This study aims to determine the interaction effect of bioboost biofertilizer and NPK 16:16:16 on the growth and yield of celery plants. The research was carried out at the Experimental Garden of the Faculty of Agriculture, Islamic University of Riau. for 4 months from March to June 2022. The study used a factorial Completely Randomized Design (CRD) which consisted of two factors. two is NPK 16…