“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)”. 2025. Journal Tropical Agricultural Inovation 1 (1): 7-13. https://jurnal-alfatah.id/teknofarm/article/view/3.