Effect of Different Times of Collection and Hormone Concentrations on Rooting of Hard and Semi-Hard Wood Cuttings in Gisela6 Cherry Rootstock

To study effects of different times of collection, IBA and NAA concentrations on rooting and related characteristics of hard wood and semi-hard wood cuttings in Gisela6 root stocks two experiments were conducted in green house-using factorial arrangements in completely randomized design with three replications. First experiment included: Two times of cutting collection (January and February), two types of cuttings (basal and terminal) and four concentrations of IBA and NAA (0, 1000 and 2000 and 3000 ppm). The second experiment included: two times of cutting collection (June and July), two types of cuttings (basal and terminal) and three concentrations of IBA and NAA (0, 1000, 1500 ppm). Results showed that times of cutting and hormones significantly (p<0.01) affected rooting (%) in hard wood and semi-hard wood cuttings in Gisela6 cherry rootstock. In semi-hard wood cuttings, the highest rooting (70%) was obtained in terminal type of cutting collected in July and treated by 1000 ppm IBA. However, in hard wood cuttings, the highest rooting (46.6%) was observed in basal type of cuttings collected in January and treated by 3000 ppm IBA. As auxin concentration increased, the number of primary and secondary roots as well as the length of rooting section increased. However, the average length of primary and secondary roots decreased.