Judul: Pengaruh jumlah daun bibit tanaman sagu (Metroxylon sp) terhadap pertumbuhan awal di lapangan
Abstrak: The experiment was did to know the effect of number leaves on sago palm seeedling after nurserry for the early growth on the field. The experiment was did 3 month (observation) and 2 month preparing the experiment, starting of februari 2012 until juni 2012. The experiment located on PT. National Sago Prima. Selat Panjang, Riau. The treatment were arranged in completely randomized design. The treatment investigated were the use of seedling at one leaves, two, three or more than (control), and without leave with six replication. The sample taken from each replication, ten sample for each treatmen in replication. The seedling were planted on the hole with size 40 cm x 40 cm x 40 cm. The result show that the trearment had a significant effect on additional leave, length and width leafe in the new leave (1 and 3), and for ecah variable on the new leave number 4. The treatment had a significant effect on the optimum condition for growth (appearance new leave). The treatment two leave had not significant effect with control treatment. The treatment without leave had lowest value than the other. The positif respons had showing from the treatment two leave on increasing leave, and percentage of life on the field. The highest precentage of life has showing from the treatment two leave with 65% and the lowest showing from the treatment without leave with 15 %.
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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: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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