Judul: Kajian Hasil-Hasil Penelitian tentang Respon Pemberian Pupuk NPK terhadap Pertumbuhan Berbagai Semai dan Bibit Tanaman Kehutanan
Abstrak: The reforestation program is currently intensively implemented in Indonesia. However, its success rate is low. This is because most of the lands are of poor soil having lack of humus. One effort to increase the success of the program is the supply of quality seeds and fertilization. Collecting the results of research on the application of NPK fertilizer to forest plants is needed to determine the effectiveness of fertilizer on the plant growth. This study was done by collecting and analyzing the results of the research on the effect of NPK fertilizer on the growth of various forestry seedlings. The research data was taken from the library of the Forestry Faculty, Bogor Main Library (LSI) of Bogor Agricultural University, and Ardi Koesoema Library of R.I (the republic of Indonesia). Interviews were also conducted with the farmers of forest plant nursery as well as forestry researchers to collect the data. Forest plant species observed were Shorea ovalis, Dipterocarpus hasseltii, Paraserianthes falcataria, Khaya anthoteca, Anthocephalus cadamba, Acacia mangium, Eugenia polyantha, Gmelina arborea, Maesopsis eminii, Enterolobium cyclocarpum, Swietenia macrophylla, Agathis lorantifolia, and Toona sureni. The research results showed that NPK fertilizer could improve the quality of forest seedlings in the nursery. In addition, NPK fertilizer can improve the growth rate of seedlings planted on gold tailing and field. The result of the interview showed that some farmers used NPK on the nursery. The decision whether or not to use such fertilizer was based on the calculation of economic value and the experience of farmer. On the ather hand, the researchers viewed that fertilization should be done to help the soil providing complete and balanced nutrients for the plants to grow.
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Judul: Pengaruh pemberian pupuk cair fetifort, NPK dan organik terhadap laju pertumbuhan anakan Pinus merkusii Jungh et.de Vriese
Abstrak: Untuk mencapai keberhasilan pembangunan hutan tanaman dalam rangka memenuhi penyediaan bahan baku industri dan peningkatan produktivitas kayu maka pengadaan bibit dalam jumlah besar dan bermutu tinggi sangat diperlukan. Pendekatan yang dapat dilakukan untuk memperoleh bibit yang berkualitas baik salah satunya yaitu dengan pemupukan. Pemupukan terhadap Pinus merkusii penting dilakukan mengingat jenis ini termasuk salah satu jenis pohon industri yang mempunyai nilai produksi serba guna (antara lain kayu dan getahnya memiliki nilai perdagangan yang cukup tinggi) dan dapat dijadikan sebagai tanaman reboisasi di Indonesia (Pinus memiliki persyaratan selang ekologi tempat tumbuh yang cukup luas) (Alrasjid dkk., 1983). Penelitian ini bertujuan untuk mengetahui jenis pupuk dan kombinasi pupuk yang tepat sesuai dengan keadaan unsur hara tanah yang diteliti khususnya di KΡΗ Bandung Selatan dengan harapan diperoleh semai/bibit Pinus merkusii yang berkualitas baik dan dapat bertahan hidup dengan baik di lapangan. Pupuk yang digunakan dalam penelitian ini yaitu pupuk cair fertifort, NPK dan organik (kotoran ayam). Parameter yang diukur meliputi tinggi, diameter, jumlah daun, panjang akar, berat basah, berat kering dan nisbah pucuk akar. Rancangan percobaan yang digunakan adalah percobaan faktorial dalam Rancangan Acak Lengkap (RAL) dengan 3 faktor, yaitu faktor A (pupuk cair fertifort) terdiri dari 4 taraf (masing-masing yaitu kontrol, 5 cc/liter air, 7 cc/liter air dan 9 cc/liter air); faktor B (pupuk NPK) terdiri dari 4 taraf (kontrol, 100 ppm, 200 ppm, dan 300 ppm) serta faktor C (pupuk organik dalam hal ini kotoran ayam) terdiri dari 2 taraf, yaitu kontrol dan 50 gram/kg tanah. Ulangan dilakukan sebanyak lima kali pada setiap perlakuan....
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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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