عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Application of gibberellic acid (GA3) increases the rate of vegetative growth of plants. This research was conducted to study the effect of gibberllic acid (0, 250, 500 and 750 mg l-1) on annual seedling growth of Ber tree. The experiment was carried out in randomized complete block design (RCBD) with four replications. Measured parameters included: length of internodes, height of shoot, fresh and dry weight of leaf, shoot and root, leaf area and root area. The result showed that 750 mg l-1 GA3 was the most effective on the length of internodes and height of shoot and its difference with the other treatments were significantly at 1% probability. The other vegetative parameters included: leaf area, fresh weight, dry weight of leaf and shoot of seedling in high concentrations (500, 750 mg l-1) which were significantly different at 5% probability compared with the control ones. The result of this study showed that spray of gibberllic acid did not have significant effect on the root area, fresh and dry weight.