Judul: Keragaan Galur-galur Harapan Sorgum (Sorghum bicolor (L.) Moench) di Tanah Masam, Jasinga
Abstrak: This research was aimed to obtain information on performance of sorghum IPB breeding lines under acid soil conditions. The research was conducted at Cikopomayak, Jasinga, Bogor from March to August 2013. The experimental design used was Randomized Complete Block Design with genotype as the treatment. The plant materials used were 17 strain of sorghum IPB breeding lines, Numbu and UPCA S1 as check varieties. The results showed that there were significantly different among genotypes evaluated for leaf number, flowering time, panicle length and thousand of grain weight. Leaf number, plant height, diameter of stem positively correlated with biomass weight. Plant height, diameter of stem, biomass weight and thousand of grain weight positively correlated with grain weight panicle-1. The IPB breeding lines showed comparable grain weight panicle-1 to the check varieties. Yield potential of N/UP-4-3, N/UP-82-3, N/UP-118-7, N/UP-124-7, N/UP-139-1 dan N/UP-139-5 strain were better than UPCA S1 in range 3–4 ton ha-1.
Keyword: sorghum, performance, genotipe, acid soil

Judul: Keragaan Galur Sorgum (Sorghum bicolor (L.) Moench) di Tanah Masam Lampung Selatan
Abstrak: This study aims to obtain information on the performance of agronomic characters and yield components of sorghum F8 lines, to conduct yield trials of 17 F8 lines derived from a cross between Numbu x UPCA S1 in acid soils and to identify lines that have better yield than the parental lines. This study was conducted from March to August 2013 at the Experimental Field of BPTP Lampung, District Natar, South Lampung. The plant material used is 17 strain of sorghum varieties from crosses F8 Numbu as female parents and UPCA S1 as the male parent. The results of analysis of variance showed that the strain are not significantly different in harvesting time and weight of panicles but were significantly different to the character of stem diameter, number of leaves, flowering, seed / panicle weight and weight of 1000 seeds, as well as highly significant and a positive for plant height and panicle length. Positive correlation and highly significant was shown by panicle length with seed / panicle weight and weight of 1000 seeds. The N/UP-4-8, N/UP-48-2, N/UP-118-7, N/UP139-1, N/UP-139-5, N/UP-159-9 dan N/UP-166-6 strain are strain that have seedpanicle-1 weight larger than average strain evaluation
Keyword: yield components, sorghum, agronomic characters, acid soil stress conditions

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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