Judul: Performance Evaluation and Yield Power on the IPB Purple Hybrid Sweet Corn (Zea mays saccharata Sturt).
Abstrak: Jagung manis (Zea mays saccharata Sturt) atau sweet corn merupakan komoditas hortikultura yang banyak digemari. Perakitan varietas jagung manis ungu perlu terus dilakukan untuk mendukung peningkatan produktivitas jagung manis dan progam biofortifikasi pangan. Institut Pertanian Bogor memiliki beberapa galur hibrida jagung manis ungu yang belum diuji keunggulannya. Penelitian ini bertujuan mengetahui keunggulan calon varietas jagung manis ungu IPB. Penelitian dilakukan bulan Oktober-Januari di kebun Percobaan PKHT IPB Pasir Kuda. Penelitian terdiri atas 1 faktor yaitu genotipe (1 genotipe uji dan 3 varietas komersil). Penanaman menggunakan rancangan kelompok lengkap teracak yang terdiri atas 4 ulangan. Hasil penelitian menunjukkan bahwa produktivitas genotipe uji JMU H1 IPB lebih rendah dibandingkan varietas pembanding. Padatan terlarut total genotipe uji setara dengan varietas pembanding potensial digunakan sebagai penciri utama genotipe JMU H1 IPB yaitu adanya antosianin yang kuat pada tulang daun, ruas batang, akar penyangga, selain dasar bunga jantan, pada rambut bunga betina, dan warna kelobot yang merah keunguan (N79 C)., Sweet corn (Zea mays saccharata Sturt) is a popular horticultural commodity. The assembly of IPB purple sweet corn varieties needs to continue to support to increase sweet corn productivity and the food biofortification program. The Bogor Agricultural Institute has several hybrid lines of purple sweet corn which superiority character has not been tested. This research was aimed to determine the superiority of the candidate of IPB purple sweet corn variety. Observations were carried out in October-January at the PKHT IPB Pasir Kuda Experimental Garden. The research consisted of 1 factor, namely genotype (1 test genotype and 3 commercial varieties). The experimental design was arranged in randomized complete group design consisting of 4 replications. The results showed that the productivity of the JMU H1 IPB genotype was lower than the comparison variety. The sugar content of total soluble solids of JMU H1 IPB were equivalent than the comparison variety. Characters that have the potential to be used as the main characteristics of the JMU H1 IPB genotype are the presence of strong anthocyanins in the leaf veins, stem segments, supporting roots, apart from the base of the male flowers, the hairs of the female flowers, and the purplish red color of the husks (N79 C).
Keyword: antosianin, biofortifikasi, hibrida, jagung manis, varietas unggul

Judul: Evaluation of Performance and Yield of Hybrid Sweet Corn (Zea mays saccharata Sturt.) from IPB Breeding Results
Abstrak: Evaluation of performance and yield is essential in plant breeding activities. This study aims to evaluate the performance and obtain the yield of hybrid sweet corn due to IPB breeding. The research was conducted from January 2023 to April 2023 at the Pasir Kuda PKHT and the AGH IPB Plant Breeding Laboratory. The study consisted of one factor, namely 14 genotypes of hybrid sweet corn. The experiment used a completely randomized block design (RCBD) with three replications. The results showed differences in performance and yield between sweet corn genotypes. Genotype significantly affected all quantitative characters observed except for Anthesis Silking Interval (ASI), Total Dissolved Solids (TDS) characters, and seed width. Based on the research results, genotypes SM9.3A.1 x SB.13.1.4, genotypes SB.13.1.3B x T10.97B, and genotypes T10.97B x SB13.1.3B have productivity between 19.01-20.6 tons per hectare higher than the comparison variety Talenta of 13.68 tonnes. The Exsotic control variety had the highest productivity among the test genotypes at 21.33 tonnes. However, it was not significantly different from the T10.97B x SB13.1.3B genotypes, with 20.6 tonnes per hectare productivity. The harvesting age of the test genotypes ranged from 72-75 DAP, and the control varieties ranged from 72-73 DAP. The test genotypes had varying sweetness levels from 11.03-16.57 brix, while the control varieties only ranged from 12.60-12.63 brix., Evaluasi keragaan dan daya hasil penting dalam kegiatan pemuliaan tanaman. Penelitian ini bertujuan mengevaluasi keragaan dan memperoleh daya hasil jagung manis hibrida hasil pemuliaan IPB. Penelitian dilaksanakan pada bulan Januari 2023 sampai April 2023 di Kebun Percobaan PKHT Pasir Kuda dan Laboratorium Pendidikan Pemuliaan Tanaman AGH IPB. Penelitian terdiri dari satu faktor yaitu 14 genotipe jagung manis hibrida. Percobaan menggunakan rancangan kelompok lengkap teracak (RKLT) dengan tiga ulangan. Hasil penelitian menunjukkan terdapat perbedaan keragaan dan daya hasil antara genotipe jagung manis. Genotipe berpengaruh nyata terhadap semua karakter kuantitatif yang diamati kecuali pada karakter Anthesis silking interval (ASI), Padatan Terlarut Total (PTT), dan lebar biji. Berdasarkan hasil penelitian genotipe SM9.3A.1 x SB.13.1.4, genotipe SB.13.1.3B x T10.97B, dan genotipe T10.97B x SB13.1.3B memiliki produktivitas antara 19,01-20,6 ton.ha-1 lebih tinggi daripada varietas pembanding Talenta sebesar 13,68 ton.ha-1. Varietas pembanding Exsotic memiliki produktivitas paling tinggi diantara genotipe uji sebesar 21,33 ton.ha-1, namun tidak berbeda nyata terhadap genotipe T10.97B x SB13.1.3B dengan produktivitas sebesar 20,6 ton.ha-1. Umur panen genotipe uji berkisar 72-75 HST dan varietas pembanding berkisar 72-73 HST. Genotipe uji memiliki tingkat kemanisan yang bervariasi dari 11,03-16,57 brix, sedangkan varietas pembanding hanya berkisar 12,60-12,63 brix.
Keyword: characters, genotypes, plant breeding, varieties, productivity

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.
Keyword: