TEST THE POTENTIAL GROWTH AND YIELD OF PLANTS PAK CHOI (Brassica rapa Subsp. chinensis (L.) Hanelt Var. Green) THROUGH HYDROPONICS SYSTEM-NUTRIENT FILM TECHNIQUE AT THE LEVEL OF THE CONCENTRATION OF NUTRIENTS ®AB MIX. JAT. 2021;2(2):62-69. doi:10.35791/jat.v2i2.35335