Judul: The Effect of Sengon (Falcataria moluccana) Shade and Organic Fertilizer on Arrowroot Growth (Maranta arundinacea)
Abstrak: Agroforestri merupakan pengombinasian tanaman kehutanan (pepohonan) dengan tanaman pertanian yang dapat dilakukan secara bersamaan (pengaturan ruang) atau bergiliran (pengaturan waktu). Garut (M. arundinacea) merupakan salah satu tanaman pangan fungsional yang mampu beradaptasi dan tumbuh secara optimum di bawah naungan sehingga dapat dikombinasikan dengan sengon (F. moluccana) dalam sistem agroforestri. Tujuan penelitian ini adalah mengukur pertumbuhan Sengon Solomon F2 dalam sistem agroforestri, serta mengetahui pengaruh naungan sengon dan jenis pupuk organik terhadap pertumbuhan dan produktivitas garut. Penelitian ini menggunakan pupuk kandang sapi dan pupuk organik hayati (POH). Hasil penelitian menunjukkan pertumbuhan Sengon Solomon F2 yang berumur 3 tahun selama 5 bulan mengalami kenaikan tetapi tidak signifikan. Naungan sengon memberikan pengaruh yang nyata terhadap pertumbuhan garut dan produksi umbi yang dihasilkan, sedangkan jenis pupuk organik tidak memberikan pengaruh yang nyata. Pertumbuhan tanaman garut terbaik terdapat pada perlakuan tanpa naungan sengon dengan pemberian pupuk kandang sapi yang menghasilkan produksi umbi rata-rata sebesar 325,60 g/polybag, sehingga menghasilkan produktivitas sebesar 2,5 ton/ha.
Keyword: agroforestry, functional food, light intensity, manure, sengon

Judul: Pengaruh Pupuk Organik dan Anorganik pada Tanaman Garut (Marantha arudinaceae L.) di bawah Tegakan Sengon (Falcataria moluccana Miq.)
Abstrak: Increased population is one of the factor that increase the land conversion rate, both in forest and agriculture land. Agroforestry systems can be a solution for increased need of agricultural land. Agroforestry combine forest stand with agricultural plant. Kind of the forest stand that start to be cultivated was sengon stand combined with agricultural plant was arrowroot (M. arudinaceae). Production of arrowroot can be improved by anorganic or organic fertilizers. The objective of this research is to observe growth of arrowroot plant under the stand of sengon, to observe the influence from type and dose of fertilizer, and to determine the best dose for each type of fertilizer which influence plant to produce the best arrowroot. The parameters observed from arrowroot plant are percent survival, height, leaf width, leaf length, number of leaves, number of roots and roots weight. The organic fertilizer gave significantly effect to height and number of leaves on the dose of fertilizer 1 400 mL/ha. While the anorganic fertilizer gave significant effect to height, number of leaves, and roots weight on the dose of fertilizer 60 kg/ha.
Keyword: sengon, organic fertilize, arrowroot, anorganic fertilize, agroforestry

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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