Adaptation of Poplar clones in Safrabasteh, Guilan province

For impelementing this research, 20 superior Poplar clones were selected from the experimental nurseries at Safrabasteh Research Station in Guilan province. From each clone, 75 seedlings were planted within a randomized complete block design in 3 replications in February of 1994. During the growing season, resistance of clones to pests and deiseases was studied. At the end of every growing season, diameter, and tree height were measured and the mean annual diameter and height growth as well as the current diameter, height and volume increment were calculated. Results showed that P. deltoides 63/51 and P. euramericana triplo had the maximum mean dbh with 20.9 cm and 19.8 cm, respectively. The maximum mean height was calculated for P. deltoides 63/51 and P.x. 63/5 (natural hybrid) with 21.9 m and 20.1 m, respectively. The maximum mean volume increment of 21.33 m3/ha/y was computed for P. deltoides 63/51. P. euramericana I-214 showed the lowest, whereas P. caspica showed the highest resistance against pests.