Judul: Pengaruh Pemberian Bahan Pembenah Tanah dan Pupuk Cair terhadap Pembibitan Tanaman Kelapa Sawit pada Ultisol Jasinga
Abstrak: The soil ameliorant of Baode root is an useful microbe for improving the growth of plant. These microbes are classified into types of microbes that can produce PGPR (Plant Growth Promoting Rhizobacteria) substances. The main microbe in Baode soil ameliorant is Bacillus laterosporus. In the soil, this bacteria is very useful to reduce the negative effects of pathogens. The Baode leaf is an organic compounds that contains the growth hormone, which are useful for increasing plant growth by regulating enzymes, improving photosynthesis, and reducing the negative impact of disease on plants. The liquid fertilizer of GD is an of organic compound which has 10% humic material. Humic material is a substance that can be extracted from various types of soil which contains C, N, and S elements higher than its origin material. This research aims to look to the influence of Baode soil ameliorant and GD liquid fertilizer to the oil palm plant nurseries. In this research there were seven treatment groups namely KT, BTSM, BTR, BTSMS, BTRS, GR, GRS. The doses of Baode soil root material was 2 g/l to immerse the seeds and pour directly into the soil and 1 g/l of Baode leaf to spray the leaf. The doses of GD liquid fertilizer was 2 ml/l to immerse the seeds and 1 ml/l to spray the leaf. The basic fertilizers were Urea 0.81 g/polybag, SP18 1.8 g/polybag, and technical KCl 0,4 g/polybag. The media that were used to plant were 11,52 kg/polybag (BKU) of Ultisol Jasinga with 208, 46 g/polybags compost and 42,4 g/polybags lime. The results from the analysis of covariance showed that the treatment from the Baode soil material and GD liquid fertilizer have a significant effect in some of the results that has been analyzed and the parameters that were observed in the field. On the 3 MAP (Month after Planting) yields of crops, BTRS and BTR treatments have the best growth, but when entering the age of 6 MAP the best treatments were found in GR, GRS, BTR, BTRS. The plant growth in the GR treatment practically the best if seen from its height, as seen from the early days of planting. The condition of plant roots during 3 MAP, KT treatment had the best 3 length of roots. This condition changed when the plants were 6 MAP, GRS treatment has the best length of root among other treatments. The highest value of total dry weight of plants at 3 MAP was in BTRS treatment that was 2,25 g/polybag, whereas in 6 MAP was in the GR treatment that was 19,57 g/polybag. The highest value of plant nutrient uptake at 3 MAP was the element of N, P and K contained in the BTRS treatment, while at 6 MAP found in GR treatments. The high values of absorption on these two treatments were because their values on the dry weight were high. This was caused by the effect of the growth hormone on leaf Baode soil material and GD liquid fertilizer and the influence of B. laterosporus that exists on the root Baode soil material
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Judul: Pengaruh pemberian bahan pembenah tanah dan pupuk cair terhadap pembibitan tanaman kelapa sawit pada ultisol jasinga.
Abstrak: Bahan pembenah tanah Baode akar merupakan mikrob yang berguna untuk meningkatkan pertumbuhan tanaman. Mikrob ini termasuk ke dalam mikrob yang dapat memproduksi sejenis PGPR (Plant Growth Promoting Rhizobacteria). Mikrob utama yang terkandung dalam bahan pembenah tanah Baode adalah Bacillus laterosporus. Bakteri B. laterosporus dalam tanah dapat berfungsi untuk mengurangi pengaruh buruk dari mikrob–mikrob patogen. Bahan pembenah tanah Baode daun merupakan senyawa organik yang berisi hormon pertumbuhan yang berfungsi untuk meningkatkan pertumbuhan dengan mengatur enzim, meningkatkan fotosintesis, dan mengurangi dampak negatif dari penyakit pada tanaman. Pupuk cair GD merupakan senyawa organik yang mengandung 10% bahan humat. Bahan humat merupakan suatu senyawa yang dapat diekstrak dari berbagai jenis tanah di mana senyawa ini mengandung unsur C, N, dan S yang lebih tinggi dari bahan asalnya.
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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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