Judul: Preliminary Yield Test of Several Mutant Lines of  Situgintung Upland Rice in Dry Land
Abstrak: Peningkatan jumlah penduduk setiap tahun menuntut adanya peningkatan produksi padi untuk memenuhi kebutuhan pangan. Budidaya padi gogo menjadi upaya yang dapat dilakukan untuk meningkatkan produksi padi di Indonesia dengan mengoptimalkan penggunaan lahan kering. Penelitian ini bertujuan untuk mengidentifikasi daya hasil dan komponen hasil dari 10 galur mutan padi gogo Situgintung. Penelitian dilaksanakan di Kebun Percobaan Pusat Riset Teknologi Proses Radiasi (PRTPR), ORTN-BRIN, Lebak Bulus, Jakarta Selatan pada bulan Januari hingga Agustus 2023. Penelitian ini menggunakan faktor tunggal yaitu genotipe sebagai perlakuan yang disusun dalam rancangan kelompok lengkap teracak dengan 3 ulangan. Uji beda nyata jujur digunakan untuk mengetahui perbedaan antar perlakuan. Hasil penelitian menunjukkan bahwa seluruh galur mutan yang diuji memiliki produktivitas yang sama dibandingkan dengan dua varietas pembanding Limboto dan Situgintung, kecuali galur G107 dan G29 yang lebih tinggi dibandingkan kedua varietas pembanding serta galur G229 juga nyata lebih tinggi dibandingkan dengan varietas Situgintung. Beberapa karakter menunjukkan korelasi positif terhadap produktivitas galur mutan padi gogo, meliputi lebar daun bendera, panjang batang, jumlah anakan produktif, jumlah anakan total, jumlah gabah bernas, persentase gabah bernas, jumlah gabah total, dan kerapatan gabah per malai. Karakter yang berkorelasi negatif terhadap produktivitas adalah persentase gabah hampa., The increase in population every year demands an increase in rice production to fulfill food needs. Upland rice cultivation is an effort to enhance rice production in Indonesia by optimizing dry land use. This study aimed to identify the yield capacity and yield components of 10 mutant lines of Situgintung upland rice. The research was carried out at the Experimental Station of the Radiation Process Technology Research Center (PRTPR), ORTN-BRIN, Lebak Bulus, South Jakarta from January to August 2023. This experiment used a single factor, namely genotype as treatment, which was arranged in a randomized complete group design with 3 replications. The honest significant difference test was used to determine differences between treatments. The results showed that all the mutant lines tested had the same productivity compared to the two check varieties Limboto and Situgintung, except for lines G107 and G29 which were higher than the two check varieties, and lines G229 which was higher than Situgintung varieties. Several characters showed a positive correlation with the productivity of upland rice mutant lines, including flag leaf width, stem length, number of productive tillers, total number of tillers, number of pithy grains, percentage of pithy grains, total grain number, and grain density per panicle. Characters that have a negative correlation with productivity was the percentage of empty grain.
Keyword: Mutant lines, productivity, upland rice

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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