Judul: Analisis preferensi risiko dan efisiensi teknis usahatani talas di Kota Bogor
Abstrak: Risk preferences play an important role in farmer’s decisions on input allocation and hence in output supply. Talas productivity in Bogor City was low that it was influenced by risk preferences of farmer. The objectives of this study were to analyze: (1) technical efficiency of talas farming in Bogor City, (2) talas farming technical inefficiency sources in Bogor City, (3) risk preferences of farmer in the face of talas farming production risk in Bogor City, and (4) the effect of risk preferences of farmer to talas farming technical efficiency in Bogor City. Frontier production function model with heteroskedastic error structure estimated by Maximum Likelihood estimation developed by Kumbhakar was adopted to analyze risk preferences of farmer and technical efficiency of talas farming in Bogor City. Sixty five samples were drawn by simple random sampling method. The results show talas farming are technically efficient, and farmer socio-economic characteristics such as land holding and age influence talas farming technical inefficiency sources in Bogor City. All farmers are risk taker that influences input allocation and technical efficiency. Result shows risk taker farmers used input higher that yield high technical efficiency and high productivity.
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Judul: Analisis usahatani talas di Desa Taman Sari Kecamatan Taman Sari Kabupaten Bogor
Abstrak: Talas merupakan salah satu komoditas yang mempunyai prospek pengembangan yang cukup cerah dan menguntungkan. Dewasa ini usaha pengembangan pengolahan talas semakin berkembang. Dengan semakin meningkatnya jumlah penduduk Indonesia seharusnya menyebabkan permintaan komoditas lalas semakin meningkat. Hal ini merupakan sebuah peluang yang baik untuk para petani talas, akan tetapi pada kenyataannya tingkat produksi talas di Bogor sebagai wujud dari upaya pemenuhan peningkatan permintaan tersebut masih berfluktuatif. Hal ini dikarenakan usaha peningkatan produksi talas dipengaruhi oleh faktor-faktor produksi yang digunakan dalam usahatani talas. Oleh karena itu, perlu dilakukan analisis usahatani talas di Kecamatan Taman Sari. Penelitian ini dilakukan di Desa Taman Sari, Kecamatan Taman San, Kabupaten Bogor, pada bulan Mei hingga bulan Juni 2007. Jenis data yang digunakan dalam penelitian ini terdiri dari data primer dan data sekunder. Penelitian ini menggunakan metode Stratified Random Sampling. Jumlah responden usahatani talas sebanyak 30 orang, dan dikelompokkan berdasarkan luas lahan garapan, yaitu petani lahan sempit (< 0,49 hektar) dan lahan luas ( 0,5 hektar). Pengolahan dan analisis data dilakukan secara kualitatif dan kuantitatif. Analisis kualitatif dilakukan untuk mengetahui gambaran tentang usahatani talas di Desa Taman Sari Kecamatan Taman Sari. Analisis kuantitatif dilakukan dengan menggunakan analisis pendapatan, analisis R/C rasio dan analisis penggunaan faktor produksi.
Keyword: Talas, Botani tanaman talas, Usahatani talas

Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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