The Effectiveness Of Growing Media And Bio-Organic Fertiliser Application On The Growth And Yield Of Pak Choi (Brassica Rapa Var. Chinensis) For Sustainable Agriculture In Simalungun - Simanjuntak, Hiskia; Sembiring, Desi; Amrul, Hanifah (Jurnal Multidisiplin Dehasen (MUDE), 2026)