Judul: Pengaruh Naungan Sengon (Falcataria moluccana L.) dan Pemupukan terhadap Pertumbuhan Ganyong Putih (Canna edulis Ker.)
Abstrak: Sengon (Falcataria moluccana L.) public forests still becoming custom by Monoculture system. Alternative solution to optimalize the use of land is by agroforestry system. Agroforestry system give income benefits that non timber product. This research is shading influence of sengon and fertilization against white ganyong growth (Canna edulis Ker.). The shading treatments consist of the open area (shade intensity 0%) and sengon shaded area (shade intensity 42%). The fertilizer treatments consist O0 (no fertilizer as control), O1 (POC 350 mL/ha, 450 mL/ha), O2 (POC 700 mL/ha, 900 mL/ha), O3 (POC 1400 mL/ha, 1800 mL/ha) and NPK. The experiment by nested design. The results showed that growth of white ganyong on sengon shaded area is higher than open area to parameters hight of plant, length of leaves, width of leaves and plant biomass. Treatments of shading and fertilization did not significantly effect to tuber wights of white ganyong.
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Judul: The Effect of Sengon (Falcataria moluccana) Shade and Organic Fertilizer on Arrowroot Growth (Maranta arundinacea)
Abstrak: Agroforestri merupakan pengombinasian tanaman kehutanan (pepohonan) dengan tanaman pertanian yang dapat dilakukan secara bersamaan (pengaturan ruang) atau bergiliran (pengaturan waktu). Garut (M. arundinacea) merupakan salah satu tanaman pangan fungsional yang mampu beradaptasi dan tumbuh secara optimum di bawah naungan sehingga dapat dikombinasikan dengan sengon (F. moluccana) dalam sistem agroforestri. Tujuan penelitian ini adalah mengukur pertumbuhan Sengon Solomon F2 dalam sistem agroforestri, serta mengetahui pengaruh naungan sengon dan jenis pupuk organik terhadap pertumbuhan dan produktivitas garut. Penelitian ini menggunakan pupuk kandang sapi dan pupuk organik hayati (POH). Hasil penelitian menunjukkan pertumbuhan Sengon Solomon F2 yang berumur 3 tahun selama 5 bulan mengalami kenaikan tetapi tidak signifikan. Naungan sengon memberikan pengaruh yang nyata terhadap pertumbuhan garut dan produksi umbi yang dihasilkan, sedangkan jenis pupuk organik tidak memberikan pengaruh yang nyata. Pertumbuhan tanaman garut terbaik terdapat pada perlakuan tanpa naungan sengon dengan pemberian pupuk kandang sapi yang menghasilkan produksi umbi rata-rata sebesar 325,60 g/polybag, sehingga menghasilkan produktivitas sebesar 2,5 ton/ha.
Keyword: agroforestry, functional food, light intensity, manure, sengon

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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