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: Evaluation of 100 Lowland Rice Lines (Oryza sativa L.) in F3 Generation of IPB196 population
Abstrak: Lahan pertanian semakin menyempit dan jumlah penduduk semakin bertambah, sehingga perlu pemuliaan tanaman untuk mengatasi hal tersebut. Penelitian ini bertujuan menguji keragaman keragaan 100 galur padi generasi F3 populasi IPB196. Penelitian dilaksanakan di Kebun Percobaan Sawah Baru IPB, Desa Babakan, Dramaga, Bogor pada Februari sampai Agustus 2022. Penelitian ini menggunakan rancangan augmented design dengan menggunakan rancangan lingkungan rancangan kelompok lengkap teracak (RKLT). Digunakan dari 6 pembanding, yaitu dua variets (Ciherang, Inpari32) dan 4 galur padi tipe baru (PTB) ((IPB187-F-37-1-2 (S1), IPB187-F-65-1-2 (S3), IPB193-F-30-2-1 (S9), dan IPB187-F-40-1-1(T5)) dengan 5 ulangan, serta genotipe yang diuji berjumlah 100 galur generasi F3. Karakter panjang batang memiliki kisaran 59,76-88,91 cm dengan kisaran jumlah gabah total per malai 110,35-202,15 g, jumlah anakan antara 4-20 anakan, serta bobot gabah per rumpun berkisar 12,34-62,33 g. Keragaman semua karakter yang diamati termasuk kedalam keragaman sempit dan penampilan yang seragam, ditunjukkan dengan nilai koefisien keragaman genetik (KKG) dan koefisien keragaman fenotip (KKF) yang rendah. Hasil penelitian menunjukkan terdapat sebelas galur menghasilkan bobot gabah per rumpun antara (35,96-62,33 g, lebih tinggi) dari pembanding VUB (23,71 g dan 29,36 g) dan pembanding galur PTB (37,18–38,94 g)., Agricultural land decreases while the population is increasing, so plant breeding is needed to overcome this. This study aims to evaluate the variation performance of 100 F3 lowland rice of the IPB196 population and study their variation, as well as to select the best lines that have high yield potential. The research was carried out at the IPB196. Experimental Farm in Sawah Baru, Babakan Village, Dramaga, Bogor from February to August 2022. This study used an augmented design using a randomized complete group design (RKLT). Six checks are used for two varieties (Ciherang and Inpari32) and four lines of a new rice plant type (NPT) (IPB187-F-37-1-2 (S1), IPB187-F-65-1-2 (S3), and IPB193-F-30-2-1 (S9)), the total number of genotypes evaluated is 100 F3 generations with five replications. The stem length characters ranged from 59.76, to 88.91 cm, with total grain numbers per panicle ranging from 110.35, to 202.15 g, and tillers ranging from 4 to 20. The weight of grain per clump ranges from 12.34 to 62.33 g. The variation of all observed characters belongs to narrow variation and has a uniform appearance, as indicated by low genetic variation coefficient and phenotypic variation coefficient values. The results showed that there were eleven lines that had to produce higher grain weights per clump (from 35.96 to 62.33 g, higher). The VUB check (23.71 g and 29.36 g) and the NPT lines check (37.18 to 38.94 g).
Keyword: line, new plant type of rice, productivity

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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