Judul: Aplikasi Giberelin dan Benzil Amino Purin dalam Produksi Subang Gladiol (Gladiolus hybridus).
Abstrak: Gladiol merupakan tanaman hias yang dibudidayakan di dataran tinggi. Bunga gladiol memiliki keistimewaan dari bentuk bunga yang indah dan memiliki kesegaran bunga 3 – 4 hari, dan mempunyai nilai jual ekonomis yang tinggi. Penelitian ini bertujuan untuk mengetahui pengaruh aplikasi zat pengatur tumbuh GA3 dan BAP dalam berbagai konsentrasi untuk meningkatkan pertumbuhan tanaman dan produksi subang gladiol. Rancangan yang digunakan adalah rancangan kelompok lengkap teracak (RKLT) dengan satu faktor yaitu penggunaan zat pengatur tumbuh dengan sembilan taraf perlakuan. Sembilan taraf perlakuan adalah tanpa rendam, rendam dengan air, rendam zat pengatur tumbuh dengan GA3 25 ppm, GA3 50 ppm, BAP 25 ppm, BAP 50 ppm, GA3+BAP 25:25 ppm, GA3+BAP 25:50 ppm, dan GA3+BAP 50:25 ppm. Hasil penelitian menunjukkan perlakuan GA3 dan BAP memberikan pengaruh nyata terhadap pertumbuhan tanaman pada 7 – 10 MST. Perlakuan yang memberikan pengaruh nyata pada tinggi tanaman adalah perlakuan kombinasi GA3+BAP dengan konsentrasi perbandingan 25:25. Hasil analisis uji korelasi menunjukkan bobot subang yang tinggi memiliki anak subang yang banyak. Hal ini ditunjukan oleh nilai koefisien korelasi sebesar 0,92. Diameter subang juga berkorelasi nyata dengan jumlah anak subang yaitu 0,87.
Keyword: Zat pengatur tumbuh, diameter subang, anak subang

Judul: Percepatan pematahan dormansi subang gladiol (Gladiolus hybridus) dengan aplikasi zat pengatur tumbuh
Abstrak: The main constraint of gladiolus cut flower production is the limited planting material. The availability of ready to plant corms is hindered by the long period of dormancy. The objective of the research was to ivestigate the effect of plant growth regulators (PGR) in breaking the dormancy of gladiolus corms cv. Nabila. The first experiment was carried out in two steps. In the first step NAA was combined with BAP. The concentration of NAA were 0, 50, 100, 150 ppm whereas BAP were 0, 50 100, 150 ppm. In the second step GA3 was combined with BAP. The concentration of GA3 were 0, 50, 100, 150 ppm whereas BAP were 0, 50 100, 150 ppm. The Randomized Complete Block Design with one factor was used in the first experiment with five replication. In the second experiment the best combination of PGR from the first experiment were selected and applied to corms with different storage periode (0, 2, 4, 6, 8 weeks). The Randomized Complete Block Design with two factor and five replication was used. The results of the first experiment showed that all treatment using NAA, GA3, BAP hastened the rooting and sprouting of the corms therefore breaking the dormancy. Considering the efficiency of dormancy breaking techniques, the treatment NAA 100 ppm and GA3 50 ppm were selected for the second experiment. The results of the second experiment showed that NAA 100 ppm and GA 50 ppm were similarly effective for breaking dormancy of the corms. The newly harvested and two weeks old corms rooted and sprouted earlier than the corms that had been longer in storage.
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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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