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Scientific Timeline
Published by Universitas Nahdlatul Ulama Purwokerto
ISSN : -     EISSN : 27763935     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Scientific Timeline is focusing on the field of science and technologies that are studied in Universitas Nahdlatul Ulama Purwokerto. Agriculture, Farm, Fisheries and basic sciences of Maths and Biology are some of them with addition of Food Technology and Agricultural Biosystem Engineering. This journal is scoping articles from reports of analysis, studies, research, to application of theories, material development, and also some reviews.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Perairan
Articles 31 Documents
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Perencanaan dan Pengendalian Proyek dengan Metode CPM (Critical Path Method) di PT Ghani Sejahtera Abadi Nur'aini Muhassanah; Ikhsani Annisa Khozinati
Scientific Timeline Vol. 1 No. 2 (2021)
Publisher : UNU Purwokerto

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Abstract

The purpose of this study is to apply the CPM (Critical Path Method) method to predict and optimize the project's total duration on the scheduling of house construction projects by PT Ghani Sejahtera Abadi. In this research, the method used is quantitative with a descriptive approach. The subjects of this research are project owners and workers who build houses in Kedungrandu Regency Housing. Sources of data needed to meet the criteria for data that CPM can analyze include: (a) data on the name of the activities in the project, (b) the sequence of activities on the project, and (c) data at the time used in the house construction project. For data collection in this study using several techniques, namely interviews and literature study. Based on the results and discussion of this research, the following conclusions are obtained: (1) Critical Path Method (CPM) can be used to schedule optimal, fast, and efficient house construction projects. (2) The CPM application causes the completion time of the type 33 house construction project in the Kedungrandu Regency Housing, which was initially scheduled for 64 days to be faster, namely 42 days.
Kepadatan dan Pola Distribusi Kerang Totok (Geloina erosa) di Perairan Wisata Hutan Payau Cilacap Amanda Retnaning Diyah; Any Kurniawati; Dewi Kresnasari
Scientific Timeline Vol. 2 No. 1 (2022)
Publisher : UNU Purwokerto

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Abstract

One of unique biota that lives in Cilacap Mangrove Forest Tourism area is mangrove clam Geloina erosa. Many of these clams are fishing targets by the local community. The clams would be either sold to the market or consumed directly. This study aims to determine the density and distribution pattern of G. erosa in Cilacap Mangrove Forest Tourism area waters, and was conducted in May-June 2021. The research method used was direct observation in the field with purposive sampling technique. There are 3 sampling stations, each of which is observed once every week for 3 weeks. The results shows that the density of G. erosa was 301 ind/m2, 15 ind/m2 and 4 ind/m2 at stations 1, 2, and 3 respectively. The distribution pattern of G. erosa at each observation station was a clustered distribution.
PERBAIKAN MUTU HASIL BIBIT BAWANG MERAH ASAL BENIH DENGAN PERLAKUAN KOMPOS GERGAJIAN KAYU DAN PUPUK KIMIA PABRIKAN Rifqi Adisonda
Scientific Timeline Vol. 2 No. 1 (2022)
Publisher : UNU Purwokerto

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Abstract

Sengon wood sawdust compost that is given a bioactivator can be a solution for the low production of shallots in Indonesia. By doing this research, it is hoped that information can be obtained regarding the effect of compost, chemical fertilizer manufacturers and the effect of the combination treatment of the two fertilizers on the growth, yield, and quality of shallots. The research method used was RAKL with 2 factors, namely the application of sawn compost of sengon wood (P2) Monodon [0,2 ml/l]; (P5) Monodon+Stardec [0.2 ml/l+3.8 g/l]; (P6) EM4+Monodon+Stardec [36 ml/l+0.2 ml/l+3.8 g/l]; and application of doses of Urea, ZA, SP36 and KCl (T0) 150, 150, 120, 150 kg/ha, respectively; (T1) 359, 359, 511, 115 kg/ha; (T2) 269, 269, 383, 86 kg/ha; (T3) 179, 179, 255, 57 kg/ha. The results of the study explained that the variable number of leaves had no significant effect on the treatment of compost, chemical fertilizers or their combination. Plant height and tuber hardness significantly affected the chemical fertilizer treatment (T2), respectively 37.56 cm/plant and 3.82 g/cm2. The weight of dry tubers significantly affected the compost treatment (P5), each of which was 29.42; 17.46; 21.71 and 16.11 g/plant. Observation of the quality of shallot yields, tuber diameter of all treatments included in quality I. tuber moisture content of all treatments did not fall into the quality category. Observation of the results of FTIR analysis, for (P6), (T3) and (P6T3), respectively (274 and 464 ppm), (340 and 575 ppm), (371 and 628 ppm).
STRUKTUR KOMUNITAS ZOOPLANKTON PADA PERAIRAN MANGROVE LAGUNA SEGARA ANAKAN CILACAP Nur Kholifah; Eti Wahyuningsih; Dewi Kresnasari
Scientific Timeline Vol. 2 No. 1 (2022)
Publisher : UNU Purwokerto

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Abstract

This study aims to determine the diversity of zooplankton and its connection to the quality of the mangrove waters of Segara Anakan Lagoon, Cilacap. This research was conducted from July to September 2021. The data was collected using a survey method with purposive random sampling, where the research stations were selected based on certain criteria and zooplankton samples were collected from 3 observation stations. Sampling was carried out at low tide. Zooplankton was collected using plankton net. The results showed that the types and diversity of zooplankton found in the mangrove waters of Laguna Segara Anakan Cilacap consisted of four phyla which were annelids, arthropods, protozoa, and rotifers. Only one genus found from the phylum annelids, namely polychaeta. There were six arthropods genera consisting of daphnia, microstela, nauplius, euterfina, diaphanossoma, and oithona. The phylum Protozoa consists of one genus, astramoeba, while the phylum rotifera consists of two genera, Branchionus and Notholca. The abundance of zooplankton at Stations 1, 2, and 3 were 1.61 ind/l, 1.84 ind/l, and 1.41 ind/l, respectively. Zooplankton diversity is influenced by aquatic environmental conditions such as air temperature, water temperature, dissolved oxygen, water pH, salinity, and TSS.
SURVEILANS HAMA UTAMA DAN PENGENDALI EKOSISTEM ALAMI ENTOMOPATOGEN DI SENTRA BUDIDAYA JAGUNG KECAMATAN SUMBANG, KABUPATEN BANYUMAS Nur Kholida Wulansari; Ratna Dwi Hirma Windriyati; Larin Tikafebrianti
Scientific Timeline Vol. 2 No. 1 (2022)
Publisher : UNU Purwokerto

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Abstract

Corn is a food crop that replaces rice. The nutrients contained in corn include carbohydrates, protein and some dietary fiber content needed by the body, such as Ca, Mg, K, Na, P, Ca and Fe. In an effort to increase corn production, there are many obstacles, one of which is the presence of pests. The pests that attack corn include the caterpillar pest (Spodoptera sp.). This research was carried out from June to September 2021 at the Corn Crop Cultivation Center, Sumbang District and the Integrated Laboratory of the Nahdlatul Ulama University, Purwokerto. The population of Spodoptera in the Subdistrict of Sumbang is Spodoptera fugiperda. The highest intensity of S. frugiperda attack was 74.6%. The high intensity of the attack is influenced by the age of the plant, the variety, and the cultivation method carried out by the farmer. The high dose of synthetic pesticides used by farmers makes it difficult to find the presence of entomopathogens. The entomopathogen found in the research area was Metharizium rileyi.
ISOLASI DAN KARAKTERISASI UMUM MIKROBA YANG DIDUGA ENTEROBACTERIACEAE PADA JAJANAN DI WILAYAH PURWOKERTO MENGGUNAKAN MEDIUM EMBA Neli Oktaviani; Indah Sulistiyawati; Nur Laila Rahayu
Scientific Timeline Vol. 2 No. 1 (2022)
Publisher : UNU Purwokerto

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One of the foods that people often consume is street food. Street snacks are often an intermediary for the spread of disease due to the contamination of pathogenic microorganisms. One of the pathogenic microorganisms that can cause disease in humans is Escherichia coli bacteria. This study identified the presence of Enterobacteriaceae pathogen bacteria in roadside snacks in the Purwokerto area, Banyumas Regency. This research is a qualitative descriptive study with a purposive sampling method. The roadside snacks used in this study were snacks with fish-based ingredients, namely dumplings, meat-based ingredients, meatballs, and snacks with egg-based ingredients, namely egg rolls. Snack samples were tested by dilution to a level of 10-5 and inoculated into a dish containing EMBA media. Identification of Enterobacteriaceae bacteria was carried out by observing colony morphology, several colonies, and gram staining. The results obtained showed that 9 out of 18 samples were positively contaminated with Escherichia coli bacteria. The sample that contains the most Enterobacteriaceaebacteria is the sample with the basic ingredient of fish, namely siomay code S PU A1 with the number of colonies 15x1065.
UPAYA PENINGKATAN KANDUNGAN MINYAK ATSIRI PADA BAWANG MERAH VARIETAS TUK-TUK DENGAN PERLAKUAN BERBAGAI MACAM DOSIS PUPUK KIMIA PABRIKAN Rifqi Adisonda; Bagus Nur Rochman; Bayu Handoko
Scientific Timeline Vol. 2 No. 2 (2022)
Publisher : UNU Purwokerto

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Abstract

The aims of the study are to determine the effect of various manufactured chemical fertilizers on the increase of the essential oil content in Tuk-tuk and to determine which treatment is best to increase the essential oil content of this particular variety of shallots. The study used a non-factorial randomized block design with three treatments, and each was repeated nine times. The treatments' dosages were B1: ZA 50kg/ha; Urea 25kg/ha; SP36 250kg/ha and KCl 25kg/ha, B2: ZA 100kg/ha; Urea 50kg/ha; SP36 300kg/ha and KCl 50kg/ha, B3: ZA 150kg/ha; Urea 100kg/ha; SP36 350kg/ha and KCl 100kg/ha. The growth and yield observation variables in this study were the number of leaves (fruit), plant height (cm), leaf area (cm2), tuber diameter (cm), fresh plant weight (g), dry plant weight (g), fresh tuber weight (g), dry tuber weight (g), essential oil content (%). The data obtained were analyzed using the F-test, and then the data showed a significant effect proceeded with the DMRT test at a level of 5%. The results of the F-test on the shallots' observed growth and yield variables were not significantly affected by the treatment of manufactured chemical fertilizer. Meanwhile, B3K5 treatment with B3 dose: ZA 150kg/ha; Urea 100kg/ha; SP36 350kg/ha, and KCl 100kg/ha were the best treatments to increase the essential oil content in the Tuk-tuk variety.
ANALISIS PENCEMARAN ORGANIK DI PERAIRA¬N PELABUHAN PANGKAL BALAM BERDASARKAN HUBUNGAN KONSENTRASI BOD, COD, DAN TOC DENGAN INDEKS KEANEKARAGAMAN MAKROZOOBENTOS Intan Tri Aryani; Mohammad Agung Nugraha; Aditya Pamungkas
Scientific Timeline Vol. 2 No. 1 (2022)
Publisher : UNU Purwokerto

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Abstract

Activities around the waters of Pangkal Balam Harbor can produce organic waste in rivers, estuaries, to the sea which has the potential for negative impact on water quality. Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Organic Carbon (TOC) of sediment are parameters for the amount and organic matter. The purpose of this study was to determine the concentration, criteria, and the pollution status of BOD, COD, and TOC based on the relationship between BOD, COD, and TOC to the macrozoobenthos diversity index (H'). The sampling method was decided based on purposive sampling location with distinct activities. Sampling was carried out in March 2021 in Pangkal Balam Port Waters. BOD analysis using titration method, COD analysis using closed reflux method spectrophotometrically, and TOC sediment using Loss On Ignition method. The results of the study showed that the concentration of BOD ranged from 8.2-12.5 mg/l, COD ranged from 187.23-270.23 mg/l, and sediment TOC ranged from 0.829-18.875%. The relationship between BOD and COD with the diversity index is not significant so that the condition of the waters of Pangkal Balam Port based on the BOD and COD parameters can be said to have not been polluted. Meanwhile, the relationship between the TOC of sediment and the diversity index shows a significant effect so that the status of organic matter pollution based on the TOC is in the polluted status.
PERTUMBUHAN DAN SINTASAN LOBSTER AIR TAWAR (Cherax quadricarinatus) PADA SALINITAS YANG BERBEDA Denny Indra Yudhistira
Scientific Timeline Vol. 2 No. 2 (2022)
Publisher : UNU Purwokerto

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This experiment aims to find the data and information on suitable salinity for the growth and survival rate of freshwater lobster (red claw). The research was conducted in indoor station Kalikidang, Sokaraja, Banyumas, for 28 days. Twelve aquariums were used in this research, and the dimensions were 60x40x40 cm. In this experiment, a complete randomized design was used. The treatments applied were of different salinity, i.e., A: 0 ppt, B: 5 ppt, C: 10 ppt, and D: salinity of 15 ppt, with three replicates, respectively. The average size of the juvenile freshwater lobsters used in this experiment was 5±0,82 cm carapace width and 4,49±1,34 g body weight. During the rearing, the crabs were fed with commercial artificial feed and given twice a day, with a dosage of 15% of total body weight. The determined parameters were length, body weight, and survival rate during the experiment. The result showed that the treatment of 0-5 ppt salinity was significantly different in the growth of length and body weight and survival rate of freshwater lobster reared in the aquarium (P<0,05). The salinity of 0-5 ppt was the optimum salinity for the growth and survival rate of the red claw.
LAJU SEDIMENTASI DI PERAIRAN KURAU, KABUPATEN BANGKA TENGAH Rismawati; Aditya Pamungkas; Mohammad Agung Nugraha
Scientific Timeline Vol. 2 No. 2 (2022)
Publisher : UNU Purwokerto

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The estuary of the Kurau Watershed (DAS) has domestic activities. The problem that commonly occurs in river mouths is the emergence of sediment, which causes disruption of water flow upstream and can cause flooding. Kurau waters have considerable water resources, but it is also decreasing year on year. This study aimed to determine the sedimentation rate, TSS, and the type of sediment texture in Kurau waters, Central Bangka. Sedimentation rate data was obtained using a sediment trap. Analysis of TSS (Total Suspended Solid) and sediment texture using gravimetric and pipette methods. The sedimentation rate in Kurau waters is not high based on weight, namely 0.03-0.14 mg/cm²/day, and volume with a value range of 0.13-0.58 cm/day. The concentration of TSS on the surface of Kurau waters based on PP no. 22/2021 has not passed the seawater quality standard with a TSS concentration of 0.03-0.04 mg/L. Kurau waters have various types of sediment texture, namely sand with a percentage ranging from 6.54-78.33%, dust with a percentage of 14.72-45.74%, and clay with a percentage of 6.94-47.72%. The sedimentary textures in Kurau waters are dusty clay, loamy sand, and loamy clay.

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