Judul: Pengaruh Taraf Pupuk Organik Yang Diperkaya Terhadap Pertumbuhan Jagung Manis (Zea Mays Saccharata Sturt) Dan Sifat Kimia Tanah Pada Latosol Di Darmaga
Abstrak: The negative impact caused by the use of inorganic fertilizers pushes fanner to return to organic fanning system. However, because the decomposition process of organic fertilizers is slow and its amount is limited, the nutrition which can be absorbed by crop for its h'fO,,,,th is a little. Therefore, it is needed to combine organic fertilizers with inorganic fertilizers. The objective of this research was to evaluate the effectiveness at 6 levels of enriched organic fertilizer levels on the yield and the chemical of soil properties. This research was carried out in the experimental field of Cikabayan, Bogor. The plant analysis was done in the Laboratory of Chemistry and Soil Fertility, Soil Sciences Department, Faculty of Agriculture, Bogor Agricultural University. The study was conducted from March until September 2003. The treatnients consisted of 6 levels of enriched organic fertilizers: PO (dosage: 0 ton/hal; PI (dosage: 10 ton/hal; P2 (dosage: 20 ton/hal; P3 (dosage: 30 ton/hal; P4 (dosage: 40 ton/hal; and P5 (dosage: 50 ton/hal, with 4 replications. So, there were 24 treatments unit in this research. These fertilizers were consisted of organic fertilizers - 60 % of compost and 25 % of cow dung - combined with these inorganic fertilizers - 7 % of dolomite, 2 % of urea, 4 % of SP-36, and 2 % ofKe! The result of this research indicated that the enriched organic fertilizers treatments have an effect to improvement of measured parameters value. The best of yield, high of plant, and the chemical of soil properties were obtained at treatment of P5 with dosage 50 tonlha of enriched organic fertilizers. The worst of yield, high of plant, and the chemical of soil properties were occurred at treatment of PO (without enriched organic fertilizers).
Keyword: 

Judul: Pengaruh Pemberian Pupuk Organik pada Produksi dan Serapan Hara Jagung Manis (Zea mays) di Latosol, Darmaga
Abstrak: There are two form of organic fertilizers, solid and liquid. Solid organic fertilizer is usually applied to the soil. The advantage in application of organic fertilizers able to adsorb nutrients that easily lost and supply availability of nutrients and therefore can increase efficiency of fertilizer. The purpose of this study was to study the effect of organic fertilizer application on Latosol, Darmaga to production and nutrient uptake of corn as plant indicator. The experiment was conducted in the greenhouse by using completely randomized design consisting of seven treatments and each treatment was repeated four times so that there were 28 pot experiments. Seven treatments were consisted of control, standard, 75% PO + 50% S, 75% PO + 75% S; 100% PO + 50% S; 100% PO + 75% S, and 125% PO + 50% S. The parameters measured were plant height, weight of shoot, root weight, ear weight with and without cornhusk, uptake of N, P, and K nutrients in shoot and plant roots and the Corganic content, N-total, and CEC (cation exchange capacity) soil after the experiment. The result of experiment showed that the application of organic and anorganic (standard) fertilizer on plant height and weight of shoot was not significantly different than standard fertilizer (100% S). The weight of plant roots and nutrient uptake of N, P, and K of the shoot and plant roots in the treatment of 100% PO + 75% S was significantly higher than other treatments. Treatment combination of organic and anorganic (standard) fertilizer at the lower doses of standard recommendation significantly increased ear weight with and without cornhusk. Dosage recommendations based on the RAE value are the treatment of 100%PO + 50%S (158,66%) and 75%PO + 50%S (142,52%). The analysis of soil after the experiment showed that the use of organic fertilizer combined with anorganic fertilizer (standard) produced levels of C-organic, N-total, and the CEC soils tend to be higher than the standard (100% S) and control treatments. The use of organic fertilizer combined with anorganic (standard) fertilizer at lower doses (50% S and 75% S) increased effectiveness of fertilizer to increase the growth and production of corn.
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: