Jurnal Sains Teknologi dan Lingkungan (JSTL)
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Prediksi Kehilangan Hasil Jagung (Zea mays L.) Akibat Kompetisi Gulma Poaceae di Lahan Kering
Full text linkThis research aims to determine the Poaceae weed species that have a significant effect on corn yield loss in dry land. The research method was descriptive and data collection using survey techniques in 10 sample plots measuring 1 m2 which were placed using random sampling. Observation parameters include the number of species and populations of weeds, the population of corn plants in plot-1 and the dry biomass weight of weeds and corn in plot-1. Quantitative data analysis by calculating relative density, relative frequency and relative dominance values ​​to calculate the importance value index and Summe Diminance Ratio (SDR). The results showed that the diversity, evenness, dominance and abundance of Poaceae weeds in corn plants in dry land was high. So it was found that seven species of weeds were dominant and continued to exist while the corn was growing, namely Paspalum vasginatum Sw., Leersia hexandra Sw., Digitaria longiflora (Retz.) Koel., Digitaria ciliaris (Retz.) Koel., Cynodon dactylon L., Eleusine indica Gaertn., and Panicum repens L. The competitiveness and ability to reduce corn yields of the weeds Paspalum vasginatum, Leersia hexandra and Digitaria longiflora are higher than other weeds, so that corn yield losses due to competition reach 16.45%, 7.48% and 4.40%. The weeds Brachiaria reptans, Axonopus compressus and Echinochloa colonum do not need to be controlled in corn after the plants are 45 DAT, because their competitiveness and ability to eliminate crop yields is very low
Uji Biologis Berbagai Formula Pakan Ayam Petelur Menggunakan Maggot BSF
Full text linkResearch on using maggots as a feed ingredient for laying hens is one solution to the problem of increasing feed prices and BSF maggots also have the potential to overcome environmental problems caused by the accumulation of organic waste. The research was carried out in 3 stages, namely: Stage 1. Macronutrient chemical testing of all ingredients to be used in the feed formula for laying hens. Stage 2. Preparation of 3 feed formulas using bran, corn, concentrate, and maggot according to the needs of layer phase laying hens. Stage 3. Biological testing of 3 feed formulas for 120 chickens divided into 3 treatments and 4 replications consisting of 10 chickens, according to a Completely Randomized Design. The parameters observed were feed consumption, egg weight, egg production, FCR, and egg quality both external and internal. The collected data will be tabulated and Analysis of Variance (ANOVA) and Duncan’s Multiple Range Advanced Test will be carried out. This research shows that giving up to 30% maggot was not able to produce better feed consumption, egg weight, egg production, and feed conversion compared to the control. However, based on an analysis of the internal quality of the eggs, the treatment with 30% maggot was able to produce eggs with a high yolk score (9.70±0.66) and was significant compared to the control (8.30±0.75). The conclusion from this research is that maggots have the potential to be used as feed for laying hens up to a level of 30%
Analisis Dampak Perubahan Tata Guna Lahan terhadap Debit Limpasan di Kecamatan Selaparang dan Mataram
Full text linkSelaparang and Mataram Districts are two of the six districts in the Mataram City area that experience changes in land use every year. This change can affect the absorption capacity of groundwater in the area to decrease so that if there is rain with a fairly high intensity, it can cause water to overflow to the surface and inundate the area. This study was conducted to determine the runoff discharge that occurred due to changes in land use that occurred in 2013, 2018, and 2023, and to compare the runoff discharge in 2023 with the runoff discharge based on the Regional Spatial Plan of Selaparang and Mataram Districts in 2011-2031. The initial stage in this study was to collect several secondary data such as rainfall data, land use based on the regional spatial plan, and others that can be obtained from related agencies. After that, the next stage is the delineation of the catchment area and land use analysis with the help of ArcGis and Google Earth software, as well as runoff discharge analysis. The results of the analysis show that the percentage increase in runoff discharge that occurred in Selaparang District in 2013-2018, 2018-2023, and 2013-2023 was 2.21%, 1.40%, and 3.64%, respectively. Meanwhile, the percentage increase in runoff discharge in Mataram District in 2013-2018, 2018-2023, and 2013-2023 was 2.43%, 0.73%, and 3.18%, respectively. Based on this, it can be concluded that the reduction in green land area and the increase in built-up land area each year will cause an increase in the runoff coefficient value, so that the runoff discharge that occurs in Selaparang and Mataram Districts also increases every year
Perkembangan Morfologi dan Tingkah Laku Larva Ikan Tuna Sirip Kuning Yellowfin Tuna (Thunnus albacares)
Full text linkThe yellowfin tuna (Thunnus albacares) is a pelagic fish with distinct morphological development and behavioral traits. Understanding the early stages of morphology and behavior in yellowfin tuna larvae is crucial for successful cultivation efforts, particularly during the hatchery phase. This study aimed to observe and document the developmental progression and behaviors of yellowfin tuna larvae at the Tuna Laboratory of Balai Besar Riset Budidaya Laut and Penyuluhan Perikanan Gondol, Bali. Yellowfin tuna larvae were reared in 700 L round tanks at a density of 10,000 larvae per tank. Larval rearing was monitored over a period of 13 days, specifically on days 1 (D1), 3 (D3), 5 (D5), 7 (D7), 10 (D10) and 13 (D13) post-hatching. Morphological changes in the larvae were observed over time. On day 1, the larvae were transparent and planktonic, with closed mouths and eyes and the presence of melanophore pigments in their bodies. By day 3, the larvae had opened their mouths and eyes, becoming capable of feeding. The mouth opening measured between 0.34-0.68 mm (90°) and 0.18-0.37 mm (45°) on day 5 post-hatching. As the larvae grew, improvements in swimming ability were noted, correlating with the development of the swim bladder, tail fin, and dorsal fin
Karakterisasi Produk Metalurgi Serbuk Berbahan Limbah Aluminium Paduan dan Kaca
Full text linkAluminum alloy and glass waste is often found in the business of making display racks. It is necessary to do research on the utilization of waste into useful products. This study aims to determine the hardness and compressive strength of objects made of a mixture of aluminum alloy and glass using the powder metallurgy method. The first stage was making aluminum and glass powders up to 100 mesh in size, the next stage was mixing the powders (mixing) with time variations of 70 minutes, 80 minutes and 90 minutes with a composition of 80% aluminum and 20% glass. Then manufacture of specimens with a compaction load of 8 tons. Furthermore, the sintering process at a temperature of 500 oC with time variations of 60 minutes, 90 minutes and 120 minutes, then tested hardness and compressive strength. The results obtained from the hardness test and compressive strength test showed the highest value for the test object with variations in the stirring time and sintering time of 90 minutes. Based on the two-way ANOVA analysis, the mixing time and sintering time obtained the values of Fcount>Ftable, so that the mixing time and sintering time have a significant effect on hardness and compressive strength
Brief Report on The Population Survey Long-tailed Macaque (Macaca fascicularis [Raffles,1821]) in West Nusa Tenggara, Indonesia
Full text linkSurvey on the population and distribution of long-tailed macaque (Macaca fascicularis [Raffles, 1821]) in the administrative areas of West Nusa Tenggara Province have been conducted during June-July 2024 to examine the distribution and population status on the macaque. The on-road reconnaissance survey, interview and literature studies have applied to collect data. We recorded 6146 individuals from 307 groups of long-tailed macaques in eight regencies. Of the 6146 individuals of long-tailed macaques, 1532 individuals are recorded living in conservation area, while 4614 individuals live in outside conservation area, respectively. The number of individuals and troops of the monkey showed us the minimum number that can be recorded. Further study needs to be conducted in addressed to dig more information on the existence of long-tailed macaque in West Nusa Tenggara. Furthermore, population information and distribution of long-tailed macaques could be the basic knowledge on the population management efforts in the future
Analisis Karakteristik Volumetrik Campuran Laston Berdasarkan Dust Binder Ratio dan Ketebalan Film Aspal
Full text linkfine particles and asphalt in asphalt concrete. The dust binder ratio also influences the asphalt film thickness, which plays an important role in increasing the resistance of asphalt mixture to humidity and temperature. The aim of this study was to analyze the effects of the dust binder ratio and asphalt film thickness on the volumetric properties of mixtures with various aggregate particle size distributions. Based on the analysis results, it was concluded that the dust binder ratio is inversely proportional to the thickness of the asphalt film. The dust binder ratio and asphalt film thickness had a significant effect on the volumetric properties of the mixture. The greater the value of the dust binder ratio, the more voids in the mixture, whereas the voids in the mineral aggregates and the voids filled with bitumen decreased. The thicker the asphalt film, the fewer the voids in the mix, and the voids in the mineral aggregates and those filled with bitumen increased. In this study, the volumetric properties of the mixture that met the Bina Marga specifications were obtained through the use of filler and asphalt with a dust binder ratio value between 1.2-1.32
Klasifikasi Multiclass Pada Sound Healing menggunakan Algoritma Pseudo Neareset Neighbor
Full text linkSound healing, or commonly referred to as music therapy using Acoustic Sound for Wellbeing (ASW) equipment such as drums, gongs, bells, and other types that produce specific frequency vibrations, is used in the medical field to help patients experiencing anxiety or depression. Currently, research on sound healing focuses on methods to identify appropriate frequencies that influence stress and anxiety experienced by patients. This study presents the implementation of the Pseudo-Nearest Neighbour (P-NN) algorithm for classifying multiclass ASW. In general, the P-NN algorithm performs better for multiclass scenarios, particularly in identifying outlier data in each class. Furthermore, P-NN provides better performance for all confusion matrix parameters. Using two classes (Gong and Singing Bowl), the accuracy of the P-NN algorithm exceeds 92%. This demonstrates that the P-NN algorithm can provide better performance in handling outliers within the ASW dataset
Evaluasi Penyerapan Kadar Logam Pada Daun Tanaman Wetland Pasca Pengolahan Limbah Cair Tenun
Full text linkWater pollution can be caused by an increase in the number of industries, one of which is the textile industry. One effort to reduce water pollution by heavy metals is by utilizing absorption by plants. This research aims to determine the concentration of metal pollutants Cr, Cu, Cd, and Pb accumulated by Vetiveria zizanioides plants. The test method in this research was wet digestion using a nitric acid solution (HNO3) which was then analyzed using an Atomic Absorption Spectrophotometer (AAS). Based on research results, the average metal absorption concentration of copper (Cu), chromium (Cr), Lead (Pb), and cadmium (Cd) after processing using the FTW system with the help of bacteria in processing the highest metal content is Pb 0.0007 (mg /Kg dry weight) and for Cu it is 0.0001 (mg/Kg dry weight) and Cd metal is 0.00002 (mg/Kg dry weight) and finally Cr is 0.000001 (mg/Kg dry weight). And for processing using the FTW system without the help of bacteria in processing, the average metal absorption concentration of Cu, Cr, Pb, and Cd, the highest metal content at Cu 0.0001 (mg/Kg dry weight) and Pb 0.0003 (mg/ Kg dry weight) for Cr and Cd were not detected. The absorption of Cu, Cr, Pb, and Cd metals did not affect plant growth
Pengaruh Diameter Pipa Primer Pada Irigasi Tetes Bertingkat
Full text linkMultilevel drip irrigation is an irrigation method that supports water-saving agricultural activities in limited areas by channeling water through perforated pipes from emitters. An ideal multilevel drip irrigation system can provide the same volume of droplets to plants, so that the distribution of irrigation water and the uniformity of drip irrigation are important factors that need to be considered when using drip irrigation to provide plant irrigation. This research aims to determine the effect of using variations in the diameter of PVC pipes as primary pipes on the distribution of drip irrigation and its uniformity. The primary irrigation network tested for each network to the 1st floor to the 3rd floor consists of ½", ¾" diameter and 1" pipe, while the secondary and lateral drip pipe networks use ½" PVC. The test was carried out on an area of 4 m x 1 m x 1.8 m with a distance between levels of around 0.9 m, with an irrigation water source from a 200 liter tank placed on a tower with a height of 2.5 m.The results of the research show that the discharge produced by the main pipe is different on each floor of the irrigation network, on the 1st floor the discharge is 127.13 cm3/second and on the 3rd floor the discharge is 120.91 cm3/second, while on the 2nd floor the discharge is between the values of the 1st floor discharge. and 3rd floor. Regarding the results of the distribution of drip irrigation water volume, it is known that the average does not show significant differences due to differences in network operations or due to differences in pipe diameters used, where the values for floors 1 to 3 are respectively 68.75 ml, 68 .47ml, 68.19ml. The uniformity of drip irrigation shows results above 94% on all network floors and is considered very good