Purwanto, Iir, Zulfa Zakiah, and Riza Linda. 2021. “Growth of Pepper Plant (Piper Nigrum Linn.) After Application of Organic Fertilizer Leaves of Gamal (Gliricidia Sepium (Jacq) Kunth.)”. Jurnal Biologi Tropis 21 (3):854-62. https://doi.org/10.29303/jbt.v21i3.2838.