Judul: Keragaan Galur-galur Gandum (Triticum aestivum L.) di Dataran Rendah.
Abstrak: Gandum merupakan salah satu tanaman pangan serealia yang paling banyak diproduksi selain jagung dan padi. Gandum merupakan salah satu komoditas tanaman pangan sebagai sumber karbohidrat dan protein. Kebutuhan dan konsumsi gandum dalam negeri semakin meningkat setiap tahunnya. Budidaya gandum terbatas pada dataran tinggi akibat kondisi agroklimat yang tidak sesuai pada dataran rendah. Hal inilah yang menjadi alasan pemuliaan untuk mengembangkan varietas gandum yang beradaptasi dengan daerah dataran rendah. Penelitian ini bertujuan untuk memperoleh informasi keragaan dan daya hasil galur-galur gandum di dataran rendah. Penelitian dilaksanakan dari bulan Desember 2022 sampai Maret 2023 di Kebun Pusat Kajian Hortikultura Tropika Tajur 2. Pengamatan komponen hasil dilakukan di Laboratorium Pemuliaan Tanaman 2, Departemen Agronomi dan Hortikultura, IPB. Penelitian terdiri dari satu faktor yaitu genotipe (26 genotipe dan 4 varietas pembanding). Penanaman menggunakan rancangan kelompok lengkap teracak dengan tiga ulangan. Hasil penelitian menunjukkan adanya perbedaan yang nyata antara genotipe yang diuji. Genotipe CBF-7.CAMN171 memiliki umur berbunga dan umur panen yang lebih genjah, dan luas daun bendera yang lebih tinggi dari keempat varietas pembanding berdasarkan uji Beda Nyata Jujur (BNJ). Semua galur gandum memiliki jumlah biji bernas dan jumlah biji ubinan yang tidak berbeda nyata terhadap keempat varietas pembanding., Wheat is one of the most widely produced cereal food crops besides corn and rice. Wheat is one of the food crop commodities as a source of carbohydrates and protein. Domestic demand for and consumption of wheat is increasing every year. Wheat cultivation is limited to the highlands due to unsuitable agro-climatic conditions in the lowlands. This is the reason for breeding to develop wheat varieties adapted to lowland areas. This study aims to obtain information on the performance and yield of wheat lines in the lowlands. The research was conducted from December 2022 to March 2023 at the Center for Tropical Horticultural Studies Experimental Field 2, Tajur-Bogor. Observations of yield components were carried out at the Plant Breeding Laboratory 2, Department of Agronomy and Horticulture, IPB. The study consisted of one factor, namely genotype (26 genotypes and 4 control varieties). Planting using a randomized complete block design with three replications. The results showed that there were significant differences between the genotypes tested. The genotype CBF-7.CAMN171 had a earlier flowering and harvesting age, and higher flag leaf area than the four control varieties based on the Honestly Significance Diffirence (HSD) test. All wheat lines had the number of filled seeds and seed number per square meter which were not significantly different compare to the four control varieties.
Keyword: yield, grain, genotype, productivity, varieties

Judul: Keragaan Galur-Galur Gandum (Triticum aestivum) Generasi F7 di Lingkungan Optimum di Wilayah Tropis
Abstrak: Penelitian bertujuan untuk mempelajari keragaan tanaman gandum di lingkungan optimum tropika basah. Penelitian dilakukan pada bulan Maret hingga Juli 2015 di Kebun Percobaan Balai Penelitian Tanaman Hias (Balithi), Cipanas, Jawa Barat dengan ketinggian 1 130 meter di atas permukaan laut (m dpl). Rancangan percobaan yang digunakan adalah Rancangan Kelompok Lengkap Teracak (RKLT) dengan galur sebagai perlakuan, 3 ulangan. Bahan percobaan yang digunakan adalah 37 galur tanaman gandum generasi F7 dan 6 varietas pembanding yang terdiri atas 2 tetua (Oasis dan HP1744) dan 4 varietas unggul nasional (Guri 1, Guri 2, Selayar, Dewata). Hasil penelitian didapatkan bahwa genotipe berpengaruh sangat nyata terhadap karakter tinggi tanaman, jumlah anakan produktif, umur berbunga, umur panen, panjang malai utama dan jumlah spikelet per malai utama. Genotipe tidak berpengaruh nyata terhadap beberapa karakter hasil, yaitu jumlah floret per malai utama, bobot biji per malai utama dan bobot biji per tanaman.
Keyword: dataran tinggi, persilangan, shuttle breeding

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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