Judul: Pengaruh Penyimpanan dengan Metode Bangun Piramida terhadap Daya Berkecambah Benih Tumbuhan Obat Saga Pohon (Adenanthera pavonina L.)
Abstrak: Red sandalwood is usefull medical plant, the bark can be used as an anti bacterial medicine (for injury), can be processed into milk, used as materials for making jewelry, and other things. Although research for red sandalwood could be found in abundance there were limited on its seed strorage, due to that situation the studies about storage effect using pyramid shape method of red sandalwood needs to be done. The study was aimed to determine the effect of storage in the pyramid shape method to germination percentage of the seeds of medicinal plants Red sandalwood (Adenanthera pavonina L.). The research method consisted of two phases of activity, namely: (1) The stages of storage, including preparation of seed and seed storage, (2) stage of germination, including pre-germination, seed germination, treatment, and observation. Observed variable was the germination percentage. Experimental design that used was completely randomized factorial design consisted of 6 storing methods factor and 3 storing durations factor. Data were analyzed using the F test followed by Duncan test. The results showed that storage methods factor was significantly affected the germination of seeds; storage durations was very significantly affected the germination of seeds, whereas the interaction of methods and storage durations did not significantly affected the red sandalwood (A. pavonina) germination. The method of the lowest to the highest germination are: the pyramid without surface that has 13.33% of germination percentage, paper surface pyramid (paper pyramid) that has 13.67%, paper pyramid surface with holes/ventilation (ventilation pyramid ) that has 17.67%, kaolin-gypsum pyramid surface (kaolin-gypsum pyramid) that has 20.33%, silver paper pyramid surface that has a reflection (mirror pyramid) that has the 22.00 %. From the analysis of storage duration on the germination percentage showed that seeds planted immediately (0 week) have the lowest average of germinating which has 3.33% of germination, then the largest value is generated by 2 weeks storage duration which has 28.67% of germination, the germination decreased in the storage duration of 4 weeks which has 23% of germination. Storage methods factor was significantly affected the germination and storage durations was very significantly affect the seeds germination of red sandalwood (A. pavonina). The pyramid shape methods were not suitable for red sandalwood storage, the best results for storage duration factors was 2 weeks duration with the 28.67% of germination.
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Judul: Pengaruh Pematahan Dormansi Terhadap Kemampuan Perkecambahan Benih Angsana (Pterocarpus Indicus Will)
Abstrak: INTRODUCTION. So far, Seedling production of Angsana (Pterocarpus indicus Will) is done by stem cutting. Seedling propagation by seeds is not done widely, as well as its silvicultural system is still not known yet. Seed germination percentage is affected strongly by seed quality (physic, genetic and physiology). The main problem of seed germination of Angsana seeds is seed coat dormancy; therefore it is important to study the breaking dormancy techniques of Angsana seeds. The aim of this research was to study the effects of breaking dormancy treatment to the germination capacity of Angsana seeds. MATERIAL AND METHOD. This research was done from 30 June to 28 Agust 2008 at Green House, the Laboratory of Silviculture, Faculty of Forestry, Bogor Agricultural University. The material and equipment used in this experiment consisted of Angsana seeds, hot water, H2SO4, KNO3, water from fermented bamboo shoots (Gigantochloa apus Kurz), rice hull charcoal, subsoil, germination boxes, soaking bath, watering equipment, analytical balance, stationary, ruler, calliper, and digital camera. The research procedures consisted of several steps; those were seed extraction and selection, seed water content measurement, breaking dormancy treatments, germination, maintenance, observation, and data collection and analysis. The experimental design in this research was completely randomised design which consisted of 6 soaking treatments, those were soaking in hot water for 30 minutes followed by soaking in cold water for 12 hours (B0), soaking in the fermented bamboo shoot liquid for 12 hours (B1), soaking in H2SO4 1% for 10 minutes (B2), soaking in H2SO4 1 % for 15 minutes (B3), soaking in KNO3 1 % for 12 hours (B4) and soaking in KNO3 for 24 hours (B5). Each experiment unit was replicated in three replicates. The observed parameters consisted of germination capacity, germination value, speed of germination, germination rate, germination time at 80%, high and diameter of transplanted seedlings. The collected data was analysed using F test followed by Duncan Multiple Range Test (DMRT). RESULTS AND CONCLUSSION. Angsana seeds had embryonic and seed coat dormancies. Based the results of F test and Duncan test showed that soaking in H2SO4 1% for 10 minutes and in KNO3 1 % for 24 hours could break those dormancies. It was indicated by it high germination percentage (100 %), and other values such as germination value (1,13% to 1.05% normal germinants/day2), germination speed (1, 41 %/day), germination rate (19,32 – 18,59 day), germination time at 80% (25 day), seedlings height (1,53 cm) , and diameter growth (1,06 mm to 1,1 mm) respectively. Key word: Angsana, Pterocarpus indicus Will, Dormancy.
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Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular