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Groundwater Occurrence Prediction using Regressions on Morphometric Variables in Upstream Progo Watershed, Yogyakarta T. Listyani; Budiadi Budiadi
Indonesian Journal on Geoscience Vol 5, No 3 (2018)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3300.005 KB) | DOI: 10.17014/ijog.5.3.265-276


DOI: 10.17014/ijog.5.3.265-276Geomorphological mapping has been done at the upstream part of Progo Drainage Area by measuring some geomorphological indexes and level of shallow groundwater level at 196 stations, to investigate connections between geomorphological characteristics and groundwater system in the area. These indexes are valley floor - height ratio (Vf), valley cross section (Vratio o rVr), stream gradient index (SL), and drainage density (Dd). Based on the linear regression analysis, the four indexes show none to very weak correlation to water table at most locations. It means that all width, height, and width of the river valley do not control shallow groundwater level. However, some locations indicate a strong control of elevation to shallow groundwater level. The first case indicates that there is another controlling factor to the shallow groundwater system. Most likely, a deeper aquifer exists at those locations, which does not show up in the second case. All results give a preliminary indication that morphometry can be used to predict groundwater system in the area.
Variability in Morpho-physiology, Tuber Yield and Starch Content of Several Arrowroot Populations in Garut District Asep Rohandi; Budiadi Budiadi; Suryo Hardiwinoto; Eni Harmayani; Dede J. Sudrajat
AGRIVITA, Journal of Agricultural Science Vol 39, No 3 (2017): OCTOBER
Publisher : Faculty of Agriculture University of Brawijaya in collaboration with PERAGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17503/agrivita.v39i3.1002


Arrowroot (Maranta arundinacea L.) is an important starchy plant which has potential utilization for food,industry and medicine. The study was undertaken to assess the variability in morpho-physiological characters, tuber yield and starch content of 23 arrowroot populations in Garut District, West Java. The result showed some significant differences in morpho-physiological characteristics, tuber yield and starch content. Growth characteristics revealed that Cilawu population recorded the highest values for some characters: high, leaf number, above growth biomass and tuber biomass. Cikajang population showed the highest tuber yield (210.6 g per plant) followed by Cilawu population (134 g per plant). Cikajang and Cilawu populations also provided the highest tuber biomass, 46.6 g and 60.0 g respectively. Cilawu population was a second population producing the highest starch content (26.1 %) after Cibatu population (27 %). The higher heritability coupled with genetic advance revealed for fresh tuber yield indicated that selection on basis of the character may be helpful to improve arrowroot yield. Most of the growth characteristics had not significant correlation indicating that the characteristics are not good indicator for selection. Cilawu, Cikajang and Cibatu populations have good potential to produce the high quality and quantity of tuber for arrowroot cultivation in Garut District.
KURVATEK Vol 2 No 2 (2017): November 2017
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v2i2.540


AbstrakPenelitian tentang mataair dilakukan melalui survei geologi airtanah secara langsung di lapangan dengan penekanan pada aspek geomorfologi. Tujuan penelitian adalah  untuk mengetahui karakteristik pengaliran di daerah penelitian. Lokasi penelitian adalah daerah Girimulyo dan sekitarnya, khususnya yang termasuk dalam Kubah Kulon Progo,  yang termasuk dalam Kecamatan Girimulyo, Kabupaten Kulon Progo.  Penelitian ini dilakukan dengan metode survei geomorfologi dengan melakukan pendataan bentang alam yang meliputi lereng, elevasi dan karakteristik mataair secara langsung di lapangan. Hasil survei menunjukkan bahwa beberapa mataair merupakan mataair depresi dimana pemunculannya dikontrol oleh morfologi/topografi, sebagai contoh yaitu mataair Semurup dan Njuboh. Beberapa mataair kontak juga dijumpai di daerah penelitian, dimana mataair jenis ini tidak selalu dikontrol oleh morfologi daerah setempat, walaupun kadang-kadang berada di suatu lereng yang cukup terjal.. Dengan demikian, hubungan lereng dan elevasi tidak selalu signifikan terhadap pemunculan mataair. Kata kunci: geomorfologi, mataair, lereng
Quality of Charcoal Made from Gelam Wood (Melaleuca cajuputi) Alpian Alpian; Tibertius A Prayitno; Gentur JP Sutapa; Budiadi Budiadi
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 9, No 2 (2011): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (334.103 KB) | DOI: 10.51850/jitkt.v9i2.135


Gelam (Melaleuca cajuputi) dominantly found on tidal swamp areas of Central Kalimantan. The study was conducted to investigate the quality of charcoal from stem section based on the grow place, the location of A (flooded of the big tidal, peat thickness is 51-100 cm), location B (unflooded of the big tidal, peat thickness is 101-200 cm), and the stages of tree growth (saplings, poles, and trees). The parameters observed were yield, moisture content, volatile matter content, ash content, carbon content in bound, and calorific value. Charcoal from gelam generally meets the requirement of SNI 01-1683-1989, SNI 06-4369-1996, and Malaysia standards. The average value of the charcoal yield is 28.090-28.545%, the charcoal water content is 4.605-5.413%, the volatile matter content of charcoal is 30.286-34.635%, the ash content of charcoal is 1.840-2.386%, the bonded carbon content of charcoal is 58.37-62.46%, and the charcoal calorific value is 6937.43-7530.09 cal g-1.Key words: biomass energy, calorific value, charcoal, Melaleuca cajuputi