The research entitled "The Effect of Ketapang Leaf Compost and Growmore Fertilizer on the Growth and Yield of Mustard Greens (Brassica juncea L.)", was carried out at the Experimental Garden of the Faculty of Agriculture, Islamic University of Riau, Pekanbaru from March to April 2023. The aim of this study to determine the interaction effect and the main treatment of ketapang leaf compost and G…