Judul: Performance of IPB New Plant Type of Rice Promising Lines in Kabupaten Lebak for Multilocation Test
Abstrak: Permintaan akan padi terus meningkat seiring dengan meningkatnya jumlah penduduk di Indonesia. Salah satu cara untuk mengatasinya adalah dengan menciptakan varietas yang mempunyai produktivitas yang tinggi, oleh karena itu pemuliaan padi harus selalu dilakukan. Departemen Agronomi dan Hortikultura IPB telah melakukan penelitian padi dan sudah menghasilkan galur-galur yang berpotensi untuk dilepas menjadi varietas unggul baru. Penelitian ini dilakukan untuk menguji daya hasil galur harapan padi tipe baru (PTB) yang berpotensi untuk dilepas menjadi varietas unggul baru (VUB) dalam rangka uji multi lokasi (UML) sebagai bagian dari kelengkapan persyaratan data untuk pengusulan pelepasan varietas. Penelitian ini dilaksanakan di Desa Bojongleles, Kecamatan Cibadak, Kabupaten Lebak, Banten. Penelitian ini dilaksanakan dengan menggunakan Rancangan Kelompok Lengkap Teracak (RKLT). Perlakuan yang digunakan yaitu genotipe sebagai faktor tunggal. Perlakuan terdiri dari 8 genotipe galur harapan PTB IPB yaitu IPB102-F-46-2-1, IPB107-F-16E-3-1, IPB107-F-25-1-1, IPB107-F-36-1-1, IPB107-F-48-1-1, IPB116-F-42-2-1, IPB116-F-45-2-1, dan IPB117-F14-2-1 dengan dua genotipe pembanding yaitu varietas Ciherang dan IR64, masing-masing genotipe diulang sebanyak tiga kali sehingga terdapat 30 satuan percobaan. Setiap satuan percobaan ditanam dalam satu petak berukuran 4 x 5 m dengan menggunakan jarak tanam 20 x 20 cm. Hasil penelitian ini menunjukan bahwa galur-galur harapan PTB IPB yang diuji memiliki potensi hasil yang setara dengan kedua varietas pembanding. Galur IPB107-F-16E-3-1 dan IPB116-F-45-2-1 memiliki rata-rata hasil berturut-turut 7.40 ton/ha dan 6.4 ton/hasedangkan varietas pembanding Ciherang dan IR64 yang mempunyai rata-rata hasil berturut-turut 6.12 dan 5.98 ton/ha. Galur yang mempunyai ciri yang mendekati ciri-ciri PTB adalah galur IPB116-F-45-2-1, ii galur ini memiliki jumlah anakan, anakan produktif, tinggi tanaman, dan umur tanaman yang mendekati cirri-ciri PTB, selain itu galur ini memiliki umur panen yang lebih genjah dibandingkan dengan kedua varietas pembanding yaitu 105 hari setelah tebar umur panen ini 11 hari sebelum varietas pembanding Ciherang dan 7 hari sebelum varietas pembanding IR64.
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Judul: Keragaan 10 Galur Harapan Padi Sawah Tipe Baru (PTB) di Kabupaten Lebak, Banten
Abstrak: Rice is the main food commodities. The demand of rice increasing in line with growth of the population in Indonesia. Meanwhile, potential yield of new superior varieties (VUB) which has grown farmers have reached the optimum. Required assembling new varieties that have high yield potential and have a wide adaptability. The objective of this research were to evaluate potential yield of IPB New Plant Type of Rice (NPT) potential for hight yielding varieties in multilocation test and as part of the completeness data requirements for proposing varietie release. Research was done in Bojong Leles, Lebak, Banten from May until September 2011. The research was done using Randomized Complete Design Group (RKLT) by a single factor of genotypes or lines. Genotypes used were 10 IPB new plant type of rice promising lines there are IPB107-F-5-1-1, IPB107-F-65-3-1, IPB113-F-2-1-1, IPB115-F-3-2-1, IPB116-F-3-1-1, IPB116-F-44-1-1, IPB116-F-46-1-1, IPB117-F-1-3-1, IPB117-F-4-1-1, and IPB149-F-8-1-1 with 2 comparison variety, there are Ciherang and IR64. The research was repeated three replicates so that there are 36 units of the research. Each unit of the research were planted in a plot measuring 4 m x 5 m. Spacing used in these researchs was 2:1 legowo spacing (10 cm x 20 cm x 40 cm). The study further analyzed the F test on a real level 5%, if significantly different be followed by Dunnet t-test at 5% level. The results showed that lines tested showed an average yield lower up to the equivalent comparison varieties. Line IPB115-F-3-2-1 (6.38 tonnes / ha) is a line with the results closest comparison varieties. Some lines show a character who approached the character of NPT with important characteristics, low tillering capacity (8-13 tillers productive), large panicle and thick, number of grain filling a lot (200-250 grains/panicle), short growth duration (100-120 days), and 1000 grain weight of 26-29 g. Lines included are IPB107-F-5-1-1, IPB107-F-65-3-1, IPB116-F-44-1-1, dan IPB116-F-46-1-1. In general, some of the lines tested showed superiority on some characters, such as short growth duration, large panicle, and number of grain a lot. Research shows the percentage of grain is still high vacuum.
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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