Document Type : Articles
Authors
Dept. Forestry Science, College of Agriculture and Forestry, University of Mosul
Abstract
A comparative anatomical taxonomic study was conducted for (4) species and (8) cultivars belonging to the genus Juglans belonging to the family Juglandaceae, naturally grown and cultivated in northern Iraq, in (16) sites distributed over (5) governorates (Nineveh, Dohuk, Erbil, Halabja and Sulaymaniyah), These four species are (Juglans regia L., J. microcarpa Berl J. australis Gris.and J. nigra L) and the eight cultivars of the common walnut species Juglans regia L are(Denmarki, Afghani, clustered, lobed-3, Kirmashan1, Yahoodi Horaman1,and Horaman2) The study included two main aspects, namely the chemical separation of wood cells(Maceration), and the mechanical separation of wood cells using the Macrotom device. We found that the naturally grown species in northern Iraq, which is J. regia L., has long fibers compared to the other studied species, which gives it preference in wood industries, and due to the possession of trees of various species and cultivars of walnuts. Because the trees of species and cultivars of walnuts possess rather long container elements, they are suitable in various wood industries, and the results showed the variation of species and cultivars in the characteristic of the pitting type. Hence, it was found that this characteristic is of great importance in Identification the wood of the studied walnut species. With regard to the anatomical study of the mechanically separated wood cells, and after reviewing the research and sources, it was found that there is no anatomical and diagnostic study of the three aspects of wood (cross-section, tangential and radial) for species and cultivars of walnut at the level of the Iraqi country, as it is being conducted for the first time in it. The results also showed that the quantitative and qualitative characteristics of walnut trees growing in northern Iraq are of great diagnostic importance. Northern Iraq based on the evidence of Panshin and DeZeeuw (1980) to diagnose the wood of this studied species. © 2024, Tikrit. J. Agric. Sci. All rights reserved
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