Judul: Evaluation of Fertilizer Dosage on Sweet Corn With The Deviation of Optimum Percentage Methods
Abstrak: Jagung manis adalah salah satu komoditas pertanian yang banyak dibudidayakan di Indonesia, namun produktivitasnya belum bisa memenuhi permintaan industri pangan, oleh karena itu masih di impor. Salah satu cara meningkatkan hasil jagung manis adalah dengan memupuk sesuai dengan kebutuhan tanaman. Metode rekomendasi pupuk Deviation of Optimum Percentage (DOP) merupakan metode rekomendasi pupuk dengan pendekatan langsung, melalui perbandingan kadar hara tanaman dengan kadar hara referensi pada bagian jaringan dan umur tanaman yang sama. Percobaan dilakukan di Kebun Percobaan Cikabayan, IPB Darmaga Bogor. Rancangan Acak Kelompok dengan 10 perlakuan dan diulang 3 kali digunakan dalam percobaan ini. Perlakuan percobaan meliputi kombinasi pupuk hayati cair (PH) dengan pupuk mineral dengan dosis 1/3 dan 2/3 dari dosis pupuk standar. Dosis pupuk mineral standar untuk jagung manis adalah 300 kg/ha Urea, 200 kg/ha SP-36, dan 150 kg/ha KCl. Dosis standar PH dari formulator adalah 8 liter/ha dengan pengenceran 50 kali. Data hasil percobaan disidik ragam dan diuji lanjut dengan uji jarak berganda Duncan pada selang kepercayaan 5%. Analisis data yang lain meliputi perhitungan indeks hara DOP, dosis pupuk, dan analisis efektivitas agronomik relatif. Hasil percobaan menunjukkan perlakuan pupuk mineral, hayati dan kombinasinya berpengaruh nyata pada kadar N, P, K daun bendera jagung manis pada tingkat silking. Evaluasi kebutuhan hara berdasarkan metode DOP menunjukkan bahwa P adalah hara yang paling kekurangan disusul N yang saling bertukar urutan dengan K. Rekomendasi dosis pupuk jagung manis berdasarkan metode DOP di lahan percobaan sebesar 357 kg/ha Urea, 287 kg/ha SP-36, dan 203 kg/ha KCl. Perlakuan pupuk hayati cair pada dosis 8 dan 16 l/ha dapat menyamai peran 1/3 – 2/3 standar dosis pupuk mineral dalam memasok hara. Efektivitas pupuk tertinggi diperoleh pada perlakuan 2 UG+2/3 STD yang setara dengan 16 l/ha UG, 200 kg/ha Urea, 133.4 kg/ha SP36 dan 100 kg/ha KCl. Pupuk hayati dapat meningkatkan efisiensi penggunaan hara, namun peranannya sangat tergantung kondisi lingkungannya ., Sweet corn is one of the agricultural commodities that is widely cultivated in Indonesia, but its productivity has not been able to meet the demand for the food industry, therefore it is still imported. One way to increase the yield of sweet corn is fertilized according to the needs of the plant. The Deviation of Optimum Percentage (DOP) fertilizer recommendation method is a fertilizer recommendation method with a direct approach, by comparing plant nutrient levels with reference nutrient levels in the same tissue section and plant age. The trial was carried out at the Cikabayan Experimental Garden, IPB Darmaga Bogor. Randomized block design with 10 treatments and 3 repetitions was used in this trial. The trial treatment included a combination liquid biofertilizer (PH) with mineral fertilizers at a dose of 1/3 and 2/3 of the standard fertilizer dose. Standard mineral fertilizer dose for sweet corn are 300 kg/ha Urea , 200 kg/ha SP-36, and 150 kg/ha KCl. The standard dose of PH based on PH formulator is 8 liters/ha with 50 times dilution. The trial data were F-tested and Duncan's multiple range test at a 5% confidence interval. Other data analysis includes DOP nutrient index calculation, fertilizer dosage, and analysis of relative agronomic effectiveness. The
Keyword: Deviation of Optimum Percentage, corn, fertilization

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.
Keyword: