Judul: Effect of Liming on Production  and Quality of Stylosanthes (Stylosanthes guianensis(Aubl)Sw) in UP#J Feild
Abstrak: Penelitian ini bertujuan bertujuan mengoptimasi level pengapuran terhadap produktivitas dan kualitas dari tanaman leguminosa S. guianensis. Penelitian dilaksanakan selama 4 bulan di Unit Pendidikan dan Penelitian Peternakan Jonggol (UP3J) dan Laboratorium Nutrisi Ternak Perah, Departemen Ilmu Nutrisi dan Teknologi Pakan, Fakultas Peternakan IPB. Rancangan Penelitian yang digunakan dalam penelitian ini adalah rancangan acak lengkap (RAL) dengan empat perlakuan yaitu : 0 ton ha-1 dolomit (D0), 1 ton ha-1 (D1), 2 ton ha-1 (D2), dan ton ha-1 (D3). Variabel yang diamati yaitu pH tanah setelah diberi dolomit, produktivitas tanaman (tinggi tanaman, jumlah daun tanaman, berat segar tanaman, berat kering tanaman, serta N,P,K tanaman. Pemberian perlakuan 3 ton ha-1 (D3) memberikan hasil terbaik terhadap pertumbuhan dan produksi S. guianensis dibandingkan dengan perlakuan lainnya.
Keyword: dolomite, NPK, productivity, S. guianensis

Judul: Optimization of Dolomite Lime Based Calcification Doses on Plant Growth and Alfalfa Production
Abstrak: Alfalfa (Medicago sativa L.) berpotensi dibudidayakan di daerah tropis sebagai pakan ternak. Pengapuran diperlukan untuk mendukung pertumbuhan dan produksi alfalfa. Penelitian ini bertujuan untuk mendapatkan dosis pengapuran dolomit yang optimum terhadap pertumbuhan dan produktivitas tanaman alfalfa (Medicago sativa L.) pada tanah latosol di daerah tropis. Penelitian didesain menggunakan rancangan acak lengkap (RAL) yang terdiri dari 5 perlakuan dan 30 ulangan. Perlakuan terdiri dari AD0 = 0 ton ha-1 dolomit; AD1 = 1 ton ha-1 dolomit; AD2 = 2 ton ha-1 dolomit; AD3 = 3 ton ha-1 dolomit; AD4 = 4 ton ha -1 dolomit. Data dianalisis menggunakan analysis of variance (ANOVA) yang dilanjutkan dengan uji Duncan jika terdapat beda nyata (P<0,05) pada pH tanah, viabilitas tanaman, tinggi tanaman, diameter batang, jumlah cabang, jumlah daun, kerontokan daun, warna daun dan produksi tanaman. Kesimpulan dari penelitian ini, pemberian dosis dolomit 4 ton ha-1 menunjukkan hasil paling optimal dalam meningkatkan pertumbuhan dan produksi tanaman alfalfa., Alfalfa (Medicago sativa L.) is considered to have the potential to be cultivated in tropical regions as animal feed. Liming is required to support the growth and production of alfalfa. This study aimed to determine the optimal dosage of dolomite liming for the growth and productivity of alfalfa (Medicago sativa L.) on latosol soils in the tropics. The study was designed using a completely randomized design (CRD) with 5 treatments and 30 replications. The treatments included AD0 = 0 tons ha-1 dolomite; AD1 = 1 tons ha-1 dolomite; AD2 = 2 tons ha 1 dolomite; AD3 = 3 tons ha-1 dolomite; AD4 = 4 tons ha-1 dolomite. The data were analyzed using analysis of variance (ANOVA) followed by Duncan's test if significant differences were found (P<0.05) soil pH, plant viability, plant height, stem diameter, branches count, leaves count, leaves loss, leaves color and plant production. In conclusion, the application of 4 tons ha-1 showed the most optimal results in increasing the growth and production of alfalfa plants.
Keyword: alfalfa, dolomite, liming, plant growth, plant production

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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