Judul: Isolation  and  Selection  of Endomycorrhizae  Fungi  and  the  Effect  on  Sorghum Growth and Yield
Abstrak: The main problem of phosphorus (P) manure added in the most soil in Indonesia is the low of mobility. Absorption of P in soil is very high, so the plant would suffer because of P deficiency. Recently, the farmers have problem with the cost and supply of P manure. Many efforts have been done, for instance by using biological manure with inoculation of Endomycorrhizae fungi. The Endomycorrhizae fungi has been reported that it could enhance the plant in uptaking phosphorus in the host. The aim of this research is to isolate and select the Endomycorrhizae fungi from the transmigration area Kuamang Kuning, Kabupaten Muara Bungo, Propinsi Jambi and its effect on sorghum growth and yield. This research has been done in Greenhouse of Department of Soil Science, Faculty of Agriculture, IPB. Isolation, Endomycorrhizae isolate purifYing, and measurement of several parameters were conducted in Soil Biology Laboratory, Faculty of Agriculture, IPB. This research has been carried out since Mei 2000 until June 2001.
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Judul: Response of sorghum [Sorghum bicolor (L.) Moench] genotypes to phosphorus fertilizer in different aluminum saturation Levels in Acid Soil.
Abstrak: Sorghum is one of high value commodity for food and energy security. Sorghum can solve food and energy crisis integratedly in one time and space. Sorghum also can increase productivity of marginal land because sorghum is a drought tolerant crop and suitable to be developed in Indonesia uplands. The major problem of uplands in Indonesia is predominance of acid soil with Al toxicity. The objective of this research was to obtain information about differential response of sorghum genotype tolerant and sensitive aluminum to phosphorus fertilizer in different aluminum saturation levels in acid soil. This research consisted of two stages, i.e: (1) evaluation of differential response of sorghum genotype tolerant and sensitive aluminum to phosphorus fertilizer in different aluminum saturation levels in acid soil, (2) evaluation of growth and development response of sorghum root to phosphorus fertilizer in different aluminum saturation levels in rhizotrone. Evaluation of differential response of sorghum genotype tolerant and sensitive aluminum to phosphorus fertilizer on different aluminum saturation levels in acid soil was conducted in split plot design in Tenjo, Jasinga. Rhizotrone research was conducted in split plot design in greenhouse at University Farm, IPB, Bogor. Aluminum saturation level as a main plot was 2 levels: high level of aluminum saturation (74.78%) and low level of aluminum saturation (25.51%). Four genotytpes were evaluated in this research as sub-plot: Numbu (tolerant), Kawali (tolerant), B-69 (sensitive), and B-75 (sensitive). Phosphorus fertilizer was given into 4 doses as main-plot : P-25%, P-50%, P- 75%, and P-100%. The results from stage one showed that there were different response of each genotype to phosphorus fertilizer in different aluminum saturation levels in acid soil. Numbu has highest value for each variable on this research. On high level of aluminum saturation, P fertilizer didn’t effect to almost variable on this research except sugar level of stem in B-69. On low level of aluminum saturation, P fertilizer effect penicle weight, grain per penicle weight, total weight, and stem weight in B-69. On rhizotrone research, P fertilizer effect root dry weight and root wet weight in B-69 on low level aluminum saturation.
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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