Judul: Pengujian daya hasil galur-galur padi gogo hasil kultur antera dan resistensinya terhadap penyakit blas daun (Pyricularia grisea)
Abstrak: The objective of the research was to obtain high yielding and blast resistant line of upland rice. Research consisted of three experiments. First yield trial was conducted in Bogor from May-September 2008. Second trial was conducted in Sukabumi from November 2008-March 2009. Resistant study to blast disease was conducted in Sukabumi from November 2008-March 2009. Sixteen doubled haploid lines and four varities (Jatiluhur, Limboto, Batutegi and Cisokan) were used in the two trials. Genotypes IW-54, IW-67, WI-43, WI-44, GI-7, IG-19, IG-38, B13-2e (ranged 3,33-3,77 ton/ha) have the same yield or higher than control Batutegi (3,50 ton/ha), but they are lower than control Jatiluhur (4,71 ton/ha) and Limboto resistant control (5,35 ton/ha). Genotype IW-54, IW-56, IW- 67, WI-43, WI-44, IG-7, O18b-1, GI-19, GI-38, B13-2a, B13-2d, B13-2e, dan D19-1 were resistant to leaf blast disease. Genotype IW-64, A3-2, and A3-7 were susceptible to blast based on disease incidence. Genotype A3-2 and A3-7 were susceptible to leaf and neck blast. IW-54, IW-67, WI-43, WI-44, GI-7, IG- 19, IG-38, and B13-2e have blast resistance and high yield potential, low to medium amylase, low-high gelatinization temperature. It is suggested that those potential lines to be tested further for multilcation trials.
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Judul: Pengujian Galur-Galur Dihaploid Padi Gogo
Abstrak: Demand for rice as a main food source of Indonesia's population continues to increase along with the population increase each year. An important input to increase rice productivity is the use of superior genotype. The good lines may be obtained through anther culture. This research was to study the agronomic traits and yield of doubled haploid lines of upland rice obtained from anther culture and compared to the check varieties Batutegi and Inpago 4. The study was conducted in field trials Babakan, University Farm, Bogor Agricultural University. Research was arranged in a randomized complete block design with four replications. Variables measured were vegetative plant height, generative plant height, number of vegetative tillers, number of productive tillers, flowering time, harvesting time, panicle length, number of pithy grain per panicle, number of empty grains per panicle, number of total grains, the percentage of pithy grain per panicle, the percentage of empty grains per panicle, weight of 1 000 grains, and grain yield per plot. The result showed that genotype gave very significant effect on the observed variables. There were lines whose productivity was higher than the check varieties: GM6, GM7, and GM8.
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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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