Judul: Effect of Doses of NPK Fertilizer on Growth and Yield of  Payo Rice Mutant Strains
Abstrak: Penelitian ini bertujuan untuk menjelaskan respon pertumbuhan dan hasil galur mutan padi Payo terhadap perlakuan dosis pupuk NPK. Penelitian dilaksanakan di green house Badan Riset dan Inovasi Nasional (BRIN), Pasar Jumat, Lebak Bulus, Jakarta Selatan pada bulan Maret-Agustus 2023. Percobaan ini disusun menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) secara faktorial, yaitu faktor genotipe dan dosis pupuk NPK. Perlakuan genotipe terdiri atas 10 galur mutan padi Payo dan 2 varietas pembanding Induk Payo dan Inpari 32. Perlakuan dosis NPK terdiri dari tiga taraf yaitu 0%, 50% dan 100% dari dosis anjuran 350 kg ha-1 . Hasil penelitian menunjukkan bahwa perlakuan genotipe berpengaruh sangat nyata terhadap seluruh karakter yang diamati. Perlakuan dosis pupuk NPK berpengaruh sangat nyata pada karakter tinggi tanaman, jumlah anakan produktif, jumlah anakan total, jumlah gabah total permalai, gabah isi, gabah hampa, bobot gabah per rumpun dan dugaan hasil. Interaksi antara perlakuan genotipe dan dosis NPK berpengaruh sangat nyata hanya pada tinggi tanaman dan jumlah anakan total. Perlakuan dosis pupuk NPK 50% dari anjuran tidak berbeda nyata dengan dosis 100% untuk peubah komponen hasil jumlah gabah total, gabah hampa, gabah isi, bobot gabah per rumpun dan dugaan hasil (produktivitas). Seluruh galur yang diuji memiliki nilai dugaan hasil lebih tinggi dibandingkan varietas pembanding payo dan Inpari-32. Galur PY-09 dan PY-10 mampu berproduksi di atas 7 ton ha-1 dengan nilai dugaan hasil masing-masing 7,34 ton ha-1 dan 7,29 ton ha-1. Seluruh galur mutan padi Payo, terutama PY-09 dan PY 10, perlu dikembangkan lebih lanjut sebagai varietas unggul untuk pertanian organik yang adaptif terhadap input rendah pupuk NPK., This study aimed to determine the growth response and yield of the Payo rice mutant lines to the treatment of NPK doses. The study was carried out in the green house of the National Research and Innovation Agency (BRIN), Pasar Jumat, Lebak Bulus, South Jakarta in March-August 2023. The experiment was arranged using a Randomized Complete Block Design (RCBD) with 2 factors, namely genotype and dose NPK. The genotype treatment consisted of 10 Payo rice mutant lines and 2 check varieties, Payo and Inpari 32. The NPK doses consisted of three levels, namely 0%, 50% and 100% of the recommended dose of 350 kg NPK/ha. The results showed that the treatment of genotype had a very significant effect on all of characters observed. The treatment of NPK dosage had a very significant effect on plant height, number of productive tillers, total tiller number, total grain number per panicle, filled grain, empty grain, grain weight per clump and estimated yield. The interaction between genotype and NPK dosage had a very significant effect on plant height and total number of tillers. The 50% recommended dose of NPK was not significantly different from the 100% dose for the total amount of grain, empty grain, filled grain, weight of grain per clump and estimated yield (productivity). All lines tested had higher estimated yield than the check varieties Payo and Inpari-32. The PY-09 and PY-10 lines were able to produce more than 7 tonnes/ha with estimated yields of 7.34 and 7.29 tonnes/ha. All Payo mutant lines, especially PY-09 and PY-10, need
Keyword: genotype, mutant, NPK fertilizer dosage, organic farming, productivity

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: 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: