Judul: Jabon (anthocephalus cadamba (roxb.) Miq.) growth response in application of biopori hole infiltration on postmining area
Abstrak: Pertumbuhan jabon (Anthocephalus cadamba) pada lahan bekas tambang tidak optimal dikarenakan tanah masam dan unsur hara yang sangat rendah. Pengapuran dan Lubang Resapan Biopori merupakan upaya dalam peningkatan pertumbuhan jabon. Kapur dapat menetralkan asam dan Lubang Resapan Biobori (LRB) dapat memperluas permukaan tanah dalam meresapkan air hujan, selain itu serasah dalam LRB dapat menambah unsur hara. Tujuan penelitian ini yaitu meningkatkan pertumbuhan jabon melalui pembuatan LRB serta mengetahui jenis isian LRB yang terbaik dari daun tumbuhan LCC (Legume Cover Crops), daun akasia (Acacia mangium), atau sampah dapur organik. Daun LCC merupakan serasah isian terbaik berdasarkan variabel diameter karena memiliki rataan tertinggi dan berbeda nyata dengan perlakuan P2 (LRB berisi daun akasia) dan P0 (kontrol). Sampah dapur (P3) merupakan serasah isian LRB terbaik berdasarkan parameter tinggi karena berbeda nyata dengan kontrol (P0) dan memiliki rataan tertinggi., Growth of jabon (Anthocephalus cadamba) on postmining area is not optimal due to the acidic soil and nutrients are very low. Liming and Hole Infiltration of Biopori was an effort to improve Jabon growth. Lime can neutralize acid and Hole Infiltration of Biopori (LRB) can expand the ground to absorb water in the rain, in addition to the litter in the LRB can add nutrients. The purpose of this research is to improve jabon growth through making LRB and know the best of the LCC (Legume Cover Crops) plant leaves, leaf of Acacia mangium, or organic kitchen waste for LRB. Leaf litter stuffing LCC is best based on the variable diameter because it has the highest average and significantly different from treatment P2 (LRB containing acacia leaf) and P0 (control). Kitchen waste (P3) is the best litter LRB field parameters based high as significantly different from the control (P0) and has the highest average.
Keyword: jabon, pengapuran, lubang resapan biopori, daun LCC, sampah dapur

Judul: iRespon Pertumbuhan Tanaman Jabon (Anthocephalus cadamba (Roxb.) Miq.) Terhadap Pengapuran di Areal Bekas Tambang
Abstrak: The main problem of reclamation activities in the postmining land was marginal land that could not support the growth of plants, due to pH and the low level of nutrient. So that, the selection of local species which adaptable and the appropriate silviculture treatment was needed. Jabon (A. cadamba) is one of local tree species that had high prospect, because jabon classified into fast growing species, able to adapted various site conditions, and the silviculture treatment was relatively easy. Dolomit and gypsum were materials that contained of Ca (Calcium), which able being applied to increase the soil pH. This objectives research was to determine the effect of dolomit, crude gypsum and manure fertilizer on the growth of Jabon in postmining land at PT. Tunas Inti Abadi. The fertilizers treatment consisted of three treatments. There were 2 kg of manure fertilizer (N), 2 kg of manure fertilizer + 200 g of dolomit (KN), and 2 kg of manure fertilizer + gipsum 200 g (GN). The parameters that be measured were diameter, height, crown diameter, percentage of living. The combination of dolomit and manure fertilizear had significant effect on the 95% confidence interval the diameter of Jabon.
Keyword: reclamation, calcification, fertilizer, jabon

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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