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 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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