Judul: Pengaruh Pupuk Kandang dan NPK pada Tanaman Suweg, Talas, dan Iles-Iles
Abstrak: Tuber crops play important role in food security status in Indonesia. In order to increase productivity, study was conducted on suweg, taro, and iles-iles treated with manure and NPK fertilizers. Research was carried out in Cikabayan, University Farm of IPB from December 2009 to July 2010. Tubers were planted under 50% shading net. Split plot design with two factors was used in this reseach. Goat manure with three levels, i.e., 0 ton/ha, 5 ton/ha, dan 10 ton/ha was determined as main plot. As subplot, NPK fertilizers, was applied at four levels, i.e., zero, 100:60:80 kg/ha, 125:60:100 kg/ha, and 150:60:120 kg/ha. The results showed that there was interaction between manure and NPK on leaf number, petiole height, petiole diameter, and fresh mass of suweg. Aplication of 10 tons/ha of manure without NPK produced the highest fresh mass of suweg corm. Interaction was significant for leaf number and petiol height of taro and iles-iles, and petiol diameter and rachis length of iles-iles. There was not interaction between manure and NPK fertilizer for fresh mass corm of both taro and iles-iles.
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Judul: Pemupukan tanaman  Suweg (amorphophallus paeoniifolius (dennst.) Nicolson)  Dan iles-iles (amorphophallus muelleri blume.)  Pada sistem tumpangsari
Abstrak: Suweg (Amorphophallus paeoniifolius (Dennst.) Nicolson) and iles-iles (Amorphophallus muelleri Blume.) are shade-tolerant plants and generally cultivated under the tree stands. This study aimed to develop a fertilizer application technology for suweg and Iles-iles in intercropping systems. The study was conducted using randomized block design (RBD) using two the species suweg and iles-iles. Method of application of fertilizer with three level (sidedressing, soil spray and control). The study was conducted from June 2011 to May 2012 at the University Farm, Bogor Agricultural University, Leuwikopo, Bogor. The results indicated that fertilizer aplication gave a significant effect on parameters on suweg observation. Spread techniques gave the highest yield on yield tuber dry weight of 221 g, fresh weight of tuber 1152 g, yield weight total around 28 tons / ha, tuber diameter 8.05 cm, and 13.00 cm tuber tall. The results indicated that fertilizer on Iles-iles only gave a significant effect on plant height parameters with the highest yield on control that reached 72 cm.
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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