Judul: Effect of Height and Harvest Age of Patchouli (Pogostemon cablin Benth.) Ratoon on Growth and Production of Patchouli Oil
Abstrak: Indonesia menguasai sekitar 95% pasar minyak nilam dunia dengan volume ekspor 1.200 – 1.500 ton/tahun. Perkembangan zaman menyebabkan kebutuhan minyak nilam meningkat, sehingga perlu adanya teknik budidaya untuk memaksimalkan hasil produksi minyak nilam diantaranya yaitu dengan memperhatikan cara dan umur panen tanaman nilam ratun. Penelitian bertujuan menganalisis pengaruh tinggi dan umur panen terhadap pertumbuhan dan produksi minyak nilam ratun. Penelitian dimulai dari bulan Januari sampai Juli 2023 di Desa Padahurip, Kabupaten Kuningan. Rancangan percobaan menggunakan Rancangan Split-Blok dengan 2 faktor dan 3 ulangan. Faktor pertama tinggi panen (10 cm, 20 cm, 30 cm di atas permukaan tanah) dan faktor kedua umur panen (2 bulan setelah panen (BSP), 3 BSP, 4 BSP). Perlakuan tinggi panen 10 cm menghasilkan bobot dan rendemen minyak yang paling tinggi pada panen tanaman baru. Perlakuan tinggi panen 30 cm pada umur panen 4 BSP menunjukkan nilai rata-rata yang tinggi pada hampir semua variabel pertumbuhan tanaman nilam ratun kedua yang diamati. Hasil panen nilam ratun pertama menunjukkan bahwa bobot minyak paling tinggi yaitu pada interaksi perlakuan tinggi panen 20 cm dan umur panen 4 BSP dengan nilai 0,40 gram/tanaman. Hasil rendemen minyak paling tinggi yaitu pada perlakuan tinggi panen 30 cm dan pada perlakuan umur panen 4 BSP dengan nilai masing-masing yaitu 1,35% dan 1,55% dari bobot kering., Indonesia controls about 95% of the world patchouli oil market with an export volume of 1,200 - 1,500 tons/year. The development of the times causes the need for patchouli oil to increase, so it is necessary to have cultivation techniques to maximize the production of patchouli oil, including by paying attention to the method and age of harvest ratoon patchouli plants. The study aims to analyze the effect of harvest height and age on the growth and oil production of ratoon patchouli. The research began from January to July 2023 in Padahurip Village, Kuningan Regency. The experimental design used a Split-Block Design with 2 factors and 3 replications. The first factor is harvest height (10 cm, 20 cm, 30 cm above ground level) and the second factor is harvest rotation (2 months after harvest (MAH), 3 MAH, 4 MAH). The 10 cm harvest height treatment produced the highest weight and oil yield in the first harvest. The 30 cm harvest height treatment at harvest age 4 MAH showed high average values in almost all of the observed growth variables of the second ratoon patchouli plant. The results of the first ratoon patchouli harvest showed that the highest oil weight was in the interaction of the 20 cm harvest height treatment and the harvest age of 4 MAH with a value of 0.40 grams / plant. The highest oil yield was in the 30 cm harvest height treatment and the 4 MAH harvest age treatment with the respective values of 1.35% and 1.55% of dry weight.
Keyword: leaf proportion, number of shoots, oil weight, oil 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 %.
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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