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All Journal Jurnal Biologi Tropis PERENNIAL Bioscientist : Jurnal Ilmiah Biologi Jurnal Ilmu-Ilmu Kehutanan Jurnal Pertanian Agros
Silaban, Rosalia
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Education Environmental Science Immunology & microbiology Social Sciences

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Pengaruh Hot Water Extraction terhadap Sudut Kontak Octomeles sumatrana dan Duabanga moluccana dan Kaitannya terhadap Zat Ekstraktif dan Struktur Anatomi Kayu: Effect of Hot Water Extraction on Contact Angle of Octomeles sumatrana and Duabanga moluccana Woods and Its Correlation to the Extractive Content and Anatomical Structure Marbun, Sari Delviana; Wahyudi, Imam; Suryana, Jajang; Nawawi, Deded Sarip; Ratih, Damayanti; Silaban, Rosalia
PERENNIAL Vol 21 No 2 (2025): Vol. 21 No. 2, October 2025
Publisher : Forestry Faculty of Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24259/perennial.v21i2.44044

Abstract

Binuang bini (Octomeles sumatrana) and binuang laki (Duabanga moluccana) are fast growing species that have the potential to be developed as engineered wood products. However, previous studies have shown that both wood species have high contact angle values due to the extractive content and the high acidity. Therefore, this study aimed to examine the effect of hot water extraction (HWE) pretreatment to eliminate these limiting factors. The results proved that HWE pretreatment statistically significantly decreased the contact angle of binuang bini wood but not for binuang laki wood. HWE pretreatment resulted in a decrease in the levels of hot water-soluble extractive content and degradation of other wood chemical components. The different effectiveness of HWE pretreatment on binuang bini and binuang laki wood on improving the contact angle is influenced by differences in the quantity and quality of extractive substances as well as differences in the anatomical structure characteristics of these species.
PENGARUH VARIASI KONSENTRASI LIMBAH AIR CUCIAN BERAS DAN VARIASI DOSIS PUPUK NPK TERHADAP TANAMAN CABAI MERAH (Capsicum Annum L.) Pega, Eusabius Paul; Mariana Teresa Pega; Mitha Rabiyatul Nufus; Rosalia Silaban; Rio Agung Nugroho
Jurnal Pertanian Agros Vol 27 No 3 (2025): EDISI JULI
Publisher : Fakultas Pertanian Universitas Janabadra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37159/jpa.v27i3.104

Abstract

Red chili is widely used as a key ingredient in various traditional dishes. However, its availability often fluctuates due to seasonal changes, pest and disease outbreaks, and distribution challenges, resulting in unstable market prices. This study aims to evaluate the effects of different concentrations of rice washing wastewater and varying dosages of NPK fertilizer on red chili plants (Capsicum annuum L.). It also investigates whether there is a significant interaction between these two treatments on the plant's growth and yield. The research employed a factorial Completely Randomized Design (CRD) with two treatment factors and one control. The first factor was the concentration of rice washing wastewater at three levels: 150 ml/plant, 300 ml/plant, and 450 ml/plant. The second factor was the dosage of NPK fertilizer: 10 g/plant, 15 g/plant, and 20 g/plant. The results indicated a significant interaction between the wastewater and fertilizer treatments on stem diameter at 4 weeks after transplanting and fruit diameter. The best outcome was observed with the application of 450 ml/plant of fermented rice washing water, which significantly improved plant height at 4 weeks, number of fruits, and fruit weight.
Kondisi Tempat Tumbuh dan Simpanan Karbon Diatas Permukaan Tanah pada Tegakan Jati di Taman Wisata Alam Camplong Provinsi Nusa Tenggara Timur Pathibang, Meilyn Renny; Matatula, Jeriels; Aryani, Ni Kade Ayu Dewi; Selanno, Frenly Marvi; Oktaviani, Eva; Silaban, Rosalia; Almulqu, Aah Ahmad; Kleruk, Flora Evalina; Wardhana, Laurentius D. Wisnu; Lamanda, Sukriati Andesti; Rusadi, Nusrah; Nababan, Badia Roy Ricardo
Bioscientist : Jurnal Ilmiah Biologi Vol. 13 No. 3 (2025): September
Publisher : Department of Biology Education, FSTT, Mandalika University of Education, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/bioscientist.v13i3.17235

Abstract

Forests store biomass and carbon in the form of living trees, forest floor detritus (e.g. litter falls), soil and wood products. This study describes inventory results of the above ground biomass of teak (Tectona grandis L.f.). By determining the site condition and developing allometric method, the inventory was designed to estimate the potential of above ground biomass of teak. This study aims to determine the characteristics or site qualities, carbon stock and find out whether the characteristics of the soil has a high or low correlation to the carbon stored in teak forest in Taman Wisata Alam Camplong, East Nusa Tenggara Province. Carbon stored in teak forests are 45.53 ton/ha and 104.35 ton/ha for IV and V age classes, respectively. The correlation between soil characteristics and carbon stock is obtained that the P and K soil has a positive correlation to carbon stock in the teak forest. The equation model for the relationship between growing conditions and aboveground carbon stocks is Y=25.182-4.149X1-172.231X2 + 2.046X3 + 32.711X4 + 0.297X5-28.330X6-1.746X7 +0.171X8.
Structure and Composition of the Understory Vegetation in Bunder Wonosari Grand Forest Park, Gunung Kidul Regency, Yogyakarta Province Gare, Kletus Florianus Sera; Rusadi, Nusrah; Selanno, Frenly Marvi; Syah, Firman; Silaban, Rosalia; Lamanda, Sukriati Andesti; Marpaung, Sutan Sahala Muda
Jurnal Biologi Tropis Vol. 25 No. 4 (2025): Oktober-Desember
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i4.10405

Abstract

Bunder Grand Forest Park (Tahura) is a nature conservation area that plays a crucial role in maintaining the sustainability of biological resources and ecosystems in the Yogyakarta region. The development of Bunder Grand Forest Park is not only focused on ecological preservation but also contributes to strengthening Yogyakarta's identity as a center for environmentally conscious education and tourism. This study aims to determine the types of undergrowth, INP and its species diversity. This study was conducted using a quadrat sampling technique, using a double plot method. For observations used PU with a size of 1 m x 1 m. The results of research conducted in the Bunder Forest Park area, found 21 types of undergrowth, which are divided into 2 groups, namely non-grass plants and grass-type undergrowth, with the largest INP value obtained by the type of non-grass plant, namely the Bandotan plant (Ageratum conyzoides L.), with a value of 43.22%, and the grass-type undergrowth, namely the Elephant grass plant (Pennisetum purpuroides) with a value of 84.39% while the undergrowth with the lowest INP value, obtained by the type of non-grass plant, namely Lamtoro (Leucaena leucocephala), with a value of 3.15%, and the grass-type plant, namely the Grepak Grass plant (Paspalum conjugatum Berg.) with a value of 6.57%. In terms of diversity, non-grass understory plants are known to have moderate species diversity, while grass understory plants have low species diversity.
Analisis Erosi Terhadap Pengembangan Sistem Agroforestri pada Hutan Rakyat di Desa Lupia Kecamatan Kabangka Kabupaten Muna Firman Syah; Eva Oktaviani; Hendra Kurniawan; Vellani Losenni Undra; Rosalia Silaban
Jurnal Ilmu Ilmu Kehutanan Vol. 9 No. 2 (2025)
Publisher : Jurusan Kehutanan Fakultas Pertanian Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jiik.9.2.%p

Abstract

This research aims to analyze the level of erosion in various planting patterns of agroforestry systems implemented by the community in Lupia Village, Kabangka District, Muna Regency. The background of this research is based on the issue of land degradation due to population pressure on forest areas, which prompts the need for alternative approaches such as agroforestry. The research was conducted from June to July 2012 using field study and laboratory analysis methods. The collected data includes information on rainfall, slope, soil texture and structure, as well as the types of planting patterns used. The calculation of erosion rates was done using the USLE (Universal Soil Loss Equation) method. The research results show that the agroforestry planting pattern consisting of a combination of Teak-Banana-Papaya (with an 8% slope) produced the lowest erosion rate of 17.40 tons/ha/year, while the combination of Teak-Long Beans-Cocoa (with a 12% slope) showed the highest erosion rate of 34.31 tons/ha/year. All observed planting patterns resulted in erosion levels exceeding the tolerance threshold, thus not reflecting a sustainable system. Therefore, it is necessary to apply soil conservation techniques to support the sustainability of the agroforestry system in the area.
Co-Authors Almulqu, Aah Ahmad Deded Sarip Nawawi Eva Oktaviani Firman syah Firman syah, Firman Gare, Kletus Florianus Sera Hendra Kurniawan Imam Wahyudi Indrawan, Imam Wahyudi Jajang Suryana Jeriels Matatula, Jeriels Kleruk, Flora Evalina Lamanda, Sukriati Andesti Laurentius D. Wisnu Wardhana Marbun, Sari Delviana Mariana Teresa Pega Mitha Rabiyatul Nufus Nababan, Badia Roy Ricardo Ni Kade Ayu Dewi Aryani Oktaviani, Eva Pathibang, Meilyn Renny Pega, Eusabius Paul Ratih, Damayanti Rio Agung Nugroho Rusadi, Nusrah Selanno, Frenly M. Sutan Sahala Muda Marpaung Vellani Losenni Undra