Judul: Evaluation of Pod Dehiscent Resistance and  Productivity Levels of 22 Genotypes Green Beans (Vigna radiata L.) Selection  Results of IPB
Abstrak: Kacang hijau (Vigna radiata L. Wilczek) pada umumnya memiliki genotipe yang rentan mengalami pecah polong sehingga banyak terjadi kehilangan hasil sebelum panen dan saat panen. Penelitian ini bertujuan untuk mengevaluasi ketahanan pecah polong dan beberapa karakter agronomi galur-galur kacang hijau IPB. Penelitian dilaksanakan di kebun Percobaan Balai Penelitian Bioteknologi dan Sumberdaya Genetik Pertanian, Kecamatan Bogor Barat, Kota Bogor dari bulan November 2022 hingga bulan Maret 2023. Penelitian ini menggunakan rancangan kelompok lengkap teracak dengan tiga ulangan. Sebanyak 22 genotipe kacang hijau dan 2 varietas pembanding yaitu Vima 1 dan Vima 5 ditanam hingga sampai masa panen dan dilakukan pengamatan karakter agronomi serta persentase pecah polong. Hasil penelitian ini menunjukkan beberapa genotipe yang diuji memiliki karakter agronomi yang lebih baik dari pembanding. Genotipe F7- Lom2/129-42, F7- VR10/V1-29, F7-VR10/V1-10, F7-Lom2/129-2, dan F5-Lom2/129-125 memiliki karakter yang paling baik dari galur yang diuji dan lebih baik dari varietas pembanding. Galur-galur kacang hijau yang diuji bersifat toleran pecah polong., Mung bean (Vigna radiata L. Wilczek) has most of the genotypes that are prone to pod dehiscent resulting in a lot of yield loss before and during harvest. This study aims to evaluate the resistance to pod dehiscent and several agronomic characters of IPB's green bean lines. The research was conducted at the Experimental Garden of the Balai Penelitian Bioteknologi dan Sumberdaya Genetik Pertanian, West Bogor District, Bogor City from November 2022 to March 2023. This study used randomized complete group design with three replications. A total of 22 mung bean genotypes and 2 control varieties, namely Vima 1 and Vima 5, were planted up to harvest and observed for agronomic characters and the percentage of pod dehiscent. The results of this study indicated that some of the genotypes tested had better agronomic characteristics than the controls The genotypes F7-Lom2/129-42, F7-VR10/V1-29, F7-VR10/V1-10, F7-Lom2/129-2, and F5-Lom2/129-125 had the best characters from the strains tested and better than the comparison varieties. The strains of green beans tested were tolerant dehiscent of the pods.
Keyword: pod dehiscent, agronomic characters, mung bean

Judul: Evaluation of Agronomic Character and Harvesting  Period of F5 Line of Mung Bean (Vigna radiata L.  Wilczek)
Abstrak: Kacang hijau sebagai tanaman pangan legume ketiga terpenting di Indonesia memiliki produktivitas yang masih tergolong rendah. Penelitian ini bertujuan mengevaluasi beberapa galur kacang hijau IPB untuk karakter agronomi, periode panen, dan potensi produksinya. Penelitian ini dilaksanakan di Kebun Percobaan Leuwikopo pada bulan Maret sampai Mei 2022. Rancangan penelitian ini adalah rancangan kelompok lengkap teracak dengan tiga ulangan menggunakan 20 genotipe F5 dan 5 genotipe pembanding. Hasil penelitian menunjukkan bahwa genotipe berpengaruh sangat nyata terhadap umur berbunga, umur matang polong pertama, umur panen pertama, umur panen terakhir, periode panen, tinggi tanaman, panjang rangkaian bunga, jumlah cabang produktif, jumlah polong, panjang polong, dan bobot biji/tanaman, yang mengindikasikan adanya keragaman. Semua karakter memiliki nilai heritabilitas tergolong tinggi, kecuali panjang rangkaian bunga, jumlah cabang produktif, bobot polong, dan bobot biji per tanaman tergolong sedang. Dendrogram yang dihasilkan memperlihatkan adanya 12 kelompok utama pada tingkat kemiripan 66,67 %. Genotipe F5 VR10/V1-10, Lom2/129-43, Lom2/129-37, dan Lom2/129-2 terpilih sebagai kandidat galur berdasarkan karakter periode panen pendek (18-28 hari) dan hasil tinggi (11,3-15,4 g)., Mung bean, the third most important legume food crop in Indonesia, has low productivity. This study aims to evaluate several IPB mung bean lines for their agronomic characters, harvest period, and yield potential. This research was carried out at the Leuwikopo Experimental Field in March-May 2022. The research design was an randomized complete block design with three replications using 20 genotypes F5 and 5 control genotypes. The results showed that genotype had a very significant effect on flowering age, first mature pod emergence, first harvest age, last harvest age, harvest period, plant height, inflorescence length, number of productive branches, number of pods, pod length, and seed weight per plant. All characters had high heritability values, except for inflorescence length, number of productive branches, pod weight, and seed weight per plant which were classified as moderate. The resulting dendrogram showed 12 main groups at a similarity level of 66,67 %. Genotypes VR10/V1-10, Lom2/129-43, Lom2/129-37, and Lom2/129-2 were selected as candidate lines based on their short harvest period (18-28 days) and high yield (11,3-15,4 g).
Keyword: dendrogram, genotipe, heritabilitas, periode panen, seleksi

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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