Judul: Evaluasi koro benguk (Mucuna pruprirens) sebagai tanaman revegetasi pasca penambangan batubara Kalimantan Timur
Abstrak: Salah satu faktor yang menyebabkan keberhasilan reklamasi lahan pasca penambangan batubara adalah pemilihan jenis vegetasi yang tepat sehingga efektif dan efisien sesuai dengan kondisi ekologi setempat dalam memperbaiki kualitas tanah pasca penambangan. Tanaman Koro Benguk (Mucuna pruprirens) merupakan tanaman cover crop yang dapat tumbuh dilahan bekas penambangan batubara. Tanaman ini dapat menaikan pH tanah, meningkatkan ketersediaan N dalam tanah dan sebagai tanaman konservasi yang dapat mengurangi erosi tanah. Penanaman koro benguk yang dilakukan pada disposal C1 (baru direklamasi) dan Disposal P ( baru lima 5 tahun direklamasi) bertujuan untuk mengevaluasi pertumbuhan, tanaman Koro Benguk (Mucuna pruprirens), serapan hara dan membandingkan sifat-sifat kimia (pH, KTK, C-Organik) pada kedua disposal tersebut. Penelitian menggunakan analisis secara deskriptif dengan membandingkan data setiap parameter antar perlakuan pada kedua disposal tersebut dengan 6 perlakuan yaitu Kontrol, Kompos NPK 50kg/ha dan TSP 25kg/ha, Pupuk Kandang NPK 50kg/ha dan TSP 25kg/ha, Kapur 100kg/ha pupuk NPK 50kg, TSP 25kg, kapur 150kg/ha NPK 50kg/ha TSP 50kg/ha dan kapur 200kg/ha NPK 50kg/ha TSP 50kg/ha, sebanyak 3 kali ulangan. Penelitian ini dilakukan di areal pasca penambangan Site Binungan operation PT Berau Coal Kalimantan Timur. Untuk analisis tanah dilakukan di Laboratorium Kimia Tanah Universitas Mulawarman dan Laboratorium Kesuburan Tanah Insitut Pertanian Bogor.
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Judul: The Effect of Humic Substance, Organic Matter, and Lime Ameliorant Application on the Growing of Koro Benguk (Mucuna pruriens) in Ex-Coal Mining Batulicin Mine South Kalimantan
Abstrak: One of the efforts to support the succesfully of ex-coal mining reclamation is improving land quality and choosing oppropiate plants. The application of humic substance to replace organic matter function is still limited. Koro Benguk (Mucuna pruriens) is one of a land cover crops which usually used on ex-coal mining. This plant is tolerant on acid soil, fast growing, high biomass, decomposed easily, and has a function as conservation plant which can reduce erosion. This research was aimed to study the effect of amelioran humic substances, organic matter, and lime ameliorant application on the growing of Koro Benguk and soil physical-chemical properties in ex-coal mining PT. Arutmin Indonesia, Batulicin Mine, South Kalimantan. Research has been done experimentally using descriptive analysis. This research consist of 9 treatments as follows: humic substances with dosage 2.5 l/ha; 5 l/ha; 7.5 l/ha; liming with dosage 3.45 ton/ha (50% Al-dd ); 6.9 ton/ha (100% Al-dd); lime with dosage 3.45 ton/ha (50% Al-dd) + humic substances 5 l/ha; lime with dosage 6.9 ton/ha (lime 100% Al-dd) + humic substances 5 l/ha dosage; organic fertilizer 100 ton/ha and control. All this treatments were repeated three times. The parameters which were used in this research are fresh weight and dry weight pf Koro Benguk 3.5 month after planting. Soil analysis was conducted in laboratory of Physical Land Resources Development and laboratory of Soil Physics and Conservation, Bogor Agricultural University. The results showed that application of humic substances gave the significanly increase of Koro Benguk plant biomass substantially 48.53 kg fresh weight and 11.81 kg dry weight, but was not significantly different on physicschemical properties. Liming application gave an effect on pH increased from 4.21 to 5.40 and decreasing Al from 10.17 me/100g to 0.29 me/100g. Organic fertilizer increasing C-organic from 0.16% to 0.96% and Cation Exchange Capacity (CEC) from 7.67 me/100g to 10.27 me/100g. Organic matter treatment decrease bulk density from 1.46 g/cm3 to 1.19 g/cm3.
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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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