الفهرس 
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Abstract
The present study was carried aut at Orman Botanic garden in Giza, horticulture research institute, Ministry of Agriculture, during 2008 – 2010.
. This experiment was carried out to study the effect of different growth regulators on the propagation of cuttings and seeds of pterygota alata and cordia macloedii trees. Treating hard wood cuttings with IBA (1000-2000 ppm) or NAA (500-750 ppm) concentrations increased rooting percentage up to 47 and 67% respectively comparing with nil in the control. There were no significant differences between the two types of hormones on the number of leaves, number of roots or root length. Also treating seeds with GA3 at (100-200 ppm) concentration increased germination percentage up to 64% comparing with nil the control. Heigh concentrations of ”GA3” increased significantly fresh weight of leaves, number of root and roots length.