Judul: Respon Tanaman Padi terhadap Campuran Dolomit-Trass yang Dibakar 700 ℃ Dibandingkan dengan Trass, Terak Baja, dan Dolomit serta Kombinasinya pada Tanah Gambut Delta Berbak, Jambi
Abstrak: Application of ameliorant on peat soil is important to do for improvement the soil quality for supporting plant growth. The aims of this research is to compare paddy’s response on peat soil with applying 700℃ burned dolomite-trass mixture with trass, steel slag, dolomite and its combinations. This research use randomized complete design that included of control, 50% NPK, 5% steel slag, 5% trass, dolomite (2.5%, 1.9%, and 1.3%), 5% 700℃ burned dolomite/trass (0.5:1, 0.75:1, and 1:1), and 5% combination of steel slag and dolomite-trass 1:1 (25:75, 50:50, and 75:25). Each treatments is perfomed in three replications. The result showed that application the combination of steel slag and 700℃ burned dolomite-trass 1:1 (25:75) was better to increase soil pH, plant height, tiller, and dry weight of plant than the other treatments. Beside that, application the combination of steel slag and 700℃ burned dolomite-trass 1:1 (25:75) is also better to increase N, P, K, Ca, Mg, Fe, Cu, and Zn uptake and also to increase the RAE of N, P, and K than the others.
Keyword: Bogor Agricultural University (IPB), trass, steel slag, peat, plant’s response, Dolomite

Judul: Pemanfaatan Trass sebagai Pupuk Silika dan Pemberian Dolomit untuk Padi di Tanah Gambut dari Kumpeh, Jambi
Abstrak: High number of population in Indonesia demanding a high amount of rice production to fulfill the food needs as well. Changes of land use from agricultural to non-agricultural land, reducing the ability of rice production. Utilization of peat land for agriculture is an alternative to increase rice production. However, the use of peat land for agriculture will be faced with several constraints such as the low availability of macro and micro nutrients, including deficiency of Mg and Si. Peat soil parent materials derived from organic materials that have a low content of Si. In this study trass and dolomite is used as a source of Si and Mg. This study aimed to know the effect of trass and dolomite as source of Si and Mg on growth and uptake of Si and Mg by paddy, and change the chemical properties of peat. The trial was conducted in the greenhouse and Soil Chemistry and Fertility Laboratory at the Cikabayan Experiments Station and of Department of Soil Science and Land Resources, Faculty of Agriculture, IPB. This trial was done from February to July 2012. Factorial completely randomized design was used in this trial. Trass treatment consist of T0 (without Trass), T1 (2.5% w/w), T2 (5% w/w), T3 (7.5% w/w), whereas the dolomite treatment consist of D1 (1.6 ton/ha), D2 (4.8 tons/ha), D3 (8 tons/ha). The treatment is combination of these two factors resulting 12 combined treatment and 3 repeated in order to get 36 units of trial. Dolomite was significantly affect on plant height, while trass either singly or in combination with dolomite was not. Trass and dolomite singly and in combinations was significantly affect to the number of tillers. Highest plant height and tillers was about 50.1 cm and 10 achieved in T3D3. It was concluded that trass can be used as Si fertilizer. Mg uptake by paddy was increased with increasing doses of dolomite also for Si uptake with increasing of Trass dose. Change of Mg uptake from D1 to D2 and D2 to D3 was 0.26 g/pot and of 1.23 g/pot. Change of Si uptake by paddy from T0 to T1, T2, T3 were 0.34, 11.42 and 43.72 g SiO2/pot respectively. Dolomite was significantly increased of soil pH. Highest and lowest pH values is 5.55 and 4.10 obtained in the treatment T0D3 and T3D1. Dolomite was increased of exchangeable Mg in peat. Change a exchangeable of Mg from D1 to D2 and D3 is 2.29 and 13.76 me/100g respectively. Total of peat SiO2 was increased with increasing dose of Trass. Trass and Dolomite either singly or in combination was significantly affect on availability of SiO2 in peat. Highest available levels of SiO2 was obtained on T3D1 treatment about 61.50 ppm.
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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. ,,,
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular.