Judul: Application of Mycorrhizal Biofertilizer in Improving Vegetative and Generative Phases in Peanut (Arachis Hypogea L.)
Abstrak: Budidaya kacang tanah telah lama dibudidayakan di Indonesia dan umumnya ditanam di lahan kering. Kacang tanah merupakan komoditas terpenting kedua setelah kedelai di Indonesia dengan kandungan minyak dan protein yang tinggi, kacang tanah merupakan sumber lemak dan protein nabati yang penting bagi masyarakat Indonesia. Penggunaan pupuk anorganik secara terus-menerus dapat berdampak buruk untuk tanah, untuk itu perlunya pupuk yang ramah lingkungan seperti pupuk hayati. Salah satu pupuk hayati yang populer saat ini yaitu pupuk hayati mikoriza. Penelitian dilakukan di kebun percobaan Cikabayan IPB dengan rancangan percobaan yang digunakan Rancangan Acak Kelompok (RAK) dua faktor dengan menggunakan tanaman kacang tanah. Perlakuan yang terdiri dari 8 taraf perlakuan yaitu perlakuan 1) Kontrol, 2) Pupuk NPK, 3) Pupuk organik, 4) Pupuk organik + NPK, 5) Mikoriza 5 gr, 6) NPK + Mikoriza 5 gr, 7) Pupuk organik + Mikoriza 5 gr, 8) Pupuk organik + NPK + Mikoriza 5 gr. Pupuk NPK yang digunakan adalah NPK 15-15-15 dengan dosis 2,8 g/tanam dan pupuk organik diberikan dengan dosis 180 g/tanaman. Rancangan ini dilakukan 3 kali ulangan sehingga total satuan percobaan menjadi 24 satuan percobaan. Parameter yang diamati meliputi tinggi tanaman, jumlah cabang primer, jumlah polong, bobot polong, kolonisasi atau infeksi akar, jumlah dan jenis spora. Hasil penelitian menunjukkan dengan pemberian pupuk NPK + pupuk organik + mikoriza 5 g dapat meningkatkan vegetatif dan generatif pada tanaman kacang tanah. Perlakuan NPK + pupuk organik + mikoriza 5 g (AOM) memiliki presentase infeksi yang sangat tinggi yaitu sebesar 86,67%. Pada perlakuan AOM memilki jumlah spora berjumlah 32 spora/10g tanah. Jenis spora yang berhasil berasosiasi ada 3 jenis yaitu Acaulospora sp1, Acaulospora sp2 dan Glomus etunicatum.
Keyword: Mycorrhizal, sp2 dan Peanut Glomus etunica tum, Root Infection, Spore Type

Judul: Pengaruh aplikasi pupuk organik dan pupuk anorganik terhadap pertumbuhan, produksi serta mutu benih kacang tanah (Arachis hypogaea L.)
Abstrak: The research was carried out at the Seed Science and Technology Laboratory, Soil Science Laboratory, Laboratory of Biology and Laboratory of Plant Ecology IPB Darmaga, Bogor from March to July 2006. The aim of the research was to study the effect of organic and inorganic fertilizers on growth, yield and seed quality of peanut (Arachis hypogaea L.). A single factor experiment with 9 treatments was arranged in a Randomized Block Design with 3 replications. The treatments consist of : recommended dosage of inorganic fertilizer (20 kg/ha Urea, 45 kg/ha TSP, 50 kg/ha KCI) = PI, Goat manure (5 ton/ha) = P2, combination of Goat manure (5 ton/ha) and inorganic fertilizer (20 kg/ha Urea, 45 kg/ha TSP and 50 kg/ha KCI) = P3, Rhizobium inoculant (40 g/2000 m2) = P4, combination of Rhizobium inoculant and inorganic fertilizer (10 kg/ha Urea, 22.5 kg/ha TSP and 25 kg/ha KCI) = P5, Biocompos (5 ton/ha) = P6, combination of Rhizobium inoculant (40 g/2000 m2) and Biocompos (5 ton/ha) = P7, MTM (200 g/ha) = P8, combination of MTM (200 g/ha) and inorganic fertilizer (20 kg/ha Urea, 22.5 kg/ha TSP and 25 kg/ha KCI) = P9. Results of the experiment showed that application of organic fertilizer and its combination with inorganic fertilizer could produce high seed yield similar to the recommended dosage of inorganic fertilizer, 17.30 -22.03 g /plant. However application of Rhizobium inoculant or Biocompos alone produced lower seed yield, 12.27 - 13.57 g /plant, than the recommended inorganic fertilization. MTM was the best treatment producing the highest seed yield and better performance where 4 of plant growth variables including branch number, leave width, dry and fresh weight of nodule significantly higher than those of the recommended inorganic fertilization. For seed viability and vigor as seed quality variables, there was no significant difference among the treatments.
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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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