Judul: Penambahan Bentonit dan Frekuensi Penyiraman untuk Peningkatan Kualitas Visual dan Fungsional Rumput Bermuda (Cynodon dactylon var evergreen).
Abstrak: Golf courses are generally dominated by sand as growing media. As a result, high-permeability media so that watering becomes inefficient. This research was conducted to study the effect of the addition of bentonite and frequency of irrigation to improving visual and functional quality of bermuda grass (Cynodon dactylon var evergreen). Experiments using factorial completely randomized design with two treatment factors. The first factor is the addition of bentonite which consists of three levels ie 100% sand, 87.5% + 12.5% sand bentonite 25 mesh, and 75% sand + 25% bentonite 25 mesh. The second factor is the frequency of irrigation which consists of three levels ie every day, every two days, every three dayswith a volume of 400 ml / basin. This experiment uses three replications, so that there are 27 units experiment. Treatment of growing media mix with the irrigation frequency give significantly different results against all variables observation. Combination treatment media mix bentonite sand 75% + 25% with irrigation frequency of once every two days produce the best visual quality at the variable crown cover, shoot density and color of the leaves. Combination treatment media mix sand bentonite 87.5% + 12.5% with irrigation frequency of once every two days produce the best visual quality and functional at high variable grass, clipping dry weight, shoot dry weight, as well as on the efficiency of irrigation water use (EPAI). Combination treatment of a mixture of sand 75% + 25% bentonite with irrigation frequency of once every three days produce the best functional quality at the variable root dry weight and root length.
Keyword: bentonite, irrigation, functional quality, visual quality, bermuda grass

Judul: Kualitas visual dan fungsional rumput golf Cynodon dactylon var Tifway yang diberi pupuk NPK pada media campuran pasir dan bentonit
Abstrak: Golf is one of preferable sports that people do to maintain health. Golf course quality depends on the grass quality. Using the efficient fertilizer and the right growing media are the way to maintain the golf course grass quality. Therefore, the objectives of this research was to learn the visual and functional qualities of golf course grass Cynodon dactylon var Tifway that added with NPK fertilizer and sand with bentonite mixture and to suppose recommendation of the most appropriate and efficient fertilizer and growing media mixture composition. The experiment was arranged in factorial Randomized Block Design. The treatments consisted of two factor, NPK rate at 2.5 g/m2, 5 g/m2, and 10 g/m2; sand media 100 %, sand 87.5 % with bentonite 12.5 %, and sand 75% with bentonite 25%. The result showed that combination of highest NPK fertilizer dosage and media mixing of sand and bentonite created the best effect to visual quality (grass color) and functional qualities (grass height, yields, density). Combination NPK fertilizer dosage at 10 g N/m2/application and sand 87.5 % with bentonite 12.5 % was the recommendation of this research
Keyword: Bogor Agricultural University (IPB), visual quality, sand, functional quality, bermuda grass, bentonite

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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