<![CDATA[Marlina, M., Arni, A., Anggeraini, L. A., & Alda, S. (2025). Effectiveness of liquid organic fertilizer and NPK application on rubber (Hevea brasiliensis Muell. Arg.) Yield. In: Herlinda S et al. (Eds.), Prosiding Seminar Nasional Lahan Suboptimal ke-13 Tahun 2025, Palembang 20 Oktober 2025. (pp. x–y). Palembang: Penerbit & Percetakan Universitas Sriwijaya (UNSRI).Low soil fertility due to a lack of organic matter and high acidity is a major obstacle to rubber production. The application of organic fertilizers and the addition of nutrients through inorganic fertilizers can be a solution in increase rubber production. This study aimed to evaluate the effectiveness of POC and compound NPK fertilizer on rubber production. The study was conducted from April to August 2007 at the Experimental Garden of Faculty of Agriculture, Sriwijaya University. The method used was a Factorial Randomized Block Design (FRBD) where the first factor was P0 (Control), P1 (10 ppm), P2 (20 ppm), while the second factor was T0 (Control), T1 (200 g), which was repeated 3 times. The results showed that the highest latex weight after application was obtained in treatment P2T1 (20 ppm POC + 200 g NPK fertillizer) at 71.95 g, while the lowest was obtained in treatment P0T0 (control) at 51.59 g. The highest dry rubber weight was obtained in the P2T1 treatment (20 ppm POC + 200 g NPK) at 24.89 g and the lowest in the P0T0 treatment (control) at 16.13 g. The highest stem circumference increase was obtained in the P1T1 treatment (10 ppm + 200 g NPK fertilizer) at 0.21 cm and the lowest in the P0T1 treatment (without POC + 200 g NPK fertilizer) at 0.10. The combination of treatments showed a tendency to increase yields compared to single treatments, indicating that integrated fertilization is more effective in optimizing rubber tree productivity.]]>
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