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: Pengembangan Teknologi Perbanyakan Bibit nenas smooth cayenne secara in vivo melalui aplikasi auksin dan sitokinin
Abstrak: Pineapple plantation needs 40.000-60.000 seedlings per hectare, so it is important to have simple, efficient and effective propagation technology. The objectives of this research are to study the effect of IBA and BA to improve the success of seed production by in vivo. The study was conducted in three experiments. The first and the second experiment were to study the effect of indole-3-butyric acid (IBA) at 0, 25, 50 ppm and Benzyl Adenine (BA) at 0,25,50 and 75 ppm on the successful of basal leaf cuttings from stem and crown of pineapple GP-1 (Ananas comosus L. Merr). The third experiment was to determine the effect of sytokinin on the different size of buds generated from crown leaf cuttings. The result showed that leaf cutting from stem potential used as an alternative materials for seed propagation of pineapple. Increased of auxin concentration up to 50 ppm on leaf cuttings of stem inhibit shoot height. Contrarily, cytokinin treatment up to 50 ppm increased the height of shoots. Application of auxin up to 50 ppm on leaf cuttings of crown increase the percentage of rooted cuttings and percentage of budding per shoots (2-3 shoot per cutting), but application of cytokines up to75 ppm suppress seedling height, width leave and reduce the emergence rate of shoots at 50 ppm. Application of cytokinin (BA) 25 ppm and 50 ppm increased the percentage of sprouted cuttings and number of nodules on small buds and medium buds. Percentage sprouted cutting on small buds higher than medium and bigger buds. Using economic analysis, it is showed that IBA 50 ppm application on crown leaf cuttings is the most optimum materials used for seed propagation by in vivo.The success of seed multiplication in vivo through cuttings leave from the crown better than cuttings from leave stem.
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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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