Judul: Analisis Hubungan Sifat Fisik dan Sifat Mekanik Pada Kegiatan Pengolahan Tanah di PT Laju Perdana Indah, Sumatera Selatan
Abstrak: Plants can grow and get maximum production on the optimal soil conditions. Plant growth and application of agricultural machinery is affected by soil physical and mechanical properties. Processing of land to achieve the ideal conditions for plants to grow. The purpose of this study is to analyze the relationship between physical and mechanical properties of soil cultivation and processing methods to determine the most effective ground. Processing methods applied are common plowing methods and methods Trash In Corporation. The results showed that methods Trash In Corporation created a density of soil at a depth of 20-30 cm after ridgering. While the usual method of plowing is not very effective to achieve weight mean diameter. From the land preparation results can be analyzed that the soil moisture content increases with increasing soil depth, this is caused because of evaporation due to heat of the sun. From the sample data before tilling the soil shear strength of the relationship visible soil depth, the deeper the soil sample then sliding the power factor will be reduced due to declining soil density at depth intervals deeper and deeper. Data on average cohesion and friction angle obtained in the shear strength test was obtained from the percentage factor of clay and sand fraction, increasingly clay fraction then the value will be greater cohesion as well as sand fraction greater the friction angles obtained in .
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Judul: Analysis of Soil Physical Properties in Four Land Uses in Sukamantri Research Station, IPB University
Abstrak: Pemanfaatan lahan sebagai kebun berpengaruh terhadap perubahan sifat fisik dan kekuatan geser tanah. Perubahan tersebut terjadi akibat kegiatan pengolahan tanah. Pengolahan tanah dilakukan untuk menciptakan kondisi tanah agar sesuai bagi pertumbuhan tanaman. Sistem perakaran tanaman tidak dapat berkembang dengan baik pada tanah yang mengalami pemadatan. Penelitian bertujuan melihat pengaruh penggunaan lahan terhadap sifat fisik dan kekuatan geser tanah serta keterkaitan sifat fisik tanah terhadap kekuatan geser tanah dengan studi kasus di Kebun Percobaan Sukamantri IPB. Hasil penelitian menunjukkan lahan penelitian memiliki kelas tekstur lom berklei. Sifat fisik dan C-organik pada penggunaan lahan buah naga, murbei, dan pisang berbeda nyata dengan penggunaan lahan durian. Pada tanah yang diolah, kadar C-organik, porositas tanah, dan kemampuan retensi air tanah lebih tinggi, sedangkan, bobot isi, bobot jenis partikel, indeks stabilitas agregat, ketahanan penetrasi, dan kekuatan geser tanah menunjukkan nilai yang lebih rendah. Hal ini berkaitan dengan sifat andik pada Andisol. Pada kadar air kapasitas lapang, penggunaan lahan durian memiliki nilai kekuatan geser 46,38 kPa, penggunaan lahan buah naga 41,43 kPa, penggunaan lahan murbei 39,36 kPa, dan penggunaan lahan pisang 38,23 kPa. Pada kadar air titik layu permanen, penggunaan lahan durian memiliki nilai kekuatan geser 74,69 kPa, penggunaan lahan buah naga 64,04 kPa, penggunaan lahan murbei 66,23 kPa, dan penggunaan lahan pisang 65,98 kPa., Land used for agriculture research station may lead to changes in soil physical properties and shear strength. Changes occur as a result of land management activities. Soil tillage is done to create soil conditions that are suitable for plant growth. The root system of plants cannot develop properly in compacted soil. This study aims to examine the effect of land use on soil physical properties and shear strength and the relationship between soil physical properties and the shear strength with a case study at Sukamantri Research Station, IPB University. The results showed that soil texture of the research station is clay-loam. Physical properties and C-organic content of dragon fruit, mulberry, and banana land use were significantly different from land use of durian. In tillaged soil, C-organic content, soil porosity, and water retention are higher, while, bulk density, particle density, aggregate stability, soil penetration resistance and soil shear strength are lower. This is related to the andic properties of Andisol. Durian land use has a shear strength value of 46,38 kPa, followed by dragon fruit land use 41,43 kPa, mulberry land use 39,36 kPa, and banana land use 38,23 kPa at field capacity water content. At permanent wilting point, durian land use has a shear strength value of 74,69 kPa, dragon fruit land use 64,04 kPa, mulberry land use 66,23 kPa, and banana land use 65,98 kPa.
Keyword: land use, soil physical properties, soil shear strength

Judul: Infeksi Virus Parainfluenza Pada Anjing
Abstrak: Virus parainfluenza anjing termasuk famili Paramyxoviridae, berbentuk pleomorf dengan ukuran bervariasi (bergaris tengah antara 100-500 nm), berpembungkus peka ether, berisi genom RNA dan secara serologis mempunyai kesamaan dengan virus SV-5 kera; dikenak sebagai salah satu kausa penting dari sindrom "kennel cough". Infeksinya dapat mengenai anjing semua umur yang belum pernah terinfeksi atau mendapatkan vaksinasi mengakibatkan gejala klinis ringan yang terbatas pada traktus respirasi atu infeksi yang secara klinis tidak memperlihatkan gejala nyata. Gejala klinis yang nampak setelah masa inkubasi (1-5 hari) terlewati berupa batuk yang tidak berat selama beberapa hari, berbagai tingkat tonsilitis dan pharyngitis dan kadang-kadang ditemukan kenaikan temperatur rektal antara 1-2 derajat C dari temperatur normal rat-rata. Anjing terinfeksi mengandung virus pada traktus respirasi bagian atas dan bawah serta limfonoduli sampai hari ke 9 setelah infeksi. Penyebaran virus antar anjing terjadi secara aerogen.
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