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Abstract
The study was carried out on two growth regulators, IBA and NAA with different concentrations, aimed to evaluate effectiveness of cutting stems at the nursery; at the Center for Forestry Practice, University of Agriculture and Forestry, Hue University; from July 30, 2021 to October 30, 2021. The experiments were arranged in the randomized complete block design (RCBD). The stem cuttings were treated with the IBA or NAA at four different concentrations (250, 500, 7500 and 1000 ppm) after 0,5% Benlate solution treatment, whereas control samples were treated with 0,5% Benlate solution only, and had three replicates. The results revealed that the growth regulators affected the monitoring parameters at various concentrations were not the same, the best results belonged to 1000 ppm IBA and 750 ppm NAA for both shoots and roots of cuttings, respectively. At these concentrations, shoot part after 90 tracking days showed that survival rates were 84,44% and 82,22%, the budding rates were 94,357% and 98,57% compared to the total survival cuttings, the average number of shoots per cutting were 2,64 and 3,09, the longest shoot lengths per cutting were 9,60 and 9,62, total number of leaves per cutting were 11,78 and 12,07. For root characters after 90 tracking days included, root formation rates were equal to survival rates, average number of roots per cutting were 8,39 and 8,19, average lengths of roots per cutting were 6,32 and 6,80, rooting indexs were 53,60 and 55,61.