Integrated nutrient management is vital for the development and growth of rice (Oryza sativa L.), but they are rarely used nowadays due to the widespread use of inorganic fertilizers. So, the current research was executed to determine the effect of organic amendments on different growth parameters of BRRI dhan55. A field investigation was managed at the Plant Pathology field lab, Sylhet Agricultural University, from November 2018 to April 2019. Different combinations of organic amendments (T1= Recommended Fertilizer Dose, RFD which includes TSP 100g 10 m-2, MoP 100g 10 m-2, Gypsum 50g 10 m-2, Zinc 15g 10 m-2, T2= RFD with vermicompost 2kg 10 m-2, T3= RFD with vermicompost 4 kg 10 m-2, T4= RFD with cowdung 2 kg 10 m-2, T5= RFD with cowdung 4 kg 10 m-2, and T6= RFD with Biochar 4 kg 10 m-2) were used in a RCBD (Randomized Complete Block Design) with three replications. The existing results showed that RFD with biochar treatments showed better performance in terms of the initial weight of grain (50.70 g), clean grain weight (48.55 g), and number of non-effective grains per panicle (27.67) and tiller per hill (12.07). T2 (RFD with vermicompost 2 kg 10 m-2) treatments demonstrated better results in parameters such as weight of grain from a single panicle (4.04 g), single panicle grain weight (3.90 g), panicle length (24.77 cm), and grain per panicle (153.00). Biomass (34.56 g) and above-ground length parameters (90.00 cm) performed better with the T4 treatment (RFD with 2 kg 10 m-2 of cowdung). T6 treatments were showed the highest grain yield (10.71 t ha-1) followed by T3 treatments. Therefore, the present results recommended that organic amendments could be a better supplement than inorganic amendments for the growth performance of BRRI dhan55.