International Journal of Natural Science Studies and Development (IJOSS)
Focus The International Journal of Natural Science Studies and Development (IJOSS) is an academic journal dedicated to disseminating the latest and most innovative research in the field of natural sciences. IJOSS provides a platform for researchers, academics, and practitioners to publish high-quality research findings related to various disciplines within the natural sciences. The journal is committed to supporting scientific and technological advancement through the publication of articles that significantly contribute to the understanding and application of natural sciences. The International Journal of Natural Science Studies and Development (IJOSS) focuses on publishing high-quality research articles, literature reviews, and case studies in the field of natural sciences. Scope: Biological Sciences: Research related to living organisms, ecology, genetics, microbiology, botany, zoology, evolutionary biology, living organisms, ecosystems, genetics, biotechnology, and environmental biology. Chemistry: Research on chemical reactions, chemical substances, synthesis, materials chemistry, and environmental. Physical Sciences: Studies in physics, earth sciences, meteorology, environmental science, fundamental principles of physics, applied physics, materials physics, and nuclear physics. Interdisciplinary Natural Sciences: Integration of natural sciences with other disciplines, including biochemistry, biophysics, environmental science, and materials science. Developmental Studies: Research on the application of natural science principles in technology, environmental sustainability, and socio-economic development. Environmental Studies: Articles addressing climate change, pollution control, conservation efforts, and sustainability practices. Agricultural Sciences: Research focusing on agronomy, soil science, plant pathology, entomology, crop management, crop production, agricultural biotechnology, sustainable farming practices, and pest management. Natural Resource Management: Studies on the sustainable use and management of natural resources like water, forests, and minerals. Civil Engineering: Research that explores the intersection of natural sciences and civil engineering, including structural engineering, environmental engineering, geotechnical engineering, and sustainable infrastructure development. Scientific Methodology: Innovative methods and approaches in conducting and applying natural science research. Geosciences: Research on geological processes, geography, geophysics, and environmental changes.
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<![CDATA[Assessment of Microplastic Contamination in Coastal Waters of Southeast Asia: Implications for Marine Ecosystems and Human Health ]]>
<![CDATA[Siregar, Rahmah Juliani]]>;
<![CDATA[Mohamed , Rasidah Binti]]>;
<![CDATA[Bagaskorowati, Riana]]>
<![CDATA[ International Journal of Natural Science Studies and Development (IJOSS) Vol. 1 No. 1 (2024): IJOSS ]]>
Publisher : <![CDATA[PT Inovasi Pratama Internasional ]]>
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DOI: 10.55299/ijoss.v1i1.3
<![CDATA[This study aims to assess the level of microplastic contamination in the coastal waters of Southeast Asia and evaluate its impact on marine ecosystems and human health. Data were collected from various coastal locations in Southeast Asia, including Indonesia, Malaysia, Thailand, and the Philippines, using standard water and sediment sampling methods. Laboratory analysis was conducted to identify and measure microplastic concentrations. The results indicate that all surveyed locations were contaminated with microplastics at varying concentrations. Microplastics were found in significant amounts in surface water, sediments, and marine organisms such as fish and shellfish. The study also explores the potential impacts of microplastics on marine ecosystems, including disruptions to the food chain and the potential for bioaccumulation of harmful substances in marine organisms. Additionally, the potential health risks for humans consuming seafood contaminated with microplastics were evaluated. These findings highlight a serious threat to both marine ecosystems and human health in Southeast Asia. The study underscores the urgent need for actions to reduce the use of single-use plastics and improve plastic waste management to protect marine ecosystems and public health. Furthermore, it recommends increasing public awareness and implementing stricter policies related to plastic waste management to reduce microplastic contamination in coastal environments.]]>
<![CDATA[The Effect of Provision of Chicken Cage Fertilizer and N Fertilizer on The Growth of Pakchoy (Brassica rapa L.) Plants With Verticultural Paralon System ]]>
<![CDATA[Simbolon, Fenty Maimunah]]>;
<![CDATA[Ginting, Sulaiman]]>;
<![CDATA[Dalimunthe, Mahyuddin]]>;
<![CDATA[Gunawan, Indra]]>
<![CDATA[ International Journal of Natural Science Studies and Development (IJOSS) Vol. 1 No. 1 (2024): IJOSS ]]>
Publisher : <![CDATA[PT Inovasi Pratama Internasional ]]>
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DOI: 10.55299/ijoss.v1i1.5
<![CDATA[The research was conducted in the greenhouse of the Faculty of Agriculture, Universitas Islam Sumatera Utara. The aim of this research is to know the effect of chicken manure and N fertilizer on growth and production of mustard pakcoy plant with parallon vertikultur system. The design of this study used a Completely Randomized Design (CRD) Factorial consisting of two factors and repeated three times. The first factor is the provision of chicken coop (A) which consists of 4 levels, namely: A0 = 0 g / parallon (Control); A1 = 1000 g / parallon; A2 = 2000 g / parallon; A3 = 3000 g / parallon. The second factor is N (N) fertilizer consisting of 4 levels, namely: N0 = 0 g / parallon (Control); N1 = 1.8g / plant; N2 = 3.7g / plant; N3 = 5.6g / plant. The results showed that chicken manure gave a very significant effect on all parameters observed. The provision of chicken manure has a very significant effect on the parameters of plant height, the number of leaves, the diameter of the cob. The results showed that N fertilizer gave very significant effect on the parameters of plant height, leaf number, diameter of cob. The interaction of chicken manure and N fertilizer gave a very real effect on the diameter of the hump. However, the effect is not significant on the parameters of plant height, number of leaves.]]>
<![CDATA[Impact of CBR Value of Soil in Soaked and Unsoaked Conditions Based on 2018 Division 3 Bill Specifications ]]>
<![CDATA[Lubis, Muhammad Yusuf Parlagutan]]>
<![CDATA[ International Journal of Natural Science Studies and Development (IJOSS) Vol. 1 No. 1 (2024): IJOSS ]]>
Publisher : <![CDATA[PT Inovasi Pratama Internasional ]]>
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DOI: 10.55299/ijoss.v1i1.6
<![CDATA[Soil is a construction material that is used as embankment to provide better soil bearing capacity and resilience to the soil itself. This research aims to determine the comparison of the CBR value of soil in soaked and unsoaked conditions based on the provisions of the 2018 Directoral of Highways Specifications Division 3.2 regarding embankments. In the research, the CBR results in the soaked condition were 6.15% and the unsoaked CBR was 9.64%. The CBR value requirement based on the 2018 Specifications is a minimum of 6% of the results obtained that meet the requirements for embankment CBR value, where the CBR value in the soaked condition is greater than the unsoaked condition. Based on these results, soaked embankment soil is suitable for use if the soil is compacted under conditions of continuous work, while unsoaked embankment soil can be used after the CBR value meets after the soaking process or a drying period of 4 days (96 hours).]]>
<![CDATA[Utilization of Casgot and Eco Enzyme Fertilizer as Nutrient Support to Increase the Growth of White Cooperate (Brassica Pekinensis L) of the Tahono Variety in Karo District ]]>
<![CDATA[Zulfansyah, Ichpan]]>;
<![CDATA[Yulianita, Siska]]>;
<![CDATA[Balatif, Fuad]]>;
<![CDATA[Panjaitan, Faisal Azhari Baldan]]>
<![CDATA[ International Journal of Natural Science Studies and Development (IJOSS) Vol. 1 No. 1 (2024): IJOSS ]]>
Publisher : <![CDATA[PT Inovasi Pratama Internasional ]]>
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DOI: 10.55299/ijoss.v1i1.7
<![CDATA[Efforts to increase the growth of white mustard plants can be done by providing Kasgot Fertilizer and POC Eco enzyme treatment. If you look at the correct dose, type, time and method of fertilization, the plant's response to fertilization will increase growth and yield. This research was carried out with the aim of determining the effect of plants on the concentration of Kasgot and POC Eco enzyme in white mustard plants. This research was repeated three times using a two-way randomized block design (RAK). The cassava concentration factor (K) has 4 levels, K0 (control), K1 (2 kg/plot), K2 (3 kg/plot), K3 (4 kg/plot). POC Eco enzyme factor (C) consists of 3 levels, namely E0 (control), E1 (20 ml/L), E2 (35 ml/L). Observation parameters include plant height, stem diameter, leaf width for each sample plant. Application of Kasgot Fertilizer had a significant effect on plant height and stem diameter of white mustard plants (3 kg/plot). The administration of POC Eco enzyme had no significant effect on all parameters observed. The interaction of providing Kasgot Fertilizer and POC Eco enzyme had no significant effect on all the treatments observed.]]>
<![CDATA[Potential use of Several Fungalendofit Fungus in Rubber Crops (Hevea Brasiliensis) Plant for Healrth Invesment (Colletotrichum gloeosporiodes) in Rubber Plant ]]>
<![CDATA[Ginting, Sulaiman]]>
<![CDATA[ International Journal of Natural Science Studies and Development (IJOSS) Vol. 1 No. 1 (2024): IJOSS ]]>
Publisher : <![CDATA[PT Inovasi Pratama Internasional ]]>
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DOI: 10.55299/ijoss.v1i1.8
<![CDATA[Rubber is a key plantation commodity in Indonesia, serving as a significant source of non-oil and gas foreign exchange. However, rubber productivity remains low, largely due to inadequate cultivation technology and the impact of pests and diseases. One of the most economically significant diseases affecting rubber plants is deciduous disease caused by Colletotrichum gloeosporioides, which spreads through spores carried by wind and rain. This study was conducted at the Sungei Putih Rubber Research Institute, North Sumatra, from February to June 2019, at an elevation of ± 25 meters above sea level. A factorial randomized block design (RBD) with three replications was employed. The treatments included three types of endophytic fungi (E1, E2, E3) derived from different isolates of PB 260 rubber clones, and four application methods (M0, M1, M2, M3). The observed parameters included latent period, disease occurrence, and disease intensity. The results indicated that the E2M2 treatment, which combined the second endophytic fungus with metabolite application, was the most effective in controlling C. gloeosporioides deciduous disease. This combination resulted in the highest average latent period (3.67%), the lowest disease occurrence (0.03%), and the most effective reduction in disease intensity (17.67% after 12 days). The study demonstrates the potential of specific endophytic fungi and application methods in managing rubber plant diseases, offering insights for improving rubber productivity in Indonesia.]]>
<![CDATA[Analysis of the Effect of Road Damage Conditions on Vehicle Speed (Case Study of Road Sections in Tanjungbalai City) ]]>
<![CDATA[Sihombing, Alexander Tuahta]]>
<![CDATA[ International Journal of Natural Science Studies and Development (IJOSS) Vol. 1 No. 1 (2024): IJOSS ]]>
Publisher : <![CDATA[PT Inovasi Pratama Internasional ]]>
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DOI: 10.55299/ijoss.v1i1.9
<![CDATA[Economic growth and technological advancements have increased mobility in various aspects of life, with land transportation being the primary choice for daily activities. In this context, the availability of good road infrastructure is crucial for ensuring the smooth operation of transportation systems. The condition of road pavement is a key factor that influences how efficiently the system operates, as poor pavement conditions can lead to longer vehicle travel times. A comprehensive analysis can help identify specific components that contribute to changes in road conditions over time. According to the Road Law (2004), public roads are classified based on their function into arterial roads, collector roads, local roads, and environmental roads, each with different characteristics in terms of travel distance and average speed. Road damage is generally divided into structural damage, which occurs when the pavement can no longer support traffic loads, and functional damage, which compromises the safety and comfort of road users, thereby increasing operational costs. Several factors contributing to road pavement damage include increased traffic loads, poor drainage systems, construction materials, unstable subgrade conditions, and Indonesia's tropical climate, characterized by high air temperatures and rainfall. Research conducted in Tanjung Balai City shows a correlation between road pavement conditions and vehicle speed; as pavement conditions deteriorate, vehicle speeds decrease. The results indicate a significant relationship, with an R2 value of 0.92, meaning a 92 percent correlation.]]>
