Judul: Evaluation of 18 Improved Upland Rice Lines (Oryza sativa L.) of F9 Generation in Bogor Regency
Abstrak: Varietas unggul padi yang adaptif terhadap lahan kering merupakan salah satu teknologi dalam usaha meningkatkan produksi padi nasional. Kegiatan penelitian bertujuan untuk mengevaluasi keragaan produksi dan karakter agronomi lainnya dari galur yang diteliti sehingga memperoleh galur harapan padi gogo IPB generasi F9 yang memiliki potensi hasil tinggi dan karakter agronomi yang baik. Penelitian ini dilaksanakan di Kebun Percobaan IPB, Desa Babakan, Kecamatan Dramaga, Kabupaten Bogor, Jawa Barat. Penelitian dilaksanakan pada bulan November 2019 hingga bulan Maret 2020. Percobaan dilakukan dengan rancangan kelompok lengkap teracak (RKLT) faktor tunggal dengan tiga ulangan. Materi genetik yang dievaluasi terdiri dari 18 galur IPB dan 2 varietas pembanding yaitu varietas INPAGO 10 dan INPAGO 12. Hasil penelitian menunjukan bahwa galur yang diuji memiliki produktivitas yang setara dengan kedua varietas pembanding dan umur yang genjah. Galur IPB187-F-43-1-1, IPB187-F-66-2-2, IPB194-F-40-2-1, IPB194-F-78-2-2, dan IPB194-F-39-1-2 memiliki karakter agronomi yang lebih baik dari pada varietas pembanding. Karakter agronomi yang dimaksud antara lain bobot 1000 butir, panjang malai, umur panen, dan jumlah anakan. Galur IPB189-F-23-2-3 memiliki hasil gabah kering giling cukup tinggi yaitu 5,57 ton ha-1, sementara varietas INPAGO 10 berproduksi 4,27 ton ha-1 dan INPAGO 12 berproduksi 4,85 ton ha-1., Improved rice variety adaptive to dryland is one of the technologies suitable for increasing the national rice production. This study aimed to evaluate the yield and other agronomic characters of several IPB upland rice inbred lines and identify lines with good agronomic traits. This research was conducted at the Babakan Experimental Station of the IPB University, Dramaga District, Bogor Regency, West Java, from November 2019 to March 2020. The experiment used a single-factor randomized complete group design (RCBD) with three replications. The genetic materials evaluated consisted of 18 IPB rice lines and two check varieties, namely INPAGO 10 and INPAGO 12. The results showed that the IPB lines evaluated had equivalent productivity with the two check varieties and early maturity. The IPB187-F-43-1-1, IPB187-F-66-2-2, IPB194-F-40-2-1, IPB194-F-78-2-2, and IPB194-F-39-1-2 lines had better agronomic traits than the check varieties. These agronomic traits were grain size, panicle length, maturity, and number of tillers. IPB189-F-23-2-3 lines has a fairly high dry milled grain yield of 5,57 tons ha-1, while the INPAGO 10 variety is producing 4,27 tons ha-1 and INPAGO 12 is producing 4,85 tons ha-1.
Keyword: daya hasil, galur padi IPB, padi gogo, IPB University rice lines, upland rice, yield trial

Judul: Preliminary Yield Trial of 84 Lowland Rice Lines (Oryza sativa L.) of F5 and F6 Generation.
Abstrak: Beras merupakan sumber karbohidrat utama masyarakat Indonesia. Peningkatan potensi produktivitas padi untuk mencukupi kebutuhan masyarakat terus dilakukan melalui perbaikan mutu dengan kegiatan pemuliaan tanaman dimana salah satu tahapannya yaitu uji daya hasil pendahuluan. Penelitian ini bertujuan menguji daya hasil dan keragaan galur harapan padi generasi F5 dan F6 untuk memperoleh galur yang memiliki daya hasil dan karakter agronomi lebih baik sebagai galur yang akan diuji pada tahapan berikutnya. Penelitian dilaksanakan pada bulan Februari hingga Juli 2023 di Kebun Percobaan Sawah Baru, Kecamatan Dramaga, Bogor dan Laboratorium Pemuliaan Tanaman. Percobaan menggunakan Rancangan Kelompok Lengkap Teracak faktor tunggal dengan 84 galur dan 2 varietas pembanding sebagai perlakuan. Hanya galur IPB200-F-42 dengan daya hasil nyata lebih tinggi daripada Inpari 32 (4,58 ton ha-1) dengan produktivitas sebesar 7,16 ton ha-1, namun tidak berbeda nyata dengan Ciherang (5,21 ton ha-1) berdasarkan analisis statistik. Meskipun demikian, terdapat galur yang cenderung memiliki produktivitas lebih tinggi daripada varietas pembanding berdasarkan nilai rataan serta memiliki karakter agronomi sesuai dengan kriteria PTB. Galur-galur tersebut yaitu IPB200-F-2, IPB200-F-14, IPB200-F-15, IPB200-F-17, IPB204-E-6, IPB200-F-21, IPB200-F-22, IPB200-F-25, IPB204-E-10, IPB201-F-16, IPB200-F-43, IPB200-F-44, IPB187-F-40-1-1., Rice is the main source of carbohydrates for Indonesian people. Increasing the potential for rice productivity to meet community needs continues to be carried out through quality improvement through plant breeding activities, where one of the stages is preliminary yield testing. This study aims to test the yield and performance of the expected lines of F5 and F6 generations of rice in order to obtain lines that have better yield and agronomic characteristics as lines to be tested in the next stage. The research was conducted from February to July 2023 at the Sawah Baru Experimental Garden, Dramaga District, Bogor, and the Plant Breeding Laboratory. The experiment used a single factor randomized block design with 84 lines and two control varieties as treatments. IPB200-F-42 is the only one line which had significantly higher yields than Inpari 32 (4.58 tons ha-1) with a productivity of 7.16 tons ha-1, but was not significantly different from Ciherang (5.21 tons ha-1) based on statistical analysis. Nonetheless, there are lines that tend to have higher productivity than the control varieties based on the average value and have agronomical characteristics according to the PTB criteria. These lines are IPB200-F-2, IPB200-F-14, IPB200-F-15, IPB200-F-17, IPB204-E-6, IPB200-F-21, IPB200-F-22, IPB200-F-25, IPB204-E-10, IPB201-F-16, IPB200-F-43, IPB200-F-44, IPB187-F-40-1-1.
Keyword: genotype, new plant type of rice, productivity, selection

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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