Judul: Feasibility of The Hybrid Corn Seed Production Development PT Agricorn Putra Sejati Solok City
Abstrak: Upaya yang dapat dilakukan untuk pemenuhan pasokan jagung adalah dengan meningkatkan produktivitas menggunakan benih unggul seperti benih jagung hibrida. PT Agricorn Putra Sejati merupakan produsen benih jagung hibrida yang berencana untuk menambah kapasitas produksi. Penelitian ini bertujuan untuk mengetahui kelayakan pengembangan usaha dan menganalisis perubahan maksimum pada harga pupuk dan upah tenaga kerja tetap. Penelitian ini menggunakan skenario yaitu skenario I (kondisi tanpa pengembangan), skenario II (kondisi pengembangan dengan sistem padat karya), dan skenario III (kondisi pengembangan dengan lebih banyak menggunakan tenaga mesin). Penelitian ini menggunakan aspek non finansial (aspek pasar, aspek teknis, aspek manajemen dan hukum, aspek sosial, ekonomi, dan budaya, serta aspek lingkungan), aspek finansial (NPV, Net B/C, IRR, Payback Period), dan analisis nilai pengganti. Hasil penelitian menunjukkan perusahaan layak untuk dikembangkan dan akan memperoleh manfaat bersih lebih tinggi jika menggunakan skenario III. Berdasarkan analisis nilai pengganti, perusahaan lebih sensitif terhadap kenaikan upah tenaga kerja daripada kenaikan harga pupuk.
Keyword: seeds, investment, hybrid corn, feasbility, development

Judul: Peningkatan Produksi Benih Jagung Hibrida melalui Optimalisasi Populasi dan Rasio Tetua Jantan Betina
Abstrak: Attempts to increase seed yield of hybrid corn has been done, but the results have not been satisfactorily achieved. Researches should be done in various aspects such as row ratio of parents, planting density, optimum days to harvest and influence of climatic factors (sunlight and rainfall), season and agroecology. The aim of study are to obtain optimum plant population and rasio of male to female parents for increasing seed yield of hybrid corn and to study seed quality of Bima 3 and STJ-01 varieties. The seeds used in the research were parents of Bima 3 (Nei90008 line as female, Mr14 line as male) and STJ-01 (Bima 5 variety as female, Nei9008 line as male). The experiment was arranged in a randomized complete block design with two factors and three replications (replications was nested in factor of parent ratio). The first factor was male to female parent ratio (1:4, 1:5 and 2:6) and the second factor was plant population (66 667 plants/ha, 83 333 plants/ha and 90 000 plants/ha). Combined analysis of variance was performed to understand the effects of both factors and their interactions. The results showed that plant population did not significantly affect plant height of Bima 3 and STJ-01 parents, ear height of Bima 3 and STJ-01 female parents, leaf area index of STJ-01 female parent, number of ear of Bima 3 female parent, ear weight of Bima 3, and seed yield of Bima3 and STJ-01. The effect of parents ratio was significant for seed yield of Bima 3 and STJ-01. The highest seed yield of Bima 3 variety was achieved at parent ratio 1: 5 (1.43 tons/ha) and the highest seed yield of STJ-01 was achieved at parent ratio 1:4 (3 tons/ha). Seed quality of Bima 3 variety was better than that of STJ-01. The seedling growth of Bima 3 was more simultaneous more tolerant to drought based on germination percentage and speed of germination and more tolerant to salinity based on the number of green leaves.
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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