Sour orange (Citrus aurantium L.) seedlings were sprayed three times a season with four levels of urea (45 % N) (2.5, 5.0, 7.5 and 10.0 g/L) and two levels of ascorbic acid (150 and 300 g/L), each alone or in combinations. Meanwhile the seedlings of control treatment sprayed with distilled water during 2010 growing season, twenty days intervals between each spray and another. Results obtained at the middle of October of the same season, indicated that the foliar spray with urea at the concentrations of 5.0, 7.5 and 10.0 g/L significantly increased leaves N and chlorophyll concentrations, leaves number, seedling leaves area, seedlings height, main stem diameter and leaves fresh and dry weight, especially at the foliar spray with 10.0 g/L. The means of these parameters were 3.19%, 66.80 SPAD, 146.66 leaves/seedling, 3700.00 Cm², 83.66 Cm, 4.50 mm, 4.70 g, 1.53 g, respectively. Meanwhile ascorbic acid spray at two concentrations unsignificantly affected all parameters, except leaves chlorophyll content, leaves number and seedling leaves area. Most treatments of combinations spray with urea and ascorbic acid significantly affected all studied parameters, especially the treatment of foliar spray of urea and ascorbic acid at a concentration of 10.0 g/L and 300 mg/ L, which gave the highest means of leaves N concentration, leaves number, seedling leaves area and leaves fresh and dry weights, and it unsignificantly differs from the treatments which gave the highest means of seedlings height, main stem diameter and percentage of leaves dry matter weight .