The present experiment was carried out at Abees area, Alexandria governorate, Egypt, during the winter growing seasons of (2021/2022 and 2022/2023) to investigate the response of garlic crop to organic fertilizer applications and slow release-N fertilizer (urea-formaldehyde ̎UF ̎) additions. The experiments were carried out in a split-plot design with three replicates.  Two kinds of organic manure fertilizers (cow and chicken manures) were arranged in main plots and five nitrogen fertilization treatments (120 kg N fed^{-1 in the form of soluble nitrogen fertilizer, 120, 100, 80, and 60 kg N fed-1 in the form of urea- formaldehyde as a slow release N fertilizer) were in sub-plots. The gained results revealed that the studied vegetative characters were significantly affected by urea- formaldehyde additions. Plant height (cm) and number of leaves/plant characters significantly affected with the interaction between the two studied independent variables (organic manure fertilizers and nitrogen fertilization rates). Cow manure fertilizer possessed a higher garlic yield (ton/fed-1}) and average bulb weight (g) compared to chicken manure fertilizer during the first season, while there were no significant differences during the second season. The results of the first season indicated that there were no significant differences between the nitrogen fertilization treatments (120 kg N fed^-1 as soluble N fertilizer, 120 and 100 kg N fed^-1 as UF fertilizer) for the garlic yield (ton/fed.), while the treatments of 100 and 120 N units as UF fertilizer outperformed the soluble N treatment (120 kg N fed^-1) during the second season. The highest mean values for garlic yield (ton fed^-1) were obtained from the combinations of cow manure + 80 kg N fed^-1 UF, cow manure + 100 kg N fed^-1 UF and chicken manure + soluble nitrogen treatment (120 kg N fed^-1) during the first study season, while the results of the second season indicated that the combinations of chicken manure + 120 kg N fed^-1 UF, cow manure + 100 kg N fed^-1 UF and cow manure + 120 kg N fed.^-1 UF gave the highest mean values for garlic yield (ton fed^-1). The combination of organic fertilizers and nitrogen fertilization treatments showed a significant effect on bulb dry matter (%) during the first study season. The findings in this study recommended that fertilization growing garlic plants during preparation soil with cow manure fertilizer (20 m³ fed^-1) + urea-formaldehyde (100 kg N fed^-1) would be advantageous to maximize garlic productivity in addition to maintaining a safe environment by using environmentally friendly fertilizers.