Judul: Respon Pemangkasan dan Kemampuan Perakaran Stek Pucuk Jabon (Anthocephalus cadamba (Roxb.) Miq) dan Longkida (Nauclea orientalis (L.) L.)
Abstrak: Jabon (A. cadamba (Roxb.) Miq) and Longkida (N. orientalis (L.) L.) are fast growing species. Jabon marketing prospects are quite good, but with a small seedling size and are not available throughout the year this makes the availability of seedling jabon limited, so that can not fullfill the market. Longkida can be used as to rehabilitate flooded land, but with the availability of seed that has not been much, so the seedlings longkida still difficult to obtain. One attempt that can be done is by vegetative propagation through cuttings shoots technique. A good cutting material is usually derived from plus trees. Which can be propagated via seeds or vegetative materials. This study aimed to determine the response of seedlings jabon and longkida aimed due to pruning on some types of seedling size on shoots, shoots growth, and the ability of seedlings to survive and also to know the effect of seed size factor and hormone treatment (ZPT) to the successful growing shoot cutting of jabon and longkida . The study was conducted in the SEAMEO BIOTROP nursery, for approximately 2 (two) months, starting from July to August 2011. Materials used were the seedling jabon and longkida with height of 5–15 cm, 15–25 cm, and 25–35 cm. In the hedged orchard, research was arranged in Completely Randomized Design with seed size as a treatment (R1, R2, R3). Research on shoot cuttings was arranged in Completely Randomized Factorial in Design with two factors, namely factors of seed size (P1, P2, P3) and the treatment of hormonal factors (H0, H1). The variables observed in the research on shoot cuttings that are percentage of live shoots, the percentage of rooted cuttings, cuttings sprouting percentage, average length of roots, and root dry weight. Research on hedged orchard, observed variables such as the percentage of fresh cutting, number of shoots, and the average length of shoots. The final observation of hedged orchard research, for hedged orchard jabon with size 15-25 cm (R2), and 25-35 cm (R3), and hedged orchard longkida with size 25-35 cm (R3) got the highest score of number shoots, while in variable of lenght shoots, with size 15-25 cm (R2), and 25-35 cm (R3) showed the highest value of length shoots of hedged orchard longkida, for all size seedling of hedged orchard jabon showed value not different significantly. The research of shoot cutting, seedling size factor and hormonal treatment factor showed negative effect significantly on the length root of jabon shoot cutting variable while root dry weight parameters in both types of plants, only influenced positively on seedling with size 25-35 cm (P3). Thus some seedling with size 15 cm to 35 cm have a potential in jabon and longkida hedged orchard development. Seed size and hormonal treatment showed no effect on the jabon and longkida shoot cutting success
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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: Best Difference Equation Aproximation to Duffing 's Equation
Abstrak: Persamaan Duffing merupakan persamaan yang sering muncul sebagai model masalah sistem ayun mekanis atau pada masalah rangkaian listrik. Umumnya penyelesaian persamaan ini secara numerik memberikan hampiran dengan gala! yang tinggi, seperti dengan metode Runge-Kutta. Tulisan ini mengkonstruksi suatu persamaan beda untuk menghampiri persamaan Duffing tersebut. Penyelesaian dari persamaan beda ini melibatkan fungsi-fungsi eliptik Jacobi. Berdasarkan penyelesaian ini diperoleh basil bahwa penyelesaian hampirannya persis sama dengan penyelesaian analitiknya. Penyelesaian analitik yang diperolehjuga melibalkan fungsi-fungsi eliptik Jacobi.
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