Judul: Respon pertumbuhan bibit karet (Hevea brasiliensis Muell. Arg.) terhadap pemberian inokulan cendawan mikoriza arbuskula dan pemupukan fosfor
Abstrak: The rubber plant is one of the commodities that have significance in the socio-economic aspects of Indonesian society. To increase the production and quality of the rubber must be done with good seeding techniques. This research objective to study the response of Arbuscular Mycorrhizal Fungi inoculants and dose of fertilizer P to the growth of rubber stump (Hevea brasiliensis Muell. Arg). The research was conducted at Cikabayan Experimental Farm from May to August 2014. The experiment designed as a randomized complete block design (RKLT) factorial with two factor and three replications. The first factor was three levels arbuscular mycorrhizal fungi inoculants dosage, i.e. without mycorrhizal inoculants, 10 g per plant, and 20 g per plant. Mycorrhizal inoculants was applied one month after rubber stump planted. The second factor were four level dosage of phosphorus of SP-36 fertilizer (0, 0.5, 1.0, 1.5 dosage recommended that is giving 3.88 g per plant at first month and 7.76 g per plant in the third month). The results showed that arbuscular mycorrhizal fungi inoculants was not significantly difference to length of buds, diameter of buds, number of petiole, number of roots, longest roots, dry weight and wet weight of roots, dry weight and wet weight of shoots. Phosphorus fertilization significantly affect to length of buds, and dry weight and wet weight of roots with linear response pattern. There was an interaction between the giving of arbuscular mycorrhizal fungi inoculants and dosage of phosphorus to length of buds, diameter of buds, and number of petiole. The best combination was 0.5 dosage recommended of SP-36 fertilizer and giving mycorrhizal inoculant 20 g per plant.
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Judul: Pengaruh inokulasi cendawan mikoriza arbuskula dan dosis pupuk P terhadap serapan hara P, pertumbuhan dan serat rami Boehmeria nivea L.Gaud
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh inokulasi mikoriza arbuskula dan dosis pupuk P terhadap serapan hara P, pertumbuhan dan serat rami. Percobaan ini dilaksanakan di kebun percobaan Teknologi Benih, Leuwi Kopo pada bulan November 2003 sampai Maret 2004. Percobaan disusun dalam Rancangan Acak Kelompok dengan dua faktor, yaitu inokulasi cendawan mikoriza arbuskula dan dosis pupuk P. Inokulasi CMA terdiri dari dua taraf, yaitu inokulasi 5 g mycofer/stek dan tanpa inokulasi. Dosis pupuk P terdiri dari empat taraf, yaitu 0, 5, 10, dan 15 P2O5/ha. Percobaan dilakukan dengan tiga ulangan sehingga terdapat 24 satuan percobaan. Satuan percobaan berupa petak berukuran 3.5 m x 2.5 m dengan populasi tanaman sebanyak 20 tanaman/petak. Hasil penelitian menunjukkan interaksi antara inokulasi cendawan mikoriza dan pupuk P berpengaruh terhadap kadar hara P pada daun dan rendemen serat. Kombinasi perlakuan inokulasi cendawan mikoriza dan pemberian 5 kg P2O5/ha dapat meningkatkan kadar hara P pada daun dibandingkan terhadap perlakuan tanpa inokulasi dan tanpa pupuk P. Kombinasi perlakuan inokulasi cendawan mikoriza dengan pemberian 10 kg P2O5/ha dapat meningkatkan rendemen serat dibandingkan terhadap perlakuan tanpa inokulasi cendawan mikoriza arbuskula dan tanpa pupuk P. Inokulasi cendawan mikoriza secara tunggal dapat meningkatkan jumlah spora dan infeksi akar. Inokulasi cendawan mikoriza menghasilkan jumlah batang per rumpun dan bobot basah akar yang lebih rendah dibandingkan terhadap tanpa inokulasi. Pemberian pupuk P secara tunggal dapat meningkatkan tinggi tanaman, diameter batang, indeks luas daun, dan bobot kering akar dibandingkan terhadap perlakuan tanpa pupuk P.
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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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