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: the Effect of Fertilization on Growth and Production of Three Upland Rice Varietes
Abstrak: Padi gogo merupakan budi daya padi di lahan kering. Produktivitas padi gogo masih rendah. Penelitian ini bertujuan mempelajari pengaruh pemupukan pada pertumbuhan dan produksi Tiga Varietas padi lahan kering. Penelitian dilakukan selama 8 bulan yaitu April-Desember 2019 di Kebun Percobaan IPB Sawah Baru. Rancangan yang digunakan adalah Split plot RKLT dua faktor yaitu petak utama dan anak petak. Petak utama terdiri lima taraf yaitu tanpa pupuk (P0), pupuk hayati + pupuk NPK (P1), pupuk NPK (P2), pupuk organik 5 ton ha-1 + pupuk NPK (P3), pupuk organik 5 ton ha-1 d+ pupuk hayati + NPK (P4). Anak petak tiga taraf yaitu IPB 9G (V1), Inpago 10 (V2), dan Timur (V3). Pemupukan berpengaruh nyata terhadap tinggi tanaman, Bagan Warna Daun, jumlah anakan produktif, jumlah gabah hampa dan bobot gabah per rumpun. Varietas berpengaruh nyata terhadap jumlah anakan pada 5-9 MST, jumlah anakan tidak produktif dan jumlah anakan total., Gogo Rice is type of the rice which could be optimized cultivated in dry land. Unfortunately, the Gogo Rice’s productivity is lowest than the others. The aim of this research is to learn the effect of organic fertilizer to the growth and productivity of rice’s genotypes in dry land. The research takes place at Sawah Baru Research Field with 8 months research duration, May 2019-October 2019. The experiment was conducted in split-plot randomized complete block design with two factors, main plot and sub plot. The main plot consists 5 different fertilizers composition which are no fertilizer (P0), the organic fertilizer + NPK Fertilizer(P1), the NPK Fertilizer (P2), 5 tons ha-1 organic fertilizer + NPK Fertilizer (P3), 5 tons ha-1 organic fertilizer + composite fertilizer + and NPK (P4). The sub plot consists IPB 9G (V1), Inpago 10 (V2), and Timur (V3). The fertilization will affect the growth of the rice after 11 weeks planting with the indicator of color leaf, number of productive leaf, amount of empty rice’s grain, and the weight of collective grain. The sub plot gives significant effect on the number of productive for the period 5-9 weeks after planting, the number of unproductive leaf, and amount of total productive leaf. The best interaction between main plot and sub plot is the combination NPK Fertilizer and Organic Fertilizer.
Keyword: grain, panicle, IPB 9G, Timur

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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