Adaptability experiment of 21 poplar clones for introducing the most suitable clones in Markazi province

World increasing demand for wood production, caused the increasing impact to natural forest. Short term exploitation and improvement of wood production have been reduced these impacts. Considering the special characteristics of poplars, plantation of these fast growing species could be a proper solution to solve the problems. This research was carried out with the aims of increasing wood production by collection of better and more adaptable poplar clones to climatic and edaphic condition in Markazi province. In this research, 21 poplar clones were compared using the complete experimental block design in 3 replications. ِDiameter at breast height and height of trees were recorded and total volume and volume increment were calculated. Based on results, we concluded the following higher diameter, height and volume increment were found in Populus nigra 56. 72 with 20. 7 cm, 17. 57m and 36. 55 m3/ha/years, respectively. Other promising clones are P. nigra 72. 19, P. nigra 72. 5 and P. nigra betulifolia. The poorest results were observed on different clones of populus alba.