Effect of magnesium-deficiency on antioxidative systems in needles of Norway spruce [Picea abies (L.) Karst.] grown with different ratios of nitrate and ammonium as nitrogen sources
Albert-Ludwigs Universität Freiburg, Institut für Forstbotanik and Baumphysiologie, Am Flughafen 17, Germany;Albert-Ludwigs Universität Freiburg, Institut für Forstbotanik and Baumphysiologie, Bertoldstr. 17, D-79085 Freiburg, Germany