Water relations and drought tolerance of different Zea mays cultivars as influenced by nitrogen form and application [Elektronische Ressource] / von Oscar Enrique Bustamante Morales

Institut für Nutzpflanzenwissenschaften und Ressourcenschutz - Fachbereich Pflanzenernährung - der Rheinischen Friedrich-Wilhelms-Universität Bonn _____________________________________________________________________ Water Relations and Drought Tolerance of Different Zea mays Cultivars as Influenced by Nitrogen Form and Application Inaugural – Dissertation Zur Erlangung des Grades Doktor der Agrarwissenschaften (Dr. agr.) der Hohen Landwirtschaftlichen Fakultät der Rheinischen Friedrich-Wilhelms-Universität zu Bonn vorgelegt am 29.05.2009 von Oscar Enrique Bustamante Morales aus Nicaragua Referent: PD Dr. J. Burkhardt Korreferent: Prof. Dr. H. Goldbach Korreferent: Prof. Dr. J. Léon Tag der mündlichen Prüfung: 02 November 2009 ABSTRACT “Water Relations and Drought Tolerance of Different Zea mays Cultivars as Influenced by Nitrogen Form and Application” This study was conducted to describe the physiological and morphological factors controlling the water use efficiency of maize (Zea mays L.) plants under drought conditions. The effects of localized ammonium (CULTAN) and broadcasted nitrate fertilization, two different forms of nitrogen nutrition on differently drought tolerant maize varieties were investigated.