Judul: Fungi Mikoriza Arbuskula dan Keberadaan Inangnya Dapat Memperbaiki Pertumbuhan Kedelai Organik
Abstrak: Soybean (Glycine max (L) Merrill) is one of the food crops as a source of vegetable protein. The purpose of this research was to determine the effect of rates of arbuscular mycorrhizal fungi (AMF) and the existence of sorghum, as an AMF host, on the growth and production of organic soybean. AMF was applied to each planting hole of soybean based on four different rates of 0, 1, 2, 2.5 g AMF hole-1. The existence of sorghum plant on the soybean plots, consisted of the presence and absence of sorghum in the plot. Both treatments were combined in nested design. Rates of AMF, in general, affected the growth and some yield components of soybean. Maximum growth was achieved at the rate of 2.08 g AMF hole-1. Soybean production was expected to increase in rate of more than 2.5 g AMF hole-1. Soybean productivity based on AMF rates were not significantly different, they were 1.35, 1.08, 1.04, and 1.15 ton ha-1 for 0, 1, 2, 2.5 g AMF ha-1, respectively. Without sorghum, soybean productivity was higher than that with the presence of sorghum, they were 1.25 and 1.05 ton ha-1, respectively. Improper placement of sorghum in the plot might have resulted in competition with soybean
Keyword: Sorghum bicolor, root infection, Glomus, Gigaspora, Acaulospora

Judul: Aplikasi Sembilan Produk Fungi Mikoriza Arbuskula Pada Tanaman Sorgum Varietas Samurai 1
Abstrak: Fungi Mikoriza Arbuskula merupakan simbiosis mutualisme antara fungi dan sistem perakaran tanaman tingkat tinggi untuk meningkatkan penyerapan unsur hara dalam tanah dan mengefisienkan pemakaian pupuk kimia. Penelitian ini bertujuan untuk menguji aplikasi sembilan produk fungi mikoriza arbuskula terhadap pertumbuhan dan produksi biomassa tanaman sorgum (Sorghum bicolor (L.) Moench) varietas samurai 1. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan 10 perlakuan dan 10 ulangan. Perlakuan kontrol menggunakan 100% dosis pupuk NPK dan perlakuan P1-P9 menggunakan 50% dosis pupuk NPK+20 gram produk fungi mikoriza arbuskula. Parameter yang diamati berupa: tinggi tanaman, diameter batang, jumlah daun, luasan daun, panjang malai, berat segar, berat kering, dan rasio daun dan batang. Data yang diperoleh dianalisis menggunakan Analisys Of Variance (ANOVA) dengan uji lanjut Duncan pada taraf uji 95%. Hasil penelitian menunjukkan bahwa mikoriza produk 6 dan produk 7 mampu menyamai perlakuan kontrol pada setiap parameter, sedangkan pada berat kering malai menunjukkan hasil yang lebih tinggi (p<0.05). Pemberian 20 gram produk mikoriza P6 ataupun P7 mampu menggantikan 50% dosis pupuk NPK yang digunakan Kata kunci: biomassa, pertumbuhan, produk FMA, pupuk NPK, tanaman sorgum., Arbuscular mycorrhizal fungi are a mutualism symbiosis between fungi and the root system of higher plants to increase the absorption of nutrients in the soil and make efficient use of chemical fertilizers. This study aimed to examine the application of nine products of arbuscular mycorrhizal fungi to the growth and biomass production of sorghum (Sorghum bicolor (L.) Moench) variety samurai 1. This study used a completely randomized design (CRD) with 10 treatments and 10 replications. Control treatment used 100% dose of NPK fertilizer and treatment P1- P9 used 50% dose of NPK fertilizer + 20 gram arbuscular mycorrhizal fungi product. Parameters observed were: plant height, stem diameter, number of leaves, leaf area, panicle length, fresh weight, dry weight, and leaf to stem ratio. The data obtained were analyzed using Analysis of Variance (ANOVA) with Duncan's further test at the 95% test level. The results showed that mycorrhizae product 6 and product 7 were able to match the control treatment on each parameter, while the dry weight of panicles showed significantly higher results (p<0.05). Giving 20 grams of P6 or P7 mycorrhizal products can replace 50% of the dose of NPK fertilizer used.
Keyword: Biomassa, Pertumbuhan, Produk FMA, Pupuk NPK, tanaman sorgum

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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