Optimisation of nitrogen management after harvest of the main crop by growing turnips [Brassica rapa L. ssp. rapifera (Metzg.) Sinsk.] as a catch crop and field vegetable [Elektronische Ressource] / von Tomaž Kotnik

Rheinische Friedrich-Wilhelms-Universität Bonn Institut für Organischen Landbau Prof. Dr. U. Köpke Optimisation of nitrogen management after harvest of the main crop by growing turnips [Brassica rapa L. ssp. rapifera (Metzg.) Sinsk.] as a catch crop and field vegetable Inaugural-Dissertation zur Erlangung des Grades Doktor der Agrarwissenschaften (Dr. agr.) der Hohen Landwirtschaftlichen Fakultät der Rheinische Friedrich-Wilhelms-Universität Bonn zu Bonn vorgelegt im Februar 2006 von Dipl. Ing. Agr. Tomaž Kotnik aus Ratingen Vorsitzender: Prof. Dr. M. B. Piorkowsky Berichterstatter: Prof. Dr. U. Köpke Berichterstatter: Prof. Dr. A. Skowronek Tag der mündlichen Prüfung: 28. Juni 2006 Gedruckt bei: Verlag Dr. H. J. Köster, Berlin ABSTRACT The objective of the present study was to investigate whether the short growing season after the harvest of potatoes (PO) and faba beans (FB) enables to grow a marketable crop that can at the same time reduce soil nitrate concentration. For that reason turnips (Brassica rapa L. ssp. rapifera (Metzg.) Sinsk.) grown as field vegetables were investigated in order to determine their nitrogen sink capacity, nitrogen export with marketable roots and precrop effect on following wheat crop.