Thesis (M.Sc.) - Cairo University - Faculty of African Postgraduate Studies - Department of Natural Resources

The present study was carried out under plastic house conditions at the nursery of Zohria garden, Hort. Res. Inst., ARC, Cairo, Egypt throughout the two successive seasons of 2015 and 2016 to reveal the effect of planting date (winter, spring, summer and autumn), some rooting promoters at different concentrations i.e. IBA, NAA, 2,4-D, catechol, cinnamic acid and tryptophan (alone or in combination) and their interactions on rooting and the following growth on cuttings of some hard-to-root ornamental trees. For Magnolia grandiflora planting in winter in addition to treating with IBA at 4000 ppm + NAA at 4000 ppm formulation resulted in the highest values in terms of number of leaves/cutting, shoot fresh weight (g), rooting percentage (%) and total chlorophylls (mg/100 g f.w.). Although there was no clear trend could be observed from the obtained results, planting Phytolacca dioica cuttings in either spring or autumn in addition to treating with IBA at 4000 ppm + NAA at 4000 ppm formulation increased rooting percentage (%) to the highest values. While, for tectona grandis planting in spring in addition to treating with one of these four combined treatments; IBA at 4000 ppm + NAA at 4000 ppm, cinnamic acid at 2000 ppm + IBA at 2000 ppm, IBA at 2000 ppm+ catechol at 2000 ppm or NAA at 2000 ppm+ catechol at 2000 ppm formulations recorded the highest values regarding rooting percentage (%) and other studied traits. Concerning Vangueria edulis the highest rooting percentage (%) was recorded by planting in autumn in addition to treating with either catechol at 2000 ppm or NAA at 4000 ppm + IBA at 2000 ppm + cinnamic acid at 1000 ppm formulations

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