Field experiment were carried out during the two successive seasons of 2021/2022 and 2022/2023 at the Experimental Farm, Faculty of Agriculture, Al-Azhar University, Assiut, Egypt to examine the influence of compost at 0, 5, 10, 15 tons/ ha and recommended dose of NPK fertilizers. and ascorbic acid at 50, 100 and 150 ppm, as well as, their interactions on plant growth, yield traits and volatile oil components of dill (Anethum graveolens L.) plants. The obtained results showed that the use of compost at all levels and NPK resulted a significant increase in plant height, branches number/ plants, herb fresh and dry weight g/ plant, umbels number/ plant, fruit yield g/ plant and ton/ ha., volatile oil percentage and volatile oil ml/ plant and l /ha. of dill plant. Applying the high level of compost (15 tons/ ha.)  gave the highest values of these previous traits. Obviously, foliar application with ascorbic acid led to a significant augment in above mentioned parameters. The highest values of such parameters were detected by ascorbic acid at 150 ppm during both seasons. The interaction effect on all studied parameters was statistically significant, Obviously, the use of combined treatments led to a significant augment in these tested characteristics. The chemical compounds of the oil, we noted that the compounds Carvone, Apiol, D-Limonene and α-Phellandrene have the highest percentages of this compounds compared to other compounds. Most effective treatments in increasing these traits were revealed when adding compost at 15 tons/ ha. plus, foliar application with ascorbic acid at the high concentration (150 ppm).