Judul: Yield Trial of Doubled-Haploid Lines of  Black Rice in Kediri Regency  East Java
Abstrak: Kebutuhan beras fungsional meningkat seiring waktu, salah satu usaha yang dapat dilakukan untuk meningkatkan produktivitasnya ialah dengan pemuliaan tanaman. Pemuliaan secara konvensional membutuhkan waktu yang lama, sedangkan dengan kultur antera waktu pemuliaan menjadi lebih singkat. Penelitian ini bertujuan mendapatkan galur-galur dihaploid padi beras hitam dengan produktivitas hasil sama atau lebih baik dari varietas pembanding. Penelitian dilaksanakan di Kecamatan Kepung, Kabupaten Kediri Jawa Timur pada September 2020 - Maret 2021. Percobaan menggunakan rancangan kelompok lengkap teracak (RKLT) satu faktor dengan tiga ulangan. Galur yang diuji sebanyak 14 galur dengan dua varietas pembanding yaitu Aek Sibundong dan Jeliteng. Hasil penelitian menunjukkan terdapat 8 galur memiliki produktivitas setara dengan varietas Aek Sibundong, 6 galur memiliki produktivitas setara dengan Varietas Jeliteng dan 3 galur memiliki produktivitas lebih tinggi dibanding dua varietas pembanding. Dari 14 galur yang diuji, 9 galur menghasilkan warna beras coklat dan 5 galur menghasilkan warna beras ungu kehitaman. Galur-galur padi tersebut memiliki karakter unggul dengan jumlah anakan sedikit, tinggi tanaman rendah sampai sedang, jumlah gabah isi banyak, bobot 1000 butir besar dan umur panen genjah. Galur-galur terpilih dapat diuji di lokasi lainnya, diuji kualitas dan ketahanannya terhadap hama penyakit., The need for functional rice increases over time. Effort that can be made to increase its productivity is through plant breeding. Conventional breeding takes a long time, while breeding through anther culture can shorten the time. This study aimed at obtaining doubled-haploid lines of black rice with productivity similar or better than check varieties. The experiment was conducted in Kepung Subdistrict, Kediri, East Java in September 2020 - March 2021. The experiment used a one factor randomized complete block design (RCBD) with three replications. The lines were 14 with two check varieties namely Aek Sibundong and Jeliteng. The results showed that there were 8 lines had productivity equivalent to Aek Sibundong Variety, 6 lines had productivity equivalent to Jeliteng Variety and 3 lines had higher productivity than the two check varieties. Of the 14 lines tested, 9 lines produced brown rice color and 5 lines produced black purple rice color. The rice lines had superior characters with a small-number of tillers, low to medium height, many filled grain, large grains and the harvest age of early to medium. Selected lines can be tested at other locations, also for qualities and resistance to pests and diseases.
Keyword: anthocyanins, black rice, multilocation, productivity

Judul: Yield Trial of New Plant Types Rice Line from Five Populations at Low Dose Fertilization Conditions
Abstrak: Pengujian galur padi merupakan tahap untuk mendapatkan genotipe unggul untuk menghasilkan suatu varietas baru. Penelitian bertujuan menguji daya hasil dan keragaan 37 galur padi sawah bermalai lebat pada kondisi pemupukan dosis rendah. Percobaan dilakukan di Kebun Percobaan IPB Sawah Baru, Bogor menggunakan rancangan kelompok lengkap teracak (RKLT) faktor tunggal dengan dua ulangan. Galur yang diujikan terdiri atas 37 galur padi tipe baru dari lima populasi beserta 2 varietas pembanding yaitu Inpari 32 dan Ciherang. Hasil analisis menunjukkan bahwa galur-galur yang diuji memiliki produktivitas yang setara atau tidak berbeda nyata dengan varietas pembanding. Galur yang memiliki potensi produktivitas lebih tinggi daripada pembanding yaitu IPB193-F-31-1-1 (6,58 ton ha-1), IPB189-F-17-3-2 (6,26 ton ha-1), IPB187-F-117-2-1 (6,74 ton ha-1), dan IPB193-F-4-1-3 (6,28 ton ha-1), sedangkan produktivitas dari varietas pembanding Inpari 32 dan Ciherang sebesar 5,34 ton ha-1 dan 4,40 ton ha-1., Yield trial is one of stage to obtain superior genotypes to produce a new varieties. The research aimed to evaluate the yield and performance of 37 heavy panicle paddy rice lines under low-dose fertilization conditions. The experiment was conducted at the Experimental Station of IPB University, Bogor, using a single factor randomized complete block design (RKLT) with two replications. The lines evaluated consisted of 37 new rice lines from five populations along with 2 check varieties, namely Inpari 32 and Ciherang. The results of the analysis showed that the tested lines had the same productivity or had no significant effect on the check varieties. Lines that have higher productivity potential than the check varieties are IPB193-F-31-1-1 (6.58 tons ha-1), IPB189-F-17-3-2 (6.26 tons ha-1), IPB187-F-117-2-1 (6.74 tons ha-1), IPB193-F-4-1-3 (6.28 tons ha-1), while the productivity of the check varieties Inpari 32 and Ciherang were 5.34 and 4.40 tons ha-1, respectively.
Keyword: new plant type rice, potential genotype, yield trial

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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