جمع آوری و بررسی گونه ها و ارقام بومی وغیربومی صنوبر در استان مرکزی

‭The purpose of this research was to select the s.uitable poplar clones at seedling stage among 52 clones in period of four years. The clones characteristies investigated in different years for measuying and identifying height and diameter growth of seedling, survival percentage of one‬ص ‭ yearu seedlings at the end of grwthperiod , comparing of seedling growth in different experimental years,,, the effect of ..~ut:!~~_on seedling gro‬ز‭lte' measuring seedling growth at different ages (1- , 1- , : years) , idendifying 12:J uniformity of seedling growth and clones resistant to pests and diseases. The seedling were planted using cutting at 30 x 120 cm intervals. After the growth period, the seedlings harvested in 1- (one year root and one 1 1 2 year shoot) , - (two year root and one year shoot) , - (three years root and two 23years shoot) , for next investigating. The clones numbers selected from 4 species of p.nigra , p.alba, p.euramericana I and. P.deItoides, 27, 14, 7 and 4 respectively. The investigated triats will use for next study and producing of suitable seedling .‬