Judul: Pengaruh Electric Furnace Slag, Dolomit, dan Unsur Mikro terhadap Sifat Kimia Tanah serta Pertumbuhan dan Produksi Tanaman Padi Sawah (Oryza sativa) Varietas IR 64 pada Tanah Gambut Dalam dari Kumpeh, Jambi
Abstrak: Pada tahun 2010 produksi padi sebesar 66,41 juta ton padi (gabah kering giling) dirasa belum mampu memenuhi kebutuhan beras. Keterbatasan lahan produktif menyebabkan ekstensifikasi pertanian mengarah pada lahan-lahan marjinal, salah satunya yaitu lahan gambut. Secara alamiah lahan gambut di Indonesia memiliki tingkat kesuburan rendah karena kandungan unsur hara yang rendah dan bersifat sangat masam. Upaya yang dilakukan untuk mengatasi masalah tersebut antara lain adalah pengapuran, penamban unsur hara makro dan mikro, serta penambahan bahan-bahan amelioran seperti: terak baja, abu vulkan, lumpur rawa, abu sisa pembakaran, dan lain-lain. Salah satu amelioran yang umum digunakan di Amerika, Jepang, dan Korea yaitu terak baja, tetapi di Indonesia belum digunakan. Padahal hasil penelitian sebelumnya menunjukkan bahwa terak baja (electric furnace slag) Indonesia dapat meningkatkan pH tanah, Ca dan Mg dapat dipertukarkan, dan meningkatkan ketersediaan Si dalam tanah. Penelitian ini bertujuan untuk mengetahui pengaruh electric furnace slag (EF Slag), dolomit, dan unsur mikro terhadap sifat kimia tanah serta pertumbuhan dan produksi tanaman padi pada tanah gambut. Penelitian dilakukan melalui percobaan inkubasi di laboratorium dan percobaan pot di rumah kaca dengan menggunakan tanah gambut yang berasal dari Kumpeh, Jambi. Dosis yang diberikan yaitu EF Slag 0%, 2%, 4%, 6%, dan 8% dan dolomit ekuivalen EF Slag 0%, 2%, 4%, 6%, dan 8%. Rancangan percobaan yang dipakai adalah rancangan acak lengkap (RAL).
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Judul: Pengaruh Electric Furnace Slag, Silica gel dan Unsur Mikro terhadap Sifat Kimia Tanah Serta Pertumbuhan dan Produksi Tanaman Padi Sawah (Oryza sativa L.) pada Tanah Gambut dari Kumpeh, Jambi
Abstrak: The staple food of Indonesian is rice, concequently paddy is the most important crop in agriculture. Peat soil is one of marginal land which potential to create the availability of land for paddy in Indonesia. Generally, peat soil in Indonesia has low fertility and availability of silicon (Si). Silicon is beneficial element for paddy rice. Recently, general material used as sources of Si in some countries is steel slag of which consist calcium silicate. One kind of steel slag produced in Indonesia is electric furnace slag. However, according to regulation of government (PP No. 18, 1999 and No. 85, 1999), steel slag is categoried at hazardous waste. The objectives of this research were to determine the effect of EF slag, silica gel, and micro elements on chemical properties of soil, growth and yield of paddy rice on peat soil and to evaluate content of heavy metal in rice for worthiness of rice consumption. This research used peat soil from Kumpeh Regency, Jambi. The research consisted of two experiments, they were incubation experiment in laboratory and pot experiment in greenhouse. The dosage applied for treatment of EF slag and silica gel were 0%, 2%, 4%, 6%, and 8%. Application of EF slag significantly increased pH, exchangeable Ca and Mg, available-Fe, Mn, Zn, SiO2, and P. Growth and yield of paddy rice with EF slag was better than with silica gel and micro nutrients. Furthermore, the content of heavy metal in rice was very low, so that the rice produced is not harmful and can be consumed.
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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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