Judul: Keragaan dan Stabilitas Galur-Galur Padi Gogo Tipe Baru Hasil Kultur Antera
Abstrak: Breeding of upland rice is now directed towards new plant type (NPT) architecture. NPT rice lines have been obtained from anther culture and need to be evaluated in multilocation trials. The objectives of the research were to obtain information on agronomic characters, genetic parameters, yield potential, adaptability and stability of the lines. Ten lines and two cultivars were planted at seven different location in November 2010 – March 2011. In each location, the experimental design was randomized complete block design with four replications. Observation was done on agronomic characters such as plant height, number of vegetative tiller and productive tiller, panicle length, number of filled grains per panicle, empty grains per panicle, and total grains per panicle, 1000-grain weight, grain weight per plant and yield per hectar. The results showed FM1R-1-3-1 and Fat-4-1-1 rice lines has grain weight per plant 20.3 and 18.2 grams/plant respectively and other agronomic characters that were better than eight other lines. Genotype x environmental interaction factors contributed to variance by 16.6%. The highest productivity was achieved by FM1R-1-3-1 (4.52 ton/ha). FM1R-1-3-1 showed as genotype specifically adapted to favourable environments.
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Judul: Uji stabilitas galur-galur padi gogo hasil kultur
Abstrak: The objective of this research was to study the adaptation and yield stability of upland rice lines obtained from anther culture. Ten lines of upland rice obtained from anther culture and two check varieties (Way Rarem and Batutegi) were evaluated for their potential yield in seven different locations in the rainy season 2010/2011 and 2011/2012. In each location, the design was Randomized Complete Block Design with four replications. The method of Francis & Kannenberg, Finlay & Wilkinson, Eberhart & Russel, and AMMI (Additive Main Effect Multiplicative Interaction) were used to analyze the adaptation and yield stability. WI-44 line achieved the highest yield average (4.88 ton ha-1), higher than Batutegi and not significantly different from Way Rarem and has the highest potential yield (10.28 ton ha-1) in Malang in the second season. IW-67 yielded an average of 4.53 ton ha-1, not significantly different from Batutegi and has potential yield (9.09 ton ha-1) in Malang in the second season. WI-44 line has a superior yield average in seven environment. WI-44, IW-67 and IW-56 lines have an ability to adapt in optimal environments. I5-10-1-1, GI-7 and O18-b-1 were adapted in the marginal environments with yield above the average of the genotype tested.
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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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