Judul: Pengaruh Pemupukan dan Pemberian Urin Sapi Terhadap Pertumbuhan dan Tingkat ProduktivitasMedicago sativa L
Abstrak: Medicago sativa L (Alfalfa) is one of kind legume comes from Iran (Cheeke 2005). This research was conducted to measureeffect of fertilized with manure and urin of cattleforgrowth and production of alfalfa with same value of nitrogen where was tried in Ciwidey, Bandung. This research used Randomized Complete Design (RCD) with 5 treatments and 3 replications. The treatment were P1 (NPK (control) 15 g m-2), P2 (manure of chicken 0.33 kgm-2), P3 (manure of cattle 1 kgm-2), P4 (manure of chicken 0.17 kgm-2+ urine 0.3 litersm-2), and P5 ( manure of cattle 0.5 kgm-2+ urine 0.3 litersm-2). The observation was the response of plant which include presentage of seed, plant height, total leaf, as feed and dry matter of leaf and stem, crude protein and crude fiber. The result showed that the treatment of iso nitrogen which fertilized with manure and urin of cattle is not significant togrowth and productivity of alfalfa. Another result of this reaserch is the treatment P4 (manure of chicken 0.17 kgm-2+ urine 0.3 litersm-2) can subtitution NPK and showed the better growth, productivity and crude protein of alfalfa than NPK treatment.
Keyword: alfalfa, iso nitrogen, manure, production, urine

Judul: The Effectiveness of Vermicompost Fertilizer and  Arbuscular Mycorrhizal Fungi in Increasing the Productivity of Alfalfa Plants (Medicago sativa L.)
Abstrak: Penelitian ini bertujuan menguji pengaruh pemberian pupuk vermikompos dan fungi mikoriza arbuskula (FMA) terhadap produktivitas tanaman Alfalfa (Medicago sativa L.). Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan 220 sampel yang dibagi menjadi 11 perlakuan dan 20 ulangan. Perlakuan terdiri dari K0 = Media tanah tanpa perlakuan; K100 = K0 + 100% NPK; K50 = K0+ 50% NPK; AV1 = K50 + 100 g vermikompos; AV2 = K50 + 200 g vermikompos; AF1 = K50 + 10 g FMA; AF2 = K50 + 20 g FMA; AVIF1 = K50 + 100 g vermikompos + 10 g FMA; AV1F2 = K50 + 100 g vermikompos + 20 g FMA; AV2F1 = K50 + 200 g vermikompos + 10 g FMA; AV2F2 = K50 + 200 g vermikompos + 20 g FMA. Parameter yang diukur adalah persentase kolonisasi akar, tinggi tanaman, jumlah cabang, jumlah daun, diameter batang, panjang akar, berat segar akar, berat segar tajuk, dan berat kering tajuk. Hasil penelitian menunjukkan bahwa perlakuan kombinasi vermikompos dan FMA sangat berpengaruh nyata (P<0,01) dalam meningkatkan seluruh parameter yang diamati. Simpulan dari penelitian ini adalah kombinasi pupuk vermikompos 200 g dan FMA 10 g efektif meningkatkan produktivitas tanaman Alfalfa., TThis study aims to examine the effect of vermicomposting and arbuscular mycorrhizal fungi (AMF) on the productivity of Alfalfa plants (Medicago sativa L.). This study use a randomized complete design with 220 samples divided into 11 treatments and 20 repeats. The treatment consists of K0 = untreated media; K100 = K0 + 100% NPK; K50 = K0 + 50% NPK; AV1 = K50 + 100 g vermicompost; AV2 = K50 + 200 g vermicompost; AF1 = K50 + 10 g AMF; AF2 = K50 + 20 g AMF; AVIF1 = K50 + 100 g vermicompost + 10 g AMF; AV1F2 = K50 + 100 g vermicompost + 20 g AMF; AV2F1 = K50 + 200 g vermicompost + 10 g AMF; AV2F2 = K50 + 200 g vermicompost + 20 g AMF. The parameters measured are percentage of root infection, plant height, number of branches, number of leaves, stem diameter, root length, fresh weight of roots, fresh weight of leaves and steam, and dry weight of leave and steam The results showed that the combination treatment of vermicompost and FMA had a significant effect (P<0.01) in improving all observed parameters. The conclusion of this study is that the combination of vermicompost fertilizer 200 g and FMA 10 g effectively increases the productivity of Alfalfa plants.
Keyword: alfalfa, arbuscular mycorrhizal fungi (AMF), productivity, vermicompost

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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