References

1. PD Dr. Joachim Schulze

Department of Crop Sciences – Section of Plant Nutrition

Georg-August-University

Carl-Sprengel-Weg 1, 37075, Göttingen

GERMANY

Tel: +49-551-395575

Fax: +49-551-39-5570

E-mail: < jschulz2@gwdg.de>

2. Prof.  Dr. Norbert Claassen

Department of Crop Sciences – Section of Plant Nutrition

Georg-August-University

Carl-Sprengel-Weg 1, 37075, Göttingen

GERMANY

Tel: +49 551-39-5569

Fax: +49-551-39-5570

E-mail: <nclaass@gwdg.de>