Judul: Evaluation of Agronomic Character and Synchronous Maturity of F4 Mung Beans (Vigna radiata L. Wilczek)
Abstrak: Kacang hijau merupakan tanaman pangan legum penting ketiga setelah kedelai dan kacang tanah, namun angka produksinya dalam lima tahun terakhir mengalami penurunan walaupun permintaannya tetap tinggi. Peningkatan produktivitas kacang hijau dapat dilakukan dengan merakit varietas yang berumur genjah, periode panen pendek, dan daya hasil tinggi. Penelitian ini bertujuan mengevaluasi keragaan karakter agronomi dan keserempakan panen kacang hijau VR480B × Vima 1 generasi F4 untuk memperoleh keunggulan periode panen pendek dan daya hasil tinggi. Penelitian dilaksanakan di Desa Bengkaung, Kabupaten Lombok Barat pada bulan Maret hingga Juni 2021. Materi genetik yang digunakan 418 benih populasi F4 hasil seleksi menggunakan metode single seed descent serta tetua VR480B dan Vima 1 masing-masing 100 benih. Penanaman untuk populasi bersegregasi dilakukan tanpa adanya ulangan. Pengamatan dilakukan terhadap semua individu tanpa tanaman contoh. Populasi F4 memiliki keragaman pada semua karakter kualitatif kecuali tipe tumbuh, kebiasaan membelit, dan warna garis tautan polong. Populasi F4 memiliki umur genjah dan daya hasil lebih tinggi dari Vima 1. Heritabilitas populasi F4 terendah (0%) ditunjukkan oleh umur panen 90%, bobot satu polong, dan periode panen. Umur berbunga memiliki heritabilitas tinggi dan berkorelasi sangat nyata dengan umur panen, sehingga dapat dijadikan parameter seleksi untuk sifat umur genjah., Mung bean is the third important legume crop after soybean and peanut, but in the last five years its production has decreased despite high demand. The productivity of mung bean can be increased by assembling early maturing varieties, short harvest periods, and high yields. This study aims to evaluate the agronomic character and synchronous maturing of the VR480B × Vima 1 generation F4 to obtain the advantages of short harvest periods and high yielding. The research was held in Bengkaung Village, West Lombok from March until June 2021. The genetic material consisted of 418 F4 seeds using the single seed selection method and 100 seeds from each of the parents (VR480B and Vima 1). The segregated population was planted without any replication. All of the plants were observed individually. The F4 population had diversity in all qualitative characters except growth type, twining habit, and the color of ventral suture of the immature pod. The F4 has early maturity and a higher yield than Vima 1. Days to 90% harvest, the weight of one pod, and harvest period showed the lowest heritability (0%) of F4. Days to flowering has high heritability and are significantly correlated with harvest age, so it can be used as a selection parameter for early maturing age.
Keyword: mung bean, heritability, harvest period

Judul: Phenology of Agronomic Characters of Several  Mung Bean (Vigna radiata L. Wilczek) Lines at Different Harvest Periods
Abstrak: Kacang hijau menjadi salah satu sumber protein yang banyak dikonsumsi oleh masyarakat Indonesia. Panen yang serempak sangat penting dalam budidaya kacang hijau. Penelitian bertujuan memperoleh informasi mengenai fenologi karakter agronomi galur-galur kacang hijau hasil pemuliaan IPB pada periode panen yang berbeda dan memperoleh genotipe hasil tinggi pada panen serempak. Penelitian dilaksanakan pada bulan November 2022 hingga April 2023 di Kebun Percobaan Leuwikopo IPB. Penelitian menggunakan rancangan kelompok lengkap teracak pola tersarang dengan dua faktor, faktor pertama galur kacang hijau dan faktor kedua periode panen. Masing-masing faktor terdiri atas tiga ulangan sehingga terdapat 72 satuan percobaan. Hasil penelitian menunjukkan bahwa perlakuan panen yang berbeda tidak berpengaruh nyata terhadap karakter umur berbunga, umur polong hitam pertama, tinggi tanaman saat berbunga, tinggi tanaman saat panen terakhir, jumlah cabang total, jumlah cabang produktif, dan panjang tandan bunga, namun berpengaruh sangat nyata terhadap karakter jumlah polong per tanaman, bobot polong per tanaman, dan bobot biji per tanaman. Genotipe F7-VR10/V1-29 memiliki umur berbunga, umur polong hitam pertama, umur panen, jumlah cabang produktif, jumlah polong per tanaman, bobot polong per tanaman, dan bobot biji per tanaman yang setara atau lebih baik dari pembanding Vima 1. Genotipe yang memiliki hasil tinggi pada periode panen serempak yaitu F7-VR10/V1-29., Mung bean is a source of protein that is widely consumed by Indonesian. Simultaneous harvest is very important in mung bean production. The aims of the study were to obtain information on the phenology of agronomic characters of IPB mung bean lines at different harvesting periods and to select high-yielding genotypes. The research was carried out from November 2022 to April 2023 at the Leuwikopo Experimental Field, IPB University. The study used a randomized complete block design with nested pattern with two factors. The first factor was the mung bean lines and the second factor was the harvest period. Each factor consisted of three replications so that there were 72 experimental units. The results showed that different harvest treatments had no significant effect on the characters of day to flowering, day to the first black pods, plant height at flowering, plant height at last harvest, total number of branches, number of productive branches, and length of flower bunches, but had a very significant effect on the character of the number of pods per plant, pod weight per plant, and seed weight per plant. Genotype F7-VR10/V1-29 had day to flowering, day to first black pod, day to harvest, number of productive branches, number of pods per plant, pod weight per plant, and seed weight per plant which was equal to or better than Vima 1. The highest yieldiy genotype with simultaneous harvest was F7-VR10/V1-29.
Keyword: genotipe, hasil tinggi, panen serempak, protein, rancangan tersarang

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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