A contribution on the bio-actions of rare earth elements in the soil-plant environment [Elektronische Ressource] / von Hassan Ragab Hassan El-Ramady

A contribution on the bio-actions of rare earth elements in the soil/plant environment Von der Fakultät für Lebenswissenschaften der Technischen Universität Carolo-Wilhelmina zu Braunschweig zur Erlangung des Grades eines Doktors der Naturwissenschaften (Dr. rer. nat.) genehmigte D i s s e r t a t i o n von Hassan Ragab Hassan El-Ramady aus Kafr El-Sheikh, Ägypten 1. Referent: apl. Professor Dr. Dr. Dr. Ewald Schnug 2. Referent: apl. Professor Dr. Dirk Selmar eingereicht am: 11.06.2008 mündliche Prüfung (Disputation) am: 14.08.2008 Druckjahr 2008 Dedication I didicate this work to my great mother Nozha, my great father Ragab, my lovely wife Neama, my handsome sons Mahmoud and Abd El-Rahman. Acknowledgments I would like to express my deepest appreciation and sincere gratitude to my supervisor, Prof. Dr. Dr. Dr. Ewald Schnug, head of the Institute for Crop and Soil Science (PB), Federal Research Centre for Cultivated Plants (Julius Kuehn-Institut, JKI), Braunschweig for initially accepting me as a Ph. D. Candiddate and later on for his encouragement, and for helpful and enlightening discussions. Similarly, I am thankful to Prof. Dr.