By Himken M.   Lammel J.   Neukirchen D.   Czypionka-Krause U.     in Plant and Soil

ISSN:0032-079X|189|1|117-126

Springer Publishing Company ‎(1997)‎

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By Neukirchen D.   Himken M.   Lammel J.   Czypionka-Krause U.   Olfs H.-W.   in European Journal of Agronomy

ISSN:1161-0301|11|3|301-309

Elsevier‎(1999)‎

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