o:4279 Variability of potassium content in the needles of Douglas-fir provenances of Canadian origin "VARIJABILNOST SADRŽAJA KALIJUMA U ČETINAMA KANADSKIH PROVENIJENCIJA DUGLAZIJE" en The provenance test model is based on the analysis of growth, anatomical, physiological, chemical, mechanical, and other properties of an allochthonous species to justify its transfer from the place of origin to new ecosystems. Douglas-fir is one of the most common allochthonous conifer species in the forest plantations of Europe. Given that the analysis of different physiological properties of trees is important for the introduction of specified provenances into new habitats, this paper presents the results of an investigation of the variability of potassium content in young Douglas-fir needles of 14 Canadian provenances raised on two experimental sites in Belgrade. Potassium is an essential element involved in a number of biochemical and physiological processes and plays a significant role in the adaptation of plants on biotic and abiotic stress factors. Determination of the deviation of potassium content in the needles of each Douglas-fir provenance studied was performed using the Z-test. 1552101 1821-1046 1552102 https://scindeks-clanci.ceon.rs/data/pdf/1821-1046/2020/1821-10462081029J.pdf 1552099 10.5937/SustFor2081029J 2024-04-09T11:10:41.394Z 44 yes 46 Filip Jovanović 0000-0002-4143-2497 46 Vera Lavadinović 46 Ljubinko Rakonjac 46 Snežana Stajić 0000-0001-9023-3542 46 Zoran Miletić 0000-0001-7416-4647 application/pdf 762622 https://unilib.phaidrabg.rs/o:4279 no yes 1 70 1552253 Sustainable Forestry: Collection 81-82 29 40 Институт за шумарство Београд 2020