Abstract
Two experiments was carried out in the nurseries of College of Agriculture and Forestry at University of Mosul , Mosul / Iraq, during the growth period 2007. The first was to study the effect of apricot seeds at soaking in three concentrations of GA3 (0 ,500 and 100 ) mg GA3.l-1 for 24 hors on speed and seed germination. The second experiment to study the effect of apricot seeds at soaking in three concentrations of GA3 solutions(0 ,500 and 100) mgGA3.l-1 for 24 hors and using fertilizers (NPK) as solutions for fertilizer dissolved in water and at three levels (0, 100 and 200) mg NPK.l-1 and spraying the transplants with a mix of GA3 and Kinitin1:1: at concentration levels of (0,150 and 300 ) mg .l-1 besides studying the interactions between the investigated factors. The results briefed that soaking apricot seeds with 500 mg GA3.l-1 significantly increased the germination percentage, while soaking with 1000 mg GA3.l-1 resulted in a significant increase in the speed of germination, height and diameter of transplants, root length, leaf seedlings area and dry weight of vegetative and root system. Fertilizing with NPK significantly increased the growth of the transplants especially at the concentration 200 mg NPK.l-1 which led to a significant increase in the studied characteristics. Foliar spraying with 300 mg .L-1 with the mix of GA3:Kinitin led to the increase in height and diameter of transplants, root length, leaf area of transplants and dry weight of vegetative and root system. The dual interaction between the investigated factors showed an obvious significant impact in producing apricot rootstocks that are appropriate for autumn budding especially with the treatment of 1000 mg GA3 .l-1 + 200 mg NPK .l-1 +300 mg (GA3: Kinitin .l-1) that led to an increase in height and diameter of transplants and leaf area of transplants.
