Judul: Yield Potential of 18 Groundnut (Arachis hypogaea
L.) Lines from Selection of Transgressive Segregants
Abstrak: Perakitan varietas unggul diperlukan sebagai upaya meningkatkan produksi nasional kacang tanah. Tahapan penting dalam perakitan varietas baru adalah pengujian daya hasil galur terseleksi. Penelitian ini bertujuan menguji daya hasil 18 galur kacang tanah (Arachis hypogaea L.) hasil seleksi segregan transgresif untuk memperoleh galur-galur yang memiliki potensi produksi tinggi. Penelitian dilaksanakan di Kebun Percobaan Cikabayan Bawah, Departemen Agronomi dan Hortikultura, Institut Pertanian Bogor pada bulan Februari hingga Juni 2020. Rancangan lingkungan yang digunakan berupa Rancangan Kelompok Lengkap Teracak (RKLT) faktor tunggal terdiri atas 18 galur uji dan 3 varietas pembanding. Hasil uji F menunjukan bahwa respon semua karakter berbeda nyata terhadap perlakuan kecuali pada karakter bobot polong per m2. Analisis korelasi menunjukan nilai koefisien korelasi positif yang tinggi antara karakter daya hasil bobot biji per tanaman dengan jumlah polong total, jumlah polong isi, bobot polong total, dan bobot polong isi. Karakter-karakter tersebut dapat dipertimbangkan untuk dijadikan karakter seleksi dalam perakitan varietas unggul. Berdasarkan karakter daya hasil bobot biji didapatkan galur-galur terpilih yang memiliki daya hasil paling tinggi yaitu G21, G41, G53, G76, G84, G99, G100, G144, G199, dan G209.
Keyword: agronomy characters, correlation coefficient, GCV, heritability, variance

Judul: Yield Potential of 18 Peanut (Arachis hypogaea L.) IPB  Breeding Lines in Bandung
Abstrak: Uji daya hasil galur-galur hasil seleksi termasuk salah satu tahapan dalam perakitan varietas unggul, sebagai upaya meningkatkan produksi nasional kacang tanah. Penelitian ini bertujuan menguji daya hasil 18 galur kacang tanah (Arachis hypogaea L.) rakitan IPB untuk mendapatkan galur berpotensi daya hasil tinggi. Penelitian dilaksanakan pada bulan Januari hingga Juni 2021 di Kecamatan Kutawaringin Kabupaten Bandung dengan ketinggian 760 m dpl. Penelitian ini menggunakan Rancangan Kelompok Lengkap Teracak faktor tunggal dengan 18 galur uji dan 3 varietas pembanding. Berdasarkan hasil penelitian, daya hasil galur G33, G133, dan G205 nyata lebih tinggi dari varietas pembanding kecuali pada karakter tinggi tanaman, bobot tajuk basah, indeks masak biji kulit, dan bobot polong per m². Hasil analisis korelasi menunjukkan bahwa karakter jumlah polong total, jumlah polong isi, bobot polong total, bobot polong isi, dan bobot polong per m² mempunyai koefisien korelasi kuat dan sangat nyata dengan bobot biji per tanaman. Karakter tersebut dapat dipertimbangkan untuk dijadikan kriteria seleksi dalam perakitan varietas unggul. Berdasarkan karakter bobot polong total didapatkan galur-galur terpilih yang memiliki daya hasil tertinggi yaitu G21, G33, G41, G76, G99, G133, G199, G205, G209, dan G237., The yield test of selected lines is one of the stages in assembling superior varieties, as an effort to increase peanut production. This study aimed to evaluate the yield of 18 genotypes of peanut (Arachis hypogaea L.) IPB breeding lines to obtain high yielding potential lines. The research was carried out from January to June 2021 in Kutawaringin District, Bandung Regency at an altitude of 760 m above sea level. This study used a single factor in complete randomized completely-block design with 18 test lines and 3 comparison varieties. Based on the results of the study, the yield of G33, G133, and G205 were significantly higher than the control varieties except for the characters of plant height, wet crown weight, seed shell ripening index, and pod per m². The results of the analysis showed that the character of the number of pods, the number of filled pods, the weight of the pods, the weight of the filled pods, and the weight of the pods per m² had a strong and very significant correlation coefficient with seed weight per plant. These characters can be considered for selection in the assembly of superior varieties. Based on the total pod weight character, the selected lines that have higher yield are G21, G33, G41, G76, G99, G133, G199, G205, G209, and G237.
Keyword: agronomy character, correlation, superior variety, yield

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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