Judul: Pengaruh Taraf Pupuk Organik Yang Diperkaya Terhadap Pertumbuhan, Produksi, Kandungan Hara N, P, K Tanaman Jagung Manis (Zea Mays Saccharata Sturt), Dan Nilai Kritisnya Pada Latosol Darmaga
Abstrak: Dampak negatif yang disebabkan oleh penggunaan pupuk anorganik menclorong petani untuk kcmbali ke sistem pertanian organik (organic farming system). Namun, karena proses clekomposisi pupuk organik yang lambat dan jumlahnya yang terbatas menyebabkan hara yang dapat diserap oleh tanaman untuk pcrtumbuhannya juga menjacli seclikit. Oleh karena itu, cliperlukan kombinasi antara pupuk organik clengan pupuk anorganik. Tujuan penelitian ini aclalah untuk menguji efektivitas taraf pupuk organik yang cliperkaya terhaclap pertumbuhan, procluksi, kanclungan hara N, P, K tanaman clan nilai kritisnya pacla tanaman jagung manis pacla Latasol Oarmaga. Penelitian ini clilakukan di Kebun Percobaan Cikabayan, Bogor. Analisis tanamandilakukan di Laboratorium Kimia dan Kesuburan Tanah, Departemen Tanah, Fakultas Pcrtanian, Institut Pertanian Bogor. Penelitian berlangsung mulai bulan Maret sampai bulan September 2003.
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Judul: Pengaruh Taraf Pupuk Organik Yang Diperkaya Terhadap Pertumbuhan Jagung Manis (Zea Mays Saccharata Sturt) Dan Sifat Kimia Tanah Pada Latosol Di Darmaga
Abstrak: The negative impact caused by the use of inorganic fertilizers pushes fanner to return to organic fanning system. However, because the decomposition process of organic fertilizers is slow and its amount is limited, the nutrition which can be absorbed by crop for its h'fO,,,,th is a little. Therefore, it is needed to combine organic fertilizers with inorganic fertilizers. The objective of this research was to evaluate the effectiveness at 6 levels of enriched organic fertilizer levels on the yield and the chemical of soil properties. This research was carried out in the experimental field of Cikabayan, Bogor. The plant analysis was done in the Laboratory of Chemistry and Soil Fertility, Soil Sciences Department, Faculty of Agriculture, Bogor Agricultural University. The study was conducted from March until September 2003. The treatnients consisted of 6 levels of enriched organic fertilizers: PO (dosage: 0 ton/hal; PI (dosage: 10 ton/hal; P2 (dosage: 20 ton/hal; P3 (dosage: 30 ton/hal; P4 (dosage: 40 ton/hal; and P5 (dosage: 50 ton/hal, with 4 replications. So, there were 24 treatments unit in this research. These fertilizers were consisted of organic fertilizers - 60 % of compost and 25 % of cow dung - combined with these inorganic fertilizers - 7 % of dolomite, 2 % of urea, 4 % of SP-36, and 2 % ofKe! The result of this research indicated that the enriched organic fertilizers treatments have an effect to improvement of measured parameters value. The best of yield, high of plant, and the chemical of soil properties were obtained at treatment of P5 with dosage 50 tonlha of enriched organic fertilizers. The worst of yield, high of plant, and the chemical of soil properties were occurred at treatment of PO (without enriched organic fertilizers).
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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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