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: The Effect of Potassium on the Growth and Productivity of Sweet Corn (Zea mays saccharata. Sturt)
Abstrak: Pemanfatan jagung manis yang masih banyak digunakan di Indonesia baik sebagai bahan makanan maupun bahan baku industri menyebabkan permintaannya semakin meningkat. Upaya peningkatan produktivitas jagung manis dapat dilakukan melalui teknik budidaya yang baik, salah satunya dengan pemberian pupuk kalium yang tepat. Penelitian bertujuan untuk mendapatkan dosis pupuk kalium yang dapat meningkatkan pertumbuhan dan produktivitas jagung manis. Penelitian dilakukan pada bulan November 2023 hingga Januari 2024 di Kebun Sabisa Farm IPB, Sindang Barang, Kota Bogor. Rancangan percobaan yang digunakan dalam penelitian ini adalah Rancangan Kelompok Lengkap Teracak (RKLT) faktor tunggal. Percobaan ini menggunakan satu faktor perlakuan pupuk kalium jenis MOP dengan 6 taraf perlakuan yaitu tanpa pemberian pupuk (kontrol), NPK standar (300 kg ha-1 urea, 200 kg ha-1 SP-36, dan 200 kg ha-1 KCl), 100 kg ha-1MOP, 200 kg ha-1MOP, 300 kg ha-1MOP, dan 400 kg ha-1 MOP. Percobaan diulang sebanyak 4 kali sehingga terdapat 24 satuan percobaan. Penelitian menunjukkan bahwa perlakuan dosis pupuk kalium pada jagung manis memiliki pengaruh nyata terhadap bobot brangkasan segar, bobot tongkol berkelobot, panjang tongkol, dan estimasi panen tanaman contoh pada jagung manis dengan nilai Relative Agronomic Effectiveness (RAE) diatas 95% pada perlakuan 200 kg ha-1 MOP., Sweet corn ultilization is still widely used in Indonesia both as food and industrial raw material causing its demand to increase. Efforts to increase sweet corn productivity can be done through good cultivation techniques, one of which is by applying the right potassium fertilizer. The study aimed to obtain the dosage of potassium fertilizer that can increase the growth and productivity of sweet corn. The research was conducted from November 2023 until January 2024 at Sabisa Farm IPB, Sindang Barang, Bogor City. The experimental design used in this study was a single-factor Randomized Complete Block Design (RCBD). This experiment used one treatment factor of MOP potassium fertilizer with 6 treatment levels, namely no fertilizer (control), standard NPK (300 kg ha-1 urea, 200 kg ha-1 SP-36, and 200 kg ha-1 KCl), 100 kg ha-1 MOP, 200 kg ha-1 MOP, 300 kg ha-1 MOP, and 400 kg ha-1 MOP. The experiment was repeated 4 times so that there were 24 experimental units. The study showed that the treatment of potassium fertilizer doses in sweet corn had a significant effect on fresh stover weight, cob weight, cob length, and estimated harvest of sample plants in sweet corn with Relative Agronomic Effectiveness (RAE) values above 95% in the 200 kg ha-1 MOP treatment.
Keyword: pupuk MOP, kalium, produksi, RAE., MOP fertilizer, potassium, production, RAE.

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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