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Widyariset
Published by Pusbindiklat Peneliti LIPI
ISSN : -     EISSN : 24610976     DOI : 10.14203
Core Subject : Science, Engineering,
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Widyariset is a scientific journal which publishes the results of research and development, assessment, and systematic thinking about Natural Science.
Arjuna Subject : Umum - Umum
Articles 15 Documents
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Search results for , issue "Vol 17, No 2 (2014): Widyariset" : 15 Documents clear
STUDI KARAKTERISTIK STOMATA BEBERAPA JENIS TANAMAN REVEGETASI DI LAHAN PASCAPENAMBANGAN TIMAH DI BANGKA Lina Juairiah
Widyariset Vol 17, No 2 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.17.2.2014.213-217

Abstract

Study on stomatal characteristics of some reclamation plants in the post tin-mining land in Bangka was conducted based on Wholemount method. According to the classification of stomata density, Trema orientalis, Commersonia bartramia, and Syzygium garcinifolium were belong to high density category (> 500/mm2), while stomatal density V. pinnata was in the category of medium density (300-500/mm2). The average length of stomata T. orientalis, V. pinnata, and S. garcinifolium include length size (20-25 µm) criteria, while C. bartramia include long enough size (< 20 µm). Based on characteristics that the four types of stomata plants show V. pinnata grown more adaptive of post tin -mining land in Bangka compared with T.orientalis,C. bartramia, and S. garcinifolium.
PENENTUAN PRIORITAS PENANGANAN LAHAN KRITIS DI KABUPATEN SUKABUMI Yanuar Argo
Widyariset Vol 17, No 2 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.17.2.2014.251-258

Abstract

Land degradation level can be identified by calculating Erosion Hazard Classification (EHC) and Population Pressure (PP) because these two factors are interrelated with the occurrence of land degradation. This research aims to determine the spatial distribution of management priority for degraded land using GIS based on EHC and PP with three models of scenario based on different influence of interest. The results of those three scenarios displayed that the first priority for degraded land management were located at four villages with a total area of 296.34ha. The largest village was Selajambe village, Cisaat District, Sukabumi Sub-development Area (SDA) with 132ha or 0.49% of the total research area. The second priority covered at 113 villages with a total area of 9400.69ha. Sukaraja village, Sukaraja district, Sukabumi SDA had the largest area percentage of 1.33% or 360ha of the total research area.
RESISTENSI PLASMA NUTFAH IRRDB 1981 TERHADAP PENYAKIT GUGUR DAUN Corynespora Alchemi Putri Juliantika Kusdiana; Fetrina Oktavia
Widyariset Vol 17, No 2 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.17.2.2014.175-181

Abstract

Leaf fall disease caused by Corynespora casiicola can damage the rubber resulting in considerable economic losses. The opportunities to get rubber plant genetic resources that are resistant to leaf fall disease Corynespora casiicola have been made   by testing the resistance of some germplasm IRRDB 1981. Testing the resistances of some germplasm is to produce genetic resources that are resistant to leaf fall diseases and used as parents in the crossing. Testing was done by using immersion leaves method in a solution of toxin C. casiicola. Resistance testing of 28 genotypes germplasm IRRDB 1981 showed various resistance responses. The results indicated that there were five genotypes that had moderate resistant which were PN 323, PN 333, PN 448, PN 494, and PN 593, and one genotype PN 235 showed highly resistant. The six genotypes needed to be tested in the field to determine their interaction with the environment and then used as cross parents to obtain resistant parentage to C. casiicola leaf fall disease.
POLA PENYEBARAN SEDIMEN TERSUSPENSI BERDASARKAN ANALISIS DEBIT MAKSIMUM DAN MINIMUM DI MUARA SUNGAI PORONG, KABUPATEN PASURUAN Herna Octivia Damayanti; Undang Hernawan
Widyariset Vol 17, No 2 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.17.2.2014.291-301

Abstract

Porong estuary is a place where materials transported along the river have been accumulated as well as Sidoarjo sludge. The amount of sediment in the estuary causes high turbidity levels of the river. The objective of this study is to determine the pattern and the concentration of Total Suspended Solid (TSS) spreading in Porong estuary for 15 days with SED2D models from software SMS 8.1 using maximum and minimum riverflow input, thus, the model results that are closer to reality in nature can be obtained. Tides, currents, and TSS were used as primary data sources, while Porong riverflow, Juanda wind and bathymetry maps Java-North Coast Surabaya to Bali Strait scale 1: 200.000 Sheet V No.82 year 2006 as secondary data sources. The results of the research showed that the concentration of TSS spreading for maximum riverflow 248–158 mg/l and minimum riverflow input 248–160 mg/l with spreading pattern tend to go to southeast direction. TSS concentration spreading model verification indicates that the model with the maximum riverflow data input has smaller MRE value than the model with the minimum riverflow.
EFIKASI INSEKTISIDA NABATI DALAM MENGENDALIKAN KUTU KEBUL, Bemisia tabaci GENN. (HOMOPTERA: ALEYRODIDAE) Kurnia Paramita Sari; Suharsono Suharsono
Widyariset Vol 17, No 2 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.17.2.2014.219-225

Abstract

Yam bean, neem, and nicotiana are natural pesticides for insect. Whitefly Bemisia tabaci Genn. is a pest and could decrease in soybean yield up to 80%. The aim of this research was to study the effectiveness of natural pesticides in controlling white fly. The research was carried out in ILETRI screen house and arranged in a 3 x 3 factorial randomized design with four replicates. Fisrt factor was three natural pesticides of yam bean, neem, nicotiana while the second factor was the time of aplications (two week after planting (WAP)-harvested), (2 WAP- floweres), (floweres-harvested). Dosage of each yam bean, neem or nicotin was 50 ml/l. Natural pesticides were sprayed over leaves. Parameters of whitefly population and injury intensity were observed. The result showed that whitefly population was lower in neem aplication (113 whitefly/3 leave trifoliate) and increased in control (684 whitefly/3 leave trifoliate), yam bean aplication (182 whitefly/3 leave trifoliate ) and nicotiana aplication (163 whitefly/3 leave trifoliate ). There was not interaction the kind of natural pesticides with time of application. This study shown that the neem natural pasticide at 2 WAP until harvest is effective in controlling the whitefly.

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