690-0737-4
Author Klaus Krombholz

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current18:15, 7 February 2011Thumbnail for version as of 18:15, 7 February 20111,105 × 694 (125 KB)Nikrohist (talk | contribs){{Information |Description ={{de|1=Entwicklungstendenz für die Nährstoffversorgung der Ackerflächen in Deutschland aus organischen und mineralischen Düngemitteln }} |Source =Krombholz, K., Bertram, H., Wandel, H.: 100 Jahre Landtechnik –

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