Judul: The Effect of ZA Fertilizer on the Growth and Yield Component of Sweet Corn (Zea mays saccharata)
Abstrak: Pupuk Amonium sulfat (ZA) memiliki kandungan utama nitrogen (21%) dan sulfur (24%). Penelitian ini bertujuan untuk mempelajari pengaruh dosis pupuk ZA terhadap pertumbuhan dan komponen hasil jagung manis. Penelitian dilaksanakan pada bulan Januari hingga April 2023 di kebun Sabisa Farm IPB, Sindangbarang, Kota Bogor. Rancangan percobaan yang digunakan adalah rancangan kelompok lengkap teracak (RKLT) faktor tunggal. Perlakuan dosis pupuk terdiri dari 6 taraf, yaitu (P0) tanpa pemberian pupuk nitrogen (Kontrol), P1 (NPK standar), P2 (337,5 kg ZA), P3 (506,3 kg ZA), P4 (675 kg ZA), dan P5 (1.012,5 kg ZA). Perlakuan diulang sebanyak 4 kali, sehingga terdapat 24 satuan percobaan (petak). Hasil penelitian menunjukkan bahwa perlakuan dosis pupuk ZA pada jagung manis berpengaruh nyata terhadap pertumbuhan fase vegetatif, fase generatif, hasil panen, dan peubah hasil. Pupuk ZA dinilai efektif terhadap pertumbuhan dan produksi jagung manis dengan nilai Relative Agronomic Effectiveness (RAE) diatas 95% pada perlakuan ZA 675 kg dan ZA 1.012,5 kg. Kata kunci: dosis pupuk, nitrogen, produksi, RAE, Increasing sweet corn production must be supported by optimal cultivation, one of which was the provision of the right dose of nitrogen fertilizer. Ammonium sulfate (ZA) fertilizer has the main content of nitrogen (21%) and sulfur (24%). This study aimed to study the effect of ZA fertilizer dose on growth and yield component on sweet corn. The research was conducted from January to April 2023 at the Sabisa Farm IPB recearch garden, Sindangbara, Bogor City. The experimental design used was a single-factor randomized complete block design (RCBD). The fertilizer dose treatment consisted of 6 levels, namely (P0) without nitrogen fertilizer (Control), P1 (standard NPK), P2 (337.5 kg ZA), P3 (506.3 kg ZA), P4 (675 kg ZA), and P5 (1,012.5 kg ZA). The treatment was repeated 4 times, so there were 24 experimental units (plots). The results showed that the dose treatment of ZA fertilizer in sweet corn had a significant effect on the growth of the vegetative phase, generative phase, yield component, and yield characters. ZA fertilizer is considered effective for the growth and production of sweet corn with a Relative Agronomic Effectiveness (RAE) value above 95% in ZA 675 kg and ZA 1,012.5 kg treatments. Keywords: fertilizer dosage, nitrogen, production, RAE
Keyword: fertilizer dosage, nitrogen, production, RAE

Judul: The Effect of Organic Fertilizer Type and Inorganic Fertilizer Dose on Production and Sweetness Level of Sweet Corn (Zea mays saccharata Sturt.)
Abstrak: Jagung manis merupakan tanaman yang memiliki nilai ekonomi yang tinggi karena dapat dijadikan sebagai bahan pangan atau bahan baku industri. Peningkatan impor jagung manis dari tahun 2019 sampai 2021 menandakan bahwa produksi jagung manis nasional belum dapat mencukupi permintaan pasar. Pemupukan yang tepat akan meningkatkan hasil produksi jagung. Penelitian ini bertujuan mengetahui pengaruh jenis pupuk organik dan dosis pupuk anorganik yang paling efektif dalam meningkatkan produksi dan tingkat kemanisan jagung manis. Percobaan dilaksanakan pada bulan November 2023 hingga bulan Januari 2024 di Kebun Percobaan sawah baru, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor. Penelitian ini menggunakan rancangan split-plot RKLT dengan tiga kali ulangan. Jenis pupuk organik sebagai petak utama dan dosis pupuk anorganik sebagai anak petak. Dua jenis pupuk organik, pupuk kandang ayam dan pupuk kompos sapi dikombinasikan dengan dosis pupuk anorganik 0%, 50% 100%, dan 150% dosis pupuk acuan. Dosis pupuk anorganik 150% memberikan pengaruh terbaik terhadap karakter vegetatif dan produksi hasil jagung manis dengan produktivitas sebesar 10,9 ton ha-1. Pada penelitian ini pemupukan tidak berpengaruh nyata terhadap tingkat kemanisan jagung manis (brix)., IRSYAD RIFHANDI. The Effect of Organic Fertilizer Type and Inorganic Fertilizer Dose on Production and Sweetness Level of Sweet Corn (Zea mays saccharata Sturt.). Supervised by CANDRA BUDIMAN and PURWONO. Sweet corn is a plant that has high economic value because it can be used as food or industrial raw materials. The increase in sweet corn imports from 2019 to 2021 indicates that national sweet corn production has not been able to meet market demand. This study aims to determine the effect of the type of organic fertilizer and the dose of inorganic fertilizer that is most effective in increasing the production and sweetness level of sweet corn. The experiment will be carried out from November 2023 to January 2024 at the new rice field experimental garden, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University. This study used a split-plot RKLT design with three repeats. Type of organic fertilizer as the main plot and dose of inorganic fertilizer as a child plot. Two types of organic fertilizers, chicken manure and cow compost are combined with a dose of 0% inorganic fertilizer, 50% 100%, and 150% dose of reference fertilizer. The dose of 150% inorganic fertilizer has the best influence on the vegetative character and yield production of sweet corn with a productivity of 10,9 tons ha-1. In this study, fertilization did not have a real effect on the sweetness level of sweet corn (brix).
Keyword: fertilization, brix, productivity

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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