Judul: Analisis Produktivitas menggunakan Model Simulasi Perkembangan, Pertumbuhan, dan Neraca Air pada Tanaman Tomat (Studi Kasus: Kabupaten Malang, Jawa Timur).
Abstrak: Produktivitas tomat diantaranya dipengaruhi oleh faktor iklim dan dibatasi oleh ketersediaan air. Penelitian ini melakukan simulasi perkembangan, pertumbuhan, dan neraca air tanaman tomat untuk menduga produktivitas, kebutuhan air tanaman , dan menentukan waktu tanam yang baik berdasarkan produktivitas optimumnya di Kabupaten Malang. Produktivitas diduga menggunakan model pertumbuhan serta waktu panen ditentukan oleh konsep Heat Unit. Kebutuhan air tanaman diestimasi menggunakan konsep evapotranspirasi aktual. Estimasi nilai kebutuhan air tanaman tomat sekitar 3.8-14.7 mm/minggu dengan sebesar 46% digunakan untuk fase pembentukan buah sampai panen (6-8 MST). Nilai produktivitas paling tinggi terjadi pada musim hujan atau bulan Januari, september, Oktober, November, Desember dan produktivitas terendah terjadi pada musim kemarau. Analisis perubahan iklim dengan peningkatan suhu 1oC dapat menurunkan produktivitas tomat sebesar 0.2-1.6%.
Keyword: model simulasi, neraca air, produktivitas tomat

Judul: Penggunaan Model Simulasi Pertanian Untuk Menduga Produktivitas Tanaman Tomat (Studi Kasus : Kabupaten Majalengka)
Abstrak: Produktivitas tomat dipengaruhi oleh faktor iklim dan kebutuhan air tanaman. Penelitian ini bertujuan menyusun model simulasi pertanian tanaman tomat yang terdiri dari model simulasi perkembangan, pertumbuhan, dan neraca air untuk menduga produktivitas dan kebutuhan air, serta mengetahui masa tanam tanaman tomat di Kabupaten Tasikmalaya. Perbandingan hasil keluaran model tanaman tomat dengan hasi produktivitas observasi menunjukkan nilai koefisien determinasi (R2 ) sebesar 0,98 di Kabupaten Majalengka dengan nilai galat 6,10 %. Terdapat perbedaan hasil estimasi kebutuhan air tanaman di musim kemarau dan musim hujan yaitu berturut-turut sebesar 1,4 – 6,1 mm/hari dan 1,1 – 5,0 mm/hari. Waktu tanam efektif tanaman tomat dengan menunjukkan nilai rasio produktivitas tertinggi apabila tanaman tomat ditanam pada bulan Januari, Oktober, November dan Desember., Tomato productivity is influenced by climatic factors and plant water requirements. The calculation of tomato productivity value can be estimated using an agricultural simulation model consisting of several sub models including the growth sub model, development sub model, and water balance sub model using climate variables as model inputs. This study aims to develop an agricultural simulation model of tomato plants consisting of development, growth, and water balance simulation models to estimate productivity and water requirements, and determine the planting period of tomato plants. Comparison of the output results of the tomato crop model with the observed productivity results showed a coefficient of determination (R2) of 0.98 in Majalengka Regency with an error value of 6,10%. There are differences in the results of estimating plant water requirements in the dry season and rainy season, which are respectively 1,4 – 6,1 mm / day and 1,1 – 5,0 mm / day. An effective planting time for tomato plants by showing the highest productivity ratio value when tomato plants are planted in January, October, November and December.
Keyword: iklim, Kebutuhan air tanaman, Model simulasi, Produktivitas tomat

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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