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Daerah istimewa yogyakarta
INDONESIA
Jurnal Sains Dasar
Published by Universitas Negeri Yogyakarta
ISSN : 20859872     EISSN : 24431273     DOI : 10.21831
Core Subject : Education,
Education
Arjuna Subject : -
Articles 13 Documents
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Search results for , issue "Vol 3, No 1 (2014): April 2014" : 13 Documents clear
The diversity of saprophytic fungi on agricultural land in Wukirsari, Cangkringan, Sleman, Yogyakarta Siti Umniyatie; Victoria Henuhili
Jurnal Sains Dasar Vol 3, No 1 (2014): April 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (84.94 KB) | DOI: 10.21831/jsd.v3i1.2798

Abstract

This research aims to 1) examine the total amount of fungi, 2) the diversity of top soil saprophytic soil fungus, and 3) the abiotic soil factor that is believed to influence the diversity of fungi genus in the village of Wukirsari, Cangkringan, Sleman, Yogyakarta. This is an exploration research using the soil from agricultural land in the village of Wukirsari, Cangkringan, Sleman, Yogyakarta as sample through stratified random sampling. Sample is taken from the top soil in zone A, B, and C. The total amount of fungi are obtained using the pour plate method by dilution technique up to 10-8 , while edaphic factors are determine through soil tester. The measurement of soil organic C is using Walked and Black method while as for N total and P total using Kyeldal and HCL 25%, respectively. Soil fungus identification is conducted by identifying microscopic and macroscopic characteristics and subsequently the results are compared to Compendium of Soil Fungi. This research shows that there are variations of the amount and genus of fungi found in the sample. Zone B has the highest total of fungi, 35 x 105 cfu/gram while zone A and C has 14 x 105 cfu/gram and 2.4 x 105 cfu/gram, respectively. There are 24 isolate fungi that belong to 10 genus, namely: Penicellium sp., Humicola sp, Mucor sp, Fusarium sp, Acromonium sp Cochliobolus sp, Botrytis sp. and Mycothecium sp.. Zone B has the same diversity with zone A, and zone C has lower diversity. The diversity is determined by the soil edaphic, in particular humidity. While the content of organic C, N, and P do not appear to influence the diversity of the genus of fungi.
The enhancement effort of chili’s resistance to water stress & disease by application of priming technique Roektiningroem, Ekosari; Djukri, Djukri
Jurnal Sains Dasar Vol 3, No 1 (2014): April 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (129.753 KB) | DOI: 10.21831/jsd.v3i1.2799

Abstract

This research aims to know the influence of chili’s seed priming on improving germination, growth, and development in the field, before, during, and after stress conditions (water stress and disease). Priming is a technique of seed pretreatment with osmoticum solution or moist solids, which allows slow inbibition; thus radicals emergence and growth are prevented. It is a simple and easy technique to apply, which can increase the germination, and performance or vigour in a broad spectrum. Implementation is in three trials, each trial consisting of 2 stages. The first stage on the early experiment was priming (priming treatment with 4 days incubation and priming test), and the second stage was the germination (germinating the seed that has been treated by priming and germination test). The first stage on the further experiment is priming and the second stage were growth and development test before, during, and after the stress conditions. The results showed that seed priming treatments can maintain and improve the quality of seeds, and increase germination, both germination percentage and germination rate, as well as enhance the growth of plant height and total leaves of Chili at age 2 wat (weeks after transplanting). Key word: priming technique, disease, water stress, plant resistance
Microtremor characteristics and analysis of seismicity on Opak fault lines, Bantul district, Yogyakarta Merizka Marsyelina; Nugroho Budi Wibowo; Denny Darmawan
Jurnal Sains Dasar Vol 3, No 1 (2014): April 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2254.022 KB) | DOI: 10.21831/jsd.v3i1.2800

Abstract

This research aimed to determine the microtremor characteristics and seismicity analysis around Opak’s fault in  Jetis subdistrict, Imogiri subdistrict,  Pundong  subdistrict, and Kretek subdistrict. This research using HVSR (Horizontal to Vertical Spectral Ratio) method, spectrum analysis, TFA analysis and maximum likelyhood method. The primary microtremor’sdata was taken from 9 points and thesecondary data from 32 point using grid 3 km spacing. The data record the natural waves or seismic signals at each measurement points. The processed data thus characterize the structrure of the soil and rock layers. For seismicity of analysis earthquake data since 2006-2014 from BMKG were used. The results indicate microtremor characteristics around the fault Opak according to the parameter map predominant frequency modeling result, map predominant period modeling result, map amplification factor modeling result, map Vs30 modeling result, curve H/V, curve spectrum and curve TFA which is divided into three zones. Seismicity analysis showed that earthquake around Opakfault earthquake has magnitude between  0,4 to 3,2,  has a depthof 10 km to 20 km, and has a  b-value of 0,44 to 0,76.   Key words: HVSR method, TFA analysis, spectrum analysis, maximum likelihood method, microtremor characteristics, b-value, Opak fault

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