An experiment was conducted at the farm of the Bangladesh Agricultural Development Corporation (BADC), Khadimpara, Sylhet 3100 during the period from August to November 2014 to see the effect of K, S and Zn application on the performance of growth, yield and yield contributing characters of BRRI dhan56 under the acidic soil in Sylhet region. The experiment consisted of eight treatments viz, Control, K80, S12, Zn1.8, K80S12, K80Zn1.8, S12Zn1.8 and K80S12Zn1.8. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Data were taken on plant height, number of tillers hill-1, panicle length, grains panicle-1, 1000-grain weight, grain and straw yields. Pre and post-harvest soil status was also analyzed to know the status due to K,S and Zn application. Result revealed that all the characters except 1000-grain weight were affected significantly due to application of K, S and Zn. The treatment K80S12Zn1.8 produced the highest plant height (100.40 cm), effective tillers hill-1 (8.13), longest panicle (27.87 cm) and grains panicle-1 (146.60). The highest grain and straw yield of 4.38 and 6.03 t ha-1, respectively was produced from the treatment K80S12Zn1.8. The lowest performance was observed in the control treatment for all parameters. The soil analyses showed that the nutrient content in post-harvest soils under fertilizer applied soils were slightly higher in comparison to initial soil.