Judul: Evaluasi Keragaan Galur-galur Padi Gogo (Oryza sativa L.) Generasi F4:5 di Tanah Latosol Cimanggu, Bogor
Abstrak: This research aim to gain information the performance of agronomic characters, broad sense heritability and correlation F4:5 generation of upland rice lines in Latosol Land Cimanggu, Bogor. The research was conducted from March 2004 until August 2004 in experiment farm BALITBIOGEN Cikeumeuh, Cimanggu Bogor. The experiment was conducted with 150 upland rice lines with 6 parental of upland rice varieties, but only 100 lines upland rice was analyzed in this experiment. This research used Head to Row method and Augmented Design with Completely Randomized Design with no replication for upland rice lines and 3 replications of parental lines. The results of this evaluation showed that F value differed for all agronomic characters except for number of spikelet per panicle, percentage of tilled grain and yield. Broad sense heritability for plant height, number of tillers, number of panicle, panicle length, percentage of tilled grain and 100 seed weight classified as high and for the number of spikelet per panicle and yield classified as medium. Correlation between plant height, number of panicle, panicle length and number of spikelet per panicle with yield was positive and significant, but correlation between number of tillers, percentage tilled grain and 100 seed weight with yield was not significant. Plant height, number of panicle and panicle length characters was used as criteria for selection, because these characters had high broad sense heritability and significant correlation with yield. The result of this research also showed that there are 20 lines of upland rice which are potential for further evaluation and development of upland rice. The lines are PMTOl-C-08, PMT02-C-12, PMT03-C-01, PMT05-C-23, PMT06- C-0l, PMT06-C-15, PMT06-C-21, PMT07-C-09, PMTl0-C-04, PMTl l-C-22, PMTl 1-C-47, PMT12-C-l l, PMT12-C-22, PMT12-C-31, PMT-15 C-14, PMTIS-C-34, PMT15-C-54, PMT18-C-35, PMT21-C-03 dan PMT21-C-09.
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Judul: Evaluasi keragaan galur-galur padi gogo Oryza sativa L. F4:5 toleran tanah masam di tanah latosol
Abstrak: Penelitian ini dilakukan untuk mengevaluasi keragaan padi gogo F4:5 hasil seleksi di tanah masam dan memperoleh informasi tentang potensi hasil galur- galur F4:5 pada tanah Latosol. Penelitian ini dilaksanakan dari bulan Februari 2004 hingga bulan Agustus 2004 di Kebun Percobaan Balai Besar Bioteknologi dan Sumberdaya Genetik Pertanian, Cikeumeuh, Cimanggu. Penelitian ini menggunakan metode head to row dimana malai yang berasal dari tanaman F4 ditanam sebagai baris (galur). Rancangan perlakuan yang digunakan adalah augmented design dengan rancangan lingkungan rancangan acak lengkap. Bahan tanaman yang digunakan adalah 95 galur F4:5 hasil seleksi di tanah masam dan enam tetua yang diulang tiga kali untuk menduga pengaruh lingkungan. Tetua yang digunakan dalam penelitian ini adalah Saitu Gintung, Jatiluhur, Gajah Mungkur, CT6510-24-1-3, B8503E-TB-9-0-3, Krowal dan IR64 Hasil penelitian menunjukkan terdapat perbedaan keragaan untuk karakter tinggi tanaman, jumlah anakan, jumlah malai, persentase gabah, isi, bobot seratus butir dan bobot per rumpun dari galur-galur yang diuji. Seleksi yang dilakukan berhasil mengubah nilai tengah galur-galur walaupun perubahan nilai tengah galur-galur tidak selalu positif. Sebagian besar karakter yang digunakan memiliki nilai heritabilitas yang tinggi kecuali karakter jumlah gabah per malai (47.819%). Nilai heritabilitas tertinggi adalah 92.590% untuk karakter jumlah gabah per malai. Nilai korelasi tertinggi adalah 0.480 (P-value= 0.000) untuk karakter jumlah malai dan terrendah adalah -0.005 (P-value = 0.972) untuk karakter tinggi tanaman. Hasil seleksi di Fs memilih 19 individu terbaik dari 15 galur terbaik berdasarkan karakter jumlah malai dan bobot seratus butir. Pemilihan karakter ini berdasarkan nilai korelasi yang tinggi dan nyata serta nilai heritabilitas. Karakter ini mampu menduga bobot per rumpun karena rataan bobot per rumpun galur terbaik lebih tinggi daripada rataan bobot per rumpun galur-galur yang diuji. Individu terbaik dari galur terbaik adalah PMT08-J-4-6, PMT08-J-4-10, PMT08- J-7-6, PMT08-J-7-10, PMT16-1-10-7, PMT16-J-10-8, PMT12-J-2-3, PMT12-1-2- 6, PMT16-J-2-2, PMT14-J-15, PMT08-J-5-3, PMT13-J-13-3, PMT-13-J-11-5, PMT13-J-20-7, PMT13-J-15-4, PMT14-J-7-2, PMT18-J-6-8, PMT18-J-1-3, PMT16-J-1-4
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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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