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ABSTRACT

This study was carried out in the wooden canopy belonging to the Department of Horticulture

and Garden Engineering Faculty of Agriculture "Mosal Univ" during the growing season 2018 in

order to demonstrate the importance of the effect of two dates for spring grafting (2nd and 17th April)

and fertilization of local oranges seedlings grafted on bitter orange rootstock to compound fertilizer

(NPK) at 30 g/seedling, organic liquid fertilizer "Nutrigreen" at 6 ml/L and using three types of biofertilizers

such as Biogen at 3 and 6 g/ seedling, Potasiomag at 5 and 10 g/ seedling and Fulzyme at 1

g/ seedling as a nutrient elements. The experiment was designed using of the complete randomized

block design (RCBD) with three replicates and five seedlings per experimental unit. Averages were

compared using Dunkin test at 5% level.The results showed that the first date of grafting (2nd April)

affected significantly the characteristics studied, especially the percentage of successful grafts, the

number of leaves and the leaf content of nitrogen. The bio-fertilization treatments with Biogen and

Potasiomag were significantly superior to other fertilizer treatments, especially the control treatment

by the percentage of successful grafts, the number of leaves and the leaf content of nitrogen

phosphorous and potassium.