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Nitrogen content in the needles of twenty Douglas-fir provenances,  originating from different sites within the native range of the species in  the USA, was studied in a Douglas-fir provenance test established at the  montane beech site on acid brown soil. Based on the variability of nitrogen  content in the needles, the intensity and dynamics of the physiological  processes of Douglas-fir mineral nutrition were analyzed as the indicators of  Douglas-fir adaptive potential to the sites in Serbia. All the trees of the  study provenances were of the same age and grown under the same site and  population conditions. The quantities of nitrogen absorbed in Douglas-fir  needles were correlated with the geographical characteristics of the native  sites of the observed provenances. The differences in nitrogen content in  Douglas-fir needles point out the variability in the intensity of the  physiological processes in the genotypes of the different provenances. Since  the study Douglas-fir trees are cultivated on relatively small areas, in more  or less equal general conditions, it can be concluded that the parameters of  mineral nutrition depend on the genotypes constituting the gene pool of the  study Douglas-fir provenances

Variability of nitrogen content in the needles of Douglas-fir (Pseudotsuga menziesii Mir/Franco) provenances