Judul: Pertumbuhan dan Produksi Tomat (Lycopersicon esculantum Mill.) Toleran Naungan pada Pola Tanam Tumpang Sari
Abstrak: Low light intensity is a limiting factor in the cultivation of intercropping. The purpose of this research was to study the effect of shade on growth and production of shade tolerant tomato in intercropping system. The treatments was conducted in IPB experimental farm in Cikabayan from February to June 2014. The treatments was arranged in randomized complete block design with three replications. The experiment consisted of 6 intercropping treatments, 3 monoculture of tomatoes (Rempai, Bogor, Palupi) and 2 monoculture of corn with 80 cm x 40 cm and 100 cm x 40 cm planting distance. The result showed that intercropping system decreased tomatoes plant growth and production, except Palupi which is increase on intercropping treatment than it’s monoculture. However, intercropping system doesn’t affected growth and production of corn. The intercropped of tomatoes and corn gave the land equivalent ratio (LER) = 1.56-3.60, indicating that agronomically intercropping system were more adventageous than those in the monoculture system.
Keyword: low light intensity, LER, Intercropping system, Bogor Agricultural University (IPB)

Judul: Shade Tolerance of 20 Genotypes of Tomato (Lycopersicon esculentum Mill.).
Abstrak: Tomato is one of the major vegetable that has been cultivated in Indonesia. Decrease of harvest area of tomato affect decreasing in production, so it requires an effort to improve tomato production. The efforts to improve tomato production were use the land under trees, agroforestry, or intercropping system. Low light intensityis a limiting factor in the cultivation of intercropping. Aim of this study was to evaluate the production, morphosiology, and fruit quality of 20 tomato genotypes under shade. This studywas conducted at Cikabayan (experimental station-University Farm of IPB) from January to April 2013. The research was arranged by nested design with 3 replicates. The main plot was shade consisted of four levels, i.e., 0, 25, 50, and 75%, while sub plot was 20 genotypes of tomato i.e. Intan (T1), GIK (T3), SSH 3 (T6), Karina (T13), Roma (T21), Rempai (T23), Apel (T30), SSH 9 (T33), SSH 20 (T34), M4HH (T43), Bogor (T53), Medan 4 (T57), Kediri 1 (T60), Papua 2 (T64), Montero (T80), Fatma (T82), Ratna (T83), Delana (T84), Palupi (T85), dan Mawar (T86). Results of this study showed that most of the tested genotypes increased the production per plant under 25% shade, while under 50% shade showed a high diversity among genotypes. Based on relative yield under 50% shade, genotypes can be grouped into three, there are : sensitive (Intan, Rempai and Delana), tolerant (GIK, Roma, SSH 9, SSH 10, Bogor, Kediri 1, Montero, Ratna, and Mawar), dan shade-like (SSH 3, Karina, Apel, M4HH, Medan 4, Papua 2, Fatma, and Palupi). Production per plants affected by the yield component, mainly number of fruit per plant. 50% shade significantly affected some morphologicsl characters ie plant height, and leaf area. 50% shade increase significantly up to 68% on plant height and 45% on leaf area. More over on physiological character, 50% shade significantly affect leaf thickness, chlorophyll a and b, and the ratio of chlorophyll a/b. 50 % shade significantly reduced tomato leaf thickness up to 25 %. Chlorophyll a and b increased by level of shade, while the ratio of chlorophyll a/b decreases. Shade also affects the quality of tomato fruits. Tomato diameter increase significantly by 7 % on shade-like genotype in 50 % shade. 50% shade not significant on firmness, otherwise decrease significantly on total solid soluble but increasing total titration acid on shade-like genotype.
Keyword: agroforestry, intercropping, morphosiology, production, quality

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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