Abstract
This experiment was conducted on olive (Olea europaea L.) transplants, Bashika cv. in the nursery of Department of Horticulture and Landscape Design of the College of Agriculture and Forestry, during season 2012 to study the effect of four growing medias (sandy loam 100%, sandy loam 3:1 manure, sandy loam : manure: peatmoss 3: 1/2:1/2 and sandy loam: peatmoss 3:1), three levels of nitrogen fertilization (0,100 and 200 mgN.l-1) and foliar spray with GA3 (0 and 100 mg GA3 .l-1) and their interaction treatments , in order to improve vegetative growth . The experiment was factorial in randomized complete block design (RCBD), with 4 replicates and 10 transplants within each factorial units. Means were compared by Duncan multiple ranges test at 0,05% level. The most important results were as follows: Growing medium were effective in most studied parameters, The sandy loam medium 100% increased transplants height, diameter, branching ,leaves number and leaves areas, while sandy loam: manure: peat moss 3:1/2:1/2 resulted in a significant increase the height of transplants , leaves area. And fertilization with 200 mg N.l-1 resulted in an increase in transplant height, leaves number, leaves area. GA3 foliar spray at 100 mg.l-1 increased transplant stem diameter and branching. The interaction between the three factors resulted in an additional increase in transplant height, stem diameter, branching, specially the interaction between sandy loam 100% + 100 mg GA3.l-1 and 100 N.l-1 mg, while other interactions appeared a different responses.
