Judul: Increasing efficiency of pineapple seedling production using tissue culture material result through gibberellins and nitrogen fertilizer application to the leaves
Abstrak: One of the problems in pineapple cultivation in Indonesia is unavailable seeds producer who provide variety pineapple seedling, whether in its form or in it’s nature, with major quantity and short relative time. The aims of this research is to study the effect of giving Nitrogen fertilizer, gibberellin to the leaves and time application through the development pineapple seedling resulter for tissue culture propagation, counting technical and economic efficiency. The field study is held at the Center Tropical Fruits Research (PKBT), research institution and human resources (LPPM) IPB, Baranang Siang, Bogor. It was started in August until December 2010. This research used factorial random design. The first factor is time application consist of two standards, in the morning (W1) and at night (W2). The second factor is gibberellins concentration consist of three levels, 0 ppm (G0), 50 ppm (G1), 100 ppm (G2). The third factor is N fertilizer concentration consist of three levels 0 g/I (N0), 0.5 g/I (N1), 1.0 g/I (N2). There are 18 combination treatments with three repetitions with the result 54 experiment units. Each unit consists of 10 pineapple seedlings, with the result 540 experiment. Fertilizer distribution 0.5 g/I increase the seedlings high, the number of the leaves, and the width of the leaves, wet weight and dry weight. Giving extra Nitrogen can reduce the development of the pineapple seedlings. Giving gibberellins and time application cannot increase the development of pineapple seeds tissue culture result. Economic and technique efficiency was achieved by giving nitrogen 0.5g/I fertilizer.
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Judul: The Effect of Cytokinin and Auxin Treatment in the Multiplication Through in vitro Phase to Acclimatization of Pineapple (Ananas comosus (L) Merr.) cv. Smooth Cayenne.
Abstrak: The mass propagation of pineapple are hampered by low multiplication rate in natural way, therefore in vitro propagation is an alternative to overcome mass production. To support mass propagation then we need the best acclimatization way to support multiplication phase to achieved the highest mass propagation rate. The objective of this research was to elucidate the effect of Cytokinin (BA) and Auxin (NAA) that had been applied during multiplication of sub culture I and sub culture II through in vitro phase to acclimatization of pineapple (Ananas comosus L. Merr) cv. Smooth Cayenne. This research was conducted in greenhouse laboratory at Center for Tropical Fruits Studies, IPB Baranangsiang, Bogor, since July until November 2006. This research used 20 combination of treatment from two factors for each subculture 1 and subculture 2. Each subculture conducted in six groups to accomodate difference planlet’s acclimatization readiness. The first factor was 0,00μM, 4,40μM, 8,80μM, 13,32μM, and 17,76μM of BA, and the second factor was 0,00μM, 0,50μM, 1,00μM, 2,00μM of NAA. Number of leaves and plant’s height were examined every week until 13th week after acclimatization. Examination data were statistically analyzed using Complete Randomized Block Design and the means were compared with Duncan’s Multiple Range Test (DMRT) procedure at 5% level of significance. The result showed that treatment of 17,76μM BA and 2,00μM NAA, and its interactions have the highest score for subculture 1. The result of 2,00μM NAA showed the highest performance for subculture 2. Overall performance showed that subculture 1 has better growth rate than subculture 2.
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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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