Judul: Karakteristik Fisik Tanah dan Dinamika Kadar Air Tanah pada Berbagai Penggunaan Lahan (Studi Kasus : Kebun Percobaan Cikabayan)
Abstrak: The water supply in dryland agriculture relies on rain water. Erratic rainfall which is often compounded by high intensity of sun light causes a high evapotranspiration, so that soil water is significanly decrease. Changes in soil water levels is variable depending on land use type and is affected by various factors. The dynamic of soil moisture content is then strongly influenced by rainfall pattern and physical characteristic of soil, where the soil characteristic itself is influenced by land use type. This study aims to determine physical characteristic of soil and dynamic of soil water in various land use and rainfall in The Experiment and Research Garden of Cikabayan, IPB, Dramaga, Bogor. Each land use has different permanent wilting point and soil water level due to difference in density of canopy or the depth of soil layer. The field soil moisture content under oilpalm is still higher than the permanent wilting point although no rain for eight days. It may be caused by the dense canopy of palm trees which can reduce the rate of evaporation. The field soil moisture content under citrus fall below the wilting point at the sixth day after rain (on 10-30 cm layer) and the eighth day after rain (30-50 cm layer), while soil under annual crop is still possibly providing water supply even though no rain for eight days .
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Judul: Karakteristik sifat fisik dan hidrologi tanah pada berbagai penggunaan lahan: studi kasus di desa cimulang, kecamatan rancabungur, kabupaten Bogor, provinsi Jawa Barat
Abstrak: The increasing population has caused increasing pressure over land utilization that has lead to more conversion of forest land into agriculture land (dry farm and plantation). This land conversion degrades land quality as indicated by decreasing quality of soil physical properties, decreasing of water infiltration, and increasing of runoff. A research to study soil physical and hydrology characteristics on mixed farm, oil palm plantations, and dry farm was carried out in Cimulang village, Rancabungur District, Bogor Regency. The study was conducted on different slope, i.e. 0-5%, 5-8% and 8-15% in the same soil type. Parameters observed in this study were infiltration capacity, hydraulic conductivity, bulk density, porosity, pore drainage, and soil ability to hold water (fiels capacity, available water, and fiels water content). Measurements of bulk density, porosity, pore drainage, and the ability of soil to hold water are done in the laboratory using undisturbed soil samples. Meanwhile, the measurements of infiltration and hydraulic conductivity were done in the field. The result shows that dry farm has the lowest quality of soil physical and hydrology as indicated by the highest bulk density and low porosity, macro pores, infiltration, and hydraulic conductivity. Land of oil palm has lower quality of soil physical than mixed farms. The quality of soil physical in mixed farms is better due to greater amount of plant residue and unintensive soil management that makes the land remains protected with minimum soil damage. The above result proved that the main factor affecting the soil physical properties and hydrology are the intensity of soil management, the quantity and quality of plant residue and organic material.
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Judul: Infectious laryngo tracheitis pada unggas
Abstrak: Infectious Laryngo Tracheitis merupakan penyakit pada unggas yang disebabkan oleh virus yang mempunyai sasaran saluran pernapasan bagian atas Penyebab penyakit Infectious Laryngo Tracheitis Univers (ILT) adalah virus yang termasuk kelompok virus Herpes sering disebut Tarpeia avium. Virus tersebut tersusun dari inti asam deoksi ribonukleat yang dilengkapi dengan pembung- kus yang merupakan derivat dari lemak serta mempunyai garis tengah antara 195-250 nano meter. Pada temperatur kamar virus tersebut dapat bertahan selama 15 hari dalam keadaan tanpa pengawetan. Virus penyebab Infectious Laryngo Tracheitis mempunyai kepekaan terhadap zat kimia golongan pelarut lemak seperti: phenol dan kresol. Induk semang definitip penyakit Infectious Laryngo Tracheitis adalah ayam, tetapi burung merak, itik dan kalkun pernah dilaporkan dapat terinfeksi. Mammalia dan golongan rodensia merupakan hewan yang tahan terhadap infeksi penyakit ini. Pada manusia penyakit Infectious Laryngo Tracheitis diduga mempunyai hubungan dengan timbulnya gangguan neuralgia yang bersifat sub-akut akibat infeksi virus Herpes jenis lain yang disebut virus Sub-acute Myelo Optico Neuropathi (virus SMON).
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