Judul: Pengaruh Perlakuan Benih dengan Cendawan Mikoriza Arbuskula dan Dosis Pupuk Fosfat terhadap Pertumbuhan Tanaman dan Hasil Kedelai.
Abstrak: The objective of this research was to axamine the influence of application Arbuscular Mycorrhizal Fungi (AMF) and Fertilizer Fosfat to efficiency fertilizer P, gowth plant, and yield of soybean. This research was conducted from April to July 2010 at Agomikrobiologi Laboratory, Bioteknologi, BPPT PUSPIPTEK Serpong and Leuwikopo experimental field of Bogor Agicultural University. The experiment was arranged split plot design with two factors, dose fertilizer P and application FMA. The results of research showed that application FMA with coat and glue (I2) is a best treatment. This treatment increased gowth of plant, total of leaf, wet weight and dry weight of crown, wet weight of root, total and wet weight of root nodule, percentage of root infection, total of spore, and wet weight and dry weight of pod. The treatment of application FMA with coat and glue increased efficiency Fertilizer Fosfat as big as 75 % or be economized fertilizer P as big as 300 kg SP-18/ha. Application FMA in this research efectif in low dose fertilizer P, that is 100 kg SP-18/ha.
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Judul: Produksi Kedelai Organik berdasarkan Perbedaan Dosis Pupuk dan Fungi Mikoriza Arbuskula
Abstrak: Penelitian ini dilakukan untuk mengetahui pengaruh perbedaan dosis pupuk kandang ayam ditambah pupuk hijau dan pengaruh dosis Fungi Mikoriza Arbuskula (FMA) terhadap pertumbuhan dan produktivitas kedelai yang dibudidayakan secara organik. Penelitian dilaksanakan di Kebun Percobaan IPB, Cikarawang dan Laboratorium Pusat Penelitian Sumberdaya Hayati dan Bioteknologi, LPPM IPB dimulai dari bulan Oktober 2011–April 2012. Penelitian menggunakan Rancangan Acak Kelompok Faktorial, dua faktor dan empat ulangan. Faktor pertama adalah dosis pupuk organik, yaitu 6.25 ton pupuk kandang ayam per ha dengan penambahan 6.25 ton Tithonia diversifolia per ha dan 12.5 ton pupuk kandang ayam per ha ditambah 6.25 ton Tithonia diversifolia per ha. Faktor kedua adalah dosis FMA yang terdiri atas 0, 2.5, dan 5 g/lubang tanam. Sumber inokulum FMA berasal dari Departemen Silvikultur, Fakultas Kehutanan, IPB. Pupuk hijau T. diversifolia diperoleh dari hasil panen pucuk tanaman yang ada di sekitar lokasi penelitian.
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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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