Judul: Pengaruh provenan dan waktu pemotongan pucuk terhadap jumlah dan pertumbuhan tunas lateral Mangium (Acacia mangium Willd)
Abstrak: The increase of Indonesian citizen is in horizontal comparison with the needs of pulp and paper basic materials. Based on this, the government through the Department of Forestry plans to develop Industrial Plant Forest (HTI) as wide as 5,8 million Ha until the end of 2009. But, it has not been realized which make the basic materials of pulp and paper can not be achieved. So, the best alternative is how the current HTI owners focus on the increase of the production by selecting wood types that can grow on unfertile land, fast growing species, and also have the qualities as pulp basic material. Mangium is one of the wood types which has been developed widely to fulfill the needs of paper basic materials because it has very good cellulose and hemicelullose contents. Beside that, it is also a fast growing species, and can grow on unfertile land. Even though it meets all the conditions, its fulfillness as pulp basic material is still considered low because the production can not be compared withpaper needs. Therefore, one of the alternatives to increase the production is by manipulating the growth since it is still a seed to produce two or more main stalks from a single tree. The most effective way is by cutting its leaf tip since it is still a seed. So a new stem will emerge from the side (armpit bud) which when it is mature it will have better qualities (diameter and height) compared with trees that has one main stalk. The purpose of this research is to find out the effects of the cutting of leaf tip and provenant to the forming of more than one main stalks. The research was conducted in Silviculture Lab for 3 months (December – March). Tools and materials that were used were polytube, scissors, hand spray, sprout tray, digital camera, PNG origin Group A Suaran Region KBUK F2 Origin Provenance, PNG origin Group b Suaran Region KBUK F2 Origin Provenance, QLD origin Group D Suaran Region KBUK F2 Origin Provenance, Parung Panjang Bogor BKPH origin, sand, dirt, hull charcoal, and compos. Work stage began by Mangium sprouting for two weeks which later on moving seed to polibag according to provenance treatments. Cutting stage was conducted after one month of moving seed to polybag (to cut the real leaf). Observation was conducted for 5 weeks after the cutting. The observed parameters were bud amount, bud growth speed, and total bud height. After the observation and various investigations analysis result it is known that cutting time treatment factor has real effects on the observed parameters (bud amount, bud growth speed, and total bud height). Based on Duncan further test results, it is known that the best cutting time treatment shown by the real leaf cutting time. The result conclude that produced average bud amount for real leaf cutting is 1,8 and fake cutting leaf is 1,08. While, bud growth speed parameter from the real leaf cutting treatment is divided by two, the first result of average of bud growth speed is 5 days and the
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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: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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