Judul: Pengaruh Jenis Media Tanam terhadap Pertumbuhan Bibit Pepaya (Carica papaya L.) Genotipe IPB 3, IPB 4, dan IPB 9.
Abstrak: The research aims to study the influence of growing media types on seed germination and seedlings growth of papaya IPB 3, IPB 4 and IPB 9 genotypes and know growing medium suitable for growth of papaya seedlings is good and has a light weight to facilitate the transportation of seedlings. The research was conducted in March until September 2011 in the greenhouse FATETA IPB, Leuwikopo Bogor and The Experimental Garden of PKBT IPB, Tajur Bogor. The design used was Randomized Complete Design Group two factors. The first factor is the growing media with 5 kinds with the same ratio (2:1:1), namely M1 = soil: sand: manure, M2 = soil: sand: rice husk charcoal, M3 = soil: sand: cocopeat, M4 = soil: manure: cocopeat, and M5 = soil: manure: rice husk charcoal. The experiment consisted of 15 combinations with 3 replicates then there were 45 experimental units . The results showed that papaya seeds germinate is the highest of the growing media mix of soil, manure, and rice husk charcoal (M5) is 70% and IPB 3 genotype (G1) is 70.91%. The composition of media soil, manure, and rice husk charcoal (M5) with a ratio of 2:1:1 is the best medium for papaya seedlings at 6 MST and has a weight of seedlings per polybag is the lightest compared with other growing media to facilitate the transportation of seedlings.
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Judul: Pengaruh Komposisi Media Tanam dan Rhizobakteri Pemacu Pertumbuhan Tanaman terhadap Pertumbuhan Bibit Pepaya.
Abstrak: Pepaya (Carica papaya L.) merupakan salah satu buah tropika yang telah dibudidayakan secara intensif di Indonesia. Penelitian ini bertujuan untuk mengetahui pengaruh komposisi media tanam dan konsentrasi suspensi plant growth promoting rhizobacteria (PGPR) yang tepat untuk pertumbuhan bibit pepaya di pembibitan dan di lapangan. Percobaan dilaksanakan pada bulan Juli hingga Desember 2016 di Kebun Tirta Mekarsari, Kecamatan Rancabungur, Kabupaten Bogor, dengan rancangan kelompok lengkap teracak (RKLT) 2 faktor dan 3 ulangan. Perlakuan terdiri atas suspensi PGPR dengan konsentrasi 0 ml/l, 5 ml/l, 10 ml/l dan 15 ml/l dan komposisi media tanam (1:1) yang terdiri atas kontrol tanah: pupuk kandang (M0), (1:1:2) tanah: pupuk kandang: arang sekam (M1), dan (1:1:2) tanah: pupuk kandang: cocopeat (M2) sehingga terdapat 12 kombinasi perlakuan. Hasil percobaan menunjukkan bahwa konsentrasi suspensi PGPR mempengaruhi tinggi tanaman, jumlah daun, diameter batang dan panjang daun tanaman pepaya di pembibitan dan di lapangan. Komposisi media tanam hanya berpengaruh terhadap tinggi tanaman pepaya di lapangan. Interaksi antara konsentrasi suspensi PGPR sebesar 15 ml/l (K3) dengan campuran media tanam tanah dan pupuk kandang (M0) tidak berbeda dengan campuran media tanam tanah, pupuk kandang dan arang sekam (M1) yang mendukung pertumbuhan bibit yang baik.
Keyword: Carica papaya L., cocopeat, pupuk kandang

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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