Judul: Design Of Variable Rate Fertilizer Applicator Frame
Abstrak: Frame for variable rate fertilizer applicator has been developed in order to mount the unit with the transplanter. The purpose of this study is to design and analyze its performance in paddy fields. The design of the frame unit was carried out with Computer Aided Design Software based on data obtained through the formulation and refinement of the idea of design and analysis of strength of material. The main function of the frame is to support hopper unit which has 120 kg weight. Variable rate fertilizer applicator unit consisted of four fertilizer hoppers, each equipped with a variable metering device which powered by a DC electric motor. Once designed, then prototype was built and its performance was tested in the experimental paddy field of the Mechanical and Biosystem Engineering Department, Faculty of Agricultural Technology, Bogor Agricultural University. The results of functional test and field performance test showed the designed prototype was function properly and was able to support the load generated by four filled hoppers full of fertilizer (120 kg). Average sinkage on an empty hopper was 21.60 cm, while the average sinkage on filled hopper was 24.74 cm. The average slip for empty hopper was 16.3% while the average slip for filled hopper was 20.2%.
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Judul: Desain dan Kinerja Unit Pemupuk Kedelai Tipe Stepped Pitch Auger Berpenggerak Traktor Roda Dua
Abstrak: Mekanisme perubahan dosis pada unit pemupuk yang dirancang oleh Jamaludin (2016) masih belum berfungsi secara baik. Auger yang digunakan harus diganti guna memperoleh perubahan dosis tanpa mengubah kecepatan putar (RPM) poros auger. Oleh karena itu mekanisme tersebut tidak layak untuk digunakan saat berada di lapang. Solusi desain yang digunakan adalah penggunaan auger dengan tiga jenis ukuran panjang pitch dari auger. Mekanisme perubahan dosis yaitu dengan menggunakan devider yang dapat mengarahkan pupuk ke salah satu auger dengan pitch tertentu dan menutup saluran ke pitch yang tidak digunakan. Devider ini dibuat dengan memperhatikan sudut curah dari pupuk yang digunakan. Hal tersebut bertujuan agar mencegah terjadinya penumpukan atau pengendapan pupuk dan membuang pupuk tanpa termanfaatkan oleh kedelai. Kapasitas lapang dari prototipe ini diukur pada lahan yang telah diolah dan putaran engine 1800 RPM dengan tingkat kecepatan low 1. Kinerja penjatahan pupuk pada dosis 150 kg/ha di lapang oleh unit I, II, III, dan IV rata-rata 7.3, 6.0, 5.0, dan 5.3 g/m dengan keseragaman 12%, 15%, 34%, dan 18%. Kinerja penjatahan pupuk pada dosis 200 kg/ha di lapang oleh unit I, II, III, dan IV rata-rata 8.3, 8.8, 8.1, dan 8.6 g/m dengan keseragaman 11%, 10%, 20%, dan 19%. Kinerja penjatahan pupuk pada dosis 250 kg/ha di lapang oleh unit I, II, III, dan IV rata-rata 10.1, 8.0, 10.3, dan 9.8 g/m dengan keseragaman 17%, 32%, 11%, dan 10%. Uji penjatahan dosis yang terukur yaitu 148, 212, dan 252 kg/ha dari target penjatahan 150, 200, dan 250 kg/ha dengan standar deviasi masing-masing 26, 7, dan 6 kg/ha serta keseragaman 18%. Kedalaman pemupukan rata-rata 61 mm dengan standar deviasi 10 mm dan jarak alur pupuk-benih rata-rata 71 mm dengan standar deviasi 18.7 mm. Kapasitas lapang efektif prototipe yang dibuat 0.13 ha/jam, lebih kecil dibandingkan dengan kapasitas lapang efektif prototipe sebelumnya yaitu 0.3 ha/jam.
Keyword: Dosis pemupukan, kedelai, stepped pitch auger, unit pemupuk

Judul: Gambaran darah komodo (Varanus komodoensis) di Taman Margasatwa Ragunan
Abstrak: This study was conducted to get the hematology and blood biochemistry profile of Komodo dragons at Ragunan Zoo. A total of 18 adult dragons were used. Blood was drawn as much as 2 mL whole blood for hematology and 3 mL for blood biochemistry in serum. Hematology examinations were done by automatic hemavet® machine except differential leukocytes were done manually and blood biochemistry examinations were done by biosystem® machine. Examinations results of erythrocyte parameters of total erythrocytes, hematocrit, hemoglobin, MCV, MCH, and MCHC in row are (1,24±0,21) × 106/mm3, (38,0±4,6) %, (13,3±1,6) g/dL, (311,4±49,9) fL, (109,4±18,7) pg, and (35,1±1,2) g/dL. Trombocytes count is (3,1±1.6) × 103/mm3 and erythrocyte sedimentation rate is (3,9 ± 1.7) mm/h. Leukocytes parameters indicate the values of total leukocytes, heterophils, lymphocytes, monocytes, eosinophils, and basophils in row are (6,53±9,47) × 103/mm3, (3,478±4,972) × 103/mm3, (2,959±4,694) × 103/mm3, (0,096±0,187) × 103/mm3, (0,00) /mm3, and (0,00) /mm3. Biochemical parameters indicate the values of total protein, albumin, globulin, AST, ALT, urea, and creatinine in row are (10,19±3,39) g/dL, (2,51±0,39) g/dL, (7,68±3,07) g/dL, (49,39±20,71) IU/L, (45,39±27,88) IU/L, (13,53±5,88) mg/dL, and (0,29±0,11) mg/dL. The result of examinations averagely showed values tend to normal. Some individual results demonstrated abnormalities which are suspected as acute infection in 1 dragon, foliculogenesis in 1 dragon, muscle disease in 2 dragons, and liver disease in 5 dragons.
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