This study was conducted at a private farm, Alharsha Destrict, Zawia Region, Libya in two winter seasons of 2020/2021 & 2021/2022, to study the influence of Rhizobcterein as a biofertilizer (Azotobacter-bacteria) and N P K fertilizer rates on yield and quality of carrot cv. Chantenay. This experiment included eight   treatments as follows: Control, N P K fertilizer at 50 – 50 – 50 kg/ha, N P K fertilizer at 100 – 100 – 50 kg/ha., N P K fertilizer at 100 – 100 – 100 kg/ha., Rhizobacterein at 1.5 kg/ha, Rhizobacterein + 50 – 50 – 50, N P K (kg/ha), Rhizobacterein + 100 – 100 – 50, N P K (kg/ha) and Rhizobacterein + 100 – 100 – 100, N P K (kg/ha). The experiment was constructed with randomized complete block design with three replicates. Results confirmed that the treatment of Azotobacter inoculation with the suitable rate of N P K fertilizer (100 – 100 -50 kg/ha) enhancing vegetative growth parameters, yield and quality of carrot cv. Chantenay. Conclusively, it could be concluded that the treatment of Azotobacter inoculation with the suitable rate of N P K fertilizer, i.e.100 – 100 -50 kg/ha, being the most effective on vegetative growth parameters, root yield and quality of carrot cv. Chantenay.