The purpose of this study was to determine the interaction effect of Trichoderma sp and Organic NPK on caisim green mustard plants. 113, Air Cold Village, Bukit Raya District, Pekanbaru. This research was carried out for 2 (two) months, starting from March to April 2022. The design used in this study was a factorial Completely Randomized Design (CRD) consisting of two factors, the first factor …