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 Arbuscular Mycorrhizal Fungi (AMF) Results of Different Fortification and Fertigation Techniques on Indigofera zollingeriana (Miq.) Plants Field Scale
Abstrak: Penelitian ini dilakukan untuk mengevaluasi efektivitas FMA hasil fortifikasi dan teknik fertigasi berbeda pada tanaman Indigofera zollingeriana skala lapang. Metode penelitian ini menggunakan rancangan acak kelompok (RAK) berdasarkan perbedaan teknik produksi inokulum fungi mikoriza arbuskula pada tanaman indigofera yang meliputi 6 perlakuan (Inokulum FMA dengan fortifikasi AB mix 1000ppm;2000ppm;3000ppm fertigasi datar, Inokulum FMA dengan fortifikasi AB mix 1000ppm;2000ppm;3000ppm fertigasi bertingkat) dan 5 ulangan. Parameter yang diukur terdiri dari tinggi tanaman (cm), jumlah daun, jumlah ranting, jumlah cabang, lingkar batang (cm), pH tanah, warna daun dan tingkat infeksi FMA. Hasil tingkat kolonisasi akar (yang sama tinggi ≥ 80%) dari semua teknik fertigasi dan teknik fortifikasi. Perlakuan IFB2 (Inokulum FMA dengan fortifikasi AB Mix 2000 ppm pada fertigasi bertingkat) menghasilkan jumlah daun dan warna daun yang lebih baik dibandingkan perlakuan lainnya., This research was conducted to evaluate the effectiveness of mycorrhizal inoculum resulting from fortification and different fertigation techniques on Indigofera zollingeriana plants. field scale. This research used a randomized block design (RAK) method based on differences in production techniques of arbuscular mycorrhizal fungi inoculum on indigofera plants which included 6 treatments (AMF inoculum with AB mix fortification 1000ppm; 2000ppm; 3000ppm flat fertigation, AMF inoculum with fortification AB mix 1000ppm;2000ppm;3000ppm graded fertigation) and 5 replicates. Parameters measured consisted of plant height (cm), number of leaves, number of twigs, number of branches, plant circumference (cm), soil pH, leaf color, and colonization of AMF infection. The result of root colonization rate (which was equally high 80%) of all fertigation and fortification techniques. The IFB2 treatment (FMA Inoculum with 2000 ppm AB Mix fortification in graded fertigation) resulted in a better number of leaves and leaf color compared to other treatments.
Keyword: Efektivitas, Arbuscula Mycorrhizal Fungi, Indigofera zollingeriana

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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