The effects of different nitrogen forms on growth and mineral contents of olive (Olea europaea L varManzanillo)

The experiments on Olive plants (Olea europaea L varManzanillo) were done for 4 months and the effect of different formd of Nitrogen (NO3- NH4 and urea) was carried out on factorial on the base of complete randomized blocks design with three replications in greenhouse conditions. Different nitrogen form was applied at 3 levels (4, 8 and 16 mM). Nitrogen is the mineral nutrient most commonly applied in olive.. The results indicated that the treatment of NH4 (8mM) have the greatest effect on the amount of increase weight per plant and treatment of NH4 (16 mM) have the greatest effect on the increase weight stem, leaf and root. No difference in root N concentration was observed between three N forms. there is no signification difference of weight roots the effects of N forms applied of olive plants.