This study aims to determine the interaction of dolomite and chicken manure to get the best dosage combination on the growth and yield of onion in peatlands. This research was conducted on peat land located in Pematang Reba, Rengat Barat, Indragiri Hulu Regency. This study used factorial randomized block design (RBD) with two factors. The first factor was doses of dolomite fertilizer (D) (2, 4 …