Judul: Foundation seed program to be a developing centre for the commercialization of the technologically produced seed-case of upland rice seed
Abstrak: Penelitian terdiri atas 5 percobaan, yaitu penelitian L adalah menentukan tingkat Distinghish (D) antara padi gogo Var. Gajah Mungkur, Kalimutu, Jatiluhur dan Way Rarem dengan menggunakan tolok ukur KSP, KCT, jumlah anakan, jumlah anakan produktif, jumlah butir per malai, berat 1000 butir dan produksi hektar'. Penelitian II adalah menentukan tingkat Uniformity (U) masing-masing varietas dengan tolok ukur keseragaman tinggi tanaman, jumlah anakan produktif dan panjang malai.
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Judul: Advance Yield Trial of the Promising Mutant Lines of Gajah Mungkur Upland Rice
Abstrak: Pemuliaan tanaman adalah kegiatan yang dilakukan untuk memperbaiki karakter tanaman yang diwariskan pada suatu populasi baru dengan sifat genetik baru. Terdapat beberapa metode dalam pemuliaan tanaman seperti metode introduksi, persilangan, bioteknologi, dan mutasi. Penelitian ini bertujuan untuk menguji daya hasil dan komponen hasil dari 10 galur mutan harapan padi gogo Gajah Mungkur. Penelitian ini dilaksankan di Kebun Percobaan PAIR-BATAN, Lebak Bulus, Jakarta Selatan pada bulan April sampai Agustus 2021. Percobaan menggunakan rancangan kelompok lengkap teracak (RKLT) satu faktor dengan tiga ulangan. Galur yang diuji sebanyak 10 galur dengan dua varietas pembanding yaitu varietas Gajah Mungkur dan Limboto. Hasil penelitian menunjukkan bahwa produktivitas galur PMG-04-Psj, dan PMG-06-Psj cenderung lebih tinggi dibandingkan varietas pembanding Gajah Mungkur. Jumlah anakan produktif galur PMG-01-Psj, PMG-02-Psj, PMG-04-Psj, dan PMG-06-Psj berbeda nyata lebih tinggi dibandingkan varietas Gajah Mungkur dan tidak berbeda nyata dari varietas Limboto. Komponen hasil untuk karakter panjang malai dan jumlah gabah per malai galur PMG-02-Psj, PMG-04-Psj, dan PMG-06-Psj nyata lebih tinggi terhadap varietas Gajah Mungkur tetapi nyata lebih rendah terhadap varietas Limboto. Selain itu, karakter bobot 1000 butir padi galur PMG-04-Psj dan PMG-06-Psj tidak berbeda nyata terhadap varietas Gajah Mungkur dan berbeda nyata lebih tinggi terhadap varietas Limboto., Plant breeding is an activity carried out to improve the character of plants which is carried out at a certain time with new characteristics. There are several methods in plant breeding such as introduction, crossbreeding, biotechnology, and mutation methods. This study aimed to examine the yield and yield components of 10 promising mutant lines of upland rice Gajah Mungkur. This research was carried out at the PAIR-BATAN Experimental Garden, Lebak Bulus, South Jakarta from April to August 2021. The experiment used a one-factor randomized complete block design (RKLT) with three replications. There were 10 lines tested with two comparison varieties, namely Gajah Mungkur and Limboto varieties. The results showed that the productivity of the lines PMG-04-Psj, and PMG-06-Psj tended to be higher than the comparison variety Gajah Mungkur. The number of productive tillers of the PMG-01-Psj, PMG-02-Psj, PMG-04-Psj, and PMG-06-Psj lines was significantly higher than the Gajah Mungkur variety and not significantly different from the Limboto variety. Yield components for panicle length and grain count per panicle of PMG-02-Psj, PMG-04-Psj, and PMG-06-Psj lines were significantly higher for the Gajah Mungkur variety but significantly lower for the Limboto variety. In addition, the weight character of 1000 grains of rice lines PMG-04-Psj and PMG-06-Psj was not significantly different from the Gajah Mungkur variety and significantly higher to the Limboto variety.
Keyword: mutasi induksi, padi gogo, produktivitas, induced mutation, productivity, upland rice

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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