Judul: Pengaruh pyraclostrobin terhadap pertumbuhan, produksi dan kandungan amilosa biji jagung (Zea mays L.)
Abstrak: The aim of this research is to study the effect of pyraclostrobin application on Growth, production and amylase content of maize. The research was done in KP. Cikabayan, University Farm, Bogor Agriculture Institute, on June to October 2011. The varieties used were N35 (V1), P21 (V2), Bisi 222 (V3) and Lamuru (V4). Dose of pyraclostrobin used were 0 ml/ha (P0) and 400 ml/ha (P1). The design of this research used Randomized Complete Design Group with three replication. Data analysis using F-test and it was then followed by Duncan Multiple Range Test at error level of 5 %. Statistically, the application of pyraclostrobin didn’t show significant effect on the growth and yield of maize. In several, application of pyraclostrobin (P1) showed yield higher than without pyraclostrobin (P0). The Varietas showed a significant effect on the growth, yield and amylose content of maize. The research showed for increased production, N35 respon better to the application of pyraclostrobin 400 ml ha-1. The aplication pyraclostrobin of 400 ml ha-1 tended to increase the content of amylose in Bisi 222 and Lamuru.
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Judul: Pengaruh Kombinasi Kotoran Sapi, Pupuk Daun Silika, dan Pestisida terhadap Pertumbuhan dan Produksi Jagung (Zea mays) serta sifat Kimia Latosol, Dramaga
Abstrak: Maize is one of the agricultural crops that has similiar carbohydrate content with rice. The addition of foliar silica fertilizer is potential to prevent soil and water stress, pest attack, and to increase disease resistence as well as the growth and production of maize. This study was aimed to determine the effect of cow-dung manure, NPK fertilizer, foliar silica fertilizer and pesticides combinations on maize (Zea mays) growth and production and also on soil chemical properties of Latosol, Dramaga. The research was designed with randomized block design (RBD) with nine treatments and three replications. Treatment combinations was consisted of T0 (control), T1 (NPK), T2 (NPK + Foliar silica fertilizer), T3 (NPK + Pesticides), T4 (NPK + Foliar silica fertilizer + ½ Pesticides), T5 (Cow-dung manure + ½ NPK), T6 (Cow-dung manure + NPK + ½ Foliar silica fertilizer), T7 (Cow-dung manure + ½ NPK + pesticides), and T8 (Cow-dung manure + ½ NPK + Foliar silica fertilizers + ½ Pesticides). The results showed that generally cow-dung manure + ½ NPK (T5-T8) treatments indicated higher effect in promoting growth, nutrients uptake and corn cob production compared to treatments of NPK (T1-T4). The combination of NPK fertilizer, cowdung manure, foliar silica fertilizer and pesticides did not show significant effect statistically on soil total N, available P, and available Si. The exchangable potassium of soil tended to be higher in NPK combination (T1-T4) than cow-dung manure + ½ NPK combination (T5-T8). However, soil C-organic content in cowdung manure + ½ NPK combination (T5-T8) was higher than that in the NPK combination (T1-T4).
Keyword: Bogor Agricultural University (IPB), foliar silica fertilizer, cow-dung manure, maize

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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