Narrow-leaved lupine (Lupinus angustifolius L.) as nitrogen source in organic vegetable production systems [Elektronische Ressource] / Kai-Uwe Katroschan

  Narrow-leaved Lupine (Lupinus angustifolius L.) as Nitrogen Source in Organic Vegetable Production Systems Von der Naturwissenschaftlichen Fakultät der Gottfried Wilhelm Leibniz Universität Hannover zur Erlangung des Grades Doktor der Gartenbauwissenschaften - Dr. rer. hort. - genehmigte Dissertation von Dipl.-Ing. agr. Kai-Uwe Katroschan geboren am 19.11.1974 in Fulda 2011 Referent: Prof. Dr. Hartmut Stützel Korreferent: Prof. Dr. Dr. h.c. Peter von Fragstein und Niemsdorff Tag der Promotion: 10. März 2011 Abstract Green manure legumes represent an important N source in organic farming systems. However, since neither the amount of N fixed nor net N mineralization 2from soil incorporated legume biomass can be influenced satisfactorily, N availability for following crops does often not match their requirements. In pot and field experiments the potential of lupines (Lupinus angustifolius L.) to be used as flexible and well controllable N source alternative in organic vegetable production was investigated. Maximum net N mineralization (N ) from net maxcoarsely milled lupine seeds as derived from a first-order kinetics model averaged 57%.