Judul: Evaluation of Agronomic Performance and Yield  Sorghum Breeding lines IPB in Bogor
Abstrak: Sorgum (Sorghum bicolor (L.) Moench) merupakan salah satu tanaman pangan yang berpotensi dikembangkan sebagai tanaman pangan alternatif di Indonesia. Produktivitas sorgum di Indonesia berkisar 2,13 ton ha-1, sedangkan potensi sorgum adalah 4-5 ton ha-1. Peningkatan produktivitas sorgum masih perlu dikembangkan salah satunya dengan pemuliaan tanaman. Tujuan penelitian ini adalah mengevaluasi keragaan karakter agronomi dan daya hasil pada delapan galur harapan sorgum IPB serta mengidentifikasi galur potensial untuk didaftarkan sebagai varietas unggul baru. Penelitian dilaksanakan pada bulan Februari sampai Juli 2022 di Kebun Percobaan Leuwikopo dan Laboratorium Penelitian Pemuliaan Tanaman, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, IPB. Rancangan percobaan yang digunakan adalah rangkaian kelompok lengkap teracak (RKLT) faktor tunggal genotipe. Hasil analisis ragam sebelas genotipe sorgum menunjukkan bahwa genotipe berpengaruh nyata terhadap semua karakter yang diamati, kecuali pada karakter kadar air bji. Galur uji A-18- 12-7-5, A-19-18-3-8, B-043-16-5-5, C-248-16-5-3-4 dan C-267-18-18-2-7 memiliki keunggulan pada karakter hasil per hektar., Sorghum (Sorghum bicolor (L.) Moench) is a food crops that has developed as an alternatives food crop in Indonesia. Sorghum productivity in Indonesia is 2,13 ton ha-1, while the potential is 4-5 ton ha-1. Increasing the sorghum productivity still needs to be done one of them by plant breeding. The purpose of this research was to evaluate the performent of agronomic and yield on eight promosing lines of sorghum IPB and identify potential lines to be registered as new superior varieties. The research was conducted from February to July 2022 at the Leuwikopo Experimental Field and Plant Breeding Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University. The experimental design used was a randomized complete block design with a single factor is genotype. The result of analysis of varience (ANOVA) of the eleven sorghum genotype showed that the genotype had a significant effect on all observed character, except for the water content character. Lines A-18-12-7-5, A- 19-18-3-8, B-043-16-5-5, C-248-16-5-3-4 and C-267-18-18-2-7 had an advantage on the character of yield per hectare.
Keyword: multilocation, productivity, sorghum, superior varieties

Judul: Agronomic Performance of Nine Sorghum (Sorghum bicolor (L.) Moench) Varieties in Bogor
Abstrak: Sorgum (Sorghum bicolor (L.) Moench) merupakan salah satu tanaman pangan yang berpotensi dikembangkan sebagai tanaman pangan alternatif di Indonesia. Tingginya karbohidrat pada komoditas ini dapat mendukung upaya diversifikasi pangan. Sorgum juga dapat menjadi pakan ternak dan sebagai sumber energi. Tujuan penelitian ini ialah menguji penampilan pertumbuhan, komponen hasil dan hasil sembilan varietas sorgum di Bogor. Penelitian dilaksanakan pada bulan Januari sampai Mei 2024 di Kebun Percobaan Leuwikopo dan Laboratorium Pasca Panen, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, IPB. Rancangan percobaan yang digunakan adalah rangkaian kelompok lengkap teracak (RKLT) faktor tunggal varietas. Hasil analisis ragam sembilan varietas sorgum menunjukkan bahwa varietas berpengaruh nyata terhadap semua karakter yang diamati, kecuali pada karakter bobot malai basah, bobot malai kering, dan bobot 100 butir. Varietas Bioguma 1 memiliki keunggulan pada karakter produktivitas (10 ton ha-1)., Sorghum (Sorghum bicolor (L.) Moench) is one of the food crops potentially to be developed as an alternative food source in Indonesia. The high carbohydrate content of this commodity can support food diversification efforts. It may be used also as feed and energy source source. The objective of this study was to examine the growth performance, yield components and yield nine sorghum varieties in Bogor. The research was conducted at Leuwikopo Experimental Farm and Post-Harvest Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, IPB from January to May 2024. The experimental design used was randomized complete block design with single factor, namely genotypes which consisted of 9 varieties. The results of the analysis of variance of nine sorghum genotypes showed that genotype had a significant effect on all observed characters, except for the characters of fresh panicle weight, dry panicle weight, and 100-grain weight. Bioguma 1 variety achieved the highest grain productivity (10 ton ha-1).
Keyword: produktivitas, varietas unggul, karakter agronomi

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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