The aim of this study was to determine the interaction effect as well as the main effect of swallow droppings and water hyacinth compost on the growth and yield of bitter gourd plants. This research was carried out at the Experimental Garden of the Faculty of Agriculture, Islamic University of Riau, Jalan Kaharuddin Nasution, No. 113 Air Cold Village, Bukit Raya District, Pekanbaru City. The ti…