Judul: Budidaya Trichantera gigantea untuk Peningkatan Pertumbuhan dan Produktifitas Tanaman Berbasis Jarak Tanam dan Pemupukan
Abstrak: Trichantera gigantea adalah hijauan sumber protein yang berpotensi sebagai pakan ruminansia dan monogastrik yang diuji pertumbuhan dan produktivitasnya pada penelitian ini. Rancangan percobaan yang digunakan adalah Rancangan Acak Kelompok (RAK) dengan 2 faktor. Faktor pertama adalah jarak tanam antara 100 cm x 50 cm (J1), 100 cm x 100 cm (J2), dan 100 cm x 150 cm (J3), dan faktor kedua adalah pemupukan menggunakan tiga jenis pupuk diantaranya pupuk kandang 1kg/lubang tanam (P1), pupuk NPK 15g/lubang tanam(P2), dan pupuk kombinasi (pupuk kandang 0.5kg + pupuk NPK 7.5g)/lubang tanam (P3). Peubah yang diamati adalah tinggi vertikal, pertambahan jumlah cabang dan daun, warna daun, jumlah daun yang dipanen, dan berat kering daun. Hasil yang diperoleh dianalisis menggunakan analisis sidik ragam (ANOVA) dan diperoleh hasil bahwa pupuk kandang memberikan pengaruh yang paling baik terhadap jumlah cabang, jumlah daun, jumlah daun yang dipanen, dan berat kering daun. Interaksi kedua faktor berpengaruh signifikan terhadap tinggi vertikal pada panen ke-2 dan warna daun pada panen ke-1.
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Judul: Pengembangan teknik propagasi vegetatif Trichantera gigantea dengan pemberian asam indol butirat (IBA) dan Inokulasi cendawan mikoriza
Abstrak: Trichantera gigantea is a broad leaf forage, whic11 has high protein content but still very rarely cultivated in Indonesia. A suitable propagation technique to develop this plant using by Indol Butiric Acid and mycorrhyzal inoculation is considered to improve succesfullness of plant development. The experiment was conducted to investigate methods of Trichantera gigantea propagation. Complete randomized design was used as an experimental design with 0; 50, 150, 300, 500 ppm and without and with mycorrhyza. Data were analyzed by using ANOVA and Least Significant Different. The result showed that the plant without Indol Butiric combined with mycorrhyza resulted in the highest @<0.05) buds number and root dry weight. 'Xhile mycorhyza it self improved significantly (p10.01) buds number and dry weight of root. Interaction between IBA and mycorhyza significantly (p<O.05) influenced dry weight of biomass and root infection percentage Keywords : Techniques of vegetative propagation, Trichantera gigantea, IBA, mycorhyza
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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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