Judul: Pengaruh tingkat kemasakan benih dan periode simpan terhadap viabilitas dan vigor benih kacang bogor (Vigna subterranea (l). Verdc.) pada ruang simpan ac dan kamar
Abstrak: The objectives of these experiments were to study the effect of seed maturity level and storage period on seed viability and vigor of bambara gronmut (Vigna subterranea L.) stored either at air conditioned or ambient rooms.
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Judul: Pengaruh Perlakuan Invigorasi Pada Benih Yang Berbeda Tingkat Masak Terhadap Viabilitas Dan Vigor Benih, Pertumbuhan Tanaman, Dan Hasil Kacang Bogor (Vigna subterranea (L.) Verdcourt)
Abstrak: Bambara groundnut can be cultivated in marginal land, however, its productivity is low. In order to increase the productivity, high quality of seeds must be used. Two consecutive experiments were conducted in laboratory and field at Bogor Agricultural University from April to October 2010. Seeds of three maturity levels were harvested from farmer’s field in Sukabumi, April 2010. The seeds were dried down to 11.6% moisture content before being used. The objectives of the experiments were to evaluate effects of seed invigoration applied on bambara groundnut seeds of three maturity levels on seed vigor, plant growth, and yield. Laboratory experiment was arranged in a completely randomized design while field experiment was arranged in a completely randomized block design. In both experiments, two factors were applied, seed maturity and invigoration. There were three levels of seed maturity i.e. seeds harvested at 119, 122, and 125 days after planting (dap). Seed invigoration consisted of untreated, Rhizobium sp., matriconditioning, matriconditioning plus Rhizobium sp. Matriconditioning was conducted using ratio of seeds to carrier (burned rice hull) to water of 20:12:12 (g) for 3 days in air-conditioned room ca. 25 0C. Rhizobium sp. 0.3 g/100 g seeds was either applied on seeds just before planted or incorporated in matriconditioning. Results of the laboratory experiment showed that matriconditioning alone or matriconditioning plus Rhizobium sp. applied on seeds harvested at 122 daf or 125 dap improved seed vigor (speed of germination and index of vigor). However, there was no interaction occurred between the two factors in the field experiment. Seeds treated with matriconditioning plus Rhizobium sp. or harvested at 125 dap showed the best improvement in plant growth (plant height, number of leaves, number of branches) and yields (number and weight of pods).
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Judul: Invers Drazin dari Matriks Toeplitz Singular
Abstrak: Matriks Toeplitz adalah matriks yang setiap unsur pada diagonal utama bernilai sama dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga bernilai sama. Matriks singular adalah matriks yang tidak bisa ditentukan inversnya. Akan tetapi, dapat diupayakan untuk ditentukan inversnya menggunakan invers matriks yang diperumum. Invers Drazin merupakan salah satu jenis invers matriks yang diperumum. Pada karya ilmiah ini ditentukan invers Drazin dari matriks Toeplitz singular dengan menggunakan metode Leverrier Faddeev. Kemudian, ditentukan invers Drazin dari matriks Toeplitz singular yang direpresentasikan sebagai penjumlahan segitiga bawah dan segitiga atas matriks Toeplitz berdasar pada teorema Gohberg dan Semencul., Toeplitz matrix is a matrix in with element on the main diagonal has the same value and on the subdiagonal corresponding to the main diagonal also has the same value. Singular matrix is a matrix that has no inverse. However, it can be attempted to determine the inverse using a generalized inverse matrix. Inverse Drazin is a type of generalized matrix inverse. This paper discussed the inverse Drazin for a singular Toeplitz matrix using the Leverrier Faddeev method. Then, the Drazin inverse of the singular Toeplitz matrix which is represented as a sum of products of lower and upper triangular Toeplitz matrix based on Gohberg and Semencul theorem.
Keyword: inverse Drazine, singular Toeplitz matrix