Judul: Aplikasi zat pengatur tumbuh untuk menyerempakkan mekar bunga dan masak buah jarak pagar (Jatropha curcas L.)
Abstrak: One of the major constraints in Jatropha oil production is asynchronous fruit ripening, hence harvesting needs to be carried out accordingly which lead to drudgery. Therefore, an experimental study on the use of plant growth regulators was designed to induce synchronous blooming of pistilate flowers, and to promote synchronous fruits ripening. The study was conducted at the Jatropha Plantation of PT Indocement Tunggal Prakarsa Tbk Citeureup from October 2009 to August 2010. To induce synchronous blooming of pistilate flowers, Benzyl Amino Purine (BAP) and etephon were used, whereas etephon alone was used to promote synchronous fruits ripening. A completely randomized design was used in the first experiment that was carried in two steps. In the first step BAP at 0, 30, 35, 40, 45, 50 ppm and etephon at 10, 30, 50, 70 and 90 ppm were applied on early developing flower buds. In the second step 0, 30, 50, 70, 90 and 110 ppm BAP were used. The second experiment consisted of three steps. The first step was observation of seed development from 30 days after anthesis. A randomized complete block design was used in the second and the third steps. In the first step 0, 200, 400, 600, 800, 1000, and 1200 ppm of etephon were applied on fruits at 40 and 45 days after anthesis during the rainy season. In the second stage 0, 100, 200, 300, 400 ppm etephon were applied on fruits of the same maturation stages in the dry season. The result show that BAP tends to increase the number of female flowers in an inflorescence thus longer period of blooming. Application of etephon at 200 ppm on 40 day after anthesis shorten the fruit maturation hence more synchronous fruit ripening in rainy season, but not in dry season when fruits ripened synchronously. The quality of the seed and kernel were not affected by etephon application.
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Judul: Optimalisasi Pertumbuhan dan Produktivitas Jarak Pagar (Jatropha curcas L.) Melalui Aplikasi Pemupukan.
Abstrak: The study was conducted to determine the effect of fertilizer application (dose and time) on the growth and productivity of jatropha. Research conducted at PT. Indocement, Citeureup, Bogor regency in October 2010 - July 2011. This research using randomized complete block design (RCBD) two factors. The first factor is the dose of fertilizer, which consists of five levels, namely 0, 24, 36, 48, and 60 g / plant. The second factor is the time of fertilization, namely 2 and 14 week after transplanting (WAT). Type of fertilizer used is NPK fertilizer, with a ratio of 15:15:15. Data obtained from observations processed using various analysis (ANOVA). Observations made in the vegetative phase of growth (plant height, leaf number, number of branches, and trunk diameter) and the generative phase (the number of productive branches, number of panicles, number of fruits, fruit weight, seed number and seed dry weight). Most of the dose of fertilization no significant effect on plant growth vegetative phase, except in the number of primary branches in 12 WAT. Significantly affect the dose of fertilization treatment increased the number of fruit and branches of productive. In general, from several observation variables (plant height, stem diameter, number of fruit, and productive branch) 48g/tanaman dose treatment tended to give better results. Fertilizer at 14 WAT is more effective, because it can have any number of fruit, fruit weight, seed number and seed dry weights were markedly higher than the 2 WAT treatment.
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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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