Judul: Evaluasi Keragaan Galur-Galur Jagung Pulut Koleksi IPB
Abstrak: Pemuliaan jagung pulut memerlukan informasi keragaan karakter galur yang digunakan untuk dijadikan sebagai tetua dalam perakitan varietas hibrida. Penelitian bertujuan mengevaluasi keragaaan galur-galur jagung pulut koleksi IPB dan mengidentifikasi galur yang potensial untuk dijadikan sebagai tetua dalam perakitan varietas hibrida. Penelitian dilaksanakan pada bulan November 2022- Februari 2023 di Kebun Percobaan PKHT Pasir Kuda dan Laboratorium Pendidikan Pemuliaan AGH. Penelitian terdiri atas 1 faktor, yaitu 15 genotipe galur jagung pulut koleksi IPB. Percobaan menggunakan rancangan kelompok lengkap teracak (RKLT) dengan tiga ulangan. Terdapat perbedaan karakter kuantitatif dan kualitatif dari galur-galur yang diamati. Hasil penelitian menunjukkan bahwa genotipe berpengaruh nyata terhadap semua karakter kuantitatif kecuali panjang daun. Terdapat keragaman karakter kualitatif pada galur-galur yang diamati kecuali karakter bentuk ujung daun. Produktivitas galur-galur jagung pulut pada penelitian berkisar 2,06-4,44 ton.ha-1 . Genotipe JPM1.5.19 memiliki produktivitas tertinggi dari semua galur jagung pulut yang diuji. Genotipe JPM1.5.19, JPS13.6.1P.10, dan JPS13.16.12.7 merupakan galur yang potensial untuk dijadikan sebagai tetua dalam perakitan jagung pulut hibrida., Waxy corn plant breeding requires information about the line characteristics used as parents in hybrid crosses. This study aimed to assess the performance of various lines of waxy corn from the IPB collection and identify which potential lines to serve as parents in hybrid crosses. The research was conducted from November 2022-February 2023 at the PKHT experimental field Pasir Kuda and the AGH Breeding Education Laboratory. The study consisted of single factor, i.e. 15 genotypes of waxy corn breeding lines of IPB collection. The experiment used a completely randomized block design (RCBD) with three replications. The results showed that there are differences in the quantitative and qualitative characteristics of the lines observed. Genotype significantly affected all quantitative characters except leaf length. There was a variety of qualitative characters in the observed lines except for the shape of the leaf tips. The productivity of various lines in this study ranged from 2.06-4.44 ton.ha-1 . Genotype JPM1.5.19 had the highest productivity of all evaluated waxy corn lines. Genotypes JPM1.5.19, JPS13.6.1P.10, and JPS13.16.12.7 are potential lines to be used as parents in hybrid waxy corn crossing.
Keyword: galur potensial, genotipe, karakter, pemuliaan tanaman, produktivitas

Judul: Performance Various Breeding Line of Sweet Corn (Zea mays saccharata Sturt) IPB Collection
Abstrak: Varietas hibrida yang berasal dari hasil persilangan dua galur atau lebih merupakan salah satu upaya peningkatan produksi jagung manis. Oleh karena itu, informasi tentang keragaan dari suatu galur jagung manis penting dalam perakitan varietas hibrida jagung manis. Penelitian ini bertujuan untuk mengevaluasi keragaan berbagai galur jagung manis koleksi IPB. Penelitian ini dilaksanakan dari bulan November 2022 hingga Februari 2023 di Kebun Percobaan IPB Leuwikopo, Dramaga, Bogor, Jawa Barat. Penelitian terdiri dari satu faktor yaitu 15 galur jagung manis. Penanaman dilakukan menggunakan rancangan kelompok lengkap teracak dengan 3 ulangan sehingga terdapat 45 satuan percobaan. Hasil penelitian menunjukkan terdapat perbedaan keragaan antar galur jagung manis. Genotipe berpengaruh sangat nyata terhadap semua karakter kecuali diameter batang dan anthesis silking interval (ASI). Genotipe T13.1.8.16, SB8.4.3, SM1.1.9, SM12.2.13, dan SB5.1B.3B.1 potensial digunakan sebagai tetua hibrida karena memiliki beberapa keunggulan pada karakter yang diamati seperti produktivitas, padatan terlarut total, serta anthesis silking interval (ASI). Genotipe SM1.1.9 dan T13.1.8.16 menghasilkan produktivitas tertinggi yaitu 16,41 ton ha-1 dan 14,97 ton ha-1. Genotipe SB8.4.3 menghasilkan padatan terlarut total (PTT) tertinggi sebesar 16,50 obrix. Anthesis silking interval (ASI) tertinggi terdapat pada oleh genotipe SM1.1.9. Genotipe SM12.2.13 dan SB5.1B.3B.1 menghasilkan panjang tongkol, jumlah bij per baris, dan ukuran biji tertinggi., Hybrid varieties derived from the crossing of two or more strains are one of the efforts to increase sweet corn production. Therefore, information on the performance of a sweet corn breeding line is important in the assembly of sweet corn hybrid varieties. This study aimed to evaluate the performance of various sweet corn breeding line from the IPB collection. The research was conducted from November 2022 to February 2023 at IPB Leuwikopo Experimental Farm, Dramaga, Bogor, West Java. The study consisted of one factor, 15 sweet corn breeding line. Planting was done using a RKLT design with 3 replications so that there were 45 experimental units. The results showed that there were differences in performance between sweet corn breeding line. Genotype had a very significant effect on all characters except stem diameter and anthesis silking interval (ASI). Genotypes T13.1.8.16, SB8.4.3, SM1.1.9, SM12.2.13 and SB5.1B.3B.1 have the potential to be used as hybrid parent because they have several advantages in the observed characters such as productivity, total soluble solids, and anthesis silking interval (ASI). Genotypes SM1.1.9 and T13.1.8.16 produced the highest productivity of 16.41 ton ha-1 and 14.97 ton ha-1. Genotype SB8.4.3 produced the highest total soluble solids (TSS) at 16.50 obrix. Anthesis silking interval (ASI) was highest in genotype SM1.1.9. Genotypes SM12.2.13 and SB5.1B.3B.1 produced the highest cob length, number of seeds per row, and seed size.
Keyword: Character, Cob Storability, Evaluation, Genotype

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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