A field study was conducted at a farmer’s field in Ratuwamai, Morang, from February 2023 to June 2023 to assess the impact of various bio-fertilizer sources on the growth and yield characteristics of rice. The experiment followed a randomized complete block design (RCBD) with three replications and seven treatments. The treatments included: T1: Recommended NPK dose (100:30:30 kg/ha), T2: Farmyard manure (FYM) (12 t/ha), T3: Goat manure (8 t/ha), T4: Mycorrhiza (11.25 kg/ha), T5: Organic manure (11.25 kg/ha), T6: Mustard seed cake (3.75 t/ha), and T7: Control (no fertilizer). Our investigation explored the significant effects of these treatments on the growth and yield-contributing attributes of the Chaite-4 rice variety. Results indicated that T1 (7021.47 kg/ha) and T2 (6681.70 kg/ha) exhibited the highest grain yield, followed by T3 (5128.35 kg/ha), T2 (4482.78 kg/ha), T5 (4335.79 kg/...