Judul: Penggunaan getaran dalam usaha menurunkan tahanan tanah (draft) terhadap subsoiler
Abstrak: Kecamatan Penyabungan merupakan salah satu Kecamatan di Kabupaten Tapanuli Selatan, Propinsi Sumatera Utara. di Kecamatan ini telah lama dikenal dan diusahakan pertanian padi sawah secara subsiten tradisional. Walaupun tingkat upaya yang dilaksanakan sedemikian rupa, akan tetapi telah manpu mencukupi pangan tidak. saja bagi Kecamatan Penyabungan,. bahkan dapat mensuplai pangan hingga tingkat Kabupaten. Sebagian besar penduduk (76,78%) bekerja disektor pertanian pangan seperti padi-padian, kacang-kacangan dan ubi-ubian, sedangkan di sektor lain relatif Bangat kecil. Keadaan ini menggambarkan bahwa pertanian di Kecamatan Penyabungan adalah bersifat monokultur pangan. Bilamana pertanian monokultur pangan ini terus diupayakan mempunyai kelemahan terhadap pertumbuhan wilayah, karena kurang dapat menumbuhkan atau membangkitkan aktivitas-aktivitas yang lebih lanjut, disebabkan hasil produksinya langsung dapat dikonsumsi.
Keyword: Physical processes, Soil stabilization

Judul: Perubahan Tahanan Tarik (Draft) Spesifik Pembajakan Pada Berbagai Tingkat Pemberian Pupuk Kandang Di Lahan Percobaan Leuwikopo - IPB
Abstrak: Pengolahan tanah adalah suatu usaha untuk mempersiapkan lahan bagi pertumbuhan tanaman dengan cara menciptakan kondisi tanah yang siap tanam. Pengolahan tanah biasanya menggunakan alat - alat mekanik. Kegiatan pengolahan tanah paling banyak memerlukan tenaga di antara kegiatan - kegiatan budidaya tanaman. Hal ini disebabkan adanya tahanan yang timbul akibat dan tahanan tanah dan beban itu sendiri, gaya pada arab horizontal ini disebut dengan tahanan tarik (draft).
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Judul: Histopatologi Ikan Kerapu Bebek (Cromileptes altivelis) yang Terinfeksi Iridovirus
Abstrak: The humpback grouper (Cromileptes altivelis) is a coral reef fish distributed throughout tropical Asia. The fish has high economic value. However, the production of humpback grouper has been affected by viral diseases including Iridovirus infection. The disease caused mass mortality and decreased the quality and value of humpback grouper. The purpose of this study was to examine the histopathological changes of humpback grouper infected by Iridovirus. The Iridovirus infected grouper samples were received from fish farming in floating net cages in the Mandeh waters, West Sumatra. The fishes showed dark discoloration of the skin, splenomegally and Iridovirus positive PCR test results. The tissues of brain, eye, gill, heart, spleen, intestine, pancreas, liver, kidneys, sceletal muscle, and skin were received in 10% buffered formalin. The histopathological examination showed pathognomonic large intracytoplasmic basophilic inclusion bodies in hematopoietic tissue of spleen and kidney, lymphoid cells were observed in choroid layer of eye and in liver sinusoid. The enlarged cells were present in high numbers in kidney, spleen and liver. Smaller numbers were present in eye, gill, intestine and brain, and none in the heart, pancreas, muscle and skin. Other findings correlated with Iridovirus infection were neuronal ischemic, necrosis of intestinal epithelial cells, necrosis of cardiomyocytes, necrosis of hematopoietic cells of liver and kidney. The literature studies resume that pathogenesis of this viral infection begin with the viral entry through the skin ulcer, then the virus spread systemically in the blood circulation, infect the hematopoietic cells in the spleen and kidney as well as the other cells.
Keyword: pathogenesis, Iridovirus, inclusion body, histopathology, grouper