Judul: Diversity of Soil Characteristics in Field and Its Relation with Landform Spatial Pattern at Agrotechnopark Koleberes, Cianjur
Abstrak: Soil mapping in detail scale needs a high intensity of observation and costly. To decrease the cost, the mapping usually done using an approach of delineation of soil forming factors into homogeneous sets. This approach is based on an assumption that if soil forming factors are homogeneous then the soil characteristics will also homogeneous. However various survey experiences indicated that at sloping areas, soil characteristics still vary although soil forming factors show a high homogeneity. The aim of this research is to study soil characteristics observed from boring with a high observation intensity and to search for a spatial relation between soil characteristics and classification with spatial distribution of landform at a slopping areas. Materials of this research comprised contour map, geology map, existing soil map and soil data covering profile description and its of physic and chemical data. GIS software (Arc View GIS 3.3) was used for spatial analysis of landform. In this research, landform are delineated based on an 1:1000 contour map considering the concept of “Model Diagram of Nine Land Surface” of Dalrymple et. al. (1968; in Darmawan, 1987). Field characteristics of soil were obtained from borings taken at the close distances along slope transects. Observation conducted at some slope transects across various landforms. Soils on research location formed from parent material which is relatively homogeneous under the influence of the same climate, organism and times. Meanwhile relief/ topography shows a high heterogeneity, with differences that even happened at a narrow space. This heterogeneity is reflected by existence of various landform i.e. convex-rather flat-upper slope, straight-flat to rather steep middle slope, concave-rather steep lower slope, etc. Soil field characteristics obtained from boring observation at close distances show very high variations as shown by variation in composition and depth of horizon A and B, soil colour, texture and consistency. This phenomenon could affect the soil classification at family and series level. Toposequently, from upper slope (convex) through the mid slope (straight), to the lower slope (concave) had a tendency to have more complex horizon composition. This phenomenon was due to the dominant process of erosion at the upper slope, and deposition at the lower slope.
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Judul: Studi Korelasi Antara Tanah, Lahan, Dan Pertumbuhan Jagung Secara Toposekuen Di Desa Karyamekar, Kecamatan Cariu, Kabupaten Bogor
Abstrak: According to van Wambeke and Forbes (1986) land unit is a placement of land unit because their mostly same genetic factor (biotic and abiotic) and genesis process. Soil is closely related with landscape and landform, so different land unit (system, subsystem, and landform category) is also different in soil unit, probably as a soil of each category (order, suborder, great group, subgroup, family, and a soil series) mentioned the processes ofland and soil genesis. Differences in soils reflect differences in soil properties and characteristics, which determine differences potency and use. Therefore, knowledge on soil properties, characteristics, and soil classification is needed. This research was intended for conducting correlation study between soil, land, and corn growth on the toposequence in volcanic landscape. The objective was producing correlation data between soil families, landform, and the growth of hybrid corn CPI 2 on the toposequence. This research used soil classification method based . on Keys to Soil Taxonomy (Soil Survey Staff, 2006) up to the family category, landform cassification (Desaunettes, 1977), and corn crop performance test with block domized design. Landscape in the study area was divided into three landforms based on position and slope of the land, namely peak (PI), slope (P2) and valley (P3). Based on Soil Taxonomy USDA (2006) and landform classification (Desaunettes, 1977), Pedon PI belong to Typic Kandiudox, very fine, kaolinitic, acid, isohyperthermic, within rolling volcanic plain, andesite parent material, levelland, not incised landform (Va.2.1.0), Pedon P2 belong to Inceptic Hapludox, very fine, kaolinitic, acid, isohyperthermic, within rolling volcanic plain, andesite parent material, rolling, not incised landform (Va.2.2.0), Pedon P3 belong to Typic Kandiudox, very fine, kaolinitic, acid, isohyperthermic, within rolling volcanic plain, andesite parent material, levelland, not incised landform (Va.2.1.0). Based Duncan's test that were not affected by differences in block (degree of slope), because of the same name up to suborder.
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Judul: Pengklonan gen VP28 Penyandi Viral Protein-28 dari virus white spot syndrome sebagai langkah awal produksi vaksin rekombinan udang penaeid
Abstrak: Usaha produksi udang dalam negeri saat ini sedang mengalami kendala akibat serangan penyakit white spot syndrome virus (WSSV) pada jenis udang windu (Penaeus monodon). WSSV yang termasuk virus DNA berukuran besar dapat menginfeksi udang dan berbagai jenis crustaceae lainnya. Virus ini merupakan patogen yang sangat ganas dan paling serius menyerang udang. Serangannya begitu cepat, sangat sulit dihentikan dan dapat mematikan 100% udang peliharaan dalam waktu 3-10 hari setelah munculnya gejala klinis. Serangan virus ini juga telah menghancurkan industri udang di berbagai negara. Infeksi WSSV ditandai dengan adanya bintik putih atau bercak putih pada eksoskeleton dan epidermis terutama pada bagian karapas udang. Hingga saat ini belum ada cara tradisionalyang efektif mencegah dan menanggulangi penyakit ini.
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