Judul: Respon tanaman kedelai dan padi gogo terhadap limbah budi daya jamur tiram
Abstrak: The amount of mushroom cultivation waste increased in consequence of the increase of quality and capacity of business working on mushroom production. The accumulation of cultivation waste will cause environmental problem, if it is not handled properly. This research was aimed to evaluate the effect of oyster mushroom cultivation waste on nutrient uptake, plant growth, and yield of soybean and upland rice. The experiment was conducted using two factors of treatment. The first factor was waste of oyster mushroom cultivation that consist of 4 levels : 0 g/kg, 150 g/kg, 300 g/kg, and 450 g/kg of soil. The second factor was anorganik fertilizers consisting 3 level : 0%, 50%, and 100% of recommended doses. The upland rice variety Situbagendit was planted in pots and grown in the green house, while soybean number 44 was planted in pots and grown on the field condition. The treatmens of waste increase significantly the nutrients uptake, growth and yield of soybean and upland rice. The treatment of 300 g waste/kg soil in combination with 100% dose of anorganik fertilizers showed the best result in nutrient uptake. Anorganik fertilizers increase nutrient uptake in soybean, but contrarily in upland rice. The dose 300 g waste/kg of soil showed the best result in plant height, stem diameter, and number of node. While the dose of 450 g/kg showed the best result in number of leave, number of branch, and shoot dry weight of soybean. The mushroom cultivation waste also increase significantly the number of leave and rice seedlings. Combined with the mushroom cultivation waste, anorganik fertilizers had no significant affect on growth and yield of soybean and upland rice. The mushroom cultivation waste affect significantly the soybean yield that was indicated by the increase of pod number (up to 192%), number of seed (362%), seed weight (462%), and weight of 100 seeds (49%).
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Judul: Pemanfaatan Limbah Substrat Jamur Tiram dan Penambahan Sumber Nutrisi pada Budidaya Jamur Tiram Putih
Abstrak: Oyster mushroom or Pleurotus ostreatus (Jacq:Fr) Kummer is a type of wood-rot fungi commonly found in nature. White oyster mushroom has been widely marketed in the form of fresh or was processed like mushrooms chips. Substrates commonly used for the development of oyster mushroom cultivation is sawdust of Falcata. The more number of oyster mushroom cultivation gave the more waste of its substrate, while this waste still has nutrients that can be re-used for the cultivation of oyster mushroom. The objective of this study was to study the effect of the use of waste oyster mushroom substrate and liquid organic fertilizer to the growth and yield of oyster mushroom cultivation. Stages in this research consisted of substrate creation, seeding or inoculation, caring and observation of fungal development, and chemical composition analysis. The observations were the growth during the vegetative phase and reproductive phase, the character of the fruit body morphology, and the chemical composition analysis results of oyster mushroom fruiting bodies. The composition media of 75% spent mushroom substrate mixed with 25% of new mushroom substrate gave the best result on growth and mushroom yields. Concentration of 0.2% and 0.5% liquid organic fertilizer gave best yields. Besides the media and genetic factors, environmental factors such as temperature, humidity, and light affected the growth and yield of oyster mushroom.
Keyword: Pleurotus, oyster mushroom, mushroom substrate, mushroom cultivation, liquid organic fertilizer, Bogor Agricultural University (IPB)

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