Judul: Respon Padi Terhadap Campuran Dolomit Dibakar 550 oC-Trass Dibandingakan dengan Trass, Terak Baja, dan Dolomit serta Kombinasinya pada Delta Berbak, Jambi
Abstrak: One of the obstacles to agriculture development in peatlands is high organic acids. Ameliorant is required for peatland farm to increase soil pH and improve nutrient availability for plants. The purpose of this research is to investigate responses of paddy on peat soil with application of 550 ℃ burned dolomite and trass compare trass, steel slag, dolomite, and its combinations. This research used random complete design, 13 treatments with three replications consisting of control, NPK 50% of the dose recommendation, 5% steel slag, 5% trass, dolomite (2.5%, 1.9%, and 1.3%), 5% dolomite 550 ℃-trass (0.5:1, 0.75:1, and 1:1), and 5% combination of steel slag and burnt dolomite 550 oC-trass 1:1 (25%:75%, 50%:50%, and 75%:25%). The results of this research showed that trass or dolomite was a single application not effective as a peat soil ameliorant for paddy. However when trass was combined with burned dolomite 550 oC it is effective as ameliorant peat for paddy. Applications of burned dolomite 550 oC-trass mixture was better than trass, dolomite and steel slag only as ameliorant peat for paddy. Applications of burned dolomite 550 oC-trass combined with steel slag was better than the application of burned dolomite 550 oC-trass mixture without steel slag as ameliorant deep peat for paddy. The combination of trass-burned dolomite 550 oC with steel slag (75%: 25%) was the best ameliorant on the deep peat for paddy.
Keyword: Bogor Agricultural University (IPB), trass, steel slag, paddy, peat, dolomite

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: 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