Judul: Pengelolaan Perkebunan Sagu (Metroxylon Sago Rottb.) Di PT. National Sago Prima, Selat Panjang, Riau Dengan Aspek Khusus Pengambilan Sampel Pelepah
Abstrak: The objective of this study was investigated representative leaf sampling for predicting the sago nutritional status. Investigation used regression method that comparing three frond that have bigest regresion. The regresion is relationship between leaflet length and nutrient level of each leaflet. The soil nutrient analyisis was conducted to support best desicion for sampling recomendation. This experiment held in PT. National Sago Prima, Selat Panjang, Riau from February to June 2011. The primary data, was collected from sago palm leaflet, and nutrient assesment in laboratory. The socondary data were found by interview and discussion with the company staffs and literature study in order to get more informations. Observation was replicated three times (Blok H29, N25 and H31). Each replication containing 20 sago palm tree. In each replication measured two parameters : phase and plant quality. The plant quality measure by number of frond in each main sago plant. The phase divide in two categories: after trunk formation (SP) and before trunk formtion (BP). Sago palm that have frond more than or equal seven , marking as 1 and sago plam that have frond less equal than seven mark as 0. The result showed that frond 9 to be sampled at after trunk formation phase and frond 3 suggest to be sampled at before trunk formation phase.
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Judul: Pengelolaan budidaya sagu (Metroxylon spp.) Di PT National sago prima, Selat Panjang, Riau dengan aspek khusus pemangkasan dan aplikasi
Abstrak: The study was conducted in PT National Sago Prima, Selat Panjang, Riau on February to June 2011. The study aimed to provide knowledge, skills, technique capability and management of sago palm especially in sago nursery. The method are direct for getting primary data and indirect for secondary data. Secondary data takes from interviewing and discussing with the company staff and literacy study to get more information. Generally, the primary data could get from technique activity in the field but the focus case in sago nursery. The experiment was conducted to obtain information in a nursery on the effects of trimming and organic hormone application. The experiment was arranged in Split-plot design, where the main plot was trimming on sucker petiole with three factors (without trimming (P0), trimming 20 cm above baneer (P1), and trimming 30 cm above baneer (P2)) and the subplot was four factors of application of organic hormone (without concentration (H0), concentration 1ml/l (H1), concentration 3 ml/l (H2), and concentration 5 ml/l (H3)). The result showed trimming on sucker petiole was significant difference in presentation survival rate and vegetative growth. Trimming 20 cm above baneer (P1) better than trimming 30 cm above baneer (P2) and without trimming (P0). Generally, organic hormone application didn’t show any significant difference, but organic hormone application concentration 5 ml/l (H3) was significant difference in number of sucker leaves, new leaf length, and trimming leaf wide. The interaction between treatments was significant difference in trimming leaf length and number of sucker new leaflet. Based on average value trimming 20 cm above baneer and without concentration (P1H0) showed the best result in survival rate and number of sucker leaves. The survival rate of sucker was positively correlated with the emergence of breath root. The results of this experiment showed that the hight survival rate of sucker displayed higher percentage of emergence breath root.
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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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