Judul: Respon Padi Sawah Varietas IF8 dan Lentera terhadap aplikasi Kompos Limbah Biji Kopi, Organo-Mineral dan Pupuk Sintetik pada Inceptisol Situgede, Bogor
Abstrak: Pemenuhan kebutuhan pangan merupakan salah satu masalah utama di Indonesia saat ini. Beras merupakan komoditas pangan paling strategis di Indonesia. Kebutuhan beras akan terus meningkat seiring dengan pertambahan jumlah penduduk, tetapi upaya peningkatan produksi beras terhambat oleh berbagai kendala yang berdampak terhadap penurunan produktivitas dan kualitas lingkungan. Penggunaan varietas unggul serta aplikasi amelioran dan pupuk yang tepat diharapkan dapat menjadi salah satu solusi permasalahan ini. Penelitian ini bertujuan mengevaluasi pengaruh aplikasi amelioran kompos limbah biji kopi dan organo-mineral serta pupuk sintetik pada sistem SRI organik dan konvensional terhadap pertumbuhan dan produksi padi varietas unggul lokal IF8 dan Lentera pada Inceptisol Situgede, Bogor. Percobaan dilaksanakan dengan Rancangan Petak Terbagi, dengan varietas padi sawah (V1-IF8 dan V2-Lentera) sebagai petak utama serta perlakuan ameliorasi dan pemupukan (P0-kontrol, P1-kompos limbah biji kopi [600 kg/ha], P2-organo-mineral [600 kg/ha] dan P3-pupuk sintetik [250 kg/ha Urea, 175 kg/ha SP36 serta 75 kg/ha KCI]) sebagai anak petak. Kompos limbah biji kopi mengandung 57.29% C-organik, 2.45% N, 0.09% P2O5 dan 0.16% K2O. Organo- mineral mengandung 44.61% C-organik, 9.34% N, 9% P2O5 dan 8.88% K2O. Setiap perlakuan diulang 3 kali sehingga percobaan ini terdiri atas 24 satuan percobaan.
Keyword: Composted coffee-bean waste, Organo-mineral, Synthetics fertilizers, IF8 rice variety, Lentera rice variety, Land resources, Coffee fertilizer, Model Sri, Food security, Rice production, System rice intensifisation

Judul: Respon tanaman padi sawah varietas IF8 dan Lentera terhadap aplikasi pupuk organo mineral dan pupuk hayati pada Inceptisol Situgede, Bogor
Abstrak: Paddy is a staple food for most of the Indonesian people. Paddy farmers usually use chemical fertilizers as the main production input to achieve high productivity. It causes a diminishing quality of soil chemical, biological, and physical properties. The research objective was to find out the effects of organomaterial fertilizer and biofertilizer on the growth and productivity of IF8 and Lentera paddy varieties using SRI planting pattern on an Inceptisol. The research consisted of land preparation, seedling, planting and fertilizers application, harvesting, observation, and data analysis and interpretation. The research used Split Plot CRD (Completely Randomized Design) experimental design with rice paddy varieties (IF8 and Lentera) and biofertilizer (without and 24 L/ha) as the main plot, and organo-mineral fertilizer (without and 600 kg/ha) as the sub slot, and 3 replications resulted in 24 experimental units. The main plot treatments significantly increased panicle length, numbers of unhulled rice per panicle, and crop productivity, but not significantly affected plant height, numbers of tillers, and weight of 1000 grains. The sub plot treatments significantly increased plant height, numbers of tillers, and crop productivity, but not significantly affected panicle length, numbers of unhulled rice per panicle, and weight of 1000 grains
Keyword: Lentera paddy, IF8 paddy varieties, organo-mineral fertilizer, biofertilizer

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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