This work was carried out to study the effect of Diammonium Phosphate (DAP) fertilizer during spring 2014 to produce the volatile oil from sage plant. Four levels of DAP (21%P, 18%N) (0, 100, 200 and 300 Kg/ha) were used on sage plants. The experiment was designed according to complete randomized design (CRD). The measurements of plant heights, Fresh and dry weights, surface area of the aerial leaves and active compound concentration were recorded as control before flowering. Results revealed significant differences (p ≤0.05) in Plants height, fresh and dry weights and surface area between treatments. In the control group measures were (18.00cm, 100.22 g/pot, 18.55 g/pot and 5.22 cm2) respectively. The highest values were reported with 300 kg/ha treatment (26.50 cm, 118.25, 21.86 g/pot and 7.21 cm2) respectively. Volatile concentration was measured using Clevenger with steam distillation apparatus.  Diammonium Phosphate addition levels showed different effect on Volatile oil content in aerial part (Shoots). The lowest was (1.68%) for 300 kg/ha, and the highest was (3.07%) in 100 Kg/ha

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