Judul: Penggunaan Pupuk Organik Cair Untuk Mengurangi Dosis Penggunaan Pupuk Anorganik Pada Padi Sawah (Oryza sativa L.)
Abstrak: Use Of Organik Liquid Fertilizer For Reducing The Dose of Inorganik Fertilizer Use in Paddy Rice Fields. This research started from Oktober 2009 until Februari 2010, located in Desa Situgede, Kecamatan Bogor Barat. This research Used One Faktor Randomize Complete Block Design with three times aplication. The treatment of liquid organik fertilizer kinds I and II in combination with NPK fertilizer capable of providing growth and yield of rice which is bigger then not significantly with just the NPK treatment. Eventough, several liquid organik fertilizer treatment agronomicaly efectif. It is means, organik liquid fertilizer can increase the paddy yield, eventhough not statistic significantly and potential to reduce the dosis of NPK anorganik fertilizer.
Keyword: 

Judul: Pengaruh Reduksi Pupuk NPK Dengan Pembenaman Jerami, Aplikasi Pupuk Organik dan Pupuk Hayati Terhadap Pertumbuhan dan Hasil Padi Sawah (Oryza sativa L.) di Indramayu
Abstrak: The research aimed to study the Effect of NPK Fertilizer Reduction by Straw in corporation, Organic and Biofertilizer Application on Growth and Yield of Paddy (Oryza sativa L.) in Indramayu, West Java. The experiment was conducted in Sendang village, Karang Ampel district, Indramayu, West Java, from november 2010 to march 2011. This research used randomized completely blok design with 13 treatments and 3 replication, with continue test Dunnet at level 5%. That is P1: without straw + 1 dose NPK, P2: straw + 1 dose NPK, P3: without fertilizer and without straw, P4: straw + 0.5 dose NPK, P5: straw + 0.5 dose NPK + Biofertilizer 1, P6: straw + 0.5 dose NPK + Biofertilizer 1 + decomposer, P7: straw + 0.5 dose NPK + Biofertilizer 1 + Granule Organic fertilizer (POG), P8: straw + 0.5 dose NPK + POG + Liquid Organic fertilizer (POC) + decomposer, P9: straw + 0.5 dose NPK + Biofertilizer 1 + POG + POC + decomposer, P10: straw + 0.5 dose NPK + 1 Biofertilizer 2, P11: without straw + 0.5 dose NPK + 1 dose Biofertilizer 2, P12: without straw + 0.5 dose NPK + 0.5 Biofertilizer 2, P13: straw + 0.5 dose NPK + 0.5 dose Biofertilizer 2. The research straw was hight yield that one dose NPK treatment. Rice straw aplication in corporation can reduce use of NPK fertilizer 50% without reducing yield of paddy.
Keyword: 

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
Keyword: