This study aims to determine the interaction effect and the main effect of boiler ash and grand-K fertilizer on the growth and yield of shallot. This research has been carried out at the Experimental Garden of the Faculty of Agriculture, Islamic University of Riau, Jalan Kaharuddin Nasution, KM 11 No. 113, Air Cold Village, Bukit Raya District, Pekanbaru City. The study lasted for 4 months star…