Judul: The use of Ecoenzyme and Liquid Organic Fertilizer in Potato (Solanum tuberosum L.) IPB CP3
Abstrak: Kentang IPB CP3 merupakan salah satu varietas yang dikembangkan IPB untuk industri keripik kentang. Ketersediaan benih berkualitas penting untuk meningkatkan produksi kentang. Salah satu faktor penentu adalah pemberian pupuk. Penelitian ini menganalisis pengaruh ekoenzim dan pupuk organik cair (POC) terhadap pertumbuhan dan produksi umbi kentang IPB CP3 generasi ke-0 (G0). Penelitian dilakukan di rumah kaca yang berlokasi di Desa Kayu Ambon, Lembang, Kabupaten Bandung Barat. Penelitian ini menggunakan faktor perlakuan pupuk yaitu ekoenzim dan POC Magnon yang dirancang secara acak lengkap dengan sembilan ulangan. Tanaman ditanam pada polybag yang berisi media cocopeat. Hasil percobaan menunjukkan perlakuan ekoenzim dan POC Magnon dapat meningkatkan bobot basah, bobot kering, laju pertumbuhan, bobot umbi kecuali tinggi tanaman dan jumlah umbi. Konsentrasi ekoenzim dan POC perlu ditingkatkan untuk memaksimalkan pertumbuhan dan produksi umbi.
Keyword: IPB CP3 potato,, seed., ecoenzyme, POC

Judul: Efektivitas Pupuk Organik Cair pada Kentang (Solanum tuberosum L.) IPB CP3 yang Ditanam di Rumah Kaca dan Rumah Kasa
Abstrak: Kentang IPB CP3 merupakan salah satu varietas yang dikembangkan IPB untuk memenuhi kebutuhan bahan baku industri keripik kentang. Penyediaan benih kentang yang baik dibutuhkan untuk meningkatkan produksi kentang sayur maupun kentang industri. Faktor yang diduga mempengaruhi produksi benih kentang diantaranya adalah pemberian pupuk dan rumah penanaman. Penelitian ini bertujuan untuk menganalisis pengaruh aplikasi pupuk organik cair dan rumah penanaman terhadap pertumbuhan dan produksi umbi tanaman kentang IPB CP3 generasi ke-0 (G0). Pupuk organik cair (POC) yang digunakan adalah POC Magnon dan rumah penanaman kentang yaitu rumah kasa dan rumah kaca. Hasil penelitian menunjukkan pengaruh nyata pemberian POC Magnon terhadap laju pertumbuhan serta jumlah dan bobot umbi. Jenis rumah penanaman berpengaruh nyata terhadap tinggi tanaman serta jumlah dan bobot umbi. Perlakuan pemberian POC dan jenis rumah penanaman pada rumah kaca memberikan hasil yang terbaik., IPB CP3 potato is one of the potato variety developed by IPB to meet the raw material needs of the potato chips industry. The provision of good quality seeds are essential to increase the production of both vegetable and industrial potatoes. Factors that are possibly affect potato seed productions are fertilizer applications and planting house conditions. This study aimed to analyze the effect of liquid organic fertilizer and planting house on plant growth and production of IPB CP3 potato G0 generation. Fertilizer used in this study is Magnon liquid organic fertilizer and planting house were green house and screen house. Results showed a significant effect of liquid fertilizer on plant growth, number and weight of G0 tubers. Planting house has also a significant effect on plant height, number of tubers, and weight of tubers. Green house is better than screen house for planting potatoes. Combination of Magnon liquid fertilizer and green house produces better result than the other combination treatments.
Keyword: bobot umbi, jumlah umbi, pupuk organik cair, tinggi tanaman, umbi kentang, liquid organic fertilizer, plant height, potato tubers, number of tubers, weight of tubers

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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