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: Peningkatan pertumbuhan dan hasil panen beberapa tanaman sayuran daun melalui aplikasi pupuk kandang berfortifikasi.
Abstrak: The objective of this research was to study the effect of fortified animal manure application on growth and yield of several leafy vegetables, such as: kangkong (Ipomoea aquatica F.), caisin (Brassica rapa L.), and lettuce (Lactuca sativa L.). This research was conducted at Cikabayan Farm Unit, University Farm, IPB Darmaga Bogor from Februari to August, 2012. Six treatments (chicken manure, fortified chicken manure, goat manure, fortified goat manure, cow manure, fortified cow manure) were arranged in Randomized Complete Block Design with four replication for each vegetables as a single unit experiment. Chicken manure application produced higher yield. Chicken manure application produced 4.88 ton ha-1 kangkong, 9.60 ton ha-1 caisin, and 2.24 ton ha-1 lettuce. Moreover, the application of fortified animal manure increased kangkong yield up to 20% weight per plant, 17.78% marketable plant weight per bed and 19.76% root weight per plant.
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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