ABSTRACT This research were aims to determine the effect of rice husk ash, N, P, K fertilizer treatment and the interaction of rice husk ash with N, P, K fertilizer and to determine the best treatment on the growth and yield of upland rice (Oryza sativa L.) on peat soil medium. The research was conducted for 5 months starting from June 2022 to October 2022. The research used completely randomi…