Judul: Utilization of empty fruit bunches and bunch ash oil palm as ameliorant on oil palm (Elaeis guineensis Jacq) seedling growth in main nursery
Abstrak: The objective of the research was to identify the effect of ameliorant to the oil palm seedling growing in main nursery. This experiment was conducted at IPB Experimental Station Cikabayan (Plantation Teaching Farm), Dramaga, Bogor in 250 m above sea level, from November 2011 to May 2012. The experiment was arranged in a randomized block design with seven treatments and six replications. The treatment consist of P1 : Urea 22 g, SP36 15 g and KCl 17,5 g per seedling. P2 : Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg empty fruit bunches per seedling. P3 : Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg bunch ash per seedling, P4: Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg empty fruit bunches + 1kg bunch ash per seedling, P5:1 kg empty fruit bunches + 1 kg bunch ash per seedling, P6:1 kg empty fruit bunches per seedling and, P7:1 kg bunch ash per seedling. The result of the experiment showed that the treatment of P1 : Urea 22 g, SP36 15 g and KCl 17,5 g. P2 : Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg empty fruit bunches. P3 : Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg bunch ash, P4: Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg empty fruit bunches + 1 kg bunch ash having the same affect to the vegetative growth as height respectively, 90,16 cm, 88,03 cm, 87,90 cm and 89,68 cm. The treatment of doses of P4: Urea 11 g, SP36 7,5 g and KCl 8,5 g + 1 kg empty fruit bunches + 1 kg bunch ash, affected to the plant dry weight, roots dry weight respectively 32 % and 36,61 % compare to P1, P2, P3, P5, P6 and P7.
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Judul: Optimizing of fertilizer nitrogen and phosphorus doses for oil palm seedling (Elaeis guineensis Jacq.) in Main Nursery
Abstrak: The objective of this experiment was to study the optimum doses fertilizer of Nitrogen and Phosphorus for oil palm seedling (Elaeis guineensis Jacq.) in main nursery. This experiment was carried out at IPB Experimental Station (Plantation Teaching Farm),Cikabayan Dramaga, Bogor, from November 2011 to May 2012. The treatment was laid-out in a factorial randomized block design with three replications. The first factor was N i.e. 0, 8.51, 17.02, and 34.04 g N.plant-1 and the second was P i.e. 0, 2.28, 4.56 and 9.12 g P.plant-1. The result of the experiment showed that vegetative growth increased with fertilizer application. The height and leaf area of plant are affected by interaction between N and P significantly. The total leaf number and steam diameter increased quadratically with fertilizer rate of N and application of P increased linearly. Base on the height of plant and leaf number, optimum recommendation rate of N for oil palm seedling during six months in main nursery is 21.99 g N plant-1, by aplication every month i.e. 1.60, 1.14, 2.80, 4.01, 5.73 and 5.74 g N plant-1.month-1. Optimum recommendation rate of P is 4.24 g P plant-1 by aplication every month i.e. 0.22, 0.44, 0.76, 0.18, 0.94, and 1.70 g P.plant-1.month-1. The seedlings that resulted from experiment could be requisite accomplished to used on commercial planting.
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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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