Judul: Kualitas Inokulum Tunggal dan Konsorsium Fungi Mikoriza Arbuskula pada Inang Sorghum dan Efektivitasnya pada Pembibitan Indigofera
Abstrak: The production process of forage plants often needs help with problems, especially in terms of low land availability and quality. Efforts are needed to increase the production of forage crops on marginal land, including the addition of biological fertilizers. Arbuscular mycorrhizal fungi (FMA) is a potential biofertilizer for increasing the production of forage crops on marginal land. The study objectives included (1) optimizing single and consortium AMF inoculum production techniques using the host plant Sorghum bicolor and (2) evaluating the most effective single and consortium AMF species in Indigofera zollingeriana plant nurseries. The experimental design used at each stage of the study was a completely randomized design (CRD). This research was divided into two stages, the first stage was the production of single and consortium AMF inoculum at the greenhouse scale using the host plant Sorghum bicolor with zeolite as a growth medium. The second stage was the application of single and consortium AMF inoculum products, which were the results from the first research stage on Indigofera zollingeriana using latosol soil as the growth medium. The results of the first stage of the study showed that single AMF inoculums and consortium were significantly different (P<0.05) on root colonization and spore count but not significantly different (P>0.05) on plant height, stem diameter, number of leaves, biomass fresh and dry biomass of host plant Sorghum bicolor. The results of the second stage of the study showed that inoculation of AMF in Indigofera zollingeriana nurseries in a single form resulted in effectiveness that was not significantly different (P>0.05) from the consortium's FMA inoculation on AMF colonization, plant height, stem diameter, fresh biomass and dry plant biomass. Inoculum inoculation in single form Glomus etinucatum resulted in a higher colonization value (P<0.05) than single inoculum Acaulospora tuberculata and Glomus manihotis. The results of the study can be concluded that the mass production of a single AMF and a consortium is effective on the host plant Sorghum bicolor by producing a very high percentage of root colonization (85.2-93.6%). Single AMF (Glomus etinucatum, Glomus manihotis, Acaulospora tuberculata, Gigaspora margarita, Glomus sp.) against a consortium AMF produced the same symbiotic effectiveness in terms of root colonization, morphological response and plant biomass production rate in Indigofera zollingeriana nurseries. Root colonization rate from single inoculum Glomus etinucatum was better than single inoculum Acaulospora tuberculata and Glomus manihotis.
Keyword: Consortium AMF, Indigofera zollingeriana, Mass Production, Single AMF, Sorghum bicolor

Judul: Teknik Produksi Inokulan Mikoriza Arbuskula Menggunakan Media Pasir dan Tanah Latosol pada Tanaman Inang Sorghum bicolor dan Setaria splendida.
Abstrak: Penyediaan hijauan pakan secara kontinu masih terhambat oleh lahan, yakni lahan untuk penanaman hijauan berupa lahan yang kurang subur dengan produktivitas rendah dan marginal. Pupuk hayati fungi mikoriza arbuskula (FMA) merupakan solusi pendukung untuk pertumbuhan tanaman pada lahan berkualitas rendah. FMA membantu penyerapan hara yang terbatas terutama fosfor. Inokulum FMA sebagai pupuk hayati hingga saat ini ketersediaannya terbatas di pasaran, karena teknik produksinya yang mahal. Tujuan dari penelitian ini adalah optimalisasi sistem produksi FMA menggunakan tanaman inang Sorghum bicolor dan Setaria splendida pada media pasir kali dan campuran pasir kali-tanah latosol. Penelitian menggunakan Rancangan Acak Lengkap pola faktorial (2x3) dengan 3 ulangan. Teknik produksi FMA dengan tanaman inang S. bicolor menunjukkan berbeda sangat nyata (P<0.01) pada jumlah spora dari interaksi media tanam pasir kali dan pupuk kompos. Respon yang berbeda terjadi pada tanaman S. splendida yang menunjukkan produksi inokulum lebih efektif pada kolonisasi akar mikoriza arbuskula (P<0.05) menggunakan media campuran pasir dengan tanah latosol dan jenis pupuk NPK. Produksi jumlah spora tidak dipengaruhi oleh bobot kering tajuk tanaman. Tanaman inang S. bicolor menunjukkan efektivitas lebih baik dengan menghasilkan jumlah spora tertinggi.
Keyword: media tumbuh, mikoriza, tanaman inang

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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