Judul: Perbaikan Pertumbuhan Tanaman Sengon (Paraserianthes falcataria (L.) Neilsen) dengan Teknik Lateral Root Manipulation (LRM) di Bojong Jengkol, Kabupaten Bogor
Abstrak: Sengon is a fast growing tree species that has good adaptation. But when the land have been compacted and densited, sengon shows dwarfed growth. A lateral root manipulation (LRM) is one of cultivating plants that can fix the growth of plants. The study is aimed to know the effect of LRM technique on the sengon improvment growth. The methodology applied the factorial randomized design method which have three factors. The first factor is to cut the lateral root, the second is to apply stimulantion on root and microbe, and the third is to fertilize periodic. The results show that combination cutting root and fertilize periodic without applying stimulantion on root and microbe increase height improved 10,45 cm per week and number of bud 10 peices per week. All treatments did not effect on the stem diameter. The variables of the treatment visualy dont changes significally color of leaf and new root growing. However, the treatment of cutting root can stimulate to grow a new root.
Keyword: Bogor Agricultural University (IPB), root and microbe stimulant, Paraserianthes falcataria, lateral root manipulation, fertilize

Judul: Pertumbuhan Tanaman Sengon (Paraserianthes falcataria (L.) Nielsen) pada Kebun Campuran di Desa Karacak, Kecamatan Leuwiliang, Kabupaten Bogor
Abstrak: Salah satu tanaman penghasil kayu yang ditanam pada kebun campuran di Desa Karacak ialah sengon. Pemilihan kombinasi dan jarak tanam tanaman yang dibudidayakan pada kebun belum direncanakan sebelumnya, sehingga memungkinkan terjadinya perbedaan respon bagi pertumbuhan tanaman sengon. Penelitian ini bertujuan untuk melakukan pengkajian pertumbuhan tanaman sengon yang berkaitan dengan komposisi, jarak tanam, dan manajemen pengelolaan, dan juga mengkaji persentase penutupan tajuk tanaman pada kebun campuran di Desa Karacak, Kecamatan Leuwiliang, Kabupaten Bogor. Hasil penelitian menunjukkan kebun campuran KC 4a dengan tanaman sengon umur 1-1,5 tahun dan KC 3b dengan tanaman sengon umur 3 tahun, memiliki pertumbuhan tinggi yang cukup baik dan pertumbuhan diameter yang kurang baik. Sedangkan persentase penutupan tajuk pada kebun campuran tanaman sengon umur 1-1,5 tahun relatif kecil dibandingkan dengan tanaman sengon umur 3 tahun. Pengaruh jarak tanam, komposisi, dan kegiatan pengelolaan diduga menjadi faktor rendahnya pertumbuhan dimensi tanaman dan nilai persentase penutupan tajuk. Petani kebun campuran menganggap sengon merupakan tanaman tidak memerlukan pemeliharaan intensif dan kegiatan pengelolaan lahan yang hanya difokuskan pada tanaman buah-buahan dan tanaman semusim, menyebabkan pertumbuhan dimensi tanaman sengon rendah.
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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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