Judul: Growth and Yield Response of Lettuce Plants (Lactuca sativa L.) to the Application of Vermicompost Fertilizer and Rabbit Biourine with Different Concentrations
Abstrak: Penggunaan pupuk anorganik pada tanaman selada memiliki banyak kekurangan salah satunya dapat merusak tanah. Oleh karenanya, diperlukan pengurangan pupuk anorganik yang disubtitusi dengan pupuk organik namun tetap memberikan hasil terbaik. Penelitian ini bertujuan mengetahui respon pemberian pupuk organik yaitu kascing dan biourin kelinci terhadap pertumbuhan dan hasil tanaman selada. Penelitian menggunakan Rancangan Kelompok Teracak (RKLT) faktorial. Faktor pertama adalah pupuk kascing (K), yaitu tanpa kascing (K0) dan dengan kascing (K1). Faktor kedua adalah konsentrasi biourin kelinci, yaitu 0% (U0), 6% (U1), 9% (U2) dan 12% (U3). Kedua faktor diuji dengan dua kontrol, yaitu tanpa pupuk susulan (kontrol-) dan dengan pupuk anorganik (kontrol+). Hasilnya menunjukkan perlakuan kascing berpengaruh nyata terhadap seluruh peubah kecuali kadar air, perlakuan biourin kelinci hanya bepengaruh nyata pada bobot akar, dan interaksi antara kascing dan biourin berpengaruh nyata pada tinggi tanaman 2 MST dan kadar air., Inorganic fertilizer has deficiency that can damage soil so that solution is needed to reduce the use inorganic fertilizers with organic fertilizers. This study aims to see the response organic fertilizers, namely vermicompost and rabbit biourine to the growth and yield of lettuce. The study used factorial Randomized Complete Block Design (RCBD). The first factor is treatment of vermicompost (K), namely without kascing (K0) and with kascing (K1). The second factor is concentrations rabbit biourin, namely 0% (U0), 6% (U1), 9% (U2) and 12% (U3). Both factors were tested with two controls, namely without fertilizer (control -) and with NPK inorganic fertilizer (control+). The results showed that treatment of vermicompost was significantly different from all variable except moisture content, while treatment of biourine rabbits was significantly different only on the weight of roots. The interaction between vermicompost and rabbit biourin was significantly different on height 2 WAP and root weight of lettuce.
Keyword: inorganic, lettuce, organic, rabbit biourine, vermicompost

Judul: Pemanfaatan Limbah Ternak Sebagai Pupuk Cair Organik Untuk Meningkatkan Pertumbuhan Dan Produksi Selada (Lactuca Sativa Var. Crispa)
Abstrak: The research are to determine the effect of organic liquid fertilizer derived from manure and urine of cattle, urine of sheep, urine of rabbits and combination between of manure and urine on growth, production, physical quality and freshness of lettuce (Lactuca sativa var. crispa) and to find the best organic liquid fertilizer. The experiment was conducted in the Vegetable Garden, University Farm Cikabayan Bogor Agricultural University, Dramaga, Bogor (processing of organic liquid fertilizer and planting) in December 2010 until February 2011 and Postharvest treatment in the Laboratory of Production, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University in March 2011. The Method of this research is Randomize Complete Block Design with one factor. The treatment are kinds of organic liquid fertilizer with three replicates. The treatments are treatment without liquid fertilizer application (just water), liquid fertilizer from urine of cattle, liquid fertilizer from urine of sheep, liquid fertilizer urine of rabbit, liquid fertilizer from manure of cattle, liquid fertilizer from combination between manure and urine of cattle, liquid fertilizer from combination between manure of cattle and urine of sheep, liquid fertilizer from combination between manure of cattle and urine of rabbit. The results indicate that the liquid fertilizer does not significantly affect the growth, production, physical quality and freshness of lettuce. This means that, each treatment gives the same effect for all parameters.
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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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