Judul: Efektivitas penggunaan beberapa jenis alas tanam dan aplikasi GA3 pada pertumbuhan dan produksi benih kacang hias (Arachis pintoi Krap & Greg)
Abstrak: Kacang hias (Arachis pintoi Krap & Greg.) merupakan tanaman yang sering dimanfaatkan sebagai tanaman penutup tanah. Perbanyakan dapat dilakukan secara vegetatif maupun generatif. Penelitian terkait bahan perbanyakan dilakukan bertujuan: (1) mengetahui konsentrasi GA3 dalam produksi benih sebagai bahan perbanyakan generatif, dan (2) mengetahui alas tanam yang efektif dalam penanaman dan pemanena rumpun sebagai bahan perbanyakan vegetatif. Masing masing tujuan dapat dicapai dengan percobaan terpisah secara pararel. Kedua percobaan disusun dengan rancangan kelompok lengkap teracak (RKLT) faktor tunggal. Percobaan 1 menggunakan faktor tunggal dengan taraf konsentrasi berupa konsentrasi 0, 75, 150, 225, dan 300 ppm. Percobaan 2 menggunakan faktor tunggal dengan taraf perlakuan tanpa alas (kontrol), kain peles, jaring berbahan dasar poliester 1 x 1 cm, dan tray semai. Hasil percobaan 1 menunjukkan rentang konsentrasi 130–150 ppm memberikan pengaruh terhadap penambahan individu terbanyak, meningkatkan produksi bunga, menghasilkan polong terpanen terbanyak dan daya berkecambah benih tertinggi. Percobaan 2 menunjukkan penggunaan alas tanam jaring berbahan dasar poliester 1 x 1 cm dan tray semai memiliki efektivitas terbaik dalam pertumbuhan dan pemanenan rumpun berdasarkan persentase penutupan tanah, pertumbuhan tanaman, bobot terpanen, serta waktu selama pemanenan., Pinto peanut (Arachis pintoi Krap & Greg.) is often used as a legume cover crop. Propagation can be done vegetatively or generatively. Research related to propagation materials was carried out with the aims of (1) knowing the concentration of GA3 in seed production as a generative propagation material and (2) knowing an effective placemat for planting and harvesting pols as vegetative propagation material. Separate experiments in parallel can achieve each goal. Both trials were arranged in a single-factor randomized complete block design (RCBD). Experiment 1 used a single factor with concentration levels of 0, 75, 150, 225, and 300 ppm. Experiment 2 used a single factor with the level of treatment without a base (control), a cloth, a net made of polyester 1 x 1 cm, and a seedling tray. The results of experiment 1 showed that the concentration range of 130–150 ppm affected the addition of the most individuals, increasing flower production, producing the most harvested pods, and the highest seed germination. Experiment 2 revealed that using a 1 x 1 cm polyester-based planting mat and the seedling tray was examined to be most effective in the growth and harvesting of pols based on the percentage of soil cover, plant growth, harvested weight, and time during harvesting.
Keyword: growth regulators, legume cover crop, pods, soil covering, stolons

Judul: Propagation of Pinto Peanut (Arachis pintoi Krap. & Greg.) with Overlay System by Using Hollow Lining and Crumb Planting Media
Abstrak: Budidaya kacang hias (Arachis pintoi Krap. & Greg.) menggunakan alas terpal dapat menyingkat proses panen kacang hias namun laju penutupan lahan oleh kacang hias melambat. Penelitian ini mempelajari efektifitas budidaya kacang hias menggunakan alas jaring dan media tanam yang remah. Rancangan yang digunakan adalah rancangan kelompok lengkap teracak (RKLT) dua faktor, yaitu jenis alas dan jenis media tanam. Alas yang digunakan adalah jaring dengan ukuran rongga sebesar 0.4 cm × 0.4 cm, 1 cm × 1 cm, 2 cm × 2 cm, serta tanpa alas. Media tanam yang digunakan adalah pasir, kompos daun bambu, sekam basah, dan arang sekam. Masing-masing diulang sebanyak tiga kali sehingga pada penelitian ini terdapat 48 satuan percobaan. Setiap satuan percobaan berupa petakan dengan ukuran 2 m × 1 m. Hasil yang diperoleh adalah perlakuan media pasir menghasilkan penutupan 100% petak saat 103,76 hari setelah tanam (HST), media kompos daun bambu saat 109,78 HST, media sekam basah saat 111,81 HST, dan media arang sekam saat 132,42 HST. Jaring berongga 0.4 cm × 0.4 cm dan 1 cm × 1 cm masih kokoh dan dapat digunakan secara berulang sebagai alas tumbuh kacang hias hingga sekitar tiga masa tanam. Kata kunci: kacang hias, jaring, pasir, kompos daun bambu, sekam, arang sekam, Propagation of Pinto Peanut (Arachis pintoi Krap. & Greg.) with Overlay System by Using Hollow Lining and Crumb Planting Media. Supervised by JUANG GEMA KARTIKA. Pinto peanut (Arachis pintoi Krap. & Greg.) cultivation using a tarp as base lining shortens the harvesting process of pinto peanut however reduces it’s surface covering rate. This research study the effectiveness of pinto peanut cultivation using holed lining and crumb growth medium. The research design used was a randomized complete block design (RCBD) with two factors, which are lining type and growth medium type. Used linings were 0.4 cm × 0.4 cm, 1 cm × 1 cm, 2 cm × 2 cm holed linings, and without lining. The used planting media was sand, bamboo leaf compost, rice husk, and burnt rice husk. Each was replicated three times thus this research had 48 test units. Each test unit consisted of 2 m × 1 m bedding. The results obtained were sand growth medium gave 100% land coverage at 103,76 days after planting (DAP), bamboo leaf compost medium at 109,78 DAP, raw rice husk medium at 111.81 DAP, and burnt rice husk medium at 132.42 DAP. The 0.4 cm × 0.4 cm and 1 cm × 1 cm nets were still intact and can be used repeatedly for aproximately 3 planting seasons. Keywords: pinto peanut, net, sand, bamboo leaf compost, raw rice husk, burnt rice husk
Keyword: kacang hias, jaring, pasir, kompos daun bambu, sekam, arang sekam

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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