Judul: Response of Fertilizing B and NPK to the growth of sweet  corn plants (Zea mays L. Saccharata) on Dramaga Inceptisols
Abstrak: Jagung manis (Zea mays L. Saccharata) adalah salah satu tanaman pangan dan bahan baku industri di Indonesia dan dunia. Peningkatan produktivitas jagung manis dapat dilakukan melalui optimasi pemupukan nitrogen (N), fosfor (P), kalium (K) dan boron (B) merupakan hara makro dan mikro esensial yang dibutuhkan tanaman jagung untuk dapat tumbuh dan berkembang serta berproduksi secara optimal. Penelitian ini bertujuan untuk mengetahui kandungan B dan NPK dalam tanah dan tanaman serta pertumbuhan dan perkembangan jagung manis sebagai respon dari kombinasi pemberian pupuk mikro B dan NPK pada Inceptisol Dramaga. Penelitian menggunakan Rancangan Acak Kelompok (RAK) dengan delapan perlakuan (B0S0, B0S1, B1S1, B2S1, B3S1, B1S2, B2S2, B3S2) yang terdiri dari empat taraf B (0, 9, 18, 27 kg/ha) dan tiga taraf NPK (0%, 75% dan 100% std). Perlakuan diulang kedalam empat kelompok menghasilkan 32 petak percobaan. Kombinasi pemberian pupuk B dan NPK signifikan meningkatkan B tersedia dalam tanah. Selain itu, pemberian pupuk B dan NPK meningkatka panjang daun, dan kadar B dalam tanaman serta mempercepat umur berbunga betina (silking). Pemberian 9-18 kg/ha B dan 75% NPK memiliki pengaruh positif yang relatif konsisten pada semua parameter agronomis yang diteliti. Perlu adanya penelitian lanjutan untuk melihat pengaruh pemberian pupuk B dan NPK terhadap produksi jagung manis pada tanah dengan kesuburan yang berbeda-beda, serta kombinasi waktu dan cara pemupukan B., Sweet corn (Zea mays L. Saccharata) is one of the staple crops and raw materials for the industry in Indonesia and globally. Increasing the productivity of sweet corn can be achieved through the optimization of nitrogen (N), phosphorus (P), potassium (K), and boron (B) fertilization, which are essential macro and micronutrients required for the optimal growth, development, and production of corn plants. This research aims to determine the content of B and NPK in soil and plants, as well as the growth and development of sweet corn in response to the combination of B and NPK micro-fertilizer application in Inceptisol Dramaga. The study utilized a Randomized Complete Block Design (RCBD) with eight treatments (B0S0, B0S1, B1S1, B2S1, B3S1, B1S2, B2S2, B3S2) consisting of four levels of B (0, 9, 18, 27 kg/ha) and three levels of NPK (0%, 75%, and 100% standard). The treatments were replicated into four blocks, resulting in 32 experimental plots. The combination of B and NPK fertilizer application significantly increased the available B in the soil. Additionally, B and NPK fertilization enhanced leaf length, and B content in the plants, as well as accelerate the female flowering age (silking). The application of 9-18 kg/ha B and 75% NPK showed a relatively consistent positive influence on all agronomic parameters studied. Further research is needed to examine the impact of B and NPK fertilizer application on sweet corn production in soils with varying fertility and explore the timing and methods of B fertilization
Keyword: Availability, boron, NPK, soil parameters, sweet corn

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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