Harahap, D.E., Retna Astuti Kuswardani and Abdul Rauf 2025. Leaves as an Indicator of Potential Production of Palm Sap in Sugar Palm Plants (Arenga pinnata Merr) in South Tapanuli Regency. JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA). 7, 2 (May 2025), 460 -. DOI:https://doi.org/10.36378/juatika.v7i2.4295.