Judul: Planting Material Development of Large White Ginger through True Seed, Single Rhizome, and Small Size Single Rhizome of High Quality
Abstrak: Jahe putih besar (JPB) mempunyai peranan lebih tinggi dibandingkan jahe merah dan jahe putih kecil karena diversifikasi produk yang dihasilkan. Perbanyakan tanaman jahe biasanya dilakukan dengan rimpang. Ukuran benih JPB yang voluminous sekitar 40-60 g dengan 2-3 tunas menyebabkan kebutuhan benih sangat tinggi yaitu 2-3 ton ha-1 • Selama ini belum ada pemisahan budidaya rimpang konsumsi dan rimpang untuk benih. Hal tersebut menyebabkan kebutuhan benih sebelum sortasi jauh lebih besar lagi. Dalam satu lot benih rimpang, paling tinggi hanya 70% yang dapat digunakan untuk benih. Sortasi ketat diperlukan untuk mendapatkan benih rimpang yang bermutu tinggi. Teknologi produksi yang tersedia menghasilkan rimpang dengan tingkat kemasakan fisiologis yang tidak sama, sehingga dalam satu rumpun rimpang tidak semua anak rimpang dapat digunakan sebagai benih. Efisiensi bahan tanam JPB dapat dilakukan dengan mengurangi kuantitas penggunaan benih, yaitu melalui penggunaan biji botani (true seed), benih rimpang yang hanya terdiri atas satu propagul, dan penggunaan rimpang yang diperkecil ukurannya merupakan alternatif yang dapat dikembangkan untuk menekan kebutuhan bahan tanam. Pengembangan teknologi perbanyakan untuk mendapatkan bahan tanam JPB secara generatif (biji) maupun vegetatif (rimpang) telah dilakukan yang terdiri atas beberapa tahapan yaitu (1) Persyaratan pembentukan biji: kelengkapan organ produksi, ploidy dan peningkatan viabilitas serbuk sari (2) Pemanfaatan rimpang tunggal sebagai benih bermutu tinggi serta potensi produksinya (3) Penurunan ukuran benih rirnpang, penentuan waktu panen dan viabilitas benih rimpang kecil (4) Peningkatan mutu benih rimpang kecil melalui pemupukan Kalium dan pembuangan tunas., Large white ginger have more functions than small white ginger and red ginger. Ginger plants are currently propagated using rhizomes. Weight of large size rhizome seed are 40-60 g, which have 2-3 buds, this causes rhizome seed needs as high as 2-3 ton ha- 1 • At present, there has been no separation of cultivation between rhizomes seeds and rhizome consumption. It caused high rhizmome seeds. The highest is 70% that can be used for seed in a lot of rhizome seeds. Sorting have to be done to obtain high quality rhizome seeds. The production technology produces rhizomes with different physiological maturity level, not all rhizomes can be used as seed. Efficiency JPB of plant material by reduce the quantity of seeds. Using true seed, single rhizome seeds,and small size rhizome seeds/unvoluminous are alternative that can be developed to minimize of seeds. Development of propagation technology to get planting materials JPB generative (seeds) and vegetative (rhizomes) has been carried out which consists of several stages: (I) Requirements seed formation: completeness organ production, ploidy and increased viability of pollen (2) Utilization of rhizome single as high quality seed and potential production (3) Reducing the size of rhizome seeds without decreasing its quality would be beneficial, determine appropriate harvesting time for small rhizomes seeds ( 4) improve viability and storability of small size rhizome seeds through the appropriate potassium application and shoot pinchings. The aim of the experiments were: (I) to inform completeness of reproductive organs, and ploidy JPB, as well as improve viability of pollen to increase viability with boron and zinc application and its potential for pollination, (2) to evaluate viability, storability, examine growth and potential production of
Keyword: Boron, long storage ability, planting media, shoot pinching, potassium, pollen, watering intensity, zinc, Ginger plants, Rhizome seeds, True ginger seed, Medicinal crops, Rhizome borne disease

Judul: Respon Pertumbuhan Jahe Putih Kecil (Zingiber officinale var. Amarum) terhadap Pemupukan pada Media Tanpa Tanah.
Abstrak: Small ginger cultivation still have an issue, it is Ralstonia solanacearum bacteria that causes quite large yield loss. The character of Ralstonia solanacearum is soil borne and can survive a long time in the soil, so that the study was conducted using media without soil which is a mixture of coconut coir dust (cocopeat) and rice husk. The research aims to determine the growth response of small white ginger in a mixture of coconut coir media (cocopeat) and rice husk media, with the intake of certain fertilizers. The experiment was conducted in Greenhouse of Balai Penelitian Tanaman Rempah dan Obat (Balittro), Bogor, West Java Cimanggu from September 2014 to February 2015. The study using a randomized Complete Block Design Group (RKLT) one factor with six treatments and four repetition. Treatment in the form of a complete fertilizer dose applications, among others; P0 (0 g / l) as a control, P1 (1 g / l), P2 (2 g / l), P3 (3 g / l), P4 (4 g / l), and P5 (5 g / l) , The results showed that the dosage of fertilizers affect plant height, number of leaves, leaf length, height and number of tillers but had no effect on stem diameter, whereas for production factor variable dosage of fertilizer affect root length, number of roots, rhizome weight, fresh weight biomass and the dry weight of biomass but did not affect the fresh weight and dry weight of root. Small white ginger can grow well in the mixture rice husk and coconut coir dust (cocopeat) media, a dose that produces the best rhizome weight is 3 g/l (P3).
Keyword: white small ginger, rice husk, cocopeat

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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