This experiment was conducted during season in summery 2012 growing season on two cultivars of plum transplant of cv. (SugaryShamy and Santa roza) (PrunussalicinaL.) planted in the nursery of the Nineveha research station in Mosul/Iraq to study the effect of three levels of nitrogen fertilization، foliar spray with GA3 and the variation of two cultivars SugaryShamy and Santa roza on growth. Three levels of nitrogen fertilizer were used (0،80 and 160) kgN.h-1 by using urea fertilizer (46% N) as a source of nitrogen، three levels of gibberellic acid (0،100 and 200) mg GA3.l -1 were used. Results of the study were summarized as follows: Nitrogen fertilizer significantly affected in all studied parameters، the treatment of at 160 kg N.h-1 gave the highest means of the following parameters (seedlings height، main stem diameter ،number of branches، leaves number). Spraying GA3 caused a significant increase in all studied parameters ،
( seedlings height، main stem diameter ،number of branches and leaves number ) especially at 200 mg GA3 .L-1 concentration . The study of the cultivars showed a differences an significantly between two cultivars where caused a significant increase in all studied parameters، (main stem diameter ،number of branches and leaves number) . The interaction between the three factors resulted in an significantly increase in the highest means of the following parameters، (seedlings height، main stem diameter ،number of branches and leaves number) especially the interaction between (160 kg N.h-1 + 200 mg GA3 L-1 for c.v Sugary Shamy) ،While treatment recorded (160 kg N.h-1 + 200 mg GA3 L-1 for c.v Santa roza) increase in the highest means of the above parameters.