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: Performance of Characters from Local Varieties, National Varieties, and Breeding Lines of Sorghum
Abstrak: Sorgum merupakan tanaman serealia dengan daya adaptasi yang luas dan memiliki banyak manfaat. Benih unggul yang masih sulit diperoleh dan terbatas menjadi salah satu masalah dalam pengembangan sorgum di Indonesia. Terdapat beberapa jenis sorgum varietas lokal, varietas nasional, dan galur-galur hasil pemuliaan yang perlu dilakukan uji keragaan karakter agronomi, hasil, dan ketahanan penyakit untuk memperoleh varietas dan galur sorgum yang berpotensi dikembangkan dalam program pemuliaan tanaman dan dilepas sebagai varietas baru. Penelitian dilaksanakan pada bulan Februari-Juli 2021 di Kebun Percobaan Leuwikopo dan Laboratorium Pemuliaan Tanaman, Departemen Agronomi dan Hortikultura, IPB University. Rancangan percobaan yang digunakan adalah rancangan kelompok lengkap teracak satu faktor yaitu genotipe dengan tiga ulangan. Berdasarkan analisis ragam semua genotipe memiliki keragaman karakter agronomi dan hasil yang diamati, juga keragaman karakter pada keparahan penyakit kecuali karat daun saat 60 dan 70 hari setelah tanam (HST), serta busuk batang. Genotipe A-125-1-6-1-6 berpotensi dikembangkan sebagai bahan pangan dan pakan ternak. Genotipe C-375-17-1-5 berpotensi dikembangkan sebagai bahan pangan dengan tinggi tanaman sedang. Genotipe Pulut 5 berpotensi dijadikan tetua untuk menghasilkan sorgum berumur genjah. Genotipe dari galur hasil pemuliaan menunjukkan respon sangat tahan terhadap penyakit antraknosa dan karat daun, kecuali Soraya 3. Varietas lokal memiliki respon ketahanan penyakit tahan dan agak tahan., Sorghum is categorized as a cereal crop with a wide range of adaptability and numerous advantages. Superior seeds are still difficult to obtain and limited supplay is one of the challenges in Indonesia sorghum development. There are several types of sorghum local varieties, national varieties, and breeding lines that need to be tested for the performance of agronomic characters, yield, and disease resistance in order to obtain sorghum varieties and lines with the potential to be developed in plant breeding programs and released as new varieties. The experiment was conducted from February-July 2021 at Leuwikopo Experimental Field and Plant Breeding Laboratory, Department of Agronomy and Horticulture, IPB University. The experimental design used was a randomized complete block design with one genotype treatment factor, in three replications. The result of the analysis of variance, showed that all genotypes had variability in agronomic characters and yield, as well as variability in disease severity, with the exception of leaf rust at 60 and 70 days after planting (DAP), and stem rot. Genotype A-125-1-6-1-6 has the potential to be developed as food and animal feed ingredient. Genotype C-375-17-1-5 has the potential to be developed as food plant with a medium plant height. The pulut 5 genotype has the potential to be used as parents in the production of early-aged sorghum. The breeding lines showed a very resistant response to anthracnose and leaf rust, except for the Soraya 3. Disease resistance reponses in local varieties are resistant and moderately resistant.
Keyword: analisis ragam, genotipe, karakter, keragaman, ketahanan penyakit

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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