Influence of Cytokinin and Ammonium Nitrate on Elongation of Adventitious Buds in Norway Spruce(Picea abies) Influence of Water Content and Temperature on the pH values of Solution Extracted from Acidified Forest Floor Materials of Norway Spruce Qualitative Analysis of Endogenesis Hormone and Polyphenol During Rooting of Cuttings in Norway Spruce (Picea abies) Norway spruce (Picea abies) laccases: Characterization of a laccase in a lignin-forming tissue culture A Study on the Element Extraction from OrganicMatter of Forest Floor of Norway Spruce FLOWER-INDUCTIVE TREATMENT AND QUANTITATIVE ANALYSIS OF GIBBERELLINS IN GRAFTING PLANTS OF NORWAY SPRUCE (PICEA ABIES)