Judul: Optimization of Inoculation Time and FMA Level on Alfalfa Plants (Medicago sativa L.)
Abstrak: Alfalfa merupakan tanaman subtropis yang sulit beradaptasi di daerah tropis. Penelitian ini bertujuan mengevaluasi efektivitas pemberian fungi mikoriza arbuskula (FMA) berdasarkan waktu inokulasi dan level terhadap pertumbuhan tanaman alfalfa (Medicago sativa L.). Rancangan percobaan berupa Rancangan Acak Lengkap (RAL) faktorial 2 x 6 dengan 20 ulangan. Faktor I yaitu waktu inokulasi, meliputi persemaian dan pembibitan. Faktor F yaitu level FMA, meliputi kontrol positif, 0 g FMA (A50F0), 5 g FMA (A50F5), 10 g FMA (A50F10), 15 g FMA (A50F15), dan 20 g FMA (A50F20). Hasil penelitian menunjukkan waktu inokulasi dan level FMA berpengaruh nyata (P<0,05) terhadap morfologi tanaman. Tanaman dengan inokulasi FMA memberikan respon yang baik terhadap kolonisasi FMA, berat segar dan kering tanaman alfalfa. Kesimpulan bahwa inokulasi FMA efektif meningkatkan produktivitas tanaman alfalfa (kolonisasi akar, tinggi, jumlah daun, jumlah tangkai daun, jumlah cabang, diameter batang, berat segar dan kering, serta warna daun) dibanding kontrol dan tanpa FMA. Inokulasi FMA pada periode persemaian cenderung lebih efektif. Inokulasi FMA level 20 g pada periode persemaian memberikan hasil yang baik secara konsisten., Alfalfa is a subtropical plant that is difficult to adapt to the tropics. This study aims to evaluate the effectiveness of arbuscular mycorrhizal fungi (FMA) application based on inoculation time and level on alfalfa plant growth (Medicago sativa L.). The experimental design is a 2 x 6 factorial completely randomized design (CRD) with 20 replications. Factor I is the time of inoculation, including nursery (I1) and seedling (I2). Factor F is FMA level, including positive control (A100F0), 0 g FMA (A50F0), 5 g FMA (A50F5), 10 g FMA (A50F10), 15 g FMA (A50F15), and 20 g FMA (A50F20). The results showed that inoculation time and FMA level had a significant effect (P<0.05) on plant morphology. Plants with FMA inoculation gave a good response to FMA colonization, fresh and dry weight of alfalfa plants. It is concluded that FMA inoculation effectively increases alfalfa plant productivity (root colonization, height, number of leaves, number of petioles, number of branches, stem diameter, fresh and dry weight, and leaf color) compared to control and without FMA. FMA inoculation in the nursery period tends to be more effective. FMA inoculation level of 20 g in the nursery period gave consistently good results.
Keyword: alfalfa, fungi, inokulasi, mikoriza arbuskula

Judul: The Effectiveness of Vermicompost Fertilizer and  Arbuscular Mycorrhizal Fungi in Increasing the Productivity of Alfalfa Plants (Medicago sativa L.)
Abstrak: Penelitian ini bertujuan menguji pengaruh pemberian pupuk vermikompos dan fungi mikoriza arbuskula (FMA) terhadap produktivitas tanaman Alfalfa (Medicago sativa L.). Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan 220 sampel yang dibagi menjadi 11 perlakuan dan 20 ulangan. Perlakuan terdiri dari K0 = Media tanah tanpa perlakuan; K100 = K0 + 100% NPK; K50 = K0+ 50% NPK; AV1 = K50 + 100 g vermikompos; AV2 = K50 + 200 g vermikompos; AF1 = K50 + 10 g FMA; AF2 = K50 + 20 g FMA; AVIF1 = K50 + 100 g vermikompos + 10 g FMA; AV1F2 = K50 + 100 g vermikompos + 20 g FMA; AV2F1 = K50 + 200 g vermikompos + 10 g FMA; AV2F2 = K50 + 200 g vermikompos + 20 g FMA. Parameter yang diukur adalah persentase kolonisasi akar, tinggi tanaman, jumlah cabang, jumlah daun, diameter batang, panjang akar, berat segar akar, berat segar tajuk, dan berat kering tajuk. Hasil penelitian menunjukkan bahwa perlakuan kombinasi vermikompos dan FMA sangat berpengaruh nyata (P<0,01) dalam meningkatkan seluruh parameter yang diamati. Simpulan dari penelitian ini adalah kombinasi pupuk vermikompos 200 g dan FMA 10 g efektif meningkatkan produktivitas tanaman Alfalfa., TThis study aims to examine the effect of vermicomposting and arbuscular mycorrhizal fungi (AMF) on the productivity of Alfalfa plants (Medicago sativa L.). This study use a randomized complete design with 220 samples divided into 11 treatments and 20 repeats. The treatment consists of K0 = untreated media; K100 = K0 + 100% NPK; K50 = K0 + 50% NPK; AV1 = K50 + 100 g vermicompost; AV2 = K50 + 200 g vermicompost; AF1 = K50 + 10 g AMF; AF2 = K50 + 20 g AMF; AVIF1 = K50 + 100 g vermicompost + 10 g AMF; AV1F2 = K50 + 100 g vermicompost + 20 g AMF; AV2F1 = K50 + 200 g vermicompost + 10 g AMF; AV2F2 = K50 + 200 g vermicompost + 20 g AMF. The parameters measured are percentage of root infection, plant height, number of branches, number of leaves, stem diameter, root length, fresh weight of roots, fresh weight of leaves and steam, and dry weight of leave and steam The results showed that the combination treatment of vermicompost and FMA had a significant effect (P<0.01) in improving all observed parameters. The conclusion of this study is that the combination of vermicompost fertilizer 200 g and FMA 10 g effectively increases the productivity of Alfalfa plants.
Keyword: alfalfa, arbuscular mycorrhizal fungi (AMF), productivity, vermicompost

Judul: Persamaan Korteweg-de Vries Orde Tinggi untuk Menggambarkan Gerak Gelombang Internal
Abstrak: The ocean can be considered of layers of fluid that each layer has a constant density. Internal waves are waves occur in the interface of every'two layers with different density. Because it occures underneath the surface of the ocean, it is invisible. One of internal waves is internal solitary waves. One of formulation that can describe intemal waves movement is KdV equation. KdV equation is derived from governing equations of ideal fluid in Lagrange formulation using asymptotic method. On this thesis, KdV equation is derived in higher order and then its solution is derived by using internal solitary waves assumption. An example of a two-layer fluid is a case will be used. By using Mathematica6 software, for this case will be obtained the coefficients in lower and higher order explicitly and the corresponding between coefficients and relative lower layer depths and fluid depths, the corresponding between coefficients and relative densities, and also observed the different between solitary waves in lower and higher order.
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