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: 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: 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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