Abstract

This study has been conducted in the northern region of Iraq in the Dohuk governorate, Zakho district, Batufa district, Banka village, on the irrigated Populus nigra L. trees with an area of (50) hectares. The aims of estimating the dry weight of the various elements of the tree above ground, and it was based in this study on the collection of primary data From the trees, by taking stratified random samples from the study site, and collected the basic data for the study by dropping ( 35) Populus nigra L. trees , were weighted in their different parts above ground , as well as taking secondary samples from each tree and all its elements to prepare laboratory samples, using each From field and laboratory data and various regression methods
available in the Statgraphics program came up with equations for estimating the dry biomass of different tree elements above ground, and that each of these equations were tested with accuracy measures (corrected coefficient of determination R2-adj, standard error SE, DW test, and residual analysis test), all the way to the best equation chosen to estimate the dry weight of any of the different tree elements on a surface, individually or in combination.