Dr. Torsten Behrens, Institute of Agronomy and CropScience,Martin-Luther-University,Halle-Wittenberg,Ludwig-Wucherer-Str. 2,D-06099 Halle (Saale),Germanyphone: + 49 346 357 3184, fax: + 49346 357 3172, e-mail:behrens@landw.uni-halle.de
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