Judul: Sago (Metroxylon spp.) Propagation with Ex vitro (Polybag and Raft seedlings) and In vitro through Tissue Culture
Abstrak: Present studies were carried out to determine the effect of auxin, weight of sucker, on root induction and growth variables in nursery of sago seedlings. The research were used Darmaga accession (spineless). For this purpose some parameters were studied after treating suckers with some auxin concentrations, i.e. control (without growth regulators/ 0 mM), 7.40 mM naphthalene acetic acid (NAA), 7.40 mM indole butyric acid (IBA), and 7.40 mM commercial auxin, and weight of sucker i.e 500-999 g, 1 000-1 499 g, and 1 500-2 000 g, with polybag and raft nursery. The treatments were applied by one method (quick dip) and the treated suckers were submerged 30 minutes in pesticides before. This research was conducted at Cikarawang, Dramaga, Bogor, West Java and Physiology and Chromatoghraphy Laboratory, Department of Agronomy and Horticulture, Bogor Agricultural University, from July 2012 to Mart 2013. The result from polybag nursery showed that suckers weight 1 000-1 499 g and 1 500-2 000 g were not significantly different on polibag nursery. The result of without auxin, IBA, NAA, and commercial auxin treatments for survival rate were 52%, 70%, 62%, 53% respectively. Increasing percentage of starch content in line with the increasing weight of sucker. On the raft nursery,treatment of NAA showed significantly inhibit seedling growth, as indicated by reduction the 1st rachis height and amount of 1st rachis leaflets compare with kontrol and commercial auxin. Treatments of auxin did not give significantly different on some variables (number of primary roots, number of aerenchym roots, and the length of root. Survival rate percentage of seedlings were obtained 65% (for both weight sucker 1 000 – 1 499 g and 1 500-2 000 g) on 4 month after nursery (MAN), while the sucker weights 500-999 g produced survival rate percentage is lower than 40%. Either polybag and raft nurseries, showed that there were significantly different to height of abnormal rachis, number of leaflets of abnormal rachis, number of leaflets of 1st rachis, diameter of 1st rachis, number of primary roots, and aerenchyma roots. Both of nursery techniques were not significantly different on percentage of survival rate seedlings. Rachis diameter in raft nursery was significantly higher than in polybag nursery, 5.9 cm and 1.2 cm respectively. The number of primary roots at polybag higher than at raft nursery.Combination treatments of without auxin and suckerr weight 500-999 g has a number of primary roots 5.5 at polibag nursery and 0.13 at raft nursery. Combination treatments of 7.04 mM IBA, without auxin auxin and suckerr weight 1000-1499 g have a number of primary roots 9.6 and 18.2 at polibag nursery and 0.19 and 0.73 at raft nursery, respectively. Combination treatments of without auxin, 7.04 mM IBA, 7.04 AK and suckerr weight 1500-2000 g have a number of primary roots 7.6, 6.8, and 8.8 at polibag nursery and 0.31, 0.29, dan 0.33 at raft nursery, respectively.But, a number of aerenchyma roots at raft nursery were higher than at polybag nursery i.e. 7.08 dan 1, respectively. In vitro culture for sago palm from shoot tip and young leaf explants were conducted. This study was carried
Keyword: root induction, primary roots, aerenchyma roots, sucker, auxin

Judul: Pengelolaan sagu (Metroxylon spp.) Di PT. National Sago Prima, Selat Panjang, Riau dengan aspek khusus pengaruh bobot bibit dan penggunaan pupuk organik cair terhadap pertumbuhan bibit sistem polibag di pembibitan
Abstrak: The objective of this study was to obtain some informations about sago palm cultivation especially in nursery and know the effect of sucker weight and liquid manure application to the vegetative growth of sago sucker at polybag nursery system. This experiment held in PT. National Sago Prima, Selat Panjang, Riau from February to June 2011. The primary data were found by direct methods, it included the following activities in cultivation of sago palm, and did experiment in the field. The secondary data were found by indirect method, interviewed and discussed with the company staff and study literature to get more informations. The special aspect was find by arranged in split plot design, where the main plot was sucker weight with three levels (50-200 g, 200-500 g, and 500-800 g) and the subplot was four levels of liquid manure application (0, 2, 5, and 8 ml/l) with three replications. The results showed that there was no significantly different in the vegetative growth of sucker by liquid manure application. The sucker weight treatment showed significantly different to survival rate, leaf length, number of leaves, and percentage of expanded leaves. The larger suckers produced higher of leaf length. However, larger suckers didn’t always produce higher percentage of expanded leaves and higher survival rate of suckers in comparison to smaller ones. The sucker weight 200-500 g was the best sucker size to the vegetative growth of suckers
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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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