Judul: Pertumbuhan Tanaman Pokok Sengon pada Beberapa Pola Agroforestri di RPH Jatirejo, Kecamatan Puncu, Kabupaten Kediri
Abstrak: Agroforestri is one of land use system that have applied by RPH Jatirejo in order to decrease the rate of damage forest and land conflict that often occurring between the society with Perhutani. Different pattern of agroforestry system can make different response for staple crops growth. The goal of this researches are to review the combined effect of agroforestry pattern and land management system to the growth of sengon (Paraserianthes falcataria). A combination of plants on each pattern agroforestri includes: pattern AF1 (sengon, mindi, chilli, corn), AF2 (sengon, mindi, corn, cassava), and AF3 Saturday (sengon, mindi, chili, corn, pineapple). AF3 pattern has the best average growth, although have more combination of plants. It suggest from more intensive activities of fertilizing. Pattern of AF2 show the lowest average growth. In this pattern just corn that get fertilizer treatment, cassava plants while having a voracious properties of nutrient elements in particular elements of P and K so that element for staple crops could be decrease. The percentage of the closing header, width and length average headers, as well as LCR at the smallest value shows the pattern of AF2. It can reduce the absorption of sunlight to expressing the photosynthesis which can inhibit the growth of staple crops. On the ground with low pH found elements Al that will binding P element, so P can’t be absorbed by the plants. This can occur in AF2 pattern. Although AF2 have P higher than AF1, but if the soil is more sour, P elements will be absorbed more difficult by the plants. The highest overfullness basa (KB) on the AF3 pattern shows that the land on AF3 pattern is not yet occure many land leaching and show fertile land.
Keyword: 

Judul: The Growth Of Semgon (Falcataria moluccana) at the age of 25 Months and Upland Rice (Oryza sativa) Productivity in an Agroforestry System
Abstrak: Agroforestri merupakan salah satu sistem pemanfaatan lahan dengan mengombinasikan dua atau lebih tanaman guna meningkatkan produktivitas lahan dan melestarikan lingkungan. Kombinasi jenis tanaman yang sering digunakan dalam sistem agroforestri yaitu tanaman sengon dengan padi gogo. Penelitian ini bertujuan untuk menganalisis pertumbuhan sengon umur 25 bulan dan produktivitas padi gogo varietas Rindang 1 dan Rindang 2 Agritan di bawah cekaman naungan sengon. Rancangan penelitian pertumbuhan padi menggunakan rancangan acak lengkap (RAL) faktorial dengan tiga faktor, yaitu pola tanam (monokultur dan agroforestri di setiap tegakan sengon Solomon F1, sengon Solomon F2, dan sengon lokal), metode tanam padi (lubang tanam dengan bambu dan tanpa bambu), dan varietas padi (Rindang 1 dan Rindang 2). Hasil penelitian menunjukkan bahwa pertumbuhan tinggi sengon terbaik ditunjukkan oleh sengon lokal, sedangkan pertumbuhan diameter dan luas tajuk terbaik ditunjukkan oleh sengon Solomon F2. Padi gogo Rindang 1 yang ditanam pada lubang tanam tanpa bambu pada pola tanam monokultur dan agroforestri sengon lokal memiliki produktivitas terbaik yaitu 0,0420 ton ha-1 dan 0,0402 ton ha-1., Agroforestry is a land use system by combining two or more crops to increase land productivity and preserve the environment. The combination of types of plants that are often used in agroforestry systems is sengon with upland rice. This study aimed to analyze the growth of sengon aged 25 months and the productivity of upland rice varieties of Rindang 1 and Rindang 2 Agritan under the stress of sengon shade. The research design for rice growth used a factorial completely randomized design (CRD) with three factors, namely cropping patterns (monoculture and agroforestry in each stand of sengon Solomon F1, sengon Solomon F2, and local sengon), rice planting method (planting holes with bamboo and without bamboo), and upland rice varieties (Rindang 1 and Rindang 2). The results showed that the best growth in height of sengon was shown by local sengon, while the best growth in diameter and canopy area was shown by Solomon F2. Rindang 1 upland rice planted in planting holes without bamboo in monoculture and local sengon agroforestry cropping patterns had the best productivity, namely 0.0420 tons ha-1 and 0.0402 tons ha-1.
Keyword: agroforestry, growth, productivity, sengon, upland rice

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.
Keyword: