Judul: Pengaruh Plant Growth Promoting Rhizobacteria terhadap Biologi dan Statistik Demografi Aphis glycines Matsumura (Hemiptera: Aphididae) pada Tanaman Kedelai
Abstrak: On various plants, Plant Growth Promoting Rhizobacteria (PGPR) application known can suppress the development of plant pest population. This research aimed at PGPR effects against biology and statistic demographic of Aphis glycines Matsumura (Hemiptera: Aphididae) on soybean plant. This research conducted in the Department of Plant Protection, Faculty of Agriculture, Bogor Agricultural University. PGPR application, which consists of Bacillus polymyxa and Pseudomonas fluorescens can extend second instar nymphs stadia and life cycle of A. glycines. PGPR application also can effect to statistic demographic of Aphis glycines. The gross reproduction rate, net reproduction rate, and intrinsic growth rate of A. glicines on PGPR application plant is lower than non PGPR application plant. Moreover, PGPR application plant can extend long generation and doubling time of A. glycines. The use of PGPR can inhibits the development of A. glycines population on soybean plant.
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Judul: Pengaruh Residu Insektisida Applaud 10 WP Tehadap Pe4rkembangan Populasi Aphis glycines Matsumura Pada Tanaman Kedelai (Glycine max (L) Merril)
Abstrak: Tujuan dari penelitian ini adalah untuk mengetahui pengaruh residu beberapa perlakuan insektisida Applaud 10 P terhadap perkembangan populasi A. glycines. Dalam penelitian digunakan A. glycines sebagai serangga penelitian, tanaman kedelai sebagai tanaman inang dan Insektisida Applaud 10 WP sebagai perlakuan. Penelitian Ini menggunakan Rancangan Aeak Lengkap dengan model linear. Penelitian dilaksanakan dengan lima perlakuan insektisida dan setiap perlakuan diulang lima kali. Perlakuan tersebut adalah 0, 1, 10, 100 dan 1000 ppm, penempatan pot-pot penelitian dilakukan secara acak. Dilakukan analisis keragaman dan untuk melihat perbedaan antar perlakuan dilakukan uji Leda Nyata Jujur. Penelitian ini dilakukan di rumah kaca Jurusan Hama dan Penyakit Tumbuhan, pada bulan Juli sampai Agustus 1987. Insektisida Applaud 10 WP lebih berpengaruh terhadap populasi daripada kematian A. glycines. Pengaruh penekanan perkembangan populasi adalah dalam jangka waktu yang lama. ...
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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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