Judul: Pengaruh aplikasi pupuk organik dan pupuk anorganik terhadap pertumbuhan, produksi serta mutu benih kacang tanah (Arachis hypogaea L.)
Abstrak: The research was carried out at the Seed Science and Technology Laboratory, Soil Science Laboratory, Laboratory of Biology and Laboratory of Plant Ecology IPB Darmaga, Bogor from March to July 2006. The aim of the research was to study the effect of organic and inorganic fertilizers on growth, yield and seed quality of peanut (Arachis hypogaea L.). A single factor experiment with 9 treatments was arranged in a Randomized Block Design with 3 replications. The treatments consist of : recommended dosage of inorganic fertilizer (20 kg/ha Urea, 45 kg/ha TSP, 50 kg/ha KCI) = PI, Goat manure (5 ton/ha) = P2, combination of Goat manure (5 ton/ha) and inorganic fertilizer (20 kg/ha Urea, 45 kg/ha TSP and 50 kg/ha KCI) = P3, Rhizobium inoculant (40 g/2000 m2) = P4, combination of Rhizobium inoculant and inorganic fertilizer (10 kg/ha Urea, 22.5 kg/ha TSP and 25 kg/ha KCI) = P5, Biocompos (5 ton/ha) = P6, combination of Rhizobium inoculant (40 g/2000 m2) and Biocompos (5 ton/ha) = P7, MTM (200 g/ha) = P8, combination of MTM (200 g/ha) and inorganic fertilizer (20 kg/ha Urea, 22.5 kg/ha TSP and 25 kg/ha KCI) = P9. Results of the experiment showed that application of organic fertilizer and its combination with inorganic fertilizer could produce high seed yield similar to the recommended dosage of inorganic fertilizer, 17.30 -22.03 g /plant. However application of Rhizobium inoculant or Biocompos alone produced lower seed yield, 12.27 - 13.57 g /plant, than the recommended inorganic fertilization. MTM was the best treatment producing the highest seed yield and better performance where 4 of plant growth variables including branch number, leave width, dry and fresh weight of nodule significantly higher than those of the recommended inorganic fertilization. For seed viability and vigor as seed quality variables, there was no significant difference among the treatments.
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Judul: Respon Pertumbuhan dan Produksi Dua Varietas Kacang Tanah (Arachis hypogaea L.) terhadap Sistem Tanam Alur dan Pemberian Jenis Pupuk
Abstrak: This research aims to study the effect of cropping systems and types of fertilizers on the growth and production of two varieties of peanut (Arachis hypogaea L.). The experiment was conducted at IPB Dramaga Leuwikopo KP, Bogor in February-June 2013. Experiments using a split plot design with a treatment consisting of two factors, namely cropping systems as main plots and fertilizer as the subplot. Cropping systems in the main plot consists of two levels, the deep furrow planting and conventional planting. Types of fertilizers on subplot consisted of three levels i.e. chicken manure, chicken manure + Dolomite lime, chicken manure + Dolomite lime + NPK compound. The results showed that the deep furrow planting system increase productivity based on dry kernel weight and dry pod weight better than conventional planting system. This is shown by the productivity of dry pods of Gajah variety of 2.93 tonnes ha-1 at deep furrow planting system than 2.55 tonnes ha-1 at conventional planting system, and for Jerapah variety of 2.61 tonnes ha-1 at deep furrow planting system than 2.22 tonnes ha-1 at conventional planting system. Peanut cultivation by deep furrow planting system can improve efficiency in the use of plant nutrients supplied, both organic and inorganic fertilizers, so that the growth and yield of groundnut better. Fertilizers type of chicken manure + Dolomite lime + NPK compound give better effect on the growth and yield of plants than other fertilizers types.
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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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