Judul: Development and Testing of Organic Container Seedlings for forest tree production of Gmelina (Gmelina arborea Roxb.) in the Nursery
Abstrak: Organic Container Seedlings (OCS) is a container seedling made from organic materials used for forest trees seedling production its easily decomposer. OCS have an advanlage compared to polybags and environmentally friendly. The objective of this study was to develop container seedling based organic matter materials for forest trees seedling stock production. This study used Completely Randomized Experimental Design with 2 factors experiment, namely raw material composition and natural adhesive. The observed seedling growth, seedling height, seedling diameter, variables top root ratio and plants biomass. The data obtained were analyzed with F test (Analysis of Variance), further test and with Duncan multiple range test. The result showed that the interaction between raw material composition and natural adhesive had highly significant effect on gmelina growth in the nursery. Raw material has highly significant effect on top root ratio and biomass plant. The raw material of news paper : compos 1:1 sive the best performance of seedling growth, and increased their height and diameter by 3.90% and 1.07% respectively, whereas the adhesive of tannin was better than tapioca., Wadah semai organik adalah wadah semai yang terbuat dari bahan organik yang digunakan untuk pembibitan yang mudah terurai. Wadah semai memiliki keuntungan dibandingkan dengan polybag dan ramah lingkungan. Tujuan dari penelitian ini adalah untuk membuat wadah semai berbahan dasar organik untuk persediaan pembibitan benih. Penelitian ini menggunakan Rancangan Percobaan Acak Lengkap dengan 2 faktor percobaan, yaitu komposisi bahan baku dan perekat alami. Pertumbuhan bibit yang diamati yaitu tinggi benih, diameter bibit, variabel rasio akar dan biomassa tanaman. Data yang diperoleh dianalisis dengan uji F (Analisis Varians), pengujian lebih lanjut dengan Uji Duncan. Hasil penelitian menunjukkan bahwa interaksi antara komposisi bahan baku dan perekat alami memiliki efek yang sangat signifikan terhadap pertumbuhan Gmelina (Gmelina arborea) di persemaian. Bahan baku memiliki efek yang sangat signifikan pada rasio akar dan biomassa tanaman. Bahan baku kertas Koran Kompos memberikan pertumbuhan terbaik untuk pertumbuhan benih, dan meningkatkan tinggi dan diameter berturut-turut sebesar 3,90% dan 1,07%, sedangkan perekat tanin lebih baik dari tapioka.
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Judul: Effect of Endophytic Fungi Inoculation and Ecoenzyme on the Growth of Gmelina (Gmelina arborea (Roxb.)) Seedlings
Abstrak: Tanaman selama pertumbuhannya memerlukan nutrisi, dan dapat bersimbiosis dengan mikrob bermanfaat. Tujuan penelitian ini adalah mengkaji pengaruh inokulasi cendawan endofit dan ekoenzim terhadap pertumbuhan bibit gmelina. Cendawan endofit yang digunakan yaitu Ochroconis sp., Ascotricha sp., dan Arthrinium malaysianum. Penelitian ini menggunakan rancangan tersarang (nested) dengan ekoenzim sebagai anak petak yang tersarang pada inokulasi cendawan endofit sebagai petak utama. Hasil penelitian menunjukkan inokulasi cendawan endofit A. malaysianum menurunkan pertumbuhan tinggi dan diameter bibit gmelina. Inokulasi Ascotricha sp. menurunkan pertumbuhan tinggi bibit gmelina, dan inokulasi Ochroconis sp. menurunkan pertumbuhan diameter bibit gmelina. Inokulasi cendawan endofit tanpa ekoenzim menghasilkan akar yang lebih panjang. Nilai nisbah pucuk akar dan indeks mutu bibit gmelina yang dihasilkan dari penelitian ini menunjukkan bibit telah siap untuk dipindahkan ke lapangan. Hasil penelitian ini dapat digunakan sebagai acuan dalam mengaplikasikan pupuk hayati pada tanaman kehutanan., Plants during their growth require nutrients, and can symbiosis with beneficial microbes. The purpose of this study was to examine the effect of endophytic fungi inoculation and ecoenzymes on the growth of gmelina seedlings. The endophytic fungi used were Ochroconis sp., Ascotricha sp., and Arthrinium malaysianum. This study uses a nested design with ecoenzyme as subplots nested on endophytic fungi inoculation as the main plot. The results showed that inoculation of the endophytic fungi A. malaysianum decreased the growth of gmelina seedling height and diameter. Inoculation of Ascotricha sp. decreased the growth of gmelina seedling height, and inoculation of Ochroconis sp. decreased the growth of gmelina seedling diameter. Endophytic fungi inoculation without ecoenzymes resulted in longer roots. As a result, shoot root ratio and seedling quality index showed that gmelina seedlings were ready to transplant in the field. The results of this study can be used as a reference in applying biological fertilizers to forestry plants.
Keyword: Arthrinium malaysianum, Ascotricha sp., Gmelina arborea, Ochroconis sp., seedling growth

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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