Judul: Penentuan Dosis Optimum Pupuk Nitrogen pada Kemangi (Ocimum basilicum) di Tanah Inceptisol.
Abstrak: Penelitian ini dilakukan untuk menentukan dosis optimum pupuk nitrogen yang dapat memberikan hasil maksimum pada produksi (Yield) tanaman kemangi aksesi KM4 di tanah Inceptisol. Penelitian ini dilakukan mulai 10 Juni 2015 sampai 15 Oktober 2015 di Kebun Percobaan ADS (Agribusiness Development Station), Dramaga, Bogor. Percobaan ini menggunakan Rancangan Kelompok Lengkap Teracak (RKLT). Perlakuan yang diberikan terdiri dari lima taraf yaitu, 0X, ¼X, ½X, ¾X dan X. Dimana X = 240 kg ha-1 N atau 533 kg ha-1 Urea. Masing-masing perlakuan dilakukan 4 kali ulangan. Dosis P dan K yang digunakan adalah 100 kg ha-1 P205 dan 100 kg ha-1 K20. Hasil penelitian menunjukkan perlakuan dosis N pada tanaman kemangi meningkatkan secara kuadratik bobot kering per tanaman kemangi dan meningkatkan secara linier bobot panen per tanaman, bobot panen per petak, bobot panen per hektar, jumlah cabang panen per tanaman, dan jumlah cabang panen per petak, jumlah cabang panen per hektar. Dosis rekomendasi pemupukan N di Inceptisol Dramaga adalah 154,05 kg ha-1., This study was conducted to determine the optimum rate of nitrogen fertilizer for basil on inceptisols. The study was conducted on 10th June 2015 until 15th October 2015 at ADS (Agribusiness Development Station) Experimental Farm, Dramaga, Bogor. The study was arranged in Randomized Complete Block Design (RCBD). There were 5 rates of N in this study, i.e. 0X, ¼X, ½X, ¾X, and X. Where X = 240 kg ha-1 or 533 kg ha-1 Urea. Each treatment was repeated 4 times. Rate of P and K were 100 kg ha-1 P205 and 100 kg ha-1 K20. The result of this study showed that N application increased quadratically dry weight per plant of basil and increased linearly yield per plant, yield per plot, yield per hectare, amount of branches per plant, and amount of branches per plot, amount of branches per hectare. Recommendation rate of N fertilizer on Inceptisols Dramaga is 154,05 kg ha-1.
Keyword: inceptisol, indigenous, kemangi, produksi, urea

Judul: Penentuan Dosis Optimum Pemupukan Kalium Pada Pertumbuhan Dan Hasil Panen Kemangi (Ocimum Bacilicum L.) Di Inceptisol Dramaga
Abstrak: Penelitian ini bertujuan untuk mengetahui dosis optimum pemupukan Kalium pada pertumbuhan dan hasil panen kemangi di Inceptisol Dramaga. Bahan tanaman percobaan yang digunakan adalah kemangi aksesi KM 4 berasal dari Garut, Jawa Barat. Percobaan dilaksanakan di kebun Agribusiness Development Station (ADS), Bogor, mulai Juni 2015 hingga Oktober 2015. Rancangan percobaan yang digunakan yaitu Rancangan Kelompok Lengkap Teracak (RKLT) 1 faktor dengan 5 taraf perlakuan dosis pemupukan K, yaitu 0 kg ha-1 K2O, 40 kg ha-1 K2O, 80 kg ha-1 K2O, 120 kg ha-1 K2O dan 160 kg ha-1 K2O. Dosis N dan P yang digunakan adalah 150 kg ha-1 N and 100 kg ha-1 P2O5. Hasil penelitian menujukkan aplikasi K berpengaruh nyata pada tinggi tanaman, bobot panen per tanaman dan tidak nyata pada jumlah cabang, jumlah cabang per tanaman saat panen, bobot basah brangkasan, bobot kering brangkasan, bobot panen per petak serta bobot panen per hektar. Aplikasi pupuk K dari 0 hingga 160 kg ha-1 memberikan respon linear terhadap tinggi tanaman dan bobot panen per tanaman. Dosis rekomendasi pemupukan Kalium di Inceptisol Dramaga belum dapat ditentukan.
Keyword: aplikasi, KM 4, K2O, pupuk

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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