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All Journal BIOLINK (Jurnal Biologi Lingkungan, Industri, Kesehatan) Jurnal Pertanian Agros JURNAL AGROHITA Best Journal (Biology Education, Sains and Technology) IJOEP : International Journal of Ecophysiology Jurnal Agro Estate Bioscientist : Jurnal Ilmiah Biologi Ranah Research : Journal of Multidisciplinary Research and Development Jurnal Agro Estate Jurnal Ragam Pengabdian
Aulia Juanda Djaingsastro
Institut Teknologi Sawit Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Public Health Social Sciences Transportation Other

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Assessing Environmental Drivers of the Distribution of the Rare Species Johannesteijsmannia altifrons: a literature review Siregar, Etti Sartina; Djaingsastro, Aulia Juanda
International Journal of Ecophysiology Vol. 7 No. 1 (2025): International Journal of Ecophysiology
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/ijoep.v7i1.19062

Abstract

Johannesteijsmannia altifrons, a palm species exhibits unique dispersal mechanisms and distribution patterns that are critical to understanding its ecological dynamics. Dispersal has a significant impact on this species' spatial distribution and population dynamics. The distribution is significantly influenced by altitude, which affects its growth and habitat suitability. Publications and references in this analysis came from scientific articles published in bibliographic databases such as Scopus and Google Scholar. The keyword search used was “Johannesteijsmannia altifrons”. The authors examined the literature related to the subject of the systematic review, assessed methodological rigor, analyzed the results being reported in the selected studies. Condensed and organized the data before incorporating the findings into a comprehensive systematic review in narrative form. The distribution of J. altifrons in Indonesia is mainly in the Sumatra region, especially in the Northern and Central parts of the island. Taman Nasional Gunung Leuser (TNGL), Bukit Bungkuk Nature Reserve Forest and the surrounding lowland forests are good habitats. This species has habitat suitability at range elevations 20-500 meters (asl), very steep slopes (≥ 45%). Optimal growth occurs under tree canopies, which provide the necessary shade for the plant to thrive. This suggests a specific habitat preference that influences its distribution
Kepadatan Mikroalga Mixculture Pada Media POME Skala Laboratorium Djaingsastro, Aulia Juanda; Manurung, Saroha; Maisarah; Dian, Rahmad; Machrizal, Rusdi
Bioscientist : Jurnal Ilmiah Biologi Vol. 13 No. 4 (2025): December
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.v13i4.18891

Abstract

This study aims to analyse the density of microalgae mixculture cultivated in POME media with varying concentrations and to evaluate the effect of POME concentration on microalgae growth. Microalgae mixculture was cultivated in POME media with three concentration variations, namely 10%, 20%, and 30%. Cultivation was carried out for 15 days with cell density observations every three days using a haemocytometer. The results showed that microalgae density increased over time in all treatments. A POME concentration of 30% produced the highest microalgae density at each observation time, with a maximum density of 12,564 cells/ml on the 15th day, followed by concentrations of 20% and 10% at 11,980 cells/ml and 10,080 cells/ml, respectively. These results indicate that an increase in POME concentration has a positive effect on the growth of microalgae mixculture within the concentration range used. Microalgae density increased with cultivation time in all treatments. A 30% POME concentration resulted in the highest microalgae density, indicating that the higher nutrient availability in POME supports microalgae growth. Thus, POME has the potential to be utilised as an alternative medium for microalgae cultivation as well as an effort to manage palm oil industry wastewater.
Evaluasi Resistensi Gulma Berdaun Lebar terhadap Herbisida di Perkebunan Sawit dan Pengembangan Strategi Pengendalian yang Efektif Pratama, Alfindo; Djaingsastro, Aulia Juanda
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 8 No. 3 (2026): Ranah Research : Journal Of Multidisciplinary Research and Development
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/rrj.v8i3.2102

Abstract

Weeds in oil palm plantations negatively affect the quantity and quality of fresh fruit bunches, inhibit plant growth, increase susceptibility to pests and diseases, interfere with water use, and raise production costs. This study aimed to identify dominant broadleaf weed species, evaluate herbicide resistance, determine weed regrowth time, and develop effective control strategies. A factorial randomized block design with 6 treatments and 2 controls was applied, with observations conducted every 7 days for 6 weeks. Results showed that the most dominant broadleaf weed was Synedrella nodiflora with a dominance level of 27.64%, while the lowest population was Asystasia intrusa at 12.36%. Herbicide application significantly increased weed mortality compared to the control, with paraquat treatment (P3) producing the fastest response, reaching early visible damage within hours and higher mortality rates (>50% by day 5). Resistance analysis indicated that weeds were still susceptible, with Resistance Index (RI) values of 1.53 (glyphosate) and 0.80 (paraquat). Weed regrowth began at 16 days after application (H+16), dominated by Ageratum conyzoides, Physalis minima, and Synedrella nodiflora. An effective weed control strategy involves maintaining proper application intervals and using low herbicide doses to delay resistance development.
Analisis Kandungan N, P, K, dan C-Organik pada Tanah Datar dan Tanah Miring di Kebun Silau Dunia Afdeling III PT Perkebunan Nusantara IV Regional I Simanjuntak, Riki Rikardo; Manurung, Saroha; Djaingsastro, Aulia Juanda
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 8 No. 3 (2026): Ranah Research : Journal Of Multidisciplinary Research and Development
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/rrj.v8i3.2112

Abstract

This research is motivated by the importance of soil fertility in supporting oil palm productivity through the availability of Nitrogen (N), Phosphorus (P), Potassium (K), and C-organic nutrients. The results showed that the total N content on sloping and flat land had an average of 0.13% and 0.12%, respectively, with a low category. The available P content had an average of 27.40 ppm on sloping land and 26.61 ppm on flat land with a high category. In general, the K content was classified as moderate and C-organic was classified as low in both land conditions. The t-test results showed no significant difference between flat and sloping land regarding the analyze dnutrient content. Soil functions as a medium for providing nutrients, but intensive management and continuous use of chemical fertilizers can reduce soil quality, especially organic matter. Therefore, analysis of N, P, K and C-organic is necessary to evaluate soil fertility and determine the appropriate fertilization strategy. The elements N, P, and K are essential macronutrients for plant growth, while organic C plays a role in improving the physical, chemical, and biological properties of the soil. The research was conducted at the Silau Dunia Plantation, Afdeling III, PT. Perkebunan Nusantara IV Regional I from February 2026 to May 2026, using a comparative quantitative method with laboratory analysis. Soil samples were taken purposively on flat and sloping land using the composite method (three replications). The parameters analyzed included total N, available P, K, and organic C, then tested using a t-test. The results showed that total N was low, available P was high, K was moderate, and organic C was low in both land conditions. There was no significant difference between flat and sloping land. Nutrient variations are thought to be more influenced by land management, fertilization, and environmental conditions.
Identifikasi Gulma Pada Perkebunan Kelapa Sawit (Elaeis guieensis Jacq) Di Afdeling I Kebun Pabatu PTP. Nusantara IV Djaingsastro, Aulia Juanda
BEST Journal (Biology Education, Sains and Technology) Vol 8, No 1 (2025): Juni 2025
Publisher : Program Studi Pendidikan Biologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/best.v8i1.10713

Abstract

Sifat gulma yang berbeda-beda menentukan besarnya persaingan antar gulma dan tingkat kerapatan yang tinggi melibihi ambang kerusakan tanaman, menyebabkan hasil tanaman menurun. Penelitian ini bertujuan untuk jenis-jenis gulma pada tanaman menghasilkan dan yang dominan, penelitian dilaksanakan di afdeling I Kebun Pabatu PTP Nusantara IV dari bulan April – Juni 2022. Penelitian ini menggunakan metode analisis vegetasi tumbuhan bawah menggunakan teknik purposive sampling. Parameter yang diamati yaitu pada Tahun 2013,2016,2018 dengan menggunakan plot besar 60 m dan 20 m sedangkan satu petak plot kecil berukuran 1x1 m yang terdapat 6 plot didalamnya. Data yang akan diukur untuk menduga gulma dominan yang berada pada plot adalah kerapatan, frekuensi, dan dominansi gulma. Pada ketiga tahun tanam terdapat 21 jenis gulma yang terdapat pada 36 petak (plot). Data yang di peroleh Spesies gulma yang mendominasi tumbuh pada areal tanaman kelapa sawit tahun tanam 2013 Cyperus kyllingia dengan INP 33% gulma yang tidak dominan Caladium bicolour dengan INP 2%, pada tahun tanam 2016 gulma yang tumbuh mendominasi Ageratum conyzoides dengan INP 33% gulma yang tidak dominan Phyllanthus urinaria dengan INP 2%, pada tahun 2018 gulma yang tumbuh mendominasi Asystasia intrusa dengan INP 26% gulma yang tidak dominan Brachiaria mutica dengan INP 2%
Analisa Kandungan N,P,K Dan C Organik pada Tanah Top Soil di Wilayah Dataran Tinggi Kebun Bah Birong Ulu Ptpn Iv Regional II Andreas S.M Raja Guk Guk; Saroha Manurung; Aulia Juanda Djaingsastro
Jurnal Ragam Pengabdian Vol. 3 No. 2 (2026): Mei-Agustus (Inprogress)
Publisher : Lembaga Teewan Journal Solutions

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62710/30gya883

Abstract

Soil fertility is one of the main factors affecting oil palm productivity, particularly in highland areas with varying topographic conditions. Differences in land slope are believed to influence the distribution of soil nutrients due to erosion and nutrient leaching. This study aims to analyze the content of nitrogen (N), phosphorus (P), potassium (K), organic carbon, and topsoil pH on flat and sloping land at the Bah Birong Ulu Plantation, PTPN IV Regional II. The study employs a quantitative approach using field survey methods and descriptive analysis. Soil samples were collected from flat and sloping land using a soil auger at several observation points. Laboratory analysis was conducted to determine nitrogen content using the Kjeldahl method, phosphorus using the antimony molybdate colorimetric method, potassium using flame photometry, organic carbon using the Walkley and Black method, and pH measurement using a pH meter. The research data were analyzed using a two-sample t-test under the assumption of unequal variances. The results of the study indicate that there are no statistically significant differences in the nitrogen, phosphorus, potassium, organic carbon, and soil pH levels between flat and sloped land. The average nitrogen content in sloped soil was 0.53% and in flat soil was 0.50%, organic carbon content was 1.37% and 1.17%, respectively; phosphorus content was 33.45 ppm and 37.65 ppm; potassium content was 0.637 me/100 g and 0.611 me/100 g; and soil pH was 5.34 and 5.80. These results indicate that topographic conditions have not yet had a significant effect on the distribution of soil nutrients at the study site.\n\nThis study concludes that plantation management practices such as fertilization, soil conservation, and organic matter management have a greater influence than land slope conditions in maintaining soil nutrient stability. It is hoped that these findings will serve as a basis for developing more effective soil fertility management strategies and fertilization recommendations for oil palm plantations in highland areas.
Co-Authors Andreas S.M Raja Guk Guk Angelus Nababan Arfianti, Dina Aris Sukariawan Ayanda Oloan Simbolon Binsar Mangatur Tua Sinambela Diki Sapti Purnama Eka Bobby Febrianto, Eka Bobby etti sartina siregar Fajar Nawawi Febriana Roosmawati Hardiansyah Sinaga Havier Situmorang Ingrid Ovie Yosephine Kanda Haswen Khairuna Utami Maisarah Manurung, Saroha Mardiana Wahyuni Monang Antonius Purba Muhammad Zaini Nuraida Nuraida Pratama, Alfindo Rahmad Dian Ranto Mangasi Sitorus Rudyanto Marpaung Rusdi Machrizal Siburian, Samura Natanael Simanjuntak, Riki Rikardo Suci Wandani Tarigan, Rani Yasser Subroto Ginting