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Abstract

Pine resin (Pinus merkusii Jungh. et de Vriese) is a non-timber forest product with high economic value; however, in Parsingguran 1 Village, Pollung District, Humbang Hasundutan Regency, its potential has not been optimally utilized due to the improper and unmeasured application of chemical stimulants. This study aimed to evaluate the effects of stem diameter and the composition of sulfuric acid (H₂SO₄) and nitric acid (HNO₃) stimulants on the productivity and quality of pine resin, as well as to analyze the interaction between these factors. The research was conducted in June 2025 using an experimental method arranged in a factorial Randomized Complete Block Design. The treatments consisted of four stem diameter classes (25–30 cm, 31–35 cm, 36–40 cm, and 41–45 cm) and four stimulant combinations (control, H₂SO₄ 10% + HNO₃ 10%, H₂SO₄ 20% + HNO₃ 10%, and H₂SO₄ 30% + HNO₃ 10%), with three replications. Data were analyzed using two-way ANOVA followed by Tukey’s test when significant differences were detected. The results indicated that both factors had a significant effect on resin yield, with the highest production obtained from the combination of H₂SO₄ 30% + HNO₃ 10% applied to trees with a stem diameter of 41–45 cm. The use of stimulants also reduced the moisture and impurity content of the resin without affecting its color. Overall, this treatment was considered the most effective for enhancing pine resin productivity in large-diameter trees and can be applied to achieve efficient and sustainable tapping practices.


 


Keywords: Pinus merkusii; pine resin; stem diameter; sulfuric acid; nitric acid; productivity

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Copyright (c) 2026 Kristina Helen Banjarnahor Helen Banjarnahor, Putranto Budiono Agung Nugroho, Mela Faradika

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