Phenological study of different Poplar clones Populus euramericana and Populus deltoides in Karaj collection during 1986-2004
Ghasemi,R.; Rahmati,A.R.M.; Hemmati,A.; Asadi,F.; Kalagari,M.
Iranian Journal Of Forest And Poplar Research: 3, 390-407
Poplar collection project was carried out in frame of the national project for gathering native and exotic poplar clones and establishing of selection nursery, using 57 different species and clones in year 1984 in the Alborz research center, Karaj. Five seedlings from each clone (two years old) were planted in lines with 5 m x 8 m spacing. During the study years, more new clones from five poplar sections were gradually added to the pervious ones.