Judul: Produksi Biomassa dan Minyak Atsiri Kemangi (Ocimum basilicum L.) pada Berbagai Dosis Pupuk Nitrogen dan Pupuk Cair Hayati
Abstrak: Basil (Ocimum basilicum L.) is one of essential oil producers. Essential oil price has still fluctuated, one of the reasons is because of the cultivation is inappropriate yet. The research was conducted to study find the best rate of nitrogen fertilizer and the impact of biological liquid fertilizer to the essential oil production of basil plants. The research was arranged in Randomized Complete Block Design Split Plot with two factors, first factor was three levels of nitrogen rate; 0, 22.5, and 45 kg ha-1 and the second factor was two levels of biological liquid fertilizer rate; 0 and 2 l ha-1 for three replications of each treatment. Interaction of nitrogen rate and biological liquid were not impacted the yield and essential oil production. Nitrogen was increasing the number of branches, flowers, and leaves length variables with the optimum rate about 23.40–28.35 kg ha-1. Nitrogen rate of 22.5 kg ha-1 has a higher economic value on the basil of essential oil production. Biological liquid fertilizer was increased the height and number of basil leaves variables, but it was not impacted the yield and essential oil of basil.
Keyword: branches, distillation, fertilization, yield

Judul: Produktivitas Bahan Segar Dan Kadar Minyak Atsiri Tanaman Nilam (Pogostemon CABLIN Benth) Pada Berbagai Dosis Pupuk Nitrogen Dan Umur Pangkas
Abstrak: This research gowes to study the influence of various dosages nitrogen fertilizer and the days of prune against the production of fresh and patchouli essential oils. These experiment used Randomized Complete Block Design, two factors and three replications. The first factor is the dose of nitrogen derived from Urea fertilizer consisting of 0, 45, 90 and 135 kg N/ha. The second factor is the age prunning consisting of 60, 75 and 90 days after planting (DAP). The objective of experiment was conducted in IPB Experimental Station, Leuwikopo, Dramaga, Bogor in February to July 2011. Planting material used is 2 months old. The seedling of patchouli varieties derived from breeding Sidikalang Balittro Research, Cimanggu. The seedling were planted in the field with a spacing of 50 cm x 50 cm. Trials nitrogen fertilization is carried out twice, i.e. half dose of treatment in the planting and the rest is given 60 days after planting. The results showed that the height of the plant, the number of branches, the number of leaves, weights wet and dry weight highest harvest produced by the plant, which fostered 90 kg N/ha. The nitrogen fertilizer not affect leaf area index, while the highest levels of the oil produced by the plant without fertilizer nitrogen. The age of the real impact of the trim height, number of branches and leaves of patchouli plants. But the age of prune not affect the leaf area index, weights wet and dry weight of the harvest. The age of prune 90 HST producing plants with tall 62.2 cm or an average 7.9 % higher than the age of prune other, the number of branches 50.4 or an average 7.7 % higher than the age of prune other, and the number of strands of 170.2 leaves or average 7.8 % more than the age prune other. Highest patchouli oil content is at the age of prune 75 HST without a nitrogen fertilizer that is 2.19 %.
Keyword: 

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