Judul: Pengaruh Pupuk Daun Organik terhadap Peningkatan Pertumbuhan Bibit Jabon (Anthocephalus cadamba Roxb. Miq.)
Abstrak: Jabon with good quality can be gained by adding nutrient to plant through fertilizer. This research aims to increase the growth of jabon through the application of X organic leaf fertilizer. The research was conducted in greenhouse with using the randomized complete design (RAL). X organic leaf fertilizer applied to jabon seeds every 2 weeks during the 16 weeks. The variables are height, diameter, fresh weight of shoot and root, dry weight of shoot and root, length of root, root shoot ratio and seed quality index. The results showed that 3 variables out of 9 variables are significantly affected to the growth of jabon seeds, such as height, fresh weight and dry weight of shoot. The application of X organic leaf fertilizer with 0.4% concentration can increase 10.62 cm height of jabon seeds (20.14%), 8.24 grams fresh weight of shoot (66.1%) and 1.26 grams dry weight of shoot (72.60%).
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Judul: Pupuk Organik untuk Pertumbuhan Bibit Jabon (Anthocephalus cadamba miq.) dan Ketahanannya Terhadap Penyakit
Abstrak: Wood supplied from natural forests decreasing and marginal land increasing and requires the development of both timber plantations and community forest. This is done in order to meet the increasing demand for wood commodities. Jabon tree (Anthocepalus cadamba Miq.) has good prospects because of relatively fast-growing trees in a variety of soil types. Jabon wood has pretty good marketing prospects with silviculture techniques that are relatively easy. The use of inorganic fertilizers continuously tends to destroy soil, soil structure and soil fertility. Therefore the use of liquid organic fertilizer is a solution to keep the fertility of the soil, even though used continuously. The purpose of this study was to determine the effect of application of organic manure (POC) with different doses for growth of the seedlings in the nursery jabon and to determine its effect on resistance to disease of Jabon seedlings in the nursery. As the treatment was liquid organic fertilizer which is used to seedlings Jabon consisting of a controls that is not fertilized (A), POC with a dose of 0.5 mL 100 mL-1 water or concentration of 0.5%, with the number 20 mL tan-1 (B), POC with a dose of 0.75 mL 100 mL-1 water or concentration of 0.75%, with the amount of 20 mL of tan-1 (C), and 250 grams of manure tan-1 (D). Fertilization is divided into 3 (three) parts, namely the roots, stems and leaves. The result showed that the liquid organic fertilizer with a concentration of 0.5% was the best compared to other concentration with high accretion at 13.38 cm and a diameter of accretion 2.94 cm. The use of liquid organic fertilizer with a concentration of 0.5% was optimal for seedling resistance to disease Jabon spots on the leaves, which are resistant or damage rate 2.56%.
Keyword: Organic Fertilizer, Disease, Anthocephalus cadamba

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf