Judul: Evaluation of the Aplication of Growth Regulators to the Growth of Corymbia sp. IND 125 shoot cuttings in Nursery PT. Toba Pulp Lestari.
Abstrak: Corymbia adalah tanaman kayu yang mudah beradaptasi dan memiliki pertumbuhan yang cepat (fast growing) banyak digunakan dalam pembuatan pulp dan paper. Upaya peningkatan produksi bibit corymbia dapat dilakukan dengan perbanyakan tanaman melalui stek pucuk. Tujuan penelitian ini adalah menganalisis respon pertumbuhan stek pucuk tanaman IND 125 dengan pemberian 2 (dua) jenis zat pengatur tumbuh (IBA dan MSG), dan mendapatkan informasi mengenai dosis zat pengatur tumbuh yang optimal untuk pertumbuhan stek pucuk IND 125. Bahan stek diperoleh dari kebun pangkas departemen Nursery PT. Toba Pulp Lestari. Stek pucuk IND 125 diberi perlakuan tanpa zat pengatur tumbuh, IBA (500 ppm, 1000 ppm, 2000 ppm, dan 5000 ppm) serta MSG (20 g/L dan 100 g/L). Parameter keberhasilan stek pucuk IND 125 diamati dari persen hidup, persen berakar, jumlah akar, panjang akar, jumlah daun serta tinggi tanaman. Pemberian zat pengatur tumbuh berpengaruh nyata terhadap parameter persen hidup, persen berakar dan tinggi tanaman. Perlakuan MSG 20 g/L memberikan hasil terbaik pada perakaran hingga 94,67 % dan mampu meningkatkan persen hidup, persen berakar dan tinggi tanaman., Corymbia is a fast-growing and adaptable wood plant widely used in the production of pulp and paper. The way to increase production of Corymbia seedlings can be made by propogation plants through shoot cuttings. The aim of this study were analyze the growth response of IND 125 cuttings by application of 2 (two) types of growth regulators (IBA and MSG) and to obtain information about the optimal dosage of growth regulators for the IND 125 shoot cuttings. The cuttings material was obtained from the pruining garden of the Nursery department of PT. Toba Pulp Lestari. IND 125 shoot cuttings were given treatment such as without growth regulators, IBA (500 ppm, 1000 ppm, 2000 ppm, and 5000 ppm) and MSG (20 g/L and 100 g/L). Parameters for the success of IND 125 shoot cuttings were observed from survival rate, percentage of rooted, number of roots, root length, number of leaves and plant height. The aplication of growth regulators significantly affected the survival rate, rooting percentage and plant heigh. The MSG 20 g/L treatment provided the best results in rooting up to 94,67 % and was able to increase survival rate, rooting percentage and plant height.
Keyword: Corymbia, IBA, MSG, Stek Pucuk

Judul: Pengaruh pemberian ZPT (Rootone-F) terhadap pertumbuhan stek Duabanga moluccana, Blume.
Abstrak: INTRODUCTION Insufficient supply of raw materials to support wood based industries in Indonesia cause of the changes on orientation for wood supply from natural forest to plantation forest in developing fast growing tree species. Duabanga mollucana Blume, is an Indonesian native fast growing tree species that have good characteristic as raw materials for wood based industries. Vegetative propagation can be done to this species besides their ability to be propagated from seed. Shoot and stem cuttings are alternative ways to obtain qualified seedlings in appropriate amounts and timely manner. Plant growth regulator treatment was expected to increase cutting's survival rate and rooting percentage. Objective of this research was to determine the effect of plant growth regulator on the growth of shoot and stem cutting of Duabanga moluccana. This research would be useful to provide information for the production for high quality seedlings. MATERIAL AND METHOD This research was carried out on green house with KOFFCO system (Komatsu-Forda Fog Cooling System) at Balai Penelitian dan Pengembangan Hutan dan Konservasi Alam, Gunung Batu, Bogor, West Java. from August to october 2010. Materials used in this research were shoot and stem of Duabanga seedlings from selected mother trees (M07) from SEAMEO BIOTROP, Rootone-F, Dithane M-45, rice husk, cocopeat, and zeolite. The experimental design in this research was completely randomized design with 2 factors and 3 replicates. The first factor was source of cutting material (shoot and stem) and the second factor was concentration of plant growth regulator (0 ppm, 500 ppm, 1000 ppm, and 1500 ppm). Growth parameters observed were (1) survival rate, (2) rooting percentage, (3) number of roots, (4) root length, (5) root fresh weight and dry weight (6) shoot fresh weight and dry weight (7) shoot-root ratio. Data was processed with analysis of variance then followed by fisher's LSD test. RESULT AND CONCLUSION Analysis of variance was conducted to explore the impact of all factors on growth parameters, shoot cutting was found to be the most significantly different related to each growth parameters observed; those were (1) survival rate, (2) rooting percentage, (3) number of roots, (4) root length, (5) root fresh weight and dry weight (6) shoot fresh weight and dry weight (7) shoot-root ratio , beside that, stem cuttings was not significantly different related to those growth parameters observed. Rooting percentage on shoot cuttings was 82% and stem cuttings was 0%. Plant growth regulator treatments were not significantly affected cuttings, because control (0 ppm) on shoot cuttings showed high rooting percentage value (77%), followed by 500 ppm (80%), 1500 ppm (83%), and 1000 ppm (87%). Interaction between source of materials and concentration of plant growth regulators was also not significantly related on each growth parameters observed because all of stem cutting could not survive during root primordial initiation, shoot cuttings was also not significantly different related to those growth parameters observed, because control (0 ppm) on shoot cuttings produced significant survival rate (77 %).
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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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