THE EFFECT OF CONCENTRATION AND FREQUENCY OF APPLICATION OF SHALLOT EXTRACT AS A NATURAL GROWTH REGULATOR (PGR) ON THE GROWTH OF ROBUSTA COFFEE SEEDLINGS (COFFEA CANEPHORA). Teknofarm. 2025;1(1):7-13. Accessed February 4, 2026. https://jurnal-alfatah.id/teknofarm/article/view/3